Which of the following systemic effects is observed in a patient with hypovolemic shock? - BTSC 3 August 2025

BTSC 3 August 2025

Medical & Surgical Nursing

Medium

Appeared in: BTSC 3 August 2025

Explanation

Hypovolemic shock results from a significant loss of intravascular fluid, leading to decreased blood pressure.
The body's primary and most immediate compensatory mechanism is the activation of the sympathetic nervous system (SNS).
Baroreceptors in the blood vessels detect the drop in pressure and signal the brain to activate the SNS.
The SNS releases catecholamines (epinephrine and norepinephrine), which cause the heart to beat faster and blood vessels to constrict.
This response aims to increase cardiac output and blood pressure, shunting blood to vital organs like the heart and brain.

Option A: In severe or prolonged shock, cellular hypoxia and systemic inflammation cause an increase, not a decrease, in capillary permeability. This leads to fluid leaking into the interstitial spaces, worsening the shock state.
Option C: The parasympathetic nervous system (the 'rest and digest' system) is actively inhibited during shock. Its effects, such as slowing the heart rate, would be counterproductive to survival.
Option D: In response to low blood flow to the kidneys, the Renin-Angiotensin-Aldosterone System (RAAS) is activated. This leads to an increase in the secretion of aldosterone, a key mineralocorticoid, to promote sodium and water retention.

Clinical Relevance

Nursing practice connection: Prioritize focused assessment, early escalation, and real-time monitoring when managing Systemic compensatory mechanisms in hypovolemic shock in acute care settings.
Nurses must recognize the early signs of SNS compensation—tachycardia, cool and clammy skin, and delayed capillary refill—as critical indicators of shock, even if the patient's blood pressure is initially stable.
Monitoring urine output is a vital nursing intervention. A decrease in urine output (oliguria) is an early sign that compensatory mechanisms like RAAS and ADH are active and that renal perfusion is compromised.
What if? If a patient taking a beta-blocker (e.g., metoprolol) develops hypovolemic shock, the classic compensatory tachycardia may be absent or blunted. The nurse must then rely more heavily on other signs like hypotension, altered mental status, and low urine output to identify the shock state.

How to Approach the Question

First, identify the core concept of the question: the body's systemic response to hypovolemic shock.
Recall the definition of hypovolemic shock: a state of decreased tissue perfusion caused by low blood volume.
Consider the body's primary goal during shock: to maintain blood pressure and perfusion to vital organs (brain, heart).
Evaluate each option based on this goal. Ask yourself, 'Does this action help raise blood pressure and perfuse vital organs?'
Activation of the sympathetic system (fight-or-flight) increases heart rate and constricts blood vessels, which directly supports the goal. This is a likely answer.
Activation of the parasympathetic system, decreasing mineralocorticoids, or decreasing capillary permeability would all either lower blood pressure or worsen fluid loss, making them incorrect compensatory mechanisms.

Concept Tested & Keywords

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