A patient presents with continuous pink frothy sputum due to a cardiogenic cause, acute pulmonary edema. What is the primary underlying pathophysiology?

Appeared in: NORCET-11 Prelims

Explanation

Cardiogenic pulmonary edema is caused by increased hydrostatic pressure in pulmonary capillaries due to left ventricular failure.
This pressure forces transudate (low-protein fluid) into the alveoli, resulting in pink frothy sputum.
The key mechanism is transudation, not exudation or bleeding.

Option A: Rupture of bronchial arteries would cause frank hemoptysis (coughing up blood), not pink frothy sputum. This is not the mechanism in cardiogenic pulmonary edema.
Option C: Continuous alveolar irritation and mucosal hypersecretion are features of chronic bronchitis or irritant exposure, not acute pulmonary edema.
Option D: Exudative fluid accumulation due to increased vascular permeability is the hallmark of non-cardiogenic pulmonary edema (e.g., ARDS), not cardiogenic causes.

Clinical Relevance

Nursing practice connection: Use the key finding related to Pathophysiology of cardiogenic pulmonary edema and mechanism of fluid accumulation in alveoli to guide bedside assessment, documentation, and the next nursing action.
Nurses must recognize pink frothy sputum as a sign of acute pulmonary edema, which is a medical emergency.
Prompt identification and intervention (oxygen, diuretics, positioning) can be life-saving.
What if? If the underlying cause was non-cardiogenic (e.g., ARDS), the fluid would be exudative and management would focus on treating the underlying injury or inflammation, not just reducing hydrostatic pressure.

How to Approach the Question

Identify the clinical clue: pink frothy sputum suggests alveolar fluid.
Link the cause (cardiogenic) to the mechanism: left heart failure increases hydrostatic pressure.
Recall that transudate (not exudate) is typical in cardiogenic edema.
Eliminate options that involve bleeding, chronic irritation, or exudative processes.
Choose the mechanism that matches the clinical and pathophysiological scenario.

Concept Tested & Keywords

Concept Tested: Pathophysiology of cardiogenic pulmonary edema and mechanism of fluid accumulation in alveoli
Stem keywords: pink frothy sputum, cardiogenic cause, acute pulmonary edema, pathophysiology
Lead-in keywords: primary underlying pathophysiology
Clinical cues: pink frothy sputum indicates alveolar fluid mixed with blood
Clinical cues: cardiogenic cause points to heart failure mechanism

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