## Congenital Heart Disease

**Definition/Overview**
Congenital heart disease (CHD) refers to structural or functional abnormalities of the heart and great vessels present at birth, arising from faulty cardiac embryogenesis. It is the most common congenital anomaly, affecting roughly 8-10 per 1000 live births, and ranges from trivial lesions discovered incidentally to complex anomalies incompatible with life without early surgery.

**Etiology / Causes**
Mostly multifactorial (genetic + environmental). Recognized associations include:
- Chromosomal/genetic: Down syndrome (AVSD, VSD), Turner syndrome (coarctation), DiGeorge syndrome (conotruncal defects), Marfan syndrome.
- Maternal factors: rubella infection (PDA, pulmonary stenosis), maternal diabetes, maternal phenylketonuria, maternal SLE (congenital heart block).
- Teratogens: alcohol (fetal alcohol syndrome), lithium, warfarin, anticonvulsants (phenytoin, valproate).
- Idiopathic/polygenic - majority of cases.

**Classification**
Broadly divided by presence of cyanosis:

A. Acyanotic (left-to-right shunt or obstructive):
- Shunt lesions: Ventricular septal defect (VSD, most common CHD), Atrial septal defect (ASD), Patent ductus arteriosus (PDA), Atrioventricular septal defect (AVSD).
- Obstructive lesions: Coarctation of aorta, Aortic stenosis, Pulmonary stenosis.

B. Cyanotic (right-to-left shunt / mixing):
- Tetralogy of Fallot (TOF) - VSD + pulmonary stenosis + RVH + overriding aorta - commonest cyanotic CHD.
- Transposition of the great arteries (TGA).
- Tricuspid atresia, Total anomalous pulmonary venous connection (TAPVC), Truncus arteriosus, Hypoplastic left heart syndrome, Ebstein anomaly.

**Clinical Features**
- Acyanotic: failure to thrive, recurrent chest infections, breathlessness on feeding, murmurs, cardiac failure.
- Cyanotic: central cyanosis, clubbing, squatting (in TOF - relieves hypercyanotic "Tet spells"), polycythemia, exertional dyspnea, growth retardation.
- Signs: precordial bulge, thrill, specific murmurs (e.g., continuous "machinery" murmur in PDA, harsh pansystolic murmur in VSD, ejection systolic murmur radiating to back in pulmonary stenosis), differential cyanosis, differential blood pressure in coarctation (weak/absent femoral pulses).

**Investigations**
Pulse oximetry (screening), chest X-ray (boot-shaped heart in TOF, egg-on-side in TGA, cardiomegaly with plethoric lung fields in shunt lesions), ECG, echocardiography (transthoracic +/- fetal echo - diagnostic gold standard), cardiac catheterization/angiography for hemodynamic assessment, CT/MRI angiography for complex anatomy, genetic screening if syndromic features present.

**Management**
- Medical: diuretics, ACE inhibitors, digoxin for heart failure; prostaglandin E1 infusion to keep ductus patent in duct-dependent lesions; prophylaxis against infective endocarditis; nutritional support; oxygen (cautiously in duct-dependent cyanotic lesions).
- Interventional (catheter-based): balloon atrial septostomy (TGA), device closure of ASD/VSD/PDA, balloon valvuloplasty.
- Surgical: timing depends on lesion severity.
  - Palliative: Blalock-Taussig shunt (systemic-to-pulmonary shunt in TOF/cyanotic lesions awaiting definitive repair), pulmonary artery banding.
  - Corrective: VSD/ASD closure (patch repair on cardiopulmonary bypass), total correction of TOF (VSD closure + relief of RVOT obstruction), arterial switch operation (TGA), Fontan procedure (single ventricle physiology), coarctation repair/resection with end-to-end anastomosis.
  - Heart transplantation for inoperable complex lesions.

**Complications**
Heart failure, pulmonary hypertension/Eisenmenger syndrome, infective endocarditis, arrhythmias, cerebral abscess/paradoxical embolism (right-to-left shunts), polycythemia and stroke risk, growth failure, post-surgical complications (residual shunt, arrhythmia, low cardiac output).

**Physiotherapy Relevance**
- Pre-operative: assess baseline respiratory status, teach diaphragmatic breathing and effective coughing, chest physiotherapy to clear secretions in infants with recurrent chest infections, parental education, optimize nutrition/positioning to reduce work of breathing, avoid strenuous activity if cyanotic/spell-prone.
- Post-operative (after sternotomy/CPB): early chest physiotherapy to prevent atelectasis and pneumonia; deep breathing exercises, incentive spirometry (in cooperative children), assisted coughing with sternal support/splinting; postural drainage and gentle percussion/vibration (avoid over sternotomy site initially); early mobilization as hemodynamically stable to prevent deconditioning and DVT; monitor for cyanosis, desaturation, and arrhythmia during treatment; sternal precautions (no pulling up by arms, no heavy lifting, log-roll technique) for 6 weeks; gradual, monitored return to activity with attention to exercise tolerance especially in single-ventricle/Fontan physiology; family education on activity restriction and recognizing decompensation; long-term cardiac rehabilitation to improve exercise capacity in children/adults with corrected CHD.

## Ischemic Heart Disease

**Definition/Overview**
Ischemic heart disease (IHD) is a condition where there is an imbalance between myocardial oxygen supply and demand, most commonly due to atherosclerotic narrowing of coronary arteries, leading to inadequate perfusion of the myocardium. It is a spectrum ranging from stable angina to acute myocardial infarction (MI) and sudden cardiac death.

