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 C
Explanation
A. These values are within the normal range and not indicative of chronic kidney disease.
B. While an elevated BUN is present, the serum creatinine level is within the normal range, which is not consistent with chronic kidney disease.
C. Both BUN and serum creatinine levels are elevated, indicating impaired kidney function and consistent with chronic kidney disease.
D. These values are within the normal range and not indicative of chronic kidney disease.
Correct Answer is D
Explanation
A. Postoperative pain typically resolves after a laparoscopic cholecystectomy since the surgery removes the gallbladder
B. While positioning during surgery can cause discomfort, isolated right shoulder pain is more commonly attributed to the diaphragmatic irritation from residual nitrous oxide in the abdomen.
C. Nitrous dioxide used during laparoscopic procedures is not associated with referred pain to the right shoulder. The pain is due to carbon dioxide gas used during the procedure resulting in the irritation of the diaphragm.
D. This pain is often due to the carbon dioxide used to inflate the abdomen during surgery, which can irritate the diaphragm and refer pain to the shoulder. Ambulation helps to absorb the gas more quickly.
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