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Bpt 3rd year Subject clinical cardiothoracis One answer 5 marks Q1.Describe the boundaries and major structures of the thoracic cavity. Q2. What are the main functions of the lungs? Q3. Define a bronchopulmonary segment and explain its clinical importance in lung surgery. Q4. Outline the external features of the heart and name its four chambers. Q5. Draw and label the human lungs. Q6. Describe the involved in the clinical examination of the respiratory system. Q7. Write short notes on ECG. 1. Write short notes on Angiography and Pigeon chest. Q8. Write short notes on Doppler and funnel chest. 1. Write short notes on XRAY. 2. ⁠Define gas analysis. 3. What is the function of the diaphragm?

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This covers thoracic anatomy, respiratory physiology and examination, cardiac anatomy, diagnostic investigations, chest deformities, and diagram practice.
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This covers thoracic anatomy, respiratory physiology and examination, cardiac anatomy, diagnostic investigations, chest deformities, and diagram practice.Your questions cover these sections:
  1. Thoracic cavity and lungs
    Boundaries, contents, functions of lungs, bronchopulmonary segments, and lung diagram.
  2. Heart anatomy
    External features and four chambers of the heart.
  3. Respiratory clinical examination
    Inspection, palpation, percussion, and auscultation.
  4. Cardiothoracic investigations
    ECG, angiography, Doppler, X-ray, and arterial blood gas analysis.
  5. Chest deformities and respiratory muscles
    Pigeon chest, funnel chest, and diaphragm function.
For a 5-mark answer, write: definition/introduction, 4 to 6 key points under headings, clinical importance, and a labelled diagram wherever relevant.
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  1. Thoracic anatomy and lungs
    Q1 to Q5: thoracic cavity, lungs, bronchopulmonary segments, heart external features, labelled lung diagram.
  2. Respiratory examination and cardiac tests
    Q6, ECG, angiography, Doppler, X-ray, and gas analysis.
  3. Chest deformities and diaphragm
    Pigeon chest, funnel chest, and functions of diaphragm.
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Merck Manual physical examination chest lungs ECG chest radiography arterial blood gas analysis

BPT 3rd Year - Clinical Cardiothoracic

Exam-Ready 5-Mark Answer Booklet

Q1. Describe the boundaries and major structures of the thoracic cavity.

Definition

The thoracic cavity is the space within the thoracic cage between the neck and the diaphragm. It contains the lungs, heart, and major vessels.

Boundaries of the thoracic cavity

BoundaryStructures forming it
AnteriorSternum and costal cartilages
PosteriorTwelve thoracic vertebrae and intervertebral discs
LateralTwelve pairs of ribs and intercostal muscles
SuperiorThoracic inlet, bounded by T1 vertebra posteriorly, first ribs laterally, and upper border of manubrium anteriorly
InferiorDiaphragm, which separates thoracic and abdominal cavities

Major subdivisions and contents

  1. Right and left pleural cavities
    • Each contains one lung.
    • Lungs are covered by visceral pleura.
    • Thoracic wall is lined by parietal pleura.
  2. Mediastinum
    • Central space between the two lungs.
    • Contains:
      • Heart and pericardium
      • Great vessels: aorta, venae cavae, pulmonary trunk and veins
      • Trachea and main bronchi
      • Oesophagus
      • Thymus
      • Lymph nodes and thoracic duct
      • Major nerves such as vagus and phrenic nerves

Clinical importance

The thoracic cavity allows expansion of the lungs during inspiration. Diseases such as pleural effusion, pneumothorax, and mediastinal masses can interfere with breathing and cardiac function.

Q2. What are the main functions of the lungs?

The lungs are the main organs of respiration. Their functions are:
  1. Gas exchange
    • Oxygen enters blood from alveoli.
    • Carbon dioxide moves from blood into alveoli and is expired.
  2. Maintenance of acid-base balance
    • By eliminating carbon dioxide, lungs help maintain normal blood pH.
  3. Ventilation
    • Lungs continuously move air in and out through inspiration and expiration.
  4. Defense mechanism
    • Nasal filtration, cough reflex, mucociliary clearance, alveolar macrophages, and immune cells protect against dust and microorganisms.
  5. Metabolic functions
    • Angiotensin-converting enzyme in pulmonary endothelium converts angiotensin I to angiotensin II.
    • Lungs inactivate or modify certain circulating substances.
  6. Phonation
    • Expired air provides the airflow needed for speech.
  7. Blood reservoir and filtration
    • Pulmonary circulation can act as a blood reservoir.
    • Small emboli and air bubbles may be filtered in pulmonary capillaries.

Q3. Define a bronchopulmonary segment and explain its clinical importance in lung surgery.

Definition

A bronchopulmonary segment is a pyramidal, functionally independent subdivision of a lung lobe supplied by a segmental bronchus and a corresponding branch of the pulmonary artery.

Features

  1. It is wedge-shaped or pyramidal.
  2. Its apex faces the hilum of the lung.
  3. Its base lies on the pleural surface.
  4. Each segment is separated from adjacent segments by connective tissue septa.
  5. Pulmonary veins run mainly in the intersegmental planes.
  6. Each segment has its own bronchial and arterial supply.

Number of segments

  • Right lung: usually 10 segments.
  • Left lung: usually 8 to 10 segments because some segments may fuse.

Clinical importance in lung surgery

  1. A diseased segment can be removed by segmentectomy while preserving healthy lung tissue.
  2. Segmental anatomy helps surgeons localize bronchiectasis, tuberculosis, abscess, and localized tumors.
  3. Knowledge of segmental bronchi is useful during bronchoscopy.
  4. Aspiration pneumonia commonly affects dependent bronchopulmonary segments, especially the posterior segment of upper lobe and superior segment of lower lobe in recumbent patients.
  5. Intersegmental veins guide the surgeon during anatomical lung resection.

