Surgery MCQs Q25

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SURGERY • CARDIOTHORACIC

A patient presents to the emergency department with hypotension, tachycardia, distended neck veins, and muffled heart sounds following chest trauma. Cardiac tamponade is suspected.

What is the emergency treatment?

A Positive pressure ventilation

B Immediate thoracotomy

C Immediate needle aspiration of pericardial sac

D Intravenous antibiotics

E Immediate pericardiotomy

The emergency procedure is needle pericardiocentesis (aspiration) to relieve obstructive pressure and restore cardiac filling.

Decoding the Stem

1

CLUE "Hypotension + distended veins + muffled sounds"

TRANSLATION Beck’s Triad: Pathognomonic for Cardiac Tamponade.

2

CLUE "Post chest trauma"

MECHANISM Blood in the pericardial sac creating obstructive shock.

Explanation

C. Immediate needle aspiration: Correct. Needle pericardiocentesis is the priority emergency procedure. Removing even a small amount of fluid significantly drops the intrapericardial pressure.

A. Positive pressure ventilation: Incorrect. It increases intrathoracic pressure, which decreases venous return further, potentially causing cardiac arrest in tamponade patients.

B. Immediate thoracotomy: Incorrect. This is a massive intervention reserved for specific indications like penetrating trauma with witnessed arrest, not the standard first-line for tamponade.

E. Immediate pericardiotomy: Incorrect. While this is the "surgical window" used for definitive management, the immediate "emergency" bedside step is needle aspiration.

🧠 Tamponade Quick Reference

Feature	Key Finding	Clinical Context
Shock Type	Obstructive	Fluid blocks heart filling
Pulse	Pulsus Paradoxus	BP drop >10mmHg on inspiration
ECG	Electrical Alternans	Heart "swinging" in fluid
Echo	Diastolic Collapse	Gold standard investigation

Integrated Clinical Questions

1. What is the most sensitive investigation for cardiac tamponade?

Answer: Echocardiography (demonstrates pericardial effusion and right-sided chamber collapse).

2. Why does hypotension occur in cardiac tamponade?

Answer: Reduced ventricular filling (preload) leads to a drastic decrease in Cardiac Output.

3. What classic pulse finding is associated with tamponade?

Answer: Pulsus paradoxus.

4. What is the definitive treatment after initial stabilization?

Answer: Surgical pericardial window (pericardiotomy).

5. What are the common non-traumatic causes of tamponade?

Answer: Malignancy, uremia, and infection (viral or TB pericarditis).

⚡ Exam Pearls

• Needle first: Tamponade is an emergency clinical diagnosis; do not wait for imaging if Beck's triad is present.
• Obstructive Shock: Distinguish this from hypovolemic shock by looking for distended neck veins.
• Surgical Window: Always mention this as the follow-up definitive step.

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