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 A

Explanation

Choice A rationale

The first upward deflection in an ECG represents the P wave, indicating atrial depolarization. It precedes the QRS complex and corresponds to the electrical activity associated with atrial contraction, initiating the cardiac cycle.

Choice B rationale

The peak of the first wave corresponds to the R wave, not the P wave. The R wave is a part of the QRS complex, representing ventricular depolarization, and is not associated with atrial depolarization.

Choice C rationale

The downward deflection following the peak is the S wave, part of the QRS complex, indicating ventricular depolarization. It is not related to the P wave, which specifically represents atrial depolarization.

Choice D rationale

The second upward deflection is the T wave, which represents ventricular repolarization. It follows the QRS complex and is not associated with atrial depolarization or the P wave. .

A. Apply cold therapy to the affected leg. B. Monitor Homan’s sign. C. Obtain a venous duplex ultrasound. D. Obtain impedance plethysmography.

Correct Answer is C

Explanation

Choice A rationale

Cold therapy is used for acute injuries to reduce swelling and pain but is not recommended for deep vein thrombosis (DVT) as it can cause vasoconstriction and worsen the condition.

Choice B rationale

Homan's sign is an outdated diagnostic tool for DVT as it is not reliable or specific and can result in false positives or negatives, thus not recommended for diagnosis.

Choice C rationale

Venous duplex ultrasound is the gold standard for diagnosing DVT as it visualizes blood flow and identifies thrombi within the veins, providing accurate and non-invasive detection.

Choice D rationale

Impedance plethysmography measures changes in blood volume but is less accurate than venous duplex ultrasound, and its use has declined in favor of more reliable imaging techniques.

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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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Explanation

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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.