**Etiology/Risk Factors**
- Modifiable: smoking, hypertension, dyslipidemia, diabetes mellitus, obesity, sedentary lifestyle, stress.
- Non-modifiable: age, male gender, family history, genetic predisposition.
- Underlying pathology: atherosclerotic plaque formation leading to progressive luminal narrowing, then plaque rupture with thrombosis causing acute coronary syndromes.

**Types/Classification**
- Stable angina - predictable exertional chest pain relieved by rest/nitrates.
- Unstable angina - rest pain, crescendo pattern, no myocardial necrosis.
- Acute Myocardial Infarction - STEMI (transmural, ST elevation) and NSTEMI (subendocardial).
- Silent ischemia - asymptomatic, common in diabetics.
- Sudden cardiac death - due to fatal arrhythmia from ischemia.

**Clinical Features**
Central crushing chest pain radiating to left arm/jaw, sweating, breathlessness, nausea, vomiting; pain may be exertional (angina) or at rest (unstable angina/MI); silent presentation in diabetics/elderly; signs of heart failure in complicated cases (crepitations, raised JVP, S3 gallop).

**Investigations**
ECG (ST depression/elevation, T inversion, Q waves), cardiac biomarkers (troponin I/T, CK-MB), lipid profile, echocardiography (regional wall motion abnormality, ejection fraction), exercise stress test, coronary angiography (gold standard for anatomy), CT coronary angiography, myocardial perfusion scan.

**Management**
- Medical: antiplatelets (aspirin, clopidogrel), statins, beta-blockers, nitrates, ACE inhibitors, anticoagulants in ACS, thrombolysis in STEMI where PCI unavailable, risk factor modification (smoking cessation, diet, exercise, glycemic control).
- Interventional: Percutaneous Coronary Intervention (PCI) with balloon angioplasty/stenting.
- Surgical: Coronary Artery Bypass Grafting (CABG) for multivessel/left main disease (see separate topic).

**Complications**
Arrhythmias (VF - commonest cause of pre-hospital death), cardiogenic shock, heart failure, papillary muscle rupture/mitral regurgitation, ventricular septal rupture, cardiac tamponade, ventricular aneurysm, mural thrombus with systemic embolism, Dressler's syndrome (post-MI pericarditis).

**Physiotherapy Relevance**
- Acute phase: bed rest initially, gentle passive/active limb exercises to prevent DVT, monitor vitals/ECG during any mobilization, avoid Valsalva maneuvers.
- Phase I cardiac rehabilitation (in-hospital): early, graded mobilization starting with sitting, standing, then walking as tolerated, breathing exercises, patient education on energy conservation and symptom recognition (chest pain, breathlessness, palpitations warrant stopping activity).
- Phase II (post-discharge, outpatient): structured, supervised aerobic exercise program with continuous risk stratification, target heart rate training, resistance training, education on risk factor modification.
- Phase III (long-term/community): maintenance exercise, lifestyle modification, ongoing monitoring.
- Precautions: avoid exercising during active angina, monitor for exertional dyspnea/arrhythmia, use Borg scale for exertion, avoid isometric/high-resistance exercises early, ensure emergency response readiness during rehab sessions.

## Coronary Heart Disease / CAD (Coronary Artery Disease)

**Definition/Overview**
Coronary Artery Disease (CAD), synonymous in practice with coronary heart disease, refers to narrowing or occlusion of coronary arteries due to atherosclerosis, reducing blood supply to the myocardium. It is the underlying pathological process for most ischemic heart disease presentations.

**Etiology/Risk Factors**
Same atherosclerotic risk factors as IHD: hypertension, smoking, diabetes, dyslipidemia (raised LDL, low HDL), obesity, physical inactivity, family history, age, male sex, chronic kidney disease, elevated homocysteine/CRP.

**Pathophysiology/Types**
- Fatty streak leading to fibrous plaque leading to complicated plaque with calcification/ulceration/thrombosis.
- Classified by vessel involvement: single-vessel, double-vessel, triple-vessel disease, and left main stem disease (most severe, high surgical priority).
- Distribution commonly involves LAD (left anterior descending), RCA (right coronary artery), LCx (left circumflex).

**Clinical Features**
May be asymptomatic for years; angina pectoris (typical exertional, retrosternal, relieved by rest/GTN); atypical presentations in women/diabetics/elderly (fatigue, dyspnea, epigastric discomfort); progression to ACS/MI; heart failure symptoms in advanced disease.

**Investigations**
Resting/exercise ECG, echocardiogram, coronary CT angiography (calcium scoring), invasive coronary angiography (defines % stenosis and lesion anatomy - gold standard), stress myocardial perfusion imaging, blood lipid profile, HbA1c.

**Management**
- Risk stratification determines pathway: low risk - medical therapy and lifestyle change; high risk (left main, triple vessel, reduced LV function, diabetic) - revascularization.
- Medical: statins, antiplatelets, antianginals (beta-blockers, calcium channel blockers, nitrates), ACE inhibitors, aggressive risk factor control.
- Revascularization: PCI with drug-eluting stents for focal/single or double-vessel disease; CABG preferred for left main stem disease, triple-vessel disease, diabetics with multivessel disease, or when PCI is not anatomically feasible (SYNTAX score guides choice).

**Complications**
Progression to unstable angina/MI, heart failure, arrhythmia including sudden death, complications of revascularization (restenosis, stent thrombosis, graft occlusion).

