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"]
Explanation
A. Pain is not typically a primary side effect of chemotherapy for acute lymphocytic leukemia.
B. Chemotherapy for acute lymphocytic leukemia often involves high doses to target rapidly dividing cancer cells and induce remission.
C. Chemotherapy for acute lymphocytic leukemia aims to induce remission by destroying cancerous cells in the bone marrow and peripheral blood.
D. Chemotherapy can suppress the immune system, increasing the risk of infections and illness during treatment.
E. Chemotherapy for acute lymphocytic leukemia often involves multiple cycles of treatment, which may include different drugs and frequencies.
Correct Answer is C
Explanation
A. While anemia may weaken the immune system, it is not directly associated with an increased risk of urinary tract infections.
B. Osteoporosis is a bone-related condition and is not directly related to the risk of urinary tract infections.
C. Diabetes mellitus increases the risk of urinary tract infections due to elevated glucose levels in the urine, which provide a favorable environment for bacterial growth.
D. Chronic obstructive pulmonary disease (COPD) is not directly associated with an increased risk of urinary tract infections.
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