Examine the attached ECG image and identify the type of arrhythmia present.
The ECG shows a series of wide QRS complexes occurring at a rapid rate.

Supraventricular Tachycardia.

Ventricular Tachycardia.

Atrial Fibrillation.

First Degree AV Block.

Answer and Explanation

The Correct Answer is B

Choice A rationale

Supraventricular tachycardia usually presents with narrow QRS complexes originating above the ventricles, unlike the wide QRS complexes seen in this ECG, indicating a ventricular origin for the arrhythmia.

Choice B rationale

Ventricular tachycardia is characterized by a rapid rate and wide QRS complexes. This rhythm originates in the ventricles and can lead to a decrease in cardiac output and possible deterioration into ventricular fibrillation.

Choice C rationale

Atrial fibrillation presents with an irregularly irregular rhythm without distinct P waves and narrow QRS complexes. This is not consistent with the wide, rapid QRS complexes seen in the provided ECG.

Choice D rationale

First-degree AV block is characterized by a prolonged PR interval (>200ms) without changes to the QRS complex morphology. This does not align with the presentation of wide QRS complexes at a rapid rate.

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Correct Answer is D

Explanation

Choice A rationale

A QRS duration of 0.30 seconds is abnormally long. The normal QRS duration is 0.06 to 0.12 seconds, indicating this is not normal sinus rhythm.

Choice B rationale

An inverted T wave is not a characteristic of normal sinus rhythm. It may indicate ischemia or other cardiac abnormalities.

Choice C rationale

A P-R interval of 0.32 seconds is prolonged. The normal P-R interval is 0.12 to 0.20 seconds, thus indicating an abnormal rhythm.

Choice D rationale

The P wave falling before the QRS complex is a key characteristic of normal sinus rhythm, representing the orderly conduction of electrical impulses from atria to ventricles. .

A. Not palpable. B. Slow. C. Irregular. D. Bounding.

Correct Answer is C

Explanation

Choice A rationale

A pulse that is not palpable indicates severe circulatory collapse or cardiac arrest, not a characteristic of atrial fibrillation. It can be an emergency requiring immediate intervention.

Choice B rationale

A slow pulse, or bradycardia, is not a typical feature of atrial fibrillation. Bradycardia is often associated with conditions like hypothyroidism or beta-blocker therapy rather than atrial fibrillation.

Choice C rationale

Atrial fibrillation is characterized by an irregularly irregular pulse due to disorganized electrical activity in the atria, leading to inconsistent ventricular contractions. Pulse rate can vary widely.

Choice D rationale

A bounding pulse, which is strong and forceful, is typically associated with conditions like fever or hyperthyroidism rather than atrial fibrillation. Bounding pulses are not characteristic of atrial fibrillation.

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Examine the attached ECG image and identify the type of arrhythmia present.The ECG shows a series of wide QRS complexes occurring at a rapid rate.

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Naxlex Comprehensive Predictor Exams

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Correct Answer is D

Explanation

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Correct Answer is C

Explanation

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Examine the attached ECG image and identify the type of arrhythmia present.
The ECG shows a series of wide QRS complexes occurring at a rapid rate.