**Physiotherapy Relevance**
- Primary and secondary prevention role: structured aerobic exercise training improves endothelial function and collateral circulation, and is a cornerstone of cardiac rehabilitation.
- Pre-procedure (before PCI/CABG): assess functional capacity, teach deep breathing/coughing techniques to be used post-operatively, patient education to reduce anxiety.
- Post-procedure: as per CABG/PCI protocols - early mobilization, monitored graded exercise, monitoring for angina/arrhythmia during activity, use of the Borg Rate of Perceived Exertion scale, home exercise prescription, and long-term lifestyle counselling (smoking cessation, weight management, diet) integrated into rehab sessions.
- Physiotherapists play a key role in outpatient cardiac rehabilitation programs, improving exercise tolerance, reducing recurrence risk, and improving quality of life.

## Thoracotomy

**Definition/Overview**
Thoracotomy is a surgical incision into the chest wall to gain access to the thoracic cavity (lungs, heart, esophagus, great vessels, mediastinum) for diagnostic or therapeutic purposes. It remains a major approach despite the rise of minimally invasive (VATS) techniques, especially for complex or bulky resections.

**Indications**
Lung resections (lobectomy, pneumonectomy, segmentectomy), decortication/empyema drainage, esophageal surgery, cardiac surgery (rarely via anterolateral thoracotomy), thoracic trauma (hemothorax, cardiac tamponade), pleural disease, mediastinal tumors, lung/pleural biopsy where VATS is not feasible.

**Types/Classification**
- Posterolateral thoracotomy - most common, gold-standard for major lung resections; wide exposure, divides latissimus dorsi +/- serratus anterior.
- Anterolateral thoracotomy - used in trauma/emergency access, cardiac tamponade, some cardiac procedures; less muscle division, faster.
- Axillary (muscle-sparing) thoracotomy - preserves major muscles, cosmetically better, used for smaller procedures like sympathectomy, bullectomy.
- Median sternotomy - technically a separate approach used for cardiac surgery (discussed under CPB/CABG).
- Clamshell (bilateral anterior) thoracotomy - for bilateral lung transplantation, some mediastinal tumors.

**Surgical Technique (brief)**
Patient positioned laterally (for posterolateral) with the affected side up; incision along the line of a rib (commonly 5th intercostal space); latissimus dorsi and serratus anterior divided/spared depending on type; intercostal muscles divided; pleura opened; rib spreader used to gain access; procedure performed; chest drains (usually two - basal and apical) inserted before closure; ribs approximated with pericostal sutures; layered closure of muscle, subcutaneous tissue, and skin.

**Complications**
Post-thoracotomy pain syndrome (due to intercostal nerve damage - common and significant), atelectasis and pneumonia (due to pain-limited breathing), wound infection, hemothorax/bleeding, air leak/persistent pneumothorax, injury to intercostal vessels/nerves, arrhythmias (especially atrial fibrillation), reduced shoulder mobility/winging of scapula (if serratus anterior/long thoracic nerve affected).

**Physiotherapy Relevance**
- Pre-operative: assessment of respiratory function (spirometry), teaching deep breathing exercises, effective coughing/huffing techniques, incentive spirometry, and general conditioning; patient education about the post-op physiotherapy program reduces anxiety and improves compliance.
- Post-operative:
  - Adequate analgesia (epidural/PCA) is essential before starting chest physiotherapy - pain control directly determines effectiveness.
  - Deep breathing exercises (thoracic expansion exercises, especially to the operated side to prevent basal atelectasis), incentive spirometry.
  - Assisted/huffed coughing with wound support (manual splinting over incision) to clear secretions without excessive pain.
  - Postural drainage, percussion, and vibrations as tolerated (avoiding directly over the incision/drain sites).
  - Early mobilization (sitting out of bed on day 1, walking as early as possible) to reduce risk of atelectasis, pneumonia, and DVT.
  - Shoulder and thoracic range-of-motion exercises to prevent stiffness/frozen shoulder from muscle division and positioning during surgery.
  - Chest drain management - physiotherapy continues with drains in situ; monitor drain swing and output; avoid kinking tubing during mobilization.
  - Monitor for signs of surgical emphysema, pneumothorax recurrence, or excessive air leak during treatment.
  - Long-term: postural correction, scar mobilization, and continued exercises for post-thoracotomy pain syndrome and scapular winging if present.

## Lobectomy

**Definition/Overview**
Lobectomy is the surgical resection of one lobe of the lung. It is the most common operation for lung cancer and is considered the gold-standard oncological resection when disease is confined to a single lobe with adequate cardiopulmonary reserve.

**Indications**
- Primary lung carcinoma confined to one lobe (most common indication).
- Localized bronchiectasis.
- Lung abscess not responding to medical treatment.
- Benign tumors (hamartoma) not amenable to smaller resection.
- Tuberculous destroyed lobe, fungal ball (aspergilloma), severe localized trauma/hemorrhage, congenital lobar emphysema/cystic lung disease.

**Types/Approaches**
- Open lobectomy via posterolateral thoracotomy.
- Video-Assisted Thoracoscopic Surgery (VATS) lobectomy - minimally invasive, reduced pain and hospital stay.
- Robotic-assisted lobectomy.
- Sleeve lobectomy - lobectomy with bronchial sleeve resection and reanastomosis to preserve additional lung tissue, avoiding pneumonectomy in centrally located tumors.

**Pre-operative Assessment**
Pulmonary function tests (FEV1, DLCO) to predict post-operative respiratory reserve, cardiopulmonary exercise testing in borderline cases, staging investigations for malignancy (CT chest, PET-CT, mediastinoscopy/EBUS for nodal staging), assessment of comorbidities and smoking cessation counseling.

