The nurse notes that leads I, II, and III differ from one another on the cardiac rhythm strip because:

The view of the electrical current changes in relation to the lead placement.

Conduction of the heart differs with lead placement.

Electrocardiogram (ECG) equipment has malfunctioned.

The circadian rhythm has changed.

Answer and Explanation

The Correct Answer is A

A. The view of the electrical current changes in relation to the lead placement – Each ECG lead offers a different angle or view of the heart's electrical activity, so the waveforms in leads I, II, and III naturally look different. This variation helps clinicians assess different parts of the heart.
B. Conduction of the heart differs with lead placement – The heart's electrical conduction system functions independently of lead placement; only the view of the conduction changes.
C. Electrocardiogram (ECG) equipment has malfunctioned – Lead differences are expected and normal; this is not a sign of malfunction.
D. The circadian rhythm has changed – Circadian rhythms affect general physiological patterns but do not cause variation in ECG lead appearance.

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Correct Answer is A

Explanation

A. A friction rub is the characteristic auscultatory finding in pericarditis. It is a high-pitched, scratchy sound heard best at the left lower sternal border and is caused by the inflamed pericardial layers rubbing against each other.
B. Wheezes are continuous, musical sounds usually associated with airway narrowing, such as in asthma or COPD.
C. Rales (crackles) are heard in conditions like pulmonary edema or pneumonia, not pericarditis.
D. Rhonchi are low-pitched, snoring sounds associated with mucus or obstruction in the larger airways.

A. ventricular tachycardia. B. ventricular fibrillation. C. sinus tachycardia. D. atrial flutter.

Correct Answer is A

Explanation

A. Ventricular tachycardia is characterized by a ventricular rate >100 bpm, regular rhythm, no visible P waves, and wide QRS complexes (>0.12 seconds). The findings described—ventricular rate of 162, regular R-R intervals, no visible P waves, and a QRS duration of 0.18 seconds—are consistent with ventricular tachycardia.
B. Ventricular fibrillation shows a chaotic, irregular rhythm with no identifiable QRS complexes, which is not the case here.
C. Sinus tachycardia would have visible P waves and a normal QRS duration.
D. Atrial flutter typically has "sawtooth" flutter waves and a more organized atrial rhythm with a distinct P wave pattern, which is absent in this scenario.

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The nurse notes that leads I, II, and III differ from one another on the cardiac rhythm strip because:

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Explanation

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Explanation

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