📝 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 develops tenderness and erythema along a superficial forearm vein after repeated intravenous cannulation. Which initiating factor best explains this process?

Options:
Inherited deficiency of clotting factor VIII
Atherosclerotic narrowing of arterial lumen
Local endothelial injury with venous inflammation
Congenital weakness of lymphatic channels
Metastatic spread of endothelial malignancy

Correct Answer:
Local endothelial injury with venous inflammation

Explanation:
Repeated cannulation injures venous endothelium, leading to inflammation with thrombus formation, which is the basis of thrombophlebitis.

MCQ 2

Question:
A deep venous thrombus is clinically more dangerous than a superficial inflamed venous thrombus mainly because it is more likely to cause:

Options:
Pulmonary embolism
Subungual pain
Capillary bleeding lesion
Venous skin pigmentation only
Lobular capillary growth

Correct Answer:
Pulmonary embolism

Explanation:
Deep venous thrombi may detach and travel to pulmonary arteries, producing potentially fatal pulmonary embolism.

MCQ 3

Question:
A pregnant woman develops dilated superficial veins in the lower limb. Which combined factor most likely contributes to this condition?

Options:
Reduced platelet production and arterial spasm
Bacterial invasion and suppurative thrombosis
Raised venous pressure with valve incompetence
Immune vasculitis and fibrinoid necrosis
Malignant transformation of endothelial cells

Correct Answer:
Raised venous pressure with valve incompetence

Explanation:
Pregnancy increases venous pressure and predisposes to reflux through incompetent valves, producing varicose veins.

MCQ 4

Question:
A patient with varicose veins complains of leg heaviness at the end of the day. Which advice is most logically related to the underlying mechanism?

Options:
Avoid all dietary calcium intake
Elevate the legs during rest
Use antibiotics for long duration
Restrict fluid intake permanently
Take opioid analgesics regularly

Correct Answer:
Elevate the legs during rest

Explanation:
Leg elevation reduces venous pressure and improves venous return, so it helps symptoms caused by venous reflux and congestion.

MCQ 5

Question:
A long-standing venous ulcer has surrounding eczema and brown discoloration. Which pathological process best links the venous disease to these skin changes?

Options:
Acute arterial infarction
Primary epidermal malignancy
Failure of lymphoid maturation
Chronic congestion with RBC breakdown
Direct destruction by cardiac glycosides

Correct Answer:
Chronic congestion with RBC breakdown

Explanation:
Venous hypertension causes congestion, edema, RBC extravasation, hemosiderin deposition, dermatitis, and ulceration.

MCQ 6

Question:
A soft compressible bluish lesion is composed of large dilated blood-filled vascular spaces. Which diagnosis best fits this morphology?

Options:
Kaposi sarcoma
Cavernous hemangioma
Angiosarcoma
Glomus tumor
Leiomyosarcoma

Correct Answer:
Cavernous hemangioma

Explanation:
Cavernous hemangioma is a benign vascular lesion made of large dilated vascular channels filled with blood.

MCQ 7

Question:
A malignant tumor arises from the wall of a large vein, especially the inferior vena cava. Which tumor should be considered?

Options:
Capillary hemangioma
Lymphangioma
Pyogenic granuloma
Glomus tumor
Leiomyosarcoma

Correct Answer:
Leiomyosarcoma

Explanation:
Leiomyosarcoma may arise from smooth muscle of large venous walls, classically including the inferior vena cava.

MCQ 8

Question:
A rapidly enlarging vascular mass ulcerates and bleeds. Histology confirms malignant endothelial origin. Which feature would support malignant behavior?

Options:
Stable childhood lesion
Pain only on cold exposure
Infiltrative growth with atypia
Pure lymphatic cystic spaces
Lobular capillary pattern only

Correct Answer:
Infiltrative growth with atypia

Explanation:
Malignant vascular tumors such as angiosarcoma show infiltrative growth, cellular atypia, bleeding, and metastatic potential.

MCQ 9

Question:
A toxicology examiner groups poisons according to their primary cardiac effect. Which group directly produces digoxin-like rhythm disturbance?

Options:
Cardiac glycosides
Sedative hypnotics
Irritant poisons
Corrosive acids
Simple asphyxiants

Correct Answer:
Cardiac glycosides

Explanation:
Cardiac glycosides act directly on cardiac cells and conduction pathways, producing characteristic rhythm disturbances.

MCQ 10

Question:
A patient on digoxin develops toxicity after renal impairment. Which pharmacological property makes this medicine particularly hazardous?

Options:
Rapid destruction in stomach acid
Absence of cardiac action
Purely local skin effect
Narrow therapeutic index
Complete lack of absorption

Correct Answer:
Narrow therapeutic index

Explanation:
Digoxin has a narrow safety margin, so small increases in level due to renal impairment or interactions can cause toxicity.

