• Anatomy & Physiology - structures, functions, pathways
• Pathology & Pharmacology - disease mechanisms, drug actions
• Clinical conditions - musculoskeletal, neurological, cardiopulmonary, pediatric, etc.
• Assessment & Treatment techniques - manual therapy, electrotherapy, therapeutic exercises
• Case studies & clinical reasoning
• Exam prep - short notes, MCQs, important topics

• "Explain stroke rehabilitation"
• "Short notes on COPD"
• "Important topics in orthopedics for BPT exams"

• Definition (if applicable)
• Classification (if applicable)
• Etiology / Causes
• Pathophysiology
• Clinical Features (Signs & Symptoms)
• Diagnosis / Investigations
• Management (Medical + Surgical + Physiotherapy where relevant)
• Complications
• Prognosis

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Normal Anatomy of the Heart

1. Introduction

• Size: Approximately the size of a clenched fist
• Weight: ~250-350 g (adult)
• Position: Obliquely placed - base above (posteriorly), apex below (inferiorly and to the left)
• Apex beat: Felt at the 5th intercostal space, midclavicular line

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2. External Features

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3. Chambers of the Heart

A. Right Atrium (RA)

• Receives deoxygenated blood from:
  • Superior Vena Cava (SVC) - from upper body
  • Inferior Vena Cava (IVC) - from lower body
  • Coronary Sinus - from heart muscle itself
• Thin-walled, low-pressure chamber
• Separated from left atrium by the interatrial septum
• Contains the fossa ovalis (remnant of fetal foramen ovale)

B. Right Ventricle (RV)

• Receives blood from the RA through the Tricuspid valve
• Pumps deoxygenated blood to the lungs via the Pulmonary artery
• Thinner-walled, crescent-shaped
• Wall thickness: ~5 mm
• Works against low pressure (pulmonary circulation)
• Contracts in a bellows-like, peristaltic manner

C. Left Atrium (LA)

• Receives oxygenated blood from the lungs via 4 Pulmonary veins (2 right, 2 left)
• Thin-walled but slightly thicker than RA
• Separated from RA by the interatrial septum

D. Left Ventricle (LV)

• Receives blood from the LA through the Mitral (bicuspid) valve
• Pumps oxygenated blood to the entire body via the Aorta
• Thick-walled, ellipsoidal in shape
• Wall thickness: ~10 mm (thickest chamber)
• Generates high pressure (~120 mmHg systolic) for systemic circulation
• Contains 3 muscle layers: deep sinospiral, superficial sinospiral, superficial bulbospiral

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4. Septa (Dividing Walls)

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5. Valves of the Heart (4 Valves)

A. Atrioventricular (AV) Valves

• Both AV valves are attached to papillary muscles via chordae tendineae
• Chordae tendineae prevent valve prolapse during ventricular contraction

B. Semilunar Valves

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6. Blood Flow Through the Heart

Body → SVC/IVC → Right Atrium → (Tricuspid Valve) → Right Ventricle
→ (Pulmonary Valve) → Pulmonary Artery → Lungs (oxygenation)
→ Pulmonary Veins → Left Atrium → (Mitral Valve) → Left Ventricle
→ (Aortic Valve) → Aorta → Body

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7. Fibrous Skeleton of the Heart

• Forms the structural framework of the heart
• Components: Annuli of all 4 valves + aortic/pulmonary roots + central fibrous body + left and right fibrous trigones
• Functions:
  1. Supports and anchors the 4 valves
  2. Resists forces of developed pressure
  3. Provides insertion for subepicardial muscle
  4. Acts as electrical insulator between atria and ventricles (forces impulse through AV node)

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8. Layers of the Heart Wall

• 60-70% of cardiac cells are cardiac fibroblasts (not muscle cells) - they produce collagen and maintain the extracellular matrix

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9. Coronary Blood Supply

• Right Coronary Artery (RCA): Supplies RA, RV, SA node, AV node, inferior wall of LV
• Left Coronary Artery (LCA): Divides into:
  • Left Anterior Descending (LAD): Supplies anterior LV wall, interventricular septum
  • Left Circumflex (LCx): Supplies lateral and posterior LV wall, LA
• Coronary arteries fill predominantly during diastole
• Coronary veins drain into the coronary sinus, which opens into the RA