Q4. Outline the external features of the heart and name its four chambers.

External features of heart

The heart is a hollow muscular organ situated in the middle mediastinum. It is conical in shape.

1. Apex

  • Formed mainly by the left ventricle.
  • Directed downward, forward, and to the left.
  • Located normally in the left 5th intercostal space near the midclavicular line.
  • Apex beat is felt at this site.

2. Base

  • Posterior surface of the heart.
  • Formed mainly by the left atrium, with a small contribution from right atrium.
  • Receives four pulmonary veins.

3. Surfaces

  • Sternocostal or anterior surface: mainly right ventricle.
  • Diaphragmatic or inferior surface: mainly left ventricle and partly right ventricle.
  • Right pulmonary surface: mainly right atrium.
  • Left pulmonary surface: mainly left ventricle.

4. Borders

  • Right border: right atrium.
  • Inferior border: mainly right ventricle.
  • Left border: mainly left ventricle and left auricle.
  • Superior border: atria and great vessels.

5. Grooves

  • Coronary sulcus: separates atria from ventricles.
  • Anterior interventricular groove: marks separation of ventricles on anterior surface.
  • Posterior interventricular groove: marks separation of ventricles on diaphragmatic surface.

Four chambers of the heart

  1. Right atrium
  2. Right ventricle
  3. Left atrium
  4. Left ventricle

Blood flow through chambers

Right atrium → Right ventricle → Pulmonary artery → Lungs → Left atrium → Left ventricle → Aorta → Body.

Q5. Draw and label the human lungs.

Labelled diagram of lungs

                 TRACHEA
                    │
              ______│______
             /             \
     RIGHT MAIN BRONCHUS   LEFT MAIN BRONCHUS
           /                     \
      RIGHT LUNG               LEFT LUNG
   __________________       ________________
  /                  \     /                \
 /   SUPERIOR LOBE    \   /  SUPERIOR LOBE   \
|----------------------| |                    |
|     MIDDLE LOBE      | |      CARDIAC       |
|                      | |       NOTCH        |
|----------------------| |                    |
|     INFERIOR LOBE    | |--------------------|
 \                    /  |   INFERIOR LOBE    |
  \__________________/   \____________________/
          │                       │
       RIGHT HILUM              LEFT HILUM
          │                       │
       RIGHT BASE              LEFT BASE

Right lung: 3 lobes and 2 fissures
Left lung: 2 lobes and 1 fissure, with lingula

Labels to include in the exam diagram

  • Trachea
  • Right main bronchus
  • Left main bronchus
  • Right superior lobe
  • Right middle lobe
  • Right inferior lobe
  • Horizontal fissure
  • Oblique fissure
  • Left superior lobe
  • Left inferior lobe
  • Oblique fissure
  • Cardiac notch
  • Lingula
  • Apex and base
  • Hilum

Important points

  • The right lung is shorter, wider, and has three lobes.
  • The left lung is narrower and has two lobes because the heart occupies space on the left side.
  • Each lung has an apex, base, costal surface, mediastinal surface, and hilum.

Q6. Describe the steps involved in clinical examination of the respiratory system.

A respiratory examination should be done in a well-lit room with the patient sitting comfortably. The main steps are inspection, palpation, percussion, and auscultation. A general examination and relevant systemic examination should also be included. This sequence is consistent with standard pulmonary examination practice described by the Merck Manual.

1. General examination

Observe for:
  • Respiratory distress, cyanosis, pallor, fever, and clubbing
  • Respiratory rate, rhythm, and depth
  • Use of accessory muscles
  • Ability to speak full sentences
  • Body build and posture
  • Oxygen support, inhalers, nebulizers, or chest drains

2. Inspection

Inspect front, sides, and back of chest for:
  • Shape of chest: normal, barrel chest, pigeon chest, funnel chest
  • Symmetry of chest movement
  • Intercostal retractions or supraclavicular indrawing
  • Scars, sinuses, swellings, dilated veins
  • Tracheal position
  • Respiratory movements and accessory muscle use

3. Palpation

Palpate for:
  • Tracheal position
  • Chest expansion on both sides
  • Tactile vocal fremitus
  • Chest wall tenderness
  • Apex beat
  • Crepitus or subcutaneous emphysema

4. Percussion

Percuss both sides symmetrically over anterior, lateral, and posterior chest.
Normal note: resonant.
Abnormal findings:
  • Dull note: consolidation, pleural effusion, collapse
  • Hyper-resonant note: pneumothorax, emphysema
  • Stony dull note: massive pleural effusion

5. Auscultation

Listen to breath sounds with stethoscope.
Assess:
  • Intensity and symmetry of breath sounds
  • Type of breath sounds: vesicular, bronchial, bronchovesicular
  • Added sounds: wheeze, crackles, rhonchi, pleural rub
  • Vocal resonance: bronchophony, egophony, whispered pectoriloquy

6. Completion

  • Examine cardiovascular system.
  • Check peripheral edema, jugular venous pressure, and lymph nodes.
  • Correlate findings with chest X-ray, pulmonary function tests, pulse oximetry, and ABG if needed.

Short Notes

Q7(a). Write short notes on ECG.

Definition

Electrocardiography (ECG) is the graphic recording of the electrical activity of the heart from the body surface.

Standard ECG

A routine ECG is a 12-lead ECG:
  • Three standard bipolar limb leads: I, II, III
  • Three augmented limb leads: aVR, aVL, aVF
  • Six chest leads: V1 to V6

Main ECG waves

  1. P wave
    • Represents atrial depolarization.
  2. PR interval
    • Represents conduction from atria through AV node to ventricles.
    • Normal duration: 0.12 to 0.20 seconds.
  3. QRS complex
    • Represents ventricular depolarization.
    • Normal duration: less than 0.12 seconds.
  4. ST segment
    • Normally isoelectric.
    • Elevation or depression may indicate myocardial ischemia or infarction.
  5. T wave
    • Represents ventricular repolarization.
  6. QT interval
    • Represents total ventricular electrical activity.

