After reviewing an electrocardiogram, the nurse determines that an electrical impulse originated in a patient's sinoatrial (SA) node with a P wave. What does this represent?
Atrial depolarization
Atrial repolarization
Ventricular depolarization
Ventricular repolarization
The Correct Answer is A
A. The P wave on an ECG represents atrial depolarization, which occurs as the electrical impulse originates in the sinoatrial (SA) node and spreads through the atria, initiating atrial contraction.
B. Atrial repolarization typically occurs during the QRS complex and is not represented by the P wave. Atrial repolarization is masked by the larger QRS complex.
C. Ventricular depolarization is represented by the QRS complex on an ECG, as the electrical impulse spreads through the ventricles, leading to ventricular contraction.
D. Ventricular repolarization typically occurs during the T wave and is not represented by the P wave. Ventricular repolarization involves the recovery of ventricular muscle cells after contraction.
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Related Questions
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.
Correct Answer is A
Explanation
A. Straining urine is important to catch any stones that are passed, which can then be analyzed to determine their composition and inform future treatment and prevention strategies.
B. While cold therapy may provide some relief from discomfort associated with kidney stones, it is not the primary intervention for managing kidney stones.
C. Bedrest is generally not recommended for patients with kidney stones. Remaining active may help promote passage of the stone.
D. Adequate fluid intake is essential for preventing kidney stone formation and facilitating stone passage. Restricting fluids can exacerbate the problem by leading to concentrated urine and increased risk of stone formation.
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