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10. Conduction System

• Normal heart rate generated by SA node: 60-100 beats/min

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11. Nerve Supply

• Sympathetic (T1-T5): Increases heart rate (chronotropy) and contractility (inotropy) - "fight or flight"
• Parasympathetic (Vagus nerve, CN X): Decreases heart rate - "rest and digest"

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Key Points for Exam

• LV wall is twice as thick as RV (~10 mm vs ~5 mm)
• Mitral valve has 2 cusps; all others have 3
• SA node is the primary pacemaker
• Coronary arteries fill during diastole
• Chordae tendineae prevent valve prolapse (not valve opening)
• The fibrous skeleton electrically insulates atria from ventricles

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Congenital Heart Disease (CHD)

1. Definition

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2. Incidence

• Occurs in approximately 8-10 per 1000 live births
• Most common congenital anomaly in humans
• VSD is the most common individual CHD lesion
• Tetralogy of Fallot is the most common cyanotic CHD

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3. Etiology / Risk Factors

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4. Classification

A. Acyanotic CHD (Left-to-Right Shunts) - "Pink babies"

B. Cyanotic CHD (Right-to-Left Shunts) - "Blue babies"

Memory Aid - "5 T's" of cyanotic CHD: Tetralogy of Fallot, Transposition of Great Arteries, Tricuspid Atresia, Total Anomalous Pulmonary Venous Return, Truncus Arteriosus

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5. Important Individual Lesions

A. Ventricular Septal Defect (VSD)

• Most common CHD
• Defect in the interventricular septum (most often membranous portion)
• Shunt: Left-to-right (high LV pressure → RV)
• Murmur: Loud, harsh pansystolic murmur at left lower sternal border
• Complications: Pulmonary hypertension → Eisenmenger syndrome (shunt reversal to R→L with cyanosis)
• Treatment: Small VSDs may close spontaneously; large ones need surgical/catheter closure

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B. Atrial Septal Defect (ASD)

• Defect in the interatrial septum; most common type = Secundum ASD (80%)
  • Due to incomplete closure of septum primum / patent foramen ovale
• Shunt: Left-to-right
• Incidence: 13 per 10,000 live births
• Features: Often asymptomatic in childhood; adults develop dyspnea, palpitations, right heart failure
• Murmur: Ejection systolic murmur at pulmonary area + fixed split S2
• Treatment: Surgical patch closure or catheter-based Amplatzer septal occluder device (>60% of cases now catheter-based); closure recommended before school age

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C. Patent Ductus Arteriosus (PDA)

• Failure of the ductus arteriosus (fetal bypass channel) to close after birth
• Normally closes within 1-2 days due to:
  • Increased arterial oxygenation
  • Decreased pulmonary vascular resistance
  • Declining prostaglandin E2 levels
• Shunt: Left-to-right (Aorta → Pulmonary artery)
• Murmur: Continuous "machinery-like" murmur (pathognomonic)
• Complications: Infective endocarditis, Eisenmenger syndrome
• Treatment:
  • Medical: Indomethacin (prostaglandin inhibitor) to promote closure in premature infants
  • Surgical: Ligation or catheter-based coil/device closure

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D. Tetralogy of Fallot (TOF)

1. P - Pulmonary stenosis (right ventricular outflow tract obstruction - subpulmonic stenosis)
2. R - Right ventricular hypertrophy
3. O - Overriding aorta (aorta straddles the VSD)
4. V - VSD (large, near membranous septum)

All four result from anterosuperior displacement of the infundibular septum

• Heart is enlarged and "boot-shaped" (coeur en sabot) on X-ray - due to RV hypertrophy
• Aorta is dilated; pulmonary trunk is hypoplastic
• RV wall may exceed LV wall thickness

• Central cyanosis from birth or early infancy (severity depends on degree of pulmonary stenosis)
• Clubbing of fingers and toes (hypertrophic osteoarthropathy)
• Polycythemia (due to chronic hypoxia)
• Squatting (characteristic posture - increases systemic vascular resistance, reduces R→L shunt)
• "Tet spells" (hypercyanotic episodes) - sudden worsening of cyanosis, especially on crying/exertion
• Murmur: Ejection systolic murmur (pulmonary stenosis component)
• Pulmonary hypertension does NOT develop (pulmonic stenosis protects the pulmonary vasculature)
• Risk of infective endocarditis and paradoxical embolism