Uses of ECG

  • Detects cardiac rhythm and rate.
  • Diagnoses arrhythmias.
  • Detects myocardial ischemia and myocardial infarction.
  • Identifies conduction defects such as heart block and bundle branch block.
  • Suggests chamber enlargement or hypertrophy.
  • Helps assess electrolyte disturbances and drug effects.

Q7(b). Write short notes on angiography.

Definition

Angiography is an imaging procedure in which contrast medium is injected into blood vessels to visualize arteries, veins, or chambers of the heart.

Types

  1. Coronary angiography
  2. Pulmonary angiography
  3. Aortic angiography
  4. Peripheral angiography
  5. Cerebral angiography
  6. CT angiography
  7. MR angiography

Procedure

  1. A catheter is inserted, commonly through radial or femoral artery.
  2. It is guided to the required vessel under fluoroscopy.
  3. Contrast dye is injected.
  4. Serial X-ray images are recorded.

Indications

  • Coronary artery disease
  • Congenital heart disease
  • Valvular heart disease
  • Pulmonary embolism
  • Aneurysm and vascular obstruction
  • Peripheral arterial disease

Advantages

  • Gives detailed view of blood vessels.
  • Identifies site and severity of narrowing or blockage.
  • Allows interventions such as angioplasty and stent placement.

Complications

  • Bleeding or hematoma at puncture site
  • Contrast allergy
  • Arrhythmia
  • Vessel injury
  • Contrast-induced kidney injury
  • Rarely stroke, myocardial infarction, or infection

Q7(c). Write short notes on pigeon chest.

Definition

Pigeon chest, also called pectus carinatum, is a chest wall deformity in which the sternum and adjoining costal cartilages protrude forwards.

Types

  1. Chondrogladiolar type: protrusion of lower sternum, most common type.
  2. Chondromanubrial type: protrusion of upper sternum.

Causes

  • Congenital developmental abnormality
  • Excessive growth of costal cartilage
  • Rickets
  • Connective tissue disorders, such as Marfan syndrome
  • May occur with scoliosis

Clinical features

  • Prominent protruding sternum
  • Narrow chest from side to side
  • Poor cosmetic appearance
  • Mild exertional dyspnea in some patients
  • Fatigue or reduced exercise tolerance in severe cases
  • Associated postural problems may occur

Management

  1. Reassurance in mild cases.
  2. Physiotherapy for posture correction, chest expansion, and breathing exercises.
  3. External chest bracing is effective in children and adolescents with flexible chest wall.
  4. Surgical correction is considered for severe deformity, rigid chest wall, or significant psychosocial concern.

Q8(a). Write short notes on Doppler.

Definition

Doppler ultrasound is a non-invasive investigation that uses the Doppler effect to assess the direction and velocity of blood flow in arteries, veins, and the heart.

Principle

When ultrasound waves strike moving red blood cells, the reflected frequency changes. This frequency shift is used to calculate blood flow velocity and direction.

Types

  1. Continuous-wave Doppler
    • Measures high velocities.
    • Does not precisely localize the depth of flow.
  2. Pulsed-wave Doppler
    • Measures blood flow at a specific site.
    • Used in echocardiography.
  3. Colour Doppler
    • Shows direction and velocity of blood flow in colour.
    • Usually red indicates flow toward and blue indicates flow away from the transducer.
  4. Spectral Doppler
    • Displays blood flow velocity as a waveform.

Uses

  • Detects valvular stenosis and regurgitation.
  • Assesses cardiac output and intracardiac shunts.
  • Diagnoses deep vein thrombosis.
  • Assesses carotid artery stenosis.
  • Detects peripheral arterial disease.
  • Assesses pulmonary artery pressure through echocardiography.

Advantages

  • Non-invasive
  • No ionizing radiation
  • Painless and repeatable
  • Provides real-time flow information

Q8(b). Write short notes on funnel chest.

Definition

Funnel chest, also called pectus excavatum, is a congenital chest wall deformity characterized by posterior depression of the sternum and adjacent costal cartilages.

Causes and associations

  • Usually congenital
  • Excessive growth of costal cartilages
  • May be associated with Marfan syndrome, Ehlers-Danlos syndrome, scoliosis, and connective tissue disorders

Clinical features

  • Depression in the lower sternum
  • Narrow anteroposterior diameter of chest
  • Cosmetic concern
  • Exercise intolerance
  • Dyspnea on exertion
  • Palpitations or chest pain in severe cases
  • In severe deformity, compression or displacement of heart may occur

Assessment

  • Clinical examination
  • Chest X-ray
  • CT scan to determine severity
  • Haller index may be used to assess degree of deformity
  • ECG and echocardiography if cardiac compression is suspected

Management

  1. Observation and reassurance for mild deformity.
  2. Physiotherapy: posture correction, chest expansion exercises, and strengthening exercises.
  3. Vacuum bell therapy in selected children.
  4. Surgical correction for severe deformity or cardiopulmonary symptoms:
    • Nuss procedure
    • Ravitch procedure

Q8(c). Write short notes on X-ray.

Definition

An X-ray is an imaging method that uses ionizing radiation to produce images of internal structures of the body.

Chest X-ray views

  1. Posteroanterior (PA) view
    • Standard view in ambulant patients.
  2. Lateral view
    • Helps localize lesions.
  3. Anteroposterior (AP) view
    • Used in bedridden or critically ill patients.
  4. Decubitus view
    • Helps demonstrate pleural effusion or pneumothorax.