**Surgical Procedure (brief)**
General anesthesia with double-lumen endotracheal tube (allows single-lung ventilation); thoracotomy or VATS ports; identification and individual ligation/division of the lobar pulmonary artery branch, pulmonary vein, and bronchus; lobe removed; bronchial stump tested for air leak and reinforced; mediastinal/hilar lymph node dissection performed for staging in cancer cases; chest drains inserted; lung re-expanded and chest closed.

**Complications**
Air leak/prolonged bronchopleural fistula, hemorrhage, atelectasis, pneumonia, arrhythmias (especially AF), respiratory failure, empyema, wound infection, post-thoracotomy pain, reduced exercise tolerance, rarely bronchial stump dehiscence.

**Physiotherapy Relevance**
- Pre-operative: optimize lung function - smoking cessation, incentive spirometry training, teaching diaphragmatic breathing, airway clearance techniques, and general aerobic conditioning to improve reserve and reduce post-op complications.
- Post-operative:
  - Early and aggressive chest physiotherapy is critical since remaining lung tissue must compensate for the resected lobe.
  - Deep breathing exercises and incentive spirometry to prevent atelectasis in the remaining lobes.
  - Effective, supported coughing/huffing to clear secretions; humidification/nebulization if secretions thick.
  - Early mobilization (within 24 hours) to promote full lung expansion and reduce complications.
  - Positioning to optimize ventilation-perfusion matching (avoid prolonged lying on operated side if it worsens saturation, though positioning is individualized).
  - Shoulder and trunk mobility exercises to prevent stiffness.
  - Monitor chest drain output/air leak; use of physiotherapy techniques to encourage lung re-expansion aids earlier drain removal.
  - Watch for signs of respiratory distress, subcutaneous emphysema, and desaturation during treatment.
  - Gradual return to functional activity and pulmonary rehabilitation for long-term exercise tolerance, particularly important in patients with reduced pulmonary reserve.

## Pleurodesis / Pleurectomy

**Definition/Overview**
Pleurodesis is a procedure that artificially obliterates the pleural space by inducing adhesion/fibrosis between the parietal and visceral pleura, preventing recurrent pleural effusion or pneumothorax. Pleurectomy is surgical stripping/excision of the parietal pleura (and sometimes part of the visceral pleura) to achieve the same goal mechanically, or as part of oncological resection (e.g., mesothelioma surgery).

**Indications**
- Recurrent/refractory malignant pleural effusion.
- Recurrent spontaneous pneumothorax (especially second ipsilateral episode or first contralateral episode, or in high-risk occupations e.g., pilots, divers).
- Persistent air leak/bronchopleural fistula.
- Malignant pleural mesothelioma (pleurectomy/decortication as part of cytoreductive surgery).
- Chylothorax refractory to conservative management.

**Types/Methods**
- Chemical pleurodesis: sclerosing agent instilled via chest tube - talc (most effective/commonly used), tetracycline/doxycycline, bleomycin.
- Mechanical pleurodesis (surgical/abrasion): pleural abrasion performed via thoracotomy or VATS using dry gauze/mesh to abrade parietal pleura.
- Surgical pleurectomy: parietal pleurectomy via VATS or thoracotomy; more effective and durable than chemical pleurodesis but more invasive.
- Talc poudrage: talc insufflated as a fine spray during thoracoscopy.

**Procedure (brief)**
Chest tube inserted to fully drain effusion/pneumothorax and ensure full lung re-expansion (essential prerequisite - pleurodesis fails if lung is not fully expanded); sclerosant instilled through the drain and drain clamped for a period, or pleural abrasion/pleurectomy performed thoracoscopically; drain kept until drainage minimal and lung fully expanded on imaging.

**Complications**
Pain (can be severe, especially with talc), fever, empyema, ARDS (rare but serious complication of talc pleurodesis), failure of pleurodesis with recurrence, bleeding, prolonged air leak.

**Physiotherapy Relevance**
- Pre-procedure: baseline respiratory assessment; explain the importance of deep breathing and mobilization in ensuring successful lung apposition to the chest wall.
- Post-procedure:
  - Encourage deep breathing exercises and full thoracic expansion - essential for successful adhesion formation between pleural surfaces.
  - Early mobilization and position changes to promote lung re-expansion and even distribution of sclerosant (with chemical pleurodesis) and reduce atelectasis.
  - Effective coughing techniques to clear secretions, but with wound/drain support to minimize pain.
  - Pain management coordination - as pleurodesis/pleurectomy can be very painful, ensure adequate analgesia before chest physiotherapy sessions to allow effective deep breathing.
  - Monitor chest drain function/swinging and volume; report failure of lung to re-expand.
  - Post pleurectomy (more extensive surgery), physiotherapy follows thoracotomy protocol - shoulder ROM exercises, scar mobilization, graded return to activity.
  - Educate patient regarding avoiding activities that might cause rapid pressure changes (e.g., air travel, diving) especially after pneumothorax management.

## Segmentectomy

**Definition/Overview**
Segmentectomy is the anatomical resection of one or more bronchopulmonary segments of a lung lobe, along with their corresponding segmental artery, vein, and bronchus, while preserving the remaining lung parenchyma. It is a lung-parenchyma-sparing alternative to lobectomy.

**Indications**
- Small (typically <=2 cm), peripherally located, early-stage (Stage I) non-small cell lung cancer, particularly in patients with limited pulmonary reserve who cannot tolerate lobectomy.
- Localized benign disease (e.g., bronchiectasis, aspergilloma, tuberculous lesions) confined to a segment.
- Metastatic nodules requiring limited resection with margin.
- Patients with compromised lung function (COPD, poor FEV1/DLCO) where lobectomy risk is prohibitive.

