AIM • EXAM REASONING
KMU Past Paper Practice
Chest Trauma, Pleural Disorders & Thoracic Procedures
Final Year MBBS • 20 A-Type Single Best Answer MCQs
MCQ 1
A 29-year-old man is assessed after blunt chest trauma. He is hemodynamically stable but has persistent left-sided breathlessness. Chest imaging demonstrates a pleural abnormality compressing the underlying lung. Which finding would most directly indicate that the abnormality is interfering with ventilation?
Normal peripheral perfusion
Stable systemic blood pressure
Reduced expansion of the affected hemithorax
Absence of external bleeding
Normal level of consciousness
Correct Answer: Reduced expansion of the affected hemithorax
Explanation: Reduced unilateral chest expansion reflects impaired expansion of the underlying lung and therefore supports a mechanically important pleural-space problem.
MCQ 2
A patient with penetrating chest trauma has only a small amount of visible external bleeding but becomes tachycardic and poorly perfused. Examination suggests a large pleural collection. Which explanation best accounts for the apparent discrepancy?
Significant blood loss may be concealed within the pleural cavity
Pleural injury prevents any meaningful blood loss
External bleeding is required before shock can occur
Tachycardia confirms an isolated airway problem
Pleural collections increase circulating blood volume
Correct Answer: Significant blood loss may be concealed within the pleural cavity
Explanation: Hemothorax can conceal substantial intrathoracic blood loss, so external bleeding may underestimate the severity of hemorrhage.
MCQ 3
During the primary survey of a patient with major chest trauma, the airway is patent. The patient is tachypneic, one side of the chest moves poorly, and breath sounds are markedly reduced on that side. Which component of the primary survey is currently identifying the major problem?
Airway assessment
Neurological assessment
Exposure assessment
Circulatory assessment
Breathing assessment
Correct Answer: Breathing assessment
Explanation: Chest movement, respiratory rate and breath sounds are assessed under breathing and help detect important thoracic causes of ventilatory compromise.
MCQ 4
A stable trauma patient has reduced breath sounds on the right, but examination is difficult because of pain and surrounding noise. The team wants a rapid bedside method to determine whether a pleural collection is present. Which investigation is most useful?
Pulmonary function testing
Bedside thoracic ultrasonography
Electrocardiography
Routine sputum microscopy
Peak expiratory flow measurement
Correct Answer: Bedside thoracic ultrasonography
Explanation: Bedside ultrasound can rapidly confirm and localize pleural fluid and can support assessment of traumatic pleural abnormalities.
MCQ 5
A 64-year-old patient has a newly identified pleural effusion. The fluid is moderate in volume and the patient is clinically stable. Which management principle is most appropriate after confirming the collection?
Insert a chest tube in every patient immediately
Treat the effusion without considering its cause
Base further care only on the volume of fluid
Determine the underlying cause and manage it appropriately
Delay assessment until severe respiratory distress develops
Correct Answer: Determine the underlying cause and manage it appropriately
Explanation: Pleural effusion is a manifestation of an underlying disorder; management therefore includes defining and treating the cause rather than drainage alone.
MCQ 6
A patient with an unexplained pleural effusion is being prepared for diagnostic aspiration. The clinician first reviews the ultrasound image and selects a suitable fluid pocket. What is the main advantage of this step?
It confirms a suitable location for safer pleural access
It removes the need for subsequent clinical monitoring
It determines the biochemical composition of the fluid
It guarantees that no complication can occur
It replaces the need to understand thoracic anatomy
Correct Answer: It confirms a suitable location for safer pleural access
Explanation: Ultrasound identifies the location and depth of pleural fluid, improving site selection and reducing avoidable procedural injury.
MCQ 7
While observing pleural aspiration, a student asks why the operator carefully considers the course of the intercostal neurovascular structures before advancing the needle. What is the main reason?
To increase pleural-fluid production
To prevent movement of the diaphragm
To reduce the risk of vascular or nerve injury
To improve systemic venous return
To increase the percussion note over the chest
Correct Answer: To reduce the risk of vascular or nerve injury
Explanation: Understanding intercostal anatomy is an important safety principle because pleural access can injure the neurovascular structures of the chest wall.