Uses of chest X-ray

  • Detects pneumonia and tuberculosis.
  • Detects pleural effusion and pneumothorax.
  • Detects lung collapse and consolidation.
  • Identifies pulmonary edema.
  • Assesses heart size and cardiac silhouette.
  • Detects rib fractures and chest wall deformities.
  • Identifies mediastinal widening or masses.
  • Checks position of endotracheal tube, central venous catheter, chest drain, and pacemaker leads.

Basic approach to chest X-ray interpretation

Use the ABCDE approach:
  • A: Airway and trachea
  • B: Bones and soft tissues
  • C: Cardiac silhouette and mediastinum
  • D: Diaphragm and costophrenic angles
  • E: Everything else, especially lung fields and pleura

Limitations

  • Uses ionizing radiation.
  • Gives two-dimensional images.
  • Small lesions can be missed.
  • CT scan may be needed for detailed assessment.

Q8(d). Define gas analysis.

Definition

Blood gas analysis, commonly arterial blood gas or ABG analysis, is a laboratory test that measures oxygenation, ventilation, and acid-base status of blood.

Sample

  • Usually taken from the radial artery.
  • Other sites include brachial or femoral artery.

Main parameters measured

  1. pH
    • Indicates acidemia or alkalemia.
  2. PaO₂
    • Partial pressure of oxygen in arterial blood.
    • Assesses oxygenation.
  3. PaCO₂
    • Partial pressure of carbon dioxide.
    • Assesses alveolar ventilation.
  4. HCO₃⁻
    • Indicates metabolic component of acid-base balance.
  5. Base excess or base deficit
    • Helps identify metabolic disturbance.
  6. Oxygen saturation
    • Percentage of hemoglobin saturated with oxygen.

Uses

  • Diagnoses respiratory failure.
  • Detects hypoxemia and hypercapnia.
  • Assesses acidosis and alkalosis.
  • Monitors patients with COPD, asthma, pneumonia, shock, and critical illness.
  • Helps guide oxygen therapy and ventilator settings.

Q8(e). What is the function of the diaphragm?

Definition

The diaphragm is a dome-shaped musculotendinous structure that separates the thoracic cavity from the abdominal cavity. It is the main muscle of inspiration.

Functions of diaphragm

  1. Primary muscle of inspiration
    • When the diaphragm contracts, it descends.
    • This increases vertical diameter and volume of thoracic cavity.
    • Intrapulmonary pressure falls, causing air to enter lungs.
  2. Assists expiration
    • During quiet expiration, diaphragm relaxes and ascends.
    • Elastic recoil of lungs and chest wall expels air.
  3. Increases intra-abdominal pressure
    • Diaphragm contracts with abdominal muscles during coughing, sneezing, vomiting, defecation, micturition, and childbirth.
  4. Aids venous and lymphatic return
    • Pressure changes produced by diaphragmatic movement assist venous return to the heart and lymphatic drainage.
  5. Separates thorax and abdomen
    • Forms a muscular partition between thoracic and abdominal cavities.
  6. Helps maintain posture
    • Works with abdominal and spinal muscles to stabilize the trunk during movement.

Nerve supply

  • The diaphragm is supplied mainly by the phrenic nerve, arising from C3, C4, and C5 spinal segments.
  • Mnemonic: “C3, 4, 5 keep the diaphragm alive.”

Make a one-page revision sheet for all topics

Reading File
A one-page sheet can be built around these revision blocks:
Asking for Preferences

Which block should I turn into a detailed one-page revision sheet first?

This covers thoracic anatomy, respiratory physiology and examination, cardiac anatomy, diagnostic investigations, chest deformities, and diagram practice.Your questions cover these sections:
  1. Thoracic cavity and lungs
    Boundaries, contents, functions of lungs, bronchopulmonary segments, and lung diagram.
  2. Heart anatomy
    External features and four chambers of the heart.
  3. Respiratory clinical examination
    Inspection, palpation, percussion, and auscultation.
  4. Cardiothoracic investigations
    ECG, angiography, Doppler, X-ray, and arterial blood gas analysis.
  5. Chest deformities and respiratory muscles
    Pigeon chest, funnel chest, and diaphragm function.
For a 5-mark answer, write: definition/introduction, 4 to 6 key points under headings, clinical importance, and a labelled diagram wherever relevant.
Reply with the section number you want first, for example: “1” for thoracic cavity and lungs.This is a large set of 5-mark answers. I can prepare it in exam-ready form, but to keep each answer clear and easy to revise, choose one section first:
  1. Thoracic anatomy and lungs
    Q1 to Q5: thoracic cavity, lungs, bronchopulmonary segments, heart external features, labelled lung diagram.
  2. Respiratory examination and cardiac tests
    Q6, ECG, angiography, Doppler, X-ray, and gas analysis.
  3. Chest deformities and diaphragm
    Pigeon chest, funnel chest, and functions of diaphragm.
Reply 1, 2, or 3. I will give complete 5-mark answers for that section, then continue with the remaining sections.# BPT 3rd Year - Clinical Cardiothoracic

Exam-Ready 5-Mark Answer Booklet

Q1. Describe the boundaries and major structures of the thoracic cavity.

Definition

The thoracic cavity is the space within the thoracic cage between the neck and the diaphragm. It contains the lungs, heart, and major vessels.

Boundaries of the thoracic cavity

BoundaryStructures forming it
AnteriorSternum and costal cartilages
PosteriorTwelve thoracic vertebrae and intervertebral discs
LateralTwelve pairs of ribs and intercostal muscles
SuperiorThoracic inlet, bounded by T1 vertebra posteriorly, first ribs laterally, and upper border of manubrium anteriorly
InferiorDiaphragm, which separates thoracic and abdominal cavities

Major subdivisions and contents

  1. Right and left pleural cavities
    • Each contains one lung.
    • Lungs are covered by visceral pleura.
    • Thoracic wall is lined by parietal pleura.
  2. Mediastinum
    • Central space between the two lungs.
    • Contains:
      • Heart and pericardium
      • Great vessels: aorta, venae cavae, pulmonary trunk and veins
      • Trachea and main bronchi
      • Oesophagus
      • Thymus
      • Lymph nodes and thoracic duct
      • Major nerves such as vagus and phrenic nerves

Clinical importance

The thoracic cavity allows expansion of the lungs during inspiration. Diseases such as pleural effusion, pneumothorax, and mediastinal masses can interfere with breathing and cardiac function.