MCQ 11

Question:
A patient with cardiac glycoside poisoning has slow pulse and AV conduction delay. Which physiological effect contributes to this rhythm pattern?

Options:
Reduced vagal activity at AV node
Increased vagal influence on AV node
Selective skeletal muscle paralysis
Direct platelet aggregation only
Blockade of gastric acid secretion

Correct Answer:
Increased vagal influence on AV node

Explanation:
Cardiac glycosides increase vagal tone at the AV node, causing bradycardia and AV block in toxicity.

MCQ 12

Question:
A patient brought with suspected digoxin poisoning is unstable. Which finding would most strongly justify specific antibody treatment?

Options:
Mild nausea after meal
Stable pulse with normal ECG
Local redness over a vein
Chronic ankle pigmentation
Life-threatening dysrhythmia

Correct Answer:
Life-threatening dysrhythmia

Explanation:
Severe digoxin toxicity with life-threatening arrhythmia is an indication for digoxin-specific Fab fragments where available.

MCQ 13

Question:
A family brings a bottle of herbal extract after a patient develops vomiting, bradycardia, and collapse. Which medicolegal question is most important?

Options:
Whether exposure was accidental, suicidal, or homicidal
Whether the patient had childhood vaccination
Whether the patient had varicose veins earlier
Whether the lesion was capillary or cavernous
Whether the patient had subungual pain

Correct Answer:
Whether exposure was accidental, suicidal, or homicidal

Explanation:
In poisoning, medicolegal assessment includes determining manner of poisoning: accidental, suicidal, homicidal, or iatrogenic.

MCQ 14

Question:
A person ingests parts of an ornamental plant and develops a digoxin-like toxidrome. Which plant is most relevant to this presentation?

Options:
Neem
Aloe vera
Oleander
Wheat grass
Mint

Correct Answer:
Oleander

Explanation:
Oleander contains cardiac glycosides such as oleandrin and produces digoxin-like gastrointestinal and cardiac toxicity.

MCQ 15

Question:
A cocaine user develops severe chest pain and palpitations. Which additional mechanism, apart from catecholamine excess, can contribute to arrhythmia?

Options:
Lymphatic channel obstruction
Venous valve stretching
Histamine receptor blockade
Sodium channel blockade
Platelet factor deficiency

Correct Answer:
Sodium channel blockade

Explanation:
Cocaine can block sodium channels, causing conduction delay and rhythm disturbance, especially in toxicity.

MCQ 16

Question:
A patient using crystal methamphetamine develops hyperthermia and agitation. Which immediate supportive measure is most relevant along with sedation?

Options:
Cooling measures
Venous stripping
Long-term anticoagulation
Consent form filing only
Skin biopsy

Correct Answer:
Cooling measures

Explanation:
Methamphetamine toxicity may cause hyperthermia; cooling and benzodiazepine sedation are important supportive measures.

MCQ 17

Question:
A student is asked to compare cocaine and Oleander poisoning. Which contrast is most accurate?

Options:
Both mainly cause chronic venous ulcers
Both mainly cause benign vascular tumors
Cocaine causes bradycardia while Oleander causes tachycardia
Both are treated primarily with antibiotics
Cocaine causes sympathetic excess while Oleander causes glycoside toxicity

Correct Answer:
Cocaine causes sympathetic excess while Oleander causes glycoside toxicity

Explanation:
Cocaine produces catecholamine-mediated stimulant cardiotoxicity, while Oleander produces digoxin-like cardiac glycoside poisoning.

MCQ 18

Question:
A doctor receives a suspected poisoning case and records the patient’s symptoms, ECG findings, medicine strips, and relatives’ statements. This documentation is important mainly because it:

Options:
Connects clinical findings with legal interpretation
Replaces the need for toxicology testing
Proves the patient had natural disease
Removes the need for police intimation
Confirms consent for all procedures

Correct Answer:
Connects clinical findings with legal interpretation

Explanation:
Good documentation links medical findings, evidence, history, and medicolegal interpretation in suspected poisoning.

MCQ 19

Question:
Before endovenous treatment for varicose veins, the patient asks about non-procedural choices. The doctor should explain this mainly to ensure:

Options:
Technical skill of the operator
Hospital financial approval
Shorter discharge time
Valid informed consent
Automatic legal immunity

Correct Answer:
Valid informed consent

Explanation:
Explaining alternatives is an essential component of informed consent before an invasive procedure.

MCQ 20

Question:
A patient agrees to a venous procedure after the doctor explains benefits and risks, but the patient is confused and unable to understand due to acute delirium. Which requirement is lacking?

Options:
Written hospital record
Use of sterile equipment
Decision-making capacity
Availability of ultrasound
Presence of a diagnosis

Correct Answer:
Decision-making capacity

Explanation:
Valid informed consent requires capacity, understanding, voluntariness, and proper disclosure of risks, benefits, alternatives, and refusal option.

📌 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.