Surgery MCQs Q16

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SURGERY • TRAUMA (CHEST)

A 44-year-old man is brought to the emergency department after a motorcycle crash. He is immobilized on arrival.

BP: 92 mmHg

Pulse: 120/min

Status: Gasping for breath

On examination: Trachea deviated, absent breath sounds on the right side.

What is the next step in management?

A Fluid bolus challenge

B Immediate chest X-ray

C Needle decompression

D Call for senior help

E Chest drain insertion

Tension Pneumothorax is a clinical diagnosis. Immediate needle decompression converts it into a simple pneumothorax, restoring venous return and cardiac output.

Decoding Clue

1

CLUE "Shock + Respiratory Distress"

TRANS Likely Obstructive Shock in a trauma setting.

2

CLUE "Absent breath sounds (R)"

TRANS Indicates lung collapse or massive pleural space collection.

3

CLUE "Tracheal deviation"

TRANS The definitive sign of mediastinal shift (Tension).

Option Analysis

A. Fluid bolus: Temporarily increases preload but fails to address the compression of the Vena Cava.

B. Immediate CXR: Fatal delay. Diagnosis is clinical; imaging is for post-procedure confirmation.

E. Chest drain: Definitive treatment, but needle decompression is faster and prioritized in the "next step" hierarchy.

High-yield Management

In trauma: Shock + Absent Breath Sounds = Decompress Immediately. Do not wait for a X-ray. Treat first, confirm later.

Relevant Clinical Challenges

Challenge #1: Pathophysiology

Why is tension pneumothorax classified as "Obstructive" shock?

Answer: Shift of mediastinum compresses the Superior and Inferior Vena Cava, leading to a profound decrease in venous return.

Challenge #2: Procedure

What are the recommended sites for needle decompression in adults?

Answer: 2nd Intercostal space (midclavicular line) or the 5th Intercostal space (anterior axillary line).

Challenge #3: Early Signs

What is the most sensitive early sign before tracheal deviation occurs?

Answer: Respiratory distress coupled with unilateral absent breath sounds. Tracheal deviation is often a terminal/late sign.

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