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","C","D","E","G","H"]
Explanation
A. Polycythemia (an abnormally high red blood cell count) is not typically a primary concern in dialysis patients; instead, they are more often monitored for anemia.
B. Dialysis patients often need to restrict fluid intake to prevent fluid overload, which can exacerbate edema and cause additional cardiovascular strain.
C. Daily weight monitoring is crucial for dialysis patients to track fluid balance and detect any sudden changes that might indicate fluid retention or loss.
D. Frequent oral care is important to prevent infections, particularly because dialysis patients are at increased risk due to their compromised immune systems and possible fluid restrictions, which can lead to dry mouth and other oral health issues.
E. Dialysis patients may need a modified protein intake, depending on their specific needs and the type of dialysis (hemodialysis vs. peritoneal dialysis). Protein needs can vary, so it is essential to follow the specific dietary recommendations provided by a healthcare provider.
F. Avoiding nephrotoxic substances (e.g., certain medications, contrast dyes) is critical to protect the remaining kidney function and prevent further damage.
G. A low-sodium diet helps manage blood pressure and fluid balance, reducing the risk of fluid retention and hypertension in dialysis patients.
H. Monitoring urine output is important to assess kidney function and fluid balance.
Even though dialysis takes over some kidney functions, any remaining urine output can provide valuable information about the patient's residual kidney function.
Correct Answer is B
Explanation
A. In the oliguric phase of acute kidney injury, fluid intake may need to be restricted rather than encouraged to prevent fluid overload.
B. Hourly intake and output monitoring is crucial for managing fluid balance and assessing the progression of kidney injury. Close monitoring can help prevent fluid overload, which is a risk due to the reduced urine output. It also aids in the timely adjustment of fluid administration and the detection of any changes in the client's condition that may necessitate intervention.
C. Nonsteroidal anti-inflammatory drugs (NSAIDs) such as ibuprofen are contraindicated in acute kidney injury as they can further impair renal function.
D. In the oliguric phase, protein intake may need to be restricted to reduce the workload on the kidneys and minimize azotemia. A high-protein diet can increase the burden on already compromised kidneys due to the increased production of urea, a byproduct of protein metabolism that requires excretion by the kidneys.
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