What is seen on an ECG tracing when there is no electrical activity being produced?
Negative waveform
Isoelectric line
Downward deflection
Positive waveform
The Correct Answer is B
A. A negative waveform indicates a downward deflection from the baseline on an ECG tracing, which may correspond to electrical activity such as depolarization or repolarization of cardiac chambers.
B. An isoelectric line represents the baseline on an ECG tracing when there is no net electrical activity occurring in the heart. It appears flat and represents a period of electrical silence.
C. A downward deflection on an ECG tracing refers to a negative waveform, as mentioned above.
D. A positive waveform on an ECG tracing indicates an upward deflection from the baseline, representing electrical activity such as depolarization or repolarization.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
A. The QRS interval may vary but is typically less than 0.12 seconds in normal sinus rhythm.
B. Normal sinus rhythm typically has a heart rate between 50 and 100 beats per minute.
C. In normal sinus rhythm, P waves are typically upright and precede each QRS complex.
D. The PR interval may vary but is typically between 0.12 and 0.20 seconds in normal sinus rhythm.
Correct Answer is B
Explanation
A. While controlling carbohydrate intake may be beneficial for managing blood glucose levels in some cases, it is not a primary dietary concern for chronic kidney disease.
B. Patients with chronic kidney disease often need to limit potassium intake because the kidneys may have difficulty excreting excess potassium, leading to hyperkalemia.
C. While protein restriction may be necessary in advanced stages of chronic kidney disease to reduce the workload on the kidneys, complete elimination of protein is not recommended.
D. Sodium restriction is often recommended for patients with chronic kidney disease to help control blood pressure and fluid balance.
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