**Types/Approach**
- Anatomical segmentectomy (individual ligation of segmental vessels/bronchus - oncologically preferred) vs. wedge resection (non-anatomical, wider margins not guaranteed).
- Can be performed via open thoracotomy, VATS, or robotic-assisted approach.
- Common examples: lingular segmentectomy, superior/basal segmentectomy of lower lobes.

**Surgical Procedure (brief)**
Single-lung ventilation with double-lumen tube; identification of the intersegmental plane (often using the "inflation-deflation" technique or intravenous indocyanine green); individual dissection and division of the segmental bronchus, artery, and vein; parenchymal division along the intersegmental plane with staplers; margin and lymph node sampling; chest drain placement; lung re-expansion.

**Complications**
Prolonged air leak (higher risk than lobectomy due to larger raw parenchymal surface), atelectasis, hemorrhage, incomplete oncological margins (theoretical concern vs. lobectomy), pneumonia, arrhythmia.

**Physiotherapy Relevance**
- Pre-operative: similar to lobectomy - pulmonary function optimization, smoking cessation, incentive spirometry training, and patient education, particularly important since these patients often have borderline lung reserve to begin with.
- Post-operative:
  - Vigilant chest physiotherapy is especially crucial as segmentectomy patients often have limited pulmonary reserve (COPD, etc.) - even small degrees of atelectasis are poorly tolerated.
  - Deep breathing exercises, incentive spirometry, and thoracic expansion exercises to re-expand the remaining segments and lobe.
  - Gentle, supported coughing/huffing for secretion clearance.
  - Early mobilization tailored to patient's baseline functional capacity (may need slower progression given comorbid respiratory disease).
  - Close monitoring for prolonged air leak - physiotherapy may need modification (avoid excessive positive pressure techniques) in consultation with the surgical team if air leak is significant.
  - Oxygen saturation monitoring during treatment given reduced reserve.
  - Pulmonary rehabilitation post-discharge to maximize functional capacity given compromised baseline lung function.

## Decortication (of Lung)

**Definition/Overview**
Decortication is a surgical procedure to remove the thickened fibrous pleural peel (cortex) that has formed over the visceral and/or parietal pleura, typically as a sequela of organized empyema, hemothorax, or chronic pleural inflammation, which is restricting lung expansion ("trapped lung"). Decortication is indicated when the lung fails to re-expand after simple drainage of an empyema.

**Indications**
- Chronic empyema with trapped/entrapped lung causing restrictive respiratory impairment.
- Organized hemothorax not resolved by drainage/fibrinolytics.
- Fibrothorax following tuberculosis, chronic infection, or hemothorax.
- Persistent pleural thickening causing significant restrictive lung disease on imaging (CT showing thickened pleura).

**Investigations**
Chest X-ray and contrast CT chest (demonstrates pleural thickening/loculated collection and degree of lung entrapment), pulmonary function tests (restrictive pattern), pleural fluid analysis if effusion present, assessment of underlying cause (TB workup, culture of empyema fluid).

**Surgical Procedure**
Performed via posterolateral thoracotomy (standard) or, in selected/early cases, via VATS. The fibrous cortex/peel overlying the visceral pleura (and parietal pleura if involved) is carefully dissected and stripped away, allowing the underlying lung to re-expand and obliterate the pleural space. Meticulous technique is required to avoid damaging the underlying visceral pleura/lung parenchyma, which would cause air leak. Well-positioned chest drains are placed at the end for dependent drainage, and the lung is encouraged to fully re-expand before drains are removed.

**Complications**
Prolonged air leak (from lung parenchymal injury during dissection), bleeding (raw, vascular decorticated surface), residual pleural space/recurrent empyema, respiratory failure if underlying lung is chronically damaged, wound infection, incomplete re-expansion.

**Physiotherapy Relevance**
- Pre-operative: assess degree of respiratory compromise, teach breathing exercises and coughing techniques the patient will use post-operatively, optimize nutrition (chronic empyema patients often debilitated/septic).
- Post-operative (one of the most physiotherapy-dependent thoracic procedures):
  - Aggressive chest physiotherapy is essential and directly determines success - the whole aim of decortication is to allow full lung re-expansion, and physiotherapy actively drives this process.
  - Vigorous deep breathing exercises, incentive spirometry, and thoracic expansion exercises performed frequently through the day.
  - Adequate analgesia (PCA/epidural) prioritized to allow effective, pain-free deep breathing - pain control is emphasized as it directly enables physiotherapy effectiveness.
  - Supported coughing/huffing to clear secretions and residual infected material.
  - Early mobilization to promote lung expansion and prevent further pleural space collapse.
  - Positioning to encourage expansion of the previously entrapped lung region.
  - Close monitoring of chest drains - physiotherapy continues until drains show minimal output and full lung expansion is confirmed radiologically, guiding the timing of drain removal.
  - Monitor for air leak, fever (residual infection), and desaturation.
  - Shoulder/scapular mobility exercises post-thoracotomy; long-term pulmonary rehabilitation to maximize functional recovery, especially if underlying lung was chronically diseased.

## Thoracoplasty

**Definition/Overview**
Thoracoplasty is a surgical procedure involving resection of a variable number of ribs (and sometimes the collapse/mobilization of the chest wall) to reduce the volume of the thoracic cavity, thereby permanently collapsing the underlying lung or obliterating a persistent pleural space/cavity. Historically it was the mainstay surgical treatment for pulmonary tuberculosis in the pre-antibiotic era; today it is reserved for select complex cases.