MCQ 8
A patient is clinically improved after pleural aspiration. Several hours later he develops increasing breathlessness and reduced air entry on the treated side. What is the most appropriate interpretation of this change?
The procedure has permanently corrected the pleural disorder
The symptoms confirm systemic hypertension
The patient should be reassured without further examination
The symptoms indicate chronic airflow obstruction
A procedure-related pleural complication should be reassessed promptly
Correct Answer: A procedure-related pleural complication should be reassessed promptly
Explanation: New respiratory deterioration after pleural aspiration is abnormal and should prompt assessment for complications such as a new pleural air collection.
MCQ 9
A patient with a pleural effusion has only mild respiratory symptoms, but the cause of the fluid remains uncertain after clinical assessment and imaging. What is the strongest reason to consider pleural aspiration?
To assess airway reversibility
To obtain fluid for diagnostic characterization
To measure systemic arterial pressure
To evaluate cardiac rhythm
To determine pulmonary function volumes
Correct Answer: To obtain fluid for diagnostic characterization
Explanation: An unexplained effusion may require fluid sampling to characterize the collection and guide investigation of the underlying cause.
MCQ 10
A chest drain has been inserted for traumatic pleural disease. During review, the patient is comfortable, oxygenation is improving and the drainage system remains securely connected. Which interpretation is most appropriate?
The drain can no longer develop complications
Further respiratory examination is unnecessary
The underlying disease has necessarily been cured
These findings support clinical response but monitoring should continue
Drain output no longer has clinical relevance
Correct Answer: These findings support clinical response but monitoring should continue
Explanation: Improvement suggests effective treatment, but ongoing assessment is needed to confirm continued recovery and detect drain or disease-related problems.
MCQ 11
A chest drain placed for a pleural air collection becomes disconnected from its drainage system while the patient is being moved. Why is this clinically important?
It causes immediate pleural-fluid analysis
It improves pleural drainage efficiency
It eliminates the need for lung re-expansion
It prevents communication with the atmosphere
It may interfere with controlled pleural drainage and allow recurrence of the problem
Correct Answer: It may interfere with controlled pleural drainage and allow recurrence of the problem
Explanation: A functioning drainage system maintains controlled evacuation of pleural contents; disconnection can compromise treatment and requires prompt attention.
MCQ 12
A patient has a chest drain for traumatic hemothorax. The amount of bloody drainage increases and the patient develops worsening tachycardia and poor peripheral perfusion. What should this pattern suggest?
Successful completion of pleural treatment
Possible ongoing intrathoracic bleeding requiring escalation
Development of isolated bronchospasm
Resolution of circulatory compromise
A normal consequence requiring no reassessment
Correct Answer: Possible ongoing intrathoracic bleeding requiring escalation
Explanation: Increasing bloody drainage together with worsening perfusion suggests continued hemorrhage and should prompt urgent reassessment and surgical involvement.
MCQ 13
A student observes chest-tube insertion in a patient with traumatic pleural disease. Which observation best demonstrates that the procedure is being approached as a complete patient-safety process rather than simply as tube placement?
The indication, anatomical site, analgesia, asepsis and post-insertion reassessment are all considered
Only the size of the skin incision is discussed
Monitoring stops as soon as the tube enters the chest
The drainage system is considered unrelated to the procedure
Patient discomfort is considered irrelevant to safe care
Correct Answer: The indication, anatomical site, analgesia, asepsis and post-insertion reassessment are all considered
Explanation: Safe thoracostomy includes correct indication and anatomy together with asepsis, analgesia, secure drainage and continued clinical reassessment.
MCQ 14
A patient with a moderate pleural effusion improves after treatment directed at the underlying medical condition. Breathlessness decreases and imaging shows less fluid. Which principle is best illustrated?
