Which of the following is least likely to be seen in a dehydrated patient?

BSF Staff Nurse - 2021

Medical & Surgical Nursing

Medium

Appeared in: BSF Staff Nurse - 2021

Explanation

Dehydration involves the loss of plasma fluid from the blood, while the number of red blood cells remains constant.
This process, known as hemoconcentration, leads to a higher concentration of red blood cells relative to the total blood volume.
Consequently, the hematocrit level is expected to be increased in a dehydrated patient.
A decreased hematocrit indicates the opposite condition, hemodilution (fluid overload), or a separate issue like anemia.

Option A: This is an expected sign of dehydration. The kidneys respond to fluid deficit by conserving water, which leads to a reduced volume of concentrated urine (oliguria).
Option B: This is a classic compensatory sign of dehydration. The heart beats faster (tachycardia) to maintain blood pressure and cardiac output when circulating fluid volume is low.
Option C: This can be a sign of dehydration. Fluid is essential for thermoregulation via sweating. Impaired sweating due to significant fluid loss can cause the body's core temperature to rise.

Clinical Relevance

Nursing practice connection: Use the key finding related to Clinical signs and symptoms of dehydration (fluid volume deficit) to guide bedside assessment, documentation, and the next nursing action.
Nurses must be able to rapidly assess for dehydration, as it can progress to serious complications like hypovolemic shock, acute kidney injury, and electrolyte imbalances.
Key nursing interventions include monitoring vital signs (especially heart rate and orthostatic blood pressure), strict intake and output measurement, and assessing skin turgor and mucous membranes.
A urine output of less than 30 mL/hour in an adult is a critical sign of inadequate renal perfusion and must be addressed promptly.

How to Approach the Question

First, understand the question's core concept, which is the physiological response to dehydration (fluid volume deficit).
Note the negative framing: "least likely." This means you are looking for the option that does NOT fit with the clinical picture of dehydration.
Evaluate each option based on the pathophysiology of dehydration:
Low urine output: The body conserves water when dehydrated. This is an expected finding.
Increased pulse rate: The heart compensates for low blood volume by beating faster. This is an expected finding.
Elevated body temperature: Dehydration impairs the body's ability to cool itself. This is a possible finding.

Concept Tested & Keywords

Concept Tested: Clinical signs and symptoms of dehydration (fluid volume deficit).
Stem keywords: dehydrated patient, least likely, seen
Lead-in keywords: least likely
Negative lead-in flag: The question asks for the finding that is LEAST likely to occur, which is a negative framing. This requires evaluating each option to find the one that is inconsistent with the clinical picture of dehydration.

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