Q2. What are the main functions of the lungs?

The lungs are the main organs of respiration. Their functions are:
  1. Gas exchange
    • Oxygen enters blood from alveoli.
    • Carbon dioxide moves from blood into alveoli and is expired.
  2. Maintenance of acid-base balance
    • By eliminating carbon dioxide, lungs help maintain normal blood pH.
  3. Ventilation
    • Lungs continuously move air in and out through inspiration and expiration.
  4. Defense mechanism
    • Nasal filtration, cough reflex, mucociliary clearance, alveolar macrophages, and immune cells protect against dust and microorganisms.
  5. Metabolic functions
    • Angiotensin-converting enzyme in pulmonary endothelium converts angiotensin I to angiotensin II.
    • Lungs inactivate or modify certain circulating substances.
  6. Phonation
    • Expired air provides the airflow needed for speech.
  7. Blood reservoir and filtration
    • Pulmonary circulation can act as a blood reservoir.
    • Small emboli and air bubbles may be filtered in pulmonary capillaries.

Q3. Define a bronchopulmonary segment and explain its clinical importance in lung surgery.

Definition

A bronchopulmonary segment is a pyramidal, functionally independent subdivision of a lung lobe supplied by a segmental bronchus and a corresponding branch of the pulmonary artery.

Features

  1. It is wedge-shaped or pyramidal.
  2. Its apex faces the hilum of the lung.
  3. Its base lies on the pleural surface.
  4. Each segment is separated from adjacent segments by connective tissue septa.
  5. Pulmonary veins run mainly in the intersegmental planes.
  6. Each segment has its own bronchial and arterial supply.

Number of segments

  • Right lung: usually 10 segments.
  • Left lung: usually 8 to 10 segments because some segments may fuse.

Clinical importance in lung surgery

  1. A diseased segment can be removed by segmentectomy while preserving healthy lung tissue.
  2. Segmental anatomy helps surgeons localize bronchiectasis, tuberculosis, abscess, and localized tumors.
  3. Knowledge of segmental bronchi is useful during bronchoscopy.
  4. Aspiration pneumonia commonly affects dependent bronchopulmonary segments, especially the posterior segment of upper lobe and superior segment of lower lobe in recumbent patients.
  5. Intersegmental veins guide the surgeon during anatomical lung resection.

Q4. Outline the external features of the heart and name its four chambers.

External features of heart

The heart is a hollow muscular organ situated in the middle mediastinum. It is conical in shape.

1. Apex

  • Formed mainly by the left ventricle.
  • Directed downward, forward, and to the left.
  • Located normally in the left 5th intercostal space near the midclavicular line.
  • Apex beat is felt at this site.

2. Base

  • Posterior surface of the heart.
  • Formed mainly by the left atrium, with a small contribution from right atrium.
  • Receives four pulmonary veins.

3. Surfaces

  • Sternocostal or anterior surface: mainly right ventricle.
  • Diaphragmatic or inferior surface: mainly left ventricle and partly right ventricle.
  • Right pulmonary surface: mainly right atrium.
  • Left pulmonary surface: mainly left ventricle.

4. Borders

  • Right border: right atrium.
  • Inferior border: mainly right ventricle.
  • Left border: mainly left ventricle and left auricle.
  • Superior border: atria and great vessels.

5. Grooves

  • Coronary sulcus: separates atria from ventricles.
  • Anterior interventricular groove: marks separation of ventricles on anterior surface.
  • Posterior interventricular groove: marks separation of ventricles on diaphragmatic surface.

Four chambers of the heart

  1. Right atrium
  2. Right ventricle
  3. Left atrium
  4. Left ventricle

Blood flow through chambers

Right atrium → Right ventricle → Pulmonary artery → Lungs → Left atrium → Left ventricle → Aorta → Body.

Q5. Draw and label the human lungs.

Labelled diagram of lungs

                 TRACHEA
                    │
              ______│______
             /             \
     RIGHT MAIN BRONCHUS   LEFT MAIN BRONCHUS
           /                     \
      RIGHT LUNG               LEFT LUNG
   __________________       ________________
  /                  \     /                \
 /   SUPERIOR LOBE    \   /  SUPERIOR LOBE   \
|----------------------| |                    |
|     MIDDLE LOBE      | |      CARDIAC       |
|                      | |       NOTCH        |
|----------------------| |                    |
|     INFERIOR LOBE    | |--------------------|
 \                    /  |   INFERIOR LOBE    |
  \__________________/   \____________________/
          │                       │
       RIGHT HILUM              LEFT HILUM
          │                       │
       RIGHT BASE              LEFT BASE

Right lung: 3 lobes and 2 fissures
Left lung: 2 lobes and 1 fissure, with lingula

Labels to include in the exam diagram

  • Trachea
  • Right main bronchus
  • Left main bronchus
  • Right superior lobe
  • Right middle lobe
  • Right inferior lobe
  • Horizontal fissure
  • Oblique fissure
  • Left superior lobe
  • Left inferior lobe
  • Oblique fissure
  • Cardiac notch
  • Lingula
  • Apex and base
  • Hilum

Important points

  • The right lung is shorter, wider, and has three lobes.
  • The left lung is narrower and has two lobes because the heart occupies space on the left side.
  • Each lung has an apex, base, costal surface, mediastinal surface, and hilum.

Q6. Describe the steps involved in clinical examination of the respiratory system.