Every pleural effusion requires thoracostomy
Pleural aspiration is the definitive treatment for every cause
Pleural-fluid appearance alone determines treatment
Treating the underlying disorder can reduce the pleural collection
Clinical improvement makes follow-up unnecessary
Correct Answer: Treating the underlying disorder can reduce the pleural collection
Explanation: Pleural effusion is secondary to an underlying process, so improvement may follow appropriate treatment of the cause without routine invasive drainage.
MCQ 15
A stable patient with traumatic pleural disease is being considered for intervention. Which factor should most strongly determine whether continued observation or active pleural drainage is appropriate?
The patient’s occupation
The time of day when the injury occurred
The physiological effect and clinical severity of the pleural problem
The presence of any chest-wall bruise
The patient’s preference for a specific imaging test
Correct Answer: The physiological effect and clinical severity of the pleural problem
Explanation: Pleural intervention is guided mainly by the patient’s stability, respiratory effect and severity of the collection rather than by incidental details.
MCQ 16
A patient scheduled for thoracostomy appears frightened and asks whether the tube will remain permanently. Which counselling approach is most appropriate?
Explain the purpose of temporary drainage, monitoring and reassessment in understandable language
Avoid discussing the tube because detailed information increases anxiety
Guarantee that the drain will be removed within a fixed period
Discuss only the technical anatomy of the chest wall
Tell the patient that follow-up is unnecessary after insertion
Correct Answer: Explain the purpose of temporary drainage, monitoring and reassessment in understandable language
Explanation: Good counselling addresses the patient’s concern, explains why the tube is required and avoids unsupported promises about duration or outcome.
MCQ 17
A trauma patient with a pleural drain develops sudden worsening dyspnea after changing position in bed. The drainage tubing is visibly kinked. What is the most appropriate interpretation?
The pleural disease has definitely resolved
Kinking improves evacuation from the pleural cavity
The change is unrelated to chest-tube function
The patient should wait for routine outpatient review
Drain dysfunction may be preventing adequate evacuation of the pleural collection
Correct Answer: Drain dysfunction may be preventing adequate evacuation of the pleural collection
Explanation: A kink can obstruct drainage; sudden respiratory deterioration with an obvious system problem requires prompt correction and clinical reassessment.
MCQ 18
A patient has a large pleural collection causing breathlessness. After drainage, symptoms improve considerably, but investigations into the underlying disease are still continuing. Which statement best describes the role of drainage in this patient?
Drainage proves that no underlying disease exists
Drainage replaces all further diagnostic assessment
Drainage can relieve mechanical respiratory compromise while the cause is addressed separately
Drainage primarily treats bronchial smooth-muscle constriction
Drainage eliminates the need for clinical follow-up
Correct Answer: Drainage can relieve mechanical respiratory compromise while the cause is addressed separately
Explanation: Removing a significant pleural collection can improve lung expansion and symptoms, but definitive care still requires management of the underlying cause.
MCQ 19
A patient with blunt chest trauma has moderate respiratory symptoms but remains stable after the primary survey. Which approach best demonstrates appropriate sequencing of care?
Perform detailed imaging before assessing airway or breathing
Complete initial stabilization, then define the thoracic injury with appropriate investigation
Perform pleural aspiration before confirming a pleural collection
Delay assessment until the patient becomes physiologically unstable
Use pulmonary function testing as the initial trauma investigation
Correct Answer: Complete initial stabilization, then define the thoracic injury with appropriate investigation
Explanation: Trauma care first addresses immediate physiological threats; once stable, appropriate imaging and focused investigation can define the injury.
MCQ 20
A patient with a chest tube asks why nurses repeatedly check his breathing, drainage and general condition even though the tube appears to be functioning. What is the best explanation?
Monitoring is performed mainly for administrative documentation
A functioning tube makes clinical deterioration impossible
Drain output has no relationship to clinical progress
Monitoring confirms response and helps identify persistent disease, complications or drain malfunction
Clinical reassessment is needed only after the tube is removed
Correct Answer: Monitoring confirms response and helps identify persistent disease, complications or drain malfunction
Explanation: Chest-tube care includes ongoing assessment of the patient and drainage system because treatment response and complications can change over time.