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.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
A. This is partially correct but lacks the detail that the examination is done via an endoscope through the throat.
B. An endoscopic retrograde cholangiopancreatography (ERCP) involves the use of an endoscope to visualize and treat problems in the bile ducts, gallbladder, and pancreas.
C. This statement reflects a misunderstanding of the procedure, as ERCP does not involve shock waves to treat gallstones.
D. This statement also reflects a misunderstanding, as ERCP is primarily a diagnostic procedure and does not involve direct medication delivery to the gallbladder.
Correct Answer is C
Explanation
A. Daily weight monitoring is important for assessing fluid status but may not provide real-time information about fluid balance changes.
B. Vital signs are important for overall assessment but may not specifically address the nursing diagnosis of Excess Fluid Volume unless there are significant changes indicative of fluid overload or dehydration.
C. Monitoring intake and output provides direct information about fluid balance and renal function, helping to identify trends and assess the effectiveness of interventions aimed at managing fluid volume.
D. Skin turgor assessment is useful for evaluating hydration status but may not provide comprehensive data on fluid volume excess alone.
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