A respiratory examination should be done in a well-lit room with the patient sitting comfortably. The main steps are inspection, palpation, percussion, and auscultation. A general examination and relevant systemic examination should also be included. This sequence is consistent with standard pulmonary examination practice described by the Merck Manual.

1. General examination

Observe for:
  • Respiratory distress, cyanosis, pallor, fever, and clubbing
  • Respiratory rate, rhythm, and depth
  • Use of accessory muscles
  • Ability to speak full sentences
  • Body build and posture
  • Oxygen support, inhalers, nebulizers, or chest drains

2. Inspection

Inspect front, sides, and back of chest for:
  • Shape of chest: normal, barrel chest, pigeon chest, funnel chest
  • Symmetry of chest movement
  • Intercostal retractions or supraclavicular indrawing
  • Scars, sinuses, swellings, dilated veins
  • Tracheal position
  • Respiratory movements and accessory muscle use

3. Palpation

Palpate for:
  • Tracheal position
  • Chest expansion on both sides
  • Tactile vocal fremitus
  • Chest wall tenderness
  • Apex beat
  • Crepitus or subcutaneous emphysema

4. Percussion

Percuss both sides symmetrically over anterior, lateral, and posterior chest.
Normal note: resonant.
Abnormal findings:
  • Dull note: consolidation, pleural effusion, collapse
  • Hyper-resonant note: pneumothorax, emphysema
  • Stony dull note: massive pleural effusion

5. Auscultation

Listen to breath sounds with stethoscope.
Assess:
  • Intensity and symmetry of breath sounds
  • Type of breath sounds: vesicular, bronchial, bronchovesicular
  • Added sounds: wheeze, crackles, rhonchi, pleural rub
  • Vocal resonance: bronchophony, egophony, whispered pectoriloquy

6. Completion

  • Examine cardiovascular system.
  • Check peripheral edema, jugular venous pressure, and lymph nodes.
  • Correlate findings with chest X-ray, pulmonary function tests, pulse oximetry, and ABG if needed.

Short Notes

Q7(a). Write short notes on ECG.

Definition

Electrocardiography (ECG) is the graphic recording of the electrical activity of the heart from the body surface.

Standard ECG

A routine ECG is a 12-lead ECG:
  • Three standard bipolar limb leads: I, II, III
  • Three augmented limb leads: aVR, aVL, aVF
  • Six chest leads: V1 to V6

Main ECG waves

  1. P wave
    • Represents atrial depolarization.
  2. PR interval
    • Represents conduction from atria through AV node to ventricles.
    • Normal duration: 0.12 to 0.20 seconds.
  3. QRS complex
    • Represents ventricular depolarization.
    • Normal duration: less than 0.12 seconds.
  4. ST segment
    • Normally isoelectric.
    • Elevation or depression may indicate myocardial ischemia or infarction.
  5. T wave
    • Represents ventricular repolarization.
  6. QT interval
    • Represents total ventricular electrical activity.

Uses of ECG

  • Detects cardiac rhythm and rate.
  • Diagnoses arrhythmias.
  • Detects myocardial ischemia and myocardial infarction.
  • Identifies conduction defects such as heart block and bundle branch block.
  • Suggests chamber enlargement or hypertrophy.
  • Helps assess electrolyte disturbances and drug effects.

Q7(b). Write short notes on angiography.

Definition

Angiography is an imaging procedure in which contrast medium is injected into blood vessels to visualize arteries, veins, or chambers of the heart.

Types

  1. Coronary angiography
  2. Pulmonary angiography
  3. Aortic angiography
  4. Peripheral angiography
  5. Cerebral angiography
  6. CT angiography
  7. MR angiography

Procedure

  1. A catheter is inserted, commonly through radial or femoral artery.
  2. It is guided to the required vessel under fluoroscopy.
  3. Contrast dye is injected.
  4. Serial X-ray images are recorded.

Indications

  • Coronary artery disease
  • Congenital heart disease
  • Valvular heart disease
  • Pulmonary embolism
  • Aneurysm and vascular obstruction
  • Peripheral arterial disease

Advantages

  • Gives detailed view of blood vessels.
  • Identifies site and severity of narrowing or blockage.
  • Allows interventions such as angioplasty and stent placement.

Complications

  • Bleeding or hematoma at puncture site
  • Contrast allergy
  • Arrhythmia
  • Vessel injury
  • Contrast-induced kidney injury
  • Rarely stroke, myocardial infarction, or infection

Q7(c). Write short notes on pigeon chest.

Definition

Pigeon chest, also called pectus carinatum, is a chest wall deformity in which the sternum and adjoining costal cartilages protrude forwards.

Types

  1. Chondrogladiolar type: protrusion of lower sternum, most common type.
  2. Chondromanubrial type: protrusion of upper sternum.

Causes

  • Congenital developmental abnormality
  • Excessive growth of costal cartilage
  • Rickets
  • Connective tissue disorders, such as Marfan syndrome
  • May occur with scoliosis

Clinical features

  • Prominent protruding sternum
  • Narrow chest from side to side
  • Poor cosmetic appearance
  • Mild exertional dyspnea in some patients
  • Fatigue or reduced exercise tolerance in severe cases
  • Associated postural problems may occur

Management

  1. Reassurance in mild cases.
  2. Physiotherapy for posture correction, chest expansion, and breathing exercises.
  3. External chest bracing is effective in children and adolescents with flexible chest wall.
  4. Surgical correction is considered for severe deformity, rigid chest wall, or significant psychosocial concern.

Q8(a). Write short notes on Doppler.

Definition

Doppler ultrasound is a non-invasive investigation that uses the Doppler effect to assess the direction and velocity of blood flow in arteries, veins, and the heart.

Principle

When ultrasound waves strike moving red blood cells, the reflected frequency changes. This frequency shift is used to calculate blood flow velocity and direction.

