Identify the ECG given below:

NORCET 6 Prelims -2024

Medical Surgical Nursing

Hard

Appeared in: NORCET 6 Prelims -2024

Explanation

The ECG displays a characteristic 'sawtooth' pattern of atrial activity, known as flutter waves (F-waves), which replaces normal P waves.
The ventricular rhythm (R-R interval) is regular, indicating a constant atrioventricular (AV) block.
The ventricular rate is rapid (greater than 100 bpm), which, combined with the flutter waves, is indicative of atrial flutter.
The atrial rate is very high (typically 250-350 bpm), but not all impulses conduct to the ventricles, resulting in a slower, but still fast, ventricular response.

Option B: The rhythm in the provided ECG is regular. Atrial fibrillation is defined by an 'irregularly irregular' rhythm and chaotic, non-uniform fibrillatory waves, which are not present here.
Option C: Although the heart rate is fast (tachycardia), the rhythm is not sinus in origin. Sinus tachycardia requires a normal P wave preceding every QRS complex. This ECG shows sawtooth flutter waves instead of P waves.
Option D: Normal sinus rhythm has a heart rate between 60 and 100 bpm and normal P waves. The ECG shows a rate greater than 100 bpm and lacks normal P waves.

Visual 1: Infographic: A side-by-side comparison of ECG strips for Normal Sinus Rhythm, Sinus Tachycardia, Atrial Fibrillation, and Atrial Flutter, with key features like P waves, flutter waves, and R-R intervals clearly labeled to highlight the differences.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain ECG Interpretation of Atrial Arrhythmias as background academic context rather than a clinical decision trigger.
Atrial flutter is a clinically significant arrhythmia because the rapid atrial rate can lead to hemodynamic instability if the ventricular response is too fast.
A major risk associated with atrial flutter (similar to atrial fibrillation) is the formation of blood clots in the atria, which can travel to the brain and cause a stroke. Anticoagulation is a key part of management.
Nursing priorities for a patient with new-onset atrial flutter include assessing for symptoms like palpitations, dizziness, or shortness of breath, monitoring vital signs closely, and preparing for potential interventions such as electrical cardioversion or administration of rate-controlling medications (e.g., beta-blockers, calcium channel blockers).

How to Approach the Question

First, assess the rhythm by measuring the R-R intervals. In this case, they are consistent, indicating a regular rhythm. This makes atrial fibrillation less likely.
Next, calculate the heart rate. Count the number of small squares between two R waves (approx. 12) and divide 1500 by that number (1500/12 = 125 bpm). Since the rate is >100 bpm, it is a tachycardia.
Then, carefully examine the baseline for atrial activity. Look for P waves. In this strip, there are no normal P waves. Instead, there is a continuous, repeating 'sawtooth' pattern between the QRS complexes.
Recognize the 'sawtooth' pattern as flutter waves (F-waves), which is the hallmark of atrial flutter.
Synthesize the findings: a regular tachycardia with sawtooth flutter waves equals Atrial Flutter.

Concept Tested & Keywords

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