📝 Step 5 — KMU Past Papers & Exam Learning
This section contains KMU-style past paper questions designed to strengthen conceptual understanding. Focus on understanding explanations rather than memorizing answers.
🎯 How to Study KMU Past Papers
- Read the question carefully.
- Think about the answer before looking.
- Read the explanation slowly.
- Understand the reasoning behind the correct answer.
- Revise difficult questions again.
MCQ 1
Question:
A patient with congestive cardiac failure develops bilateral lower-limb edema and later a deep-vein thrombosis. Which effect of reduced venous flow most strongly promotes clot formation?
Options:
Dilution of activated coagulation factors
Rapid delivery of natural anticoagulants
Reduced contact between platelets and endothelium
Failure to clear activated coagulation factors
Increased production of tissue plasminogen activator
Correct Answer:
Failure to clear activated coagulation factors
Explanation:
Venous stasis prevents dilution and removal of activated clotting factors, allowing coagulation to continue locally.
MCQ 2
Question:
An elderly patient with an aortic aneurysm develops a mural thrombus within the dilated segment. Which abnormality most directly contributes to thrombosis at this site?
Options:
Local turbulence with pockets of stasis
Reduced systemic coagulation activity
Increased endothelial nitric oxide release
Accelerated breakdown of fibrin
Reduced interaction of platelets with the wall
Correct Answer:
Local turbulence with pockets of stasis
Explanation:
Aneurysmal dilatation disrupts laminar flow and creates turbulence and local stasis, both of which promote thrombosis.
MCQ 3
Question:
A patient with protein C deficiency is at increased risk of venous thrombosis because protein C normally inactivates which coagulation factors?
Options:
Factors IIa and Xa
Factors VIIa and IXa
Factors Va and VIIIa
Factors XIa and XIIa
Factors XIIIa and fibrinogen
Correct Answer:
Factors Va and VIIIa
Explanation:
Activated protein C, with protein S as a cofactor, limits coagulation by inactivating factors Va and VIIIa.
MCQ 4
Question:
A patient with nephrotic syndrome develops renal-vein thrombosis. Which acquired abnormality most contributes to this hypercoagulable state?
Options:
Urinary loss of natural anticoagulants
Reduced hepatic fibrinogen synthesis
Increased platelet destruction
Excessive plasmin generation
Reduced production of clotting factors
Correct Answer:
Urinary loss of natural anticoagulants
Explanation:
Loss of anticoagulant proteins, particularly antithrombin, contributes to thrombosis in nephrotic syndrome.
MCQ 5
Question:
An embolus arising from infective endocarditis lodges in the renal circulation. Which additional consequence distinguishes this embolus from a sterile thromboembolus?
Options:
Formation of a hemorrhagic infarct only
Development of a secondary abscess
Rapid recanalization of the vessel
Conversion into a postmortem clot
Loss of inflammatory response
Correct Answer:
Development of a secondary abscess
Explanation:
Septic emboli carry microorganisms and may produce both vascular occlusion and infection with abscess formation.
MCQ 6
Question:
An elderly patient develops painful blue toes and renal dysfunction after manipulation of an atherosclerotic aorta. Which embolic material is most likely responsible?
Options:
Fat droplets
Nitrogen bubbles
Amniotic debris
Cholesterol crystals
Tumour-cell clusters
Correct Answer:
Cholesterol crystals
Explanation:
Disruption of an atherosclerotic plaque may release cholesterol crystals that obstruct small arteries in the skin, kidneys and other organs.
MCQ 7
Question:
A patient with pulmonary embolism has severe breathlessness despite relatively preserved lung ventilation. Which change best explains the increase in physiological dead space?
Options:
Ventilated alveoli receive reduced perfusion
Perfused alveoli receive reduced ventilation
Pulmonary venous pressure increases uniformly
Alveolar diffusion becomes markedly enhanced
Bronchial arterial flow becomes excessive
Correct Answer:
Ventilated alveoli receive reduced perfusion
Explanation:
Pulmonary arterial obstruction creates ventilated but underperfused alveoli, increasing physiological dead space.
MCQ 8
Question:
A patient with a peripheral pulmonary embolus develops sharp chest pain worsened by inspiration. Which pathological process most directly produces this symptom?
Options:
Irritation of the pleura overlying an infarct
Dilatation of the left atrium
Reduced coronary arterial flow
Stretching of the aortic wall
Obstruction of the superior vena cava
Correct Answer:
Irritation of the pleura overlying an infarct
Explanation:
Peripheral pulmonary infarction near the pleural surface causes pleural inflammation and pleuritic pain.
MCQ 9
Question:
A patient with suspected pulmonary embolism has a normal chest radiograph. Which statement best describes the diagnostic value of this finding?
Options:
It excludes a major embolus
It confirms a ventilation-perfusion mismatch
It supports the use of ventilation-perfusion imaging
It indicates absence of right-heart strain
It eliminates the need for further testing
Correct Answer:
It supports the use of ventilation-perfusion imaging
Explanation:
A relatively normal chest radiograph improves the interpretability of a ventilation-perfusion scan but does not exclude pulmonary embolism.
MCQ 10
Question:
A patient with acute pulmonary embolism has elevated brain natriuretic peptide levels. What is the most likely basis of this finding?
Options:
Left-atrial rupture
Right-ventricular wall stress
Pulmonary infarct infection
Systemic arterial vasodilatation
Excessive fibrinolysis
Correct Answer:
Right-ventricular wall stress
Explanation:
Raised natriuretic peptides in pulmonary embolism reflect right-ventricular pressure overload and myocardial strain.
MCQ 11
Question:
A patient with pulmonary embolism has a normal echocardiogram. Which interpretation is most appropriate?