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E. Transposition of Great Arteries (TGA)

• Aorta arises from RV and Pulmonary artery arises from LV - complete reversal
• Two parallel and independent circulations → incompatible with life unless mixing exists (via ASD, VSD, or PDA)
• Most common cause of cyanosis in the neonate
• Treatment: Arterial switch operation (Jatene procedure)

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F. Coarctation of Aorta

• Narrowing of the aorta, usually just distal to the left subclavian artery (at the ligamentum arteriosum)
• Associated with Turner syndrome and bicuspid aortic valve
• Features:
  • Hypertension in upper limbs
  • Hypotension and weak/absent pulses in lower limbs
  • Rib notching on X-ray (due to collateral vessels)
  • Radio-femoral delay
• Treatment: Balloon angioplasty, stenting, or surgical resection

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6. Eisenmenger Syndrome

• Occurs when a long-standing left-to-right shunt (VSD, ASD, PDA) causes pulmonary hypertension → eventually the shunt reverses to right-to-left → late cyanosis
• Once established, cardiac surgery is contraindicated
• Management: Pulmonary vasodilators (sildenafil, bosentan), heart-lung transplant

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7. Clinical Features - General

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8. Diagnosis / Investigations

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9. Complications

1. Eisenmenger syndrome - shunt reversal (irreversible)
2. Pulmonary arterial hypertension
3. Infective endocarditis (especially VSD, PDA, bicuspid aortic valve)
4. Heart failure (high-output failure in large L→R shunts)
5. Paradoxical embolism (R→L shunts - stroke, systemic emboli)
6. Polycythemia and hyperviscosity (cyanotic CHD)
7. Brain abscess (R→L shunts bypass pulmonary filter)
8. Failure to thrive and growth retardation
9. Arrhythmias (post-surgical or natural history)

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10. Management

Medical

• Indomethacin - closes PDA in premature infants
• Prostaglandin E1 (PGE1) - keeps PDA open when needed (duct-dependent lesions like TGA, tricuspid atresia)
• Diuretics, digoxin for heart failure
• Antibiotic prophylaxis for infective endocarditis

Surgical

• VSD: Patch closure (Dacron or pericardial patch)
• ASD: Direct suture or patch closure; Amplatzer device (catheter-based)
• PDA: Ligation or catheter-based coil/device closure
• TOF: Complete repair - VSD closure + relief of pulmonary outflow obstruction
• TGA: Arterial switch operation (Jatene procedure) in first 2 weeks of life
• Coarctation: Balloon angioplasty / stenting / surgical resection and end-to-end anastomosis

Physiotherapy Role

• Pre- and post-operative respiratory care
• Chest physiotherapy for secretion clearance
• Breathing exercises
• Graduated mobilization and rehabilitation post-surgery
• Monitoring oxygen saturation during activity
• Exercise tolerance training (in acyanotic, post-repair patients)
• Parent/caregiver education

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11. High-Risk Groups for Surgery

1. Cyanosed patients - complex disease, impaired blood clotting post-op; fresh blood preferred for surgery
2. Neonates and infants - unique metabolic and hemodynamic challenges; require specialized centers (>100 ops/year)
3. Pulmonary vascular disease - elevated PVR makes surgery high-risk or contraindicated

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Key Points for Exam

• VSD = most common CHD; TOF = most common cyanotic CHD
• "Machinery murmur" = PDA
• "Boot-shaped heart" on X-ray = TOF
• Fixed split S2 = ASD
• Eisenmenger syndrome = contraindication to corrective surgery
• Squatting is characteristic of TOF (increases SVR, reduces R→L shunt)
• Indomethacin closes PDA; PGE1 keeps it open
• Rubella in 1st trimester → PDA, pulmonary stenosis
• Down syndrome → AVSD (most characteristic), VSD, ASD

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Example of how I'll explain things:

"The ductus arteriosus fails to undergo functional closure due to decreased prostaglandin E2 levels..."

"PDA = a blood vessel that was supposed to close after birth but didn't. Like a door that forgot to shut!" 🚪

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1. 📖 Definition (1-2 simple lines)
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7. 🔬 Investigations (short table)
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Cause
  ↓
What happens in body
  ↓
What you see in patient
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How we treat it

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╔══════════════════════════════════╗
║  🏆 EXAM GOLD POINTS             ║
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