**Indications (Modern)**
- Chronic empyema with persistent pleural space that cannot be obliterated by decortication alone (especially when the underlying lung cannot re-expand, e.g., destroyed/fibrotic lung).
- Post-pneumonectomy empyema/residual space with bronchopleural fistula.
- Chronic tuberculous cavities not responsive to medical therapy (historic indication, now rare given effective anti-TB chemotherapy).
- Adjunct to obliterate space following extrapleural pneumonectomy for mesothelioma in select cases.

**Types**
- Classic (Extraperiosteal) thoracoplasty - sequential resection of multiple ribs (often 5-8 ribs) in stages to allow the chest wall to collapse inward onto the underlying diseased/collapsed lung, permanently reducing thoracic volume.
- Modified/limited thoracoplasty - fewer ribs resected, often combined with muscle flap transposition to fill residual space.
- Often combined with myoplasty (transposition of latissimus dorsi, pectoralis major, or serratus anterior muscle flaps) to obliterate residual pleural space - a more modern refinement.

**Surgical Procedure (brief)**
Performed under general anesthesia, typically staged (multiple ribs removed in one or more operative sessions to allow gradual chest wall collapse and reduce cardiorespiratory strain); posterolateral incision; subperiosteal resection of the selected ribs; chest wall allowed to sink inward, obliterating the underlying pleural space; muscle flaps may be mobilized and packed into any residual cavity; drains placed as needed.

**Complications**
Significant chest wall deformity and cosmetic disfigurement, scoliosis, paradoxical chest wall movement, reduced pulmonary function due to loss of thoracic volume/restrictive defect, chronic pain, winged scapula, respiratory insufficiency (in patients with already compromised lung function), wound infection.

**Physiotherapy Relevance**
- Pre-operative: thorough respiratory assessment given already-compromised lung status in most candidates; teach breathing exercises and secretion clearance techniques.
- Post-operative:
  - Physiotherapy is vital in preventing the marked restrictive respiratory impairment and chest wall stiffness that follows extensive rib resection.
  - Deep breathing exercises and incentive spirometry to maximize function of the remaining/contralateral lung.
  - Careful, graded thoracic and shoulder mobility exercises to prevent severe postural deformity, scoliosis progression, and frozen shoulder - balanced against need to allow the chest wall to settle/collapse as intended.
  - Postural correction and scapular stabilization exercises to counter the asymmetry created by rib resection and muscle flap transposition.
  - Supported coughing techniques for secretion clearance, especially important given reduced cough efficiency from chest wall instability.
  - Early, gentle mobilization respecting surgical precautions regarding the operated side (avoid excessive strain on the collapsed chest wall region in the immediate post-op period).
  - Long-term pulmonary rehabilitation to optimize functional capacity, given the permanent restrictive defect.
  - Monitor for paradoxical respiration and respiratory distress, particularly in the early post-operative period.

## CPB Machine (Cardiopulmonary Bypass Machine)

**Definition/Overview**
The cardiopulmonary bypass (CPB) machine, or "heart-lung machine," is a device that temporarily takes over the function of the heart and lungs during cardiac surgery, allowing the heart to be stopped, opened, and operated upon in a bloodless, motionless field while systemic circulation and gas exchange are maintained artificially. It was first used successfully by John Gibbon in 1953, revolutionizing cardiac surgery by enabling direct-vision intracardiac procedures.

**Indications/Uses**
- Any cardiac procedure requiring the heart and lungs to be stopped: valve surgery, CABG, congenital heart defect repair, aortic surgery, heart/lung transplantation.
- Other uses: adjunct in massive pulmonary embolectomy, rewarming in severe accidental hypothermia, resuscitation in severe respiratory failure (ECMO-related application), select non-cardiac procedures involving highly vascular tumors or great vessel invasion (e.g., IVC tumor thrombus in renal cell carcinoma).

**Components and Working Principle**
1. Venous cannulation/drainage: deoxygenated blood drains from the right atrium/great veins via gravity siphon (or vacuum-assist) into a venous reservoir.
2. Oxygenator: blood is oxygenated and CO2 removed - historically via "bubble" oxygenators (oxygen bubbled through blood), now almost universally via membrane oxygenators, which expose blood to oxygen across a thin membrane, minimizing blood trauma.
3. Heat exchanger: blood temperature is regulated (cooled during bypass to reduce metabolic demand, then rewarmed before weaning off bypass).
4. Arterial pump: typically a roller pump or centrifugal pump propels oxygenated blood back to the patient; flow rate is adjustable.
5. Arterial filter: a fine mesh filter (20-30 micron pore size) removes microemboli/debris before blood re-enters the patient.
6. Arterial cannulation: oxygenated blood is returned usually via a cannula in the ascending aorta (occasionally femoral artery).
7. Cardiotomy suction/reservoir collects field blood for recirculation; a cardioplegia delivery system infuses a potassium-rich solution into the coronary circulation to arrest the heart electromechanically and protect the myocardium during cross-clamping.

**Procedure Steps (brief)**
Full systemic heparinization before cannulation; aortic and venous cannulation; initiation of bypass with gradual transfer of circulatory function to the machine; aortic cross-clamp applied and cardioplegia given to arrest the heart; surgery performed in the still, bloodless field; after repair, cross-clamp released, heart re-perfused and rewarmed, de-aired, and weaned off bypass; decannulation; heparin reversed with protamine sulfate.

**Complications of CPB**
Coagulopathy (from hemodilution and platelet dysfunction), infection, air embolism, gastrointestinal complications (bowel/liver ischemia, pancreatitis), microembolization (affecting brain/eyes), myocardial depression/stunning, neurological dysfunction (stroke, post-perfusion cognitive syndrome/"pump head"), postcardiotomy syndrome (Dressler's-like pericardial inflammation), pulmonary injury ("pump lung," capillary leak), systemic inflammatory response/organ dysfunction, vascular injury at cannulation sites.