Options:
A small embolus remains possible
Pulmonary embolism is excluded
Anticoagulation is contraindicated
Pulmonary infarction is confirmed
Thrombolysis is immediately required
Correct Answer:
A small embolus remains possible
Explanation:
Echocardiography may be normal in smaller emboli and is mainly useful for detecting right-ventricular strain in more significant disease.
MCQ 12
Question:
A patient with pulmonary embolism is normotensive, has normal cardiac biomarkers and no right-ventricular dysfunction. Which management approach is most appropriate after confirming low clinical risk?
Options:
Immediate systemic thrombolysis
Routine surgical embolectomy
Anticoagulation with possible early discharge
Long-term intravenous vasopressor therapy
Routine placement of an inferior vena cava filter
Correct Answer:
Anticoagulation with possible early discharge
Explanation:
Selected low-risk patients may be managed with anticoagulation and considered for early discharge after appropriate assessment.
MCQ 13
Question:
A patient receiving anticoagulation for pulmonary embolism develops recurrent embolic episodes despite documented therapeutic treatment. Which intervention may be considered?
Options:
Stopping all anticoagulation
Adding dual antiplatelet therapy
Placing an inferior vena cava filter
Administering long-term thrombolysis
Starting pulmonary vasodilators
Correct Answer:
Placing an inferior vena cava filter
Explanation:
An IVC filter may be considered in selected patients with recurrent embolism despite adequate anticoagulation.
MCQ 14
Question:
A postoperative patient at high risk of venous thromboembolism is unable to receive pharmacological prophylaxis because of active bleeding. Which preventive measure is most appropriate?
Options:
Prolonged complete bed rest
Mechanical compression of the lower limbs
Routine systemic thrombolysis
Long-term oxygen therapy
High-dose antiplatelet therapy
Correct Answer:
Mechanical compression of the lower limbs
Explanation:
Mechanical compression reduces venous stasis and is useful when pharmacological thromboprophylaxis is contraindicated.
MCQ 15
Question:
A patient with pulmonary hypertension due to chronic mitral regurgitation develops peripheral edema. Which sequence best explains this finding?
Options:
Pulmonary pressure rises → right-heart failure → systemic venous congestion
Aortic pressure falls → left-heart output rises → sodium loss
Pulmonary resistance falls → right-heart preload decreases → edema
Left-atrial pressure falls → renal perfusion rises → fluid retention
Systemic resistance falls → venous pressure decreases → edema
Correct Answer:
Pulmonary pressure rises → right-heart failure → systemic venous congestion
Explanation:
Chronic pulmonary hypertension increases right-ventricular workload and may progress to right-sided failure with systemic venous congestion and edema.
MCQ 16
Question:
A patient with pulmonary hypertension has a loud pulmonary component of the second heart sound. Which change produces this finding?
Options:
Forceful closure of the pulmonary valve
Delayed closure of the mitral valve
Reduced right-ventricular pressure
Premature opening of the aortic valve
Restricted movement of the tricuspid valve
Correct Answer:
Forceful closure of the pulmonary valve
Explanation:
Elevated pulmonary arterial pressure causes forceful pulmonary-valve closure, producing an accentuated P2.
MCQ 17
Question:
A child with a large untreated patent ductus arteriosus develops progressive pulmonary vascular disease. Which structural vascular change is expected?
Options:
Thinning of the arterial media
Medial hypertrophy and intimal proliferation
Loss of pulmonary capillaries from birth
Acute rupture of pulmonary veins
Calcification of the mitral valve
Correct Answer:
Medial hypertrophy and intimal proliferation
Explanation:
Chronic high pulmonary flow and pressure cause pulmonary arterial medial hypertrophy and intimal proliferation, raising vascular resistance.
MCQ 18
Question:
A patient with severe left-ventricular diastolic dysfunction develops pulmonary hypertension. Which hemodynamic event is most closely related to the pulmonary pressure rise?
Options:
Reduced left-ventricular filling pressure
Raised left-ventricular end-diastolic pressure
Reduced left-atrial pressure
Increased pulmonary arterial compliance
Reduced pulmonary venous pressure
Correct Answer:
Raised left-ventricular end-diastolic pressure
Explanation:
A stiff left ventricle raises filling pressure, which is transmitted backward through the left atrium and pulmonary veins.
MCQ 19
Question:
A patient with pulmonary hypertension secondary to severe aortic stenosis is being evaluated. Which finding most strongly indicates advanced right-heart involvement?
Options:
Raised jugular venous pressure with hepatomegaly
Isolated systolic hypertension
Reduced pulse pressure without congestion
A soft pulmonary component of S2
An isolated carotid bruit
Correct Answer:
Raised jugular venous pressure with hepatomegaly
Explanation:
Raised JVP and hepatomegaly indicate systemic venous congestion due to right-sided heart failure.
MCQ 20
Question:
A patient with pulmonary hypertension caused by left-heart disease is started empirically on a pulmonary arterial vasodilator and develops worsening breathlessness. Which mechanism best explains this deterioration?
Options:
Increased pulmonary venous congestion
Reduced pulmonary blood flow
Acute systemic thrombosis
Reduced left-atrial filling
Increased fibrinolysis
Correct Answer:
Increased pulmonary venous congestion
Explanation:
Pulmonary vasodilation may increase blood flow toward an already high-pressure left atrium, worsening pulmonary congestion or edema when the underlying cause is left-heart disease.
📌 Important Exam Strategy
KMU examinations often test integrated understanding rather than isolated facts. Focus on linking anatomy, embryology, histology, and clinical concepts when reviewing questions.
✅ Revision Tip
If you can explain the reason behind the correct answer without looking at notes, your concept is strong.