An client being assessed in the emergency room is anxious about their health status. The ECG rhythm strip shows a heart rate of 120 beats/min. Characteristics of a sinus tachycardia rhythm are
Atrial rhythm regular, ventricular rhythm irregular
P:QRS ratio of 1:1
P:QRS ratio of 2:1
Ventricular and atrial rhythm are irregular
The Correct Answer is B
A. An atrial rhythm regular and ventricular rhythm irregular would suggest an arrhythmia such as atrial fibrillation or flutter with variable conduction—not sinus tachycardia.
B. In sinus tachycardia, the rhythm is regular, the P:QRS ratio is 1:1, meaning each P wave is followed by a QRS complex, and the origin is from the sinus node.
C. A 2:1 P:QRS ratio is characteristic of certain types of heart block or atrial flutter—not sinus tachycardia.
D. Irregular ventricular and atrial rhythms are seen in atrial fibrillation or other irregular arrhythmias, not sinus tachycardia.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
A. Transcutaneous pacing may be considered if the bradycardia does not respond to initial medical management, but it is not the first intervention.
B. Administering atropine IV is the first-line treatment for symptomatic bradycardia. Atropine works by increasing heart rate through its anticholinergic effects, helping to improve cardiac output and consciousness.
C. CPR is only indicated if the client is pulseless or not breathing. Since this client is still breathing, CPR is not appropriate at this stage.
D. Cardioversion is used for certain tachyarrhythmias (e.g., atrial fibrillation with rapid ventricular response), not for bradycardia.
Correct Answer is B
Explanation
A. Blood flowing back from the left atrium to the left ventricle describes mitral regurgitation, not aortic regurgitation.
B. Aortic regurgitation involves the backflow of blood from the aorta into the left ventricle during diastole due to an incompetent aortic valve. This leads to volume overload in the left ventricle.
C. Obstruction of blood from the left atrium to the left ventricle occurs in mitral stenosis, not aortic regurgitation.
D. Obstruction of blood flow from the left ventricle is characteristic of aortic stenosis, not aortic regurgitation.
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