**Physiotherapy Relevance**
- Physiotherapists must understand CPB because most cardiac surgery patients they treat post-operatively have undergone bypass, which has systemic effects beyond the cardiac procedure itself.
- Anticipate and screen for post-perfusion pulmonary complications (atelectasis, pleural effusion, "pump lung") - chest physiotherapy (deep breathing, incentive spirometry, supported coughing) is started early to counter this.
- Monitor for neurological changes (subtle cognitive dysfunction, stroke signs) which may affect rehabilitation approach and safety during mobilization.
- Be alert to bleeding tendency/coagulopathy - care with manual chest physiotherapy techniques (percussion/vibration) in the early post-op period; liaise with surgical team regarding drain output.
- Sternal precautions apply (median sternotomy access is standard for CPB cases) - avoid pulling on arms, heavy lifting, or excessive shoulder abduction/pushing for ~6 weeks; use "log-rolling" for bed mobility.
- Early progressive mobilization protocol (sitting, standing, walking within 24-48 hours if stable) to reduce deconditioning, atelectasis, and thromboembolism risk, while monitoring hemodynamic stability, rhythm, and wound/drain status closely.
- Patient education regarding fatigue, gradual return to activity, and recognizing signs of complications (fever, wound issues, breathlessness) given the systemic physiological stress of CPB.

## Cardiac Surgery / CABG (Coronary Artery Bypass Grafting)

**Definition/Overview**
CABG is a surgical revascularization procedure in which a conduit (graft) is used to bypass a stenosed or occluded coronary artery, restoring blood flow to the ischemic myocardium distal to the blockage. It remains the gold-standard surgical treatment for significant coronary artery disease not amenable to, or better served surgically than, percutaneous intervention.

**Indications**
- Left main coronary artery stenosis (>50%).
- Triple-vessel (three-vessel) coronary disease, especially with reduced LV function.
- Multivessel disease in diabetic patients (shown to have superior outcomes with CABG vs. PCI).
- Double-vessel disease involving the proximal LAD.
- Failed PCI or unsuitable coronary anatomy for stenting.
- CAD with mechanical complications (e.g., concurrent valve disease, ventricular aneurysm) requiring combined surgery.

**History (brief)**
Early attempts (pre-1950s) at indirect revascularization via pericardial/omental adhesions had limited success. From the 1960s, aortocoronary saphenous vein grafts and internal thoracic (mammary) artery grafts became established. By the 1970s, large randomized trials confirmed survival benefit for high-risk subgroups. Although PCI (with modern drug-eluting stents) has changed referral patterns, multiple randomized trials confirm CABG remains the gold-standard for left main disease, triple-vessel disease, diabetics, and high-risk patients.

**Conduits Used**
- Left internal thoracic (mammary) artery (LIMA) - gold standard graft, especially to LAD, due to superior long-term patency.
- Right internal thoracic artery, radial artery - arterial conduits with good long-term patency.
- Great saphenous vein - most commonly used venous conduit, though lower long-term patency than arterial grafts.

**Surgical Procedure (brief)**
- Access via median sternotomy (standard) or minimally invasive approaches (MIDCAB, robotic).
- Conventional "on-pump" CABG: performed using cardiopulmonary bypass with cardioplegic arrest of the heart, allowing a still, bloodless field for precise anastomosis.
- "Off-pump" CABG (OPCAB): performed on the beating heart using mechanical stabilizers, avoiding CPB-related complications, in selected patients/centers.
- Harvest of graft conduit(s) (LIMA taken from chest wall; saphenous vein/radial artery harvested from leg/arm - increasingly via endoscopic/minimally invasive harvesting).
- Proximal and distal anastomoses fashioned to connect the graft from the aorta (or as a pedicled LIMA graft) to the coronary artery beyond the blockage.
- Weaning from bypass, hemostasis, chest drain placement, sternal wire closure.

**Complications**
Perioperative MI, arrhythmias (especially post-op atrial fibrillation - very common), bleeding/re-exploration for hemorrhage, sternal wound infection/mediastinitis (higher risk in diabetics, obese, bilateral IMA harvest), graft occlusion/failure, stroke, renal dysfunction, post-perfusion/CPB-related complications, pleural effusion, post-pericardiotomy syndrome, leg wound complications (if vein harvested), post-operative cognitive dysfunction, chronic post-sternotomy pain.

**Physiotherapy Relevance**
- Pre-operative ("prehabilitation"): baseline respiratory and functional assessment; teaching deep breathing exercises, incentive spirometry, effective coughing/splinting techniques, and ankle pumping exercises the patient will use immediately post-op; patient/family education regarding sternal precautions and the post-op recovery pathway reduces anxiety and improves compliance; smoking cessation counseling.
- Post-operative:
  - Early chest physiotherapy (from day 1) - deep breathing exercises, incentive spirometry, thoracic expansion exercises to prevent atelectasis, which is very common after sternotomy and CPB.
  - Supported/splinted coughing (using a pillow or folded towel against the sternum) to protect the healing sternotomy while clearing secretions.
  - Early progressive mobilization: sitting out of bed day 1, standing/walking short distances as early as day 1-2 if hemodynamically stable, progressing daily - crucial to reduce atelectasis, pneumonia, DVT, and deconditioning.
  - Strict sternal precautions for ~6-8 weeks: no lifting >2-5 kg, no pushing/pulling heavy objects, avoid bilateral shoulder abduction beyond 90 degrees, no driving, use of log-rolling technique for getting in/out of bed, and use of arms to assist minimally when rising from a chair.
  - Leg exercises and mobilization important if the saphenous vein was harvested, to prevent DVT and address leg swelling/wound issues.
  - Monitor vital signs, ECG rhythm, and wound/drain status continuously during physiotherapy sessions; watch for signs of post-op AF, which may require modifying the mobilization plan.
  - Shoulder and upper limb range-of-motion exercises to prevent stiffness, avoiding excessive strain on the sternum.
  - Structured Phase I (inpatient) followed by Phase II/III outpatient cardiac rehabilitation exercise programs to restore functional capacity, improve quality of life, and reduce future cardiac risk - physiotherapists are central to delivering this multidisciplinary rehabilitation.

