The nurse is reviewing a patient's electrocardiogram (ECG) tracing. Which of the following are characteristics of normal sinus rhythm (NSR?

QRS interval less than or equal to 0.10 seconds

Heart rate 50-100 bpm

P waves are rounded and inverted, and follow each QRS complex

PR interval 0.34 to 0.43 seconds

Answer and Explanation

The Correct Answer is B

A.   The QRS interval may vary but is typically less than 0.12 seconds in normal sinus rhythm.
B.   Normal sinus rhythm typically has a heart rate between 50 and 100 beats per minute.
C.   In normal sinus rhythm, P waves are typically upright and precede each QRS complex.
D.   The PR interval may vary but is typically between 0.12 and 0.20 seconds in normal sinus rhythm.

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Correct Answer is B

Explanation

A. A negative waveform indicates a downward deflection from the baseline on an ECG tracing, which may correspond to electrical activity such as depolarization or repolarization of cardiac chambers.
B. An isoelectric line represents the baseline on an ECG tracing when there is no net electrical activity occurring in the heart. It appears flat and represents a period of electrical silence.
C. A downward deflection on an ECG tracing refers to a negative waveform, as mentioned above.
D. A positive waveform on an ECG tracing indicates an upward deflection from the baseline, representing electrical activity such as depolarization or repolarization.

A. Notify the health-care provider. B. Start oxygen at 2 L/min. C. Order an electrocardiogram and cardiac enzymes. D. Place bed in modified Trendelenburg position. E. Allow the patient to rest alone. F. Elevate the head of the bed.

Correct Answer is ["A","B","C","F"]

Explanation

A. Increased premature ventricular contractions along with symptoms of anxiety and shortness of breath may indicate worsening cardiac function or an acute cardiac event, necessitating immediate medical attention.
B. Oxygen therapy may help alleviate symptoms of shortness of breath and improve oxygenation in patients experiencing cardiac symptoms.
C. These diagnostic tests can provide valuable information about cardiac function and any potential myocardial damage or ischemia, helping guide further treatment and management.
D. The modified Trendelenburg position may increase cardiac workload, which is not beneficial in the case of PVCs.
E. The patient should not be left alone due to the need for ongoing assessment and potential rapid intervention. Furthermore, leaving them alone could worsen their anxiety.
F. Elevating the head of the bed can aid in breathing and comfort, reducing the sensation of breathlessness.

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The nurse is reviewing a patient's electrocardiogram (ECG) tracing. Which of the following are characteristics of normal sinus rhythm (NSR?

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Naxlex Comprehensive Predictor Exams

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