Combined AIIMS - 2020 (Jodhpur, Bhopal, Patna, Raipur)
Medical & Surgical Nursing
Medium
If 'P' wave is absent in ECG rhythm, it is an indication of:
Appeared in: Combined AIIMS - 2020 (Jodhpur, Bhopal, Patna, Raipur)
Explanation
- The P wave on an ECG represents atrial depolarization, which is the electrical activation of the atria initiated by the SA node.
- In Atrial Fibrillation, the atria quiver due to chaotic electrical impulses from multiple sites. This eliminates coordinated atrial depolarization, resulting in the absence of P waves, which are replaced by fine fibrillatory 'f' waves.
- In Sinus Arrest, the SA node fails to generate an impulse for a period of time. This results in a pause on the ECG where the P wave, and consequently the QRS complex and T wave, are all absent.
- Because an absent P wave is a key feature of both conditions, selecting the option that includes both is the most accurate choice.
Why Other Options Were Wrong
- Option A: This option is incomplete. While an absent P wave is a feature of sinus arrest (during the pause), it is not the only condition with this finding.
- Option B: This option is incomplete. Although an absent P wave is a classic sign of atrial fibrillation, it is not the only cause.
- Option D: This option is incorrect because both options A (Sinus arrest) and B (Atrial fibrillation) are valid and well-known conditions indicated by the absence of P waves on an ECG.
Related Visual
Clinical Relevance
- Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain ECG interpretation of arrhythmias, specifically the significance of an absent P wave as background academic context rather than a clinical decision trigger.
- Accurately identifying the cause of an absent P wave is critical for patient management. The treatments for Atrial Fibrillation and Sinus Arrest are very different.
- Patients with Atrial Fibrillation often require rate-controlling medications and anticoagulants to prevent the formation of blood clots and reduce stroke risk.
- Patients with frequent or prolonged episodes of symptomatic Sinus Arrest may require the implantation of a permanent pacemaker to prevent severe bradycardia or asystole.
How to Approach the Question
- First, identify the key clinical finding presented in the question: an "absent 'P' wave" on an ECG.
- Recall the normal cardiac conduction system and the meaning of each waveform. The P wave represents atrial depolarization.
- Analyze Option A (Sinus arrest). In sinus arrest, the SA node fails to fire. This means there is no atrial depolarization, and therefore no P wave during the pause.
- Analyze Option B (Atrial fibrillation). In AFib, the atria have chaotic, disorganized electrical activity. This prevents the formation of a uniform P wave; instead, a fibrillatory baseline is seen.
- Since both conditions result in the absence of a normal P wave, evaluate Option C, which encompasses both possibilities.
- Conclude that Option C is the most comprehensive and correct answer as an absent P wave is a hallmark of both conditions.
Concept Tested & Keywords
- Concept Tested: ECG interpretation of arrhythmias, specifically the significance of an absent P wave.
- Stem keywords: 'P' wave, absent, ECG rhythm
- Lead-in keywords: indication of
- Negative lead-in flag: false
Question ID
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Reference Book
E6 Robert Boland, Marcia L. Verduin - Kaplan and Sadock's Comprehensive Text of Psychiatry-Wolters Kluwer Health (2024) (pp 1-16525 of 16525) p. 7321-7323
E6 Nursing Fundamentals Potter Perry 12e Part 4 p. 234-236
Practise the full Combined AIIMS - 2020 (Jodhpur, Bhopal, Patna, Raipur)
Attempt every question from this paper in a timed mock, then review the full solution for each one.
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