Which abnormal ECG wave is seen in a patient with hypothermia?

NORCET 8 Prelims-2025

Medical & Surgical Nursing

Easy

Appeared in: NORCET 8 Prelims-2025

Explanation

The terms 'Osborn wave' and 'J wave' are used synonymously in clinical practice to describe the same ECG finding.
This wave is a characteristic positive, dome-shaped, or 'humped' deflection seen at the J-point (the junction of the QRS complex and the ST segment).
It is a pathognomonic sign of hypothermia, typically appearing when the core body temperature falls below 32°C (90°F).
The option 'Osborn + J wave' is the most complete answer because it correctly acknowledges that both names refer to the same wave.
The amplitude of the wave is often directly proportional to the degree of hypothermia and decreases as the patient is rewarmed.

Option A: While 'Osborn waves' is a correct name for the finding, this option is incomplete because it doesn't acknowledge the equally valid synonym 'J wave'.
Option B: Similarly, 'J wave' is a correct name but is an incomplete choice because it omits the common synonym 'Osborn wave'.
Option D: This option is incorrect because a very specific and well-documented ECG wave (the Osborn or J wave) is associated with hypothermia.

Visual 1: ECG strip showing a prominent Osborn (J) wave: A diagram highlighting the J-point at the end of the QRS complex, with a clear, positive 'hump' characteristic of the Osborn wave.
Visual 2: Infographic comparing a normal ECG to a hypothermic ECG: Side-by-side comparison showing the appearance of the J wave, bradycardia, and prolonged intervals in the hypothermic tracing.

Clinical Relevance

Nursing practice connection: Use the key finding related to ECG Interpretation in Hypothermia to guide bedside assessment, documentation, and the next nursing action.
Recognizing the Osborn (J) wave on an ECG is a critical skill for nurses, as it is a direct indicator of moderate to severe hypothermia, requiring urgent intervention.
A key nursing action for patients with hypothermia is to handle them gently. Rough movement can trigger lethal arrhythmias like ventricular fibrillation, a risk that is heightened when J waves are present.
Continuous cardiac monitoring is essential during rewarming, as the patient's heart rate and rhythm can change rapidly. The disappearance of the J wave is a positive sign of successful rewarming.

How to Approach the Question

First, identify the key concepts in the question: 'abnormal ECG wave' and 'hypothermia'.
Access your knowledge about the specific ECG changes associated with a low body temperature.
Analyze the options provided. You will notice that 'Osborn waves' and 'J wave' are listed as separate options, and a third option combines them.
Recognize this pattern as a common test question design. When two options are synonyms for the same correct answer, the option that combines them or acknowledges their relationship is often the intended 'best' answer.
Confirm that Osborn wave and J wave are indeed the same thing. Since they are, the most comprehensive and accurate choice is the one that includes both terms.
Eliminate 'None of the above' as you have identified a specific, known ECG finding.

Concept Tested & Keywords

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