AIIMS Delhi NO- 2019: Symptoms of acute blood loss are:

AIIMS Delhi NO- 2019

Applied Physiology

Easy

Appeared in: AIIMS Delhi NO- 2019

Explanation

Acute blood loss causes hypovolemia, a decrease in the circulating blood volume.
The body's initial compensatory response, driven by the sympathetic nervous system, is to increase the heart rate (tachycardia) to maintain cardiac output and oxygen delivery.
As blood loss becomes significant (typically over 30% of blood volume), these compensatory mechanisms fail, leading to a drop in blood pressure (hypotension).
The combination of tachycardia and hypotension is a classic sign of decompensated hypovolemic shock, a life-threatening condition.

Option A: Hypertension (high blood pressure) is incorrect. Significant blood loss leads to a decrease, not an increase, in blood pressure.
Option B: Both bradycardia (slow heart rate) and hypertension (high blood pressure) are incorrect responses to acute blood loss.
Option D: Bradycardia (slow heart rate) is not the typical initial response. Tachycardia is the body's primary compensatory mechanism. Bradycardia may appear as a late, pre-terminal sign in profound shock, but tachycardia is the characteristic finding.

Clinical Relevance

Nursing practice connection: Use the key finding related to Physiological response to acute blood loss (Hemorrhagic Shock) to guide bedside assessment, documentation, and the next nursing action.
Early recognition of tachycardia is crucial, as it is one of the first signs of compensation for blood loss, often appearing before hypotension develops (compensated shock).
A nurse's priority for a patient with signs of acute blood loss is to establish large-bore intravenous access for rapid fluid resuscitation (e.g., with crystalloids like Normal Saline or Ringer's Lactate) and prepare for potential blood transfusion.
What if? If a patient on beta-blocker medication experiences acute blood loss, their heart rate may not become tachycardic due to the medication's effect. In this case, the nurse must rely on other signs like hypotension, cool clammy skin, and altered mental status to recognize shock.

How to Approach the Question

First, analyze the term 'acute blood loss'. This implies a rapid decrease in the body's total blood volume (hypovolemia).
Recall the body's immediate physiological response to maintain perfusion to vital organs. The sympathetic nervous system is activated.
Sympathetic activation causes the heart to beat faster to pump the remaining blood more effectively. This is tachycardia.
Consider what happens when the blood loss is too great for the body to handle. The compensatory mechanisms fail, and the blood pressure drops. This is hypotension.
Scan the options to find the pair that matches this sequence: an initial compensatory increase in heart rate (tachycardia) followed by decompensation and a drop in blood pressure (hypotension).

Concept Tested & Keywords

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E6 Physiology Ganong 27e Vol 2 Part 1 p. 95-97