Types

  1. Continuous-wave Doppler
    • Measures high velocities.
    • Does not precisely localize the depth of flow.
  2. Pulsed-wave Doppler
    • Measures blood flow at a specific site.
    • Used in echocardiography.
  3. Colour Doppler
    • Shows direction and velocity of blood flow in colour.
    • Usually red indicates flow toward and blue indicates flow away from the transducer.
  4. Spectral Doppler
    • Displays blood flow velocity as a waveform.

Uses

  • Detects valvular stenosis and regurgitation.
  • Assesses cardiac output and intracardiac shunts.
  • Diagnoses deep vein thrombosis.
  • Assesses carotid artery stenosis.
  • Detects peripheral arterial disease.
  • Assesses pulmonary artery pressure through echocardiography.

Advantages

  • Non-invasive
  • No ionizing radiation
  • Painless and repeatable
  • Provides real-time flow information

Q8(b). Write short notes on funnel chest.

Definition

Funnel chest, also called pectus excavatum, is a congenital chest wall deformity characterized by posterior depression of the sternum and adjacent costal cartilages.

Causes and associations

  • Usually congenital
  • Excessive growth of costal cartilages
  • May be associated with Marfan syndrome, Ehlers-Danlos syndrome, scoliosis, and connective tissue disorders

Clinical features

  • Depression in the lower sternum
  • Narrow anteroposterior diameter of chest
  • Cosmetic concern
  • Exercise intolerance
  • Dyspnea on exertion
  • Palpitations or chest pain in severe cases
  • In severe deformity, compression or displacement of heart may occur

Assessment

  • Clinical examination
  • Chest X-ray
  • CT scan to determine severity
  • Haller index may be used to assess degree of deformity
  • ECG and echocardiography if cardiac compression is suspected

Management

  1. Observation and reassurance for mild deformity.
  2. Physiotherapy: posture correction, chest expansion exercises, and strengthening exercises.
  3. Vacuum bell therapy in selected children.
  4. Surgical correction for severe deformity or cardiopulmonary symptoms:
    • Nuss procedure
    • Ravitch procedure

Q8(c). Write short notes on X-ray.

Definition

An X-ray is an imaging method that uses ionizing radiation to produce images of internal structures of the body.

Chest X-ray views

  1. Posteroanterior (PA) view
    • Standard view in ambulant patients.
  2. Lateral view
    • Helps localize lesions.
  3. Anteroposterior (AP) view
    • Used in bedridden or critically ill patients.
  4. Decubitus view
    • Helps demonstrate pleural effusion or pneumothorax.

Uses of chest X-ray

  • Detects pneumonia and tuberculosis.
  • Detects pleural effusion and pneumothorax.
  • Detects lung collapse and consolidation.
  • Identifies pulmonary edema.
  • Assesses heart size and cardiac silhouette.
  • Detects rib fractures and chest wall deformities.
  • Identifies mediastinal widening or masses.
  • Checks position of endotracheal tube, central venous catheter, chest drain, and pacemaker leads.

Basic approach to chest X-ray interpretation

Use the ABCDE approach:
  • A: Airway and trachea
  • B: Bones and soft tissues
  • C: Cardiac silhouette and mediastinum
  • D: Diaphragm and costophrenic angles
  • E: Everything else, especially lung fields and pleura

Limitations

  • Uses ionizing radiation.
  • Gives two-dimensional images.
  • Small lesions can be missed.
  • CT scan may be needed for detailed assessment.

Q8(d). Define gas analysis.

Definition

Blood gas analysis, commonly arterial blood gas or ABG analysis, is a laboratory test that measures oxygenation, ventilation, and acid-base status of blood.

Sample

  • Usually taken from the radial artery.
  • Other sites include brachial or femoral artery.

Main parameters measured

  1. pH
    • Indicates acidemia or alkalemia.
  2. PaO₂
    • Partial pressure of oxygen in arterial blood.
    • Assesses oxygenation.
  3. PaCO₂
    • Partial pressure of carbon dioxide.
    • Assesses alveolar ventilation.
  4. HCO₃⁻
    • Indicates metabolic component of acid-base balance.
  5. Base excess or base deficit
    • Helps identify metabolic disturbance.
  6. Oxygen saturation
    • Percentage of hemoglobin saturated with oxygen.

Uses

  • Diagnoses respiratory failure.
  • Detects hypoxemia and hypercapnia.
  • Assesses acidosis and alkalosis.
  • Monitors patients with COPD, asthma, pneumonia, shock, and critical illness.
  • Helps guide oxygen therapy and ventilator settings.

Q8(e). What is the function of the diaphragm?

Definition

The diaphragm is a dome-shaped musculotendinous structure that separates the thoracic cavity from the abdominal cavity. It is the main muscle of inspiration.

Functions of diaphragm

  1. Primary muscle of inspiration
    • When the diaphragm contracts, it descends.
    • This increases vertical diameter and volume of thoracic cavity.
    • Intrapulmonary pressure falls, causing air to enter lungs.
  2. Assists expiration
    • During quiet expiration, diaphragm relaxes and ascends.
    • Elastic recoil of lungs and chest wall expels air.
  3. Increases intra-abdominal pressure
    • Diaphragm contracts with abdominal muscles during coughing, sneezing, vomiting, defecation, micturition, and childbirth.
  4. Aids venous and lymphatic return
    • Pressure changes produced by diaphragmatic movement assist venous return to the heart and lymphatic drainage.
  5. Separates thorax and abdomen
    • Forms a muscular partition between thoracic and abdominal cavities.
  6. Helps maintain posture
    • Works with abdominal and spinal muscles to stabilize the trunk during movement.

