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 A
Explanation
A. Pulseless ventricular tachycardia requires immediate defibrillation to restore a perfusing rhythm.
B. Antiarrhythmic medications are not typically effective for pulseless ventricular tachycardia as the heart is not effectively pumping blood.
C. Synchronized cardioversion is used for certain tachyarrhythmias with a pulse but is not appropriate for pulseless ventricular tachycardia.
D. A pacemaker is not indicated for pulseless ventricular tachycardia as it does not address the underlying issue of cardiac arrest.
Correct Answer is D
Explanation
A. Coffee is generally well tolerated unless the patient experiences discomfort or adverse effects from caffeine. It does not typically pose specific risks for patients with Hodgkin's disease.
B. Orange juice is generally safe to consume unless the patient has specific dietary restrictions or intolerances. It provides vitamin C and hydration.
C. Ginger ale is a non-caffeinated, carbonated beverage that is often used to alleviate nausea and upset stomach. It is generally safe to consume for patients with Hodgkin's disease unless there are individual sensitivities.
D. Alcohol consumption, including wine, should be avoided by patients with Hodgkin's disease, especially during treatment. Alcohol can suppress the immune system and may interact with medications or exacerbate side effects.
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