## Organ Transplantation (Heart Transplant, as Representative Example)

**Definition/Overview**
Organ transplantation is the surgical replacement of a diseased or failing organ with a healthy organ from a donor (deceased or, for some organs, living). Heart transplantation is used here as a representative solid-organ transplant to illustrate general principles; similar principles of donor selection, immunosuppression, rejection surveillance, and physiotherapy-led rehabilitation apply broadly to other solid organ transplants (lung, liver, kidney), with organ-specific variations.

**Indications for Heart Transplant**
End-stage heart failure (NYHA Class III-IV) refractory to maximal medical therapy and unsuitable for other surgical options, including: dilated/ischemic cardiomyopathy, complex congenital heart disease not amenable to repair, refractory life-threatening arrhythmias, and select restrictive cardiomyopathies.

**Contraindications (general principles)**
Active malignancy, active infection, severe irreversible pulmonary hypertension, severe multi-organ dysfunction, active substance abuse, significant psychosocial factors likely to affect compliance, advanced age (relative), severe peripheral/cerebrovascular disease.

**Pre-transplant Evaluation**
Comprehensive cardiac assessment (echocardiography, right heart catheterization to assess pulmonary vascular resistance), screening for malignancy and infection, blood group and HLA/panel-reactive antibody typing, psychosocial evaluation, assessment of other organ function (renal, hepatic), and listing on a transplant waiting list according to urgency (often supported by mechanical circulatory support such as an LVAD as a "bridge to transplant" while waiting).

**Surgical Procedure (brief)**
Recipient placed on cardiopulmonary bypass; diseased heart excised, typically preserving the recipient's posterior atrial cuffs (bicaval or biatrial technique); donor heart (procured with cold cardioplegic preservation and cold ischemia time minimized, ideally <4 hours) is anastomosed - left atrium, then great vessels (aorta, pulmonary artery), then right atrium/cavae; heart de-aired and reperfused; weaning from bypass once graft function adequate; temporary epicardial pacing wires placed (donor heart is denervated and may need pacing support initially).

**Post-transplant Management**
Lifelong immunosuppression (typically triple therapy: calcineurin inhibitor e.g., tacrolimus/cyclosporine + antiproliferative agent e.g., mycophenolate + corticosteroids), regular surveillance endomyocardial biopsies to detect rejection, prophylaxis against opportunistic infections (CMV, PJP), close monitoring for cardiac allograft vasculopathy (a form of chronic rejection).

**Complications**
- Early: primary graft dysfunction, hyperacute/acute rejection, right ventricular failure (due to donor heart facing recipient's pulmonary vascular resistance), arrhythmia (denervated heart lacks vagal tone - resting tachycardia is typical), infection (immunosuppression), bleeding, renal dysfunction (calcineurin inhibitor nephrotoxicity).
- Late: chronic rejection/cardiac allograft vasculopathy, malignancy (immunosuppression-related, e.g., post-transplant lymphoproliferative disease), steroid-related complications (osteoporosis, diabetes, myopathy), infections.

**Physiotherapy Relevance**
- Pre-transplant: physiotherapy focuses on optimizing functional capacity despite severe heart failure - supervised, closely monitored low-level exercise programs (often while awaiting transplant, sometimes on mechanical support/LVAD), breathing exercises, and education about the transplant process and expected post-op rehabilitation.
- Post-operative (early):
  - Chest physiotherapy following sternotomy principles (as in CABG/CPB) - deep breathing exercises, incentive spirometry, supported coughing, early mobilization.
  - Sternal precautions for ~6-8 weeks as with any median sternotomy.
  - Awareness that the transplanted heart is denervated - patient will not experience typical anginal warning signs of ischemia/rejection, and heart rate response to exercise is blunted (no vagal tone, relies on circulating catecholamines) - exercise intensity should be guided by perceived exertion (Borg scale) rather than target heart rate initially, with gradual, closely monitored progression.
  - Strict infection control precautions during physiotherapy sessions (hand hygiene, PPE) due to immunosuppression - avoid treating patients with active infections in the same session/equipment.
  - Monitor for signs of rejection (fatigue, arrhythmia, hypotension, fever) and report promptly, as these may masquerade as simple deconditioning.
  - Long-term: structured cardiac rehabilitation exercise program to improve exercise tolerance, muscle strength (often deconditioned from pre-transplant illness and steroid myopathy), and quality of life; monitor bone health (steroid-induced osteoporosis) with appropriate weight-bearing exercise; lifelong graded activity promotion balanced against immunosuppression-related fatigue and infection risk.
- General principle across organ transplants: pre-habilitation to optimize functional status while awaiting transplant, early post-operative mobilization and chest physiotherapy (especially crucial for lung transplant recipients), infection precautions due to immunosuppression, monitoring for rejection/graft dysfunction signs, and structured long-term rehabilitation to restore functional independence and quality of life.