Nerve supply

  • The diaphragm is supplied mainly by the phrenic nerve, arising from C3, C4, and C5 spinal segments.
  • Mnemonic: **“C3, 4, 5 keep the diaphragm alive.”**A one-page sheet can be built around these revision blocks:# BPT 3rd Year Clinical Cardiothoracic

One-Page Revision Sheet: 5-Mark Questions

1. Thoracic Cavity

Boundaries
  • Anterior: sternum and costal cartilages
  • Posterior: 12 thoracic vertebrae
  • Lateral: ribs and intercostal muscles
  • Superior: thoracic inlet
  • Inferior: diaphragm
Contents
  • Two pleural cavities and lungs
  • Mediastinum: heart, pericardium, great vessels, trachea, oesophagus, thymus, lymph nodes, nerves

2. Functions of Lungs

  • Exchange O₂ and CO₂
  • Maintain acid-base balance by eliminating CO₂
  • Ventilation
  • Defence: cough, mucociliary clearance, macrophages
  • Metabolic role: ACE converts angiotensin I to angiotensin II
  • Enables speech by providing airflow
  • Filters small emboli and acts as blood reservoir

3. Bronchopulmonary Segment

Definition: A pyramidal, independent part of a lung lobe supplied by one segmental bronchus and pulmonary arterial branch.
Key points
  • Apex points to hilum; base faces pleura
  • Pulmonary veins lie between segments
  • Right lung: 10 segments
  • Left lung: 8 to 10 segments
  • Surgical importance: diseased segment can be removed by segmentectomy while preserving healthy lung tissue.

4. External Features of Heart

  • Apex: left ventricle; left 5th intercostal space, midclavicular line
  • Base: mainly left atrium; posterior
  • Surfaces: sternocostal, diaphragmatic, right and left pulmonary
  • Grooves: coronary sulcus, anterior and posterior interventricular grooves
  • Chambers: right atrium, right ventricle, left atrium, left ventricle
Blood flow:
RA → RV → pulmonary artery → lungs → LA → LV → aorta

5. Lungs: Diagram Labels

Right lung
  • Superior, middle, inferior lobes
  • Horizontal and oblique fissures
Left lung
  • Superior and inferior lobes
  • Oblique fissure
  • Cardiac notch and lingula
Also label: trachea, main bronchi, apex, base, hilum.

6. Respiratory System Examination

Order: IPPA
  1. Inspection
    • Chest shape, symmetry, respiratory rate and pattern
    • Cyanosis, clubbing, scars, accessory muscle use, retractions
  2. Palpation
    • Tracheal position
    • Chest expansion
    • Tactile vocal fremitus
    • Tenderness and apex beat
  3. Percussion
    • Resonant: normal
    • Dull: consolidation/collapse
    • Stony dull: pleural effusion
    • Hyper-resonant: pneumothorax/emphysema
  4. Auscultation
    • Breath sounds: vesicular or bronchial
    • Added sounds: crackles, wheeze, rhonchi, pleural rub
    • Vocal resonance

7. ECG

Definition: Graphic recording of electrical activity of heart.
Waves
  • P: atrial depolarization
  • PR interval: AV conduction, 0.12 to 0.20 s
  • QRS: ventricular depolarization, <0.12 s
  • ST segment: normally isoelectric
  • T: ventricular repolarization
Uses: rate, rhythm, arrhythmias, myocardial infarction/ischemia, heart block, chamber hypertrophy, electrolyte and drug effects.

8. Angiography

Definition: Contrast imaging of blood vessels.
Method: Catheter via radial/femoral artery → contrast injection → fluoroscopic images.
Uses: coronary artery disease, aneurysm, vascular obstruction, peripheral arterial disease, pulmonary embolism.
Risks: bleeding, contrast allergy, renal injury, arrhythmia, vessel damage.

9. Doppler

Definition: Ultrasound method using frequency shift from moving RBCs to assess blood-flow direction and velocity.
Types: continuous-wave, pulsed-wave, colour, spectral Doppler.
Uses: valvular stenosis/regurgitation, DVT, carotid stenosis, peripheral arterial disease, intracardiac shunts.

10. Chest X-ray

Views: PA, lateral, AP, decubitus.
Uses: pneumonia, TB, pleural effusion, pneumothorax, collapse, pulmonary edema, cardiomegaly, fractures, tubes and lines.
ABCDE reading
  • A: airway
  • B: bones
  • C: cardiac silhouette
  • D: diaphragm
  • E: everything else, including lungs and pleura

11. Blood Gas Analysis (ABG)

Definition: Test of oxygenation, ventilation, and acid-base balance, usually from radial artery.
Parameters: pH, PaO₂, PaCO₂, HCO₃⁻, base excess, oxygen saturation.
Uses: respiratory failure, hypoxemia, hypercapnia, acidosis/alkalosis, monitoring ventilated and critically ill patients.

12. Pigeon Chest

Pectus carinatum: forward protrusion of sternum and costal cartilages.
  • Causes: congenital, rickets, Marfan syndrome
  • Features: prominent sternum, cosmetic concern, occasional exertional dyspnea
  • Treatment: posture and breathing exercises, bracing in adolescents, surgery if severe

13. Funnel Chest

Pectus excavatum: posterior depression of sternum and adjoining costal cartilages.
  • Features: sunken chest, cosmetic concern, dyspnea, exercise intolerance, palpitations in severe cases
  • Assessment: chest X-ray/CT, Haller index, ECG and echocardiography
  • Treatment: physiotherapy, vacuum bell in selected cases, Nuss or Ravitch surgery if severe

14. Diaphragm

  • Main muscle of inspiration
  • On contraction: descends, increases thoracic volume, air enters lungs
  • On relaxation: rises, aiding expiration
  • Increases intra-abdominal pressure for coughing, vomiting, defecation, micturition, and childbirth
  • Assists venous and lymphatic return
  • Separates thoracic and abdominal cavities
  • Nerve supply: phrenic nerve, C3-C5
  • Mnemonic: “C3, 4, 5 keep the diaphragm alive.”
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