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What is seen on an ECG tracing when there is no electrical activity being produced?

A.

Negative waveform

B.

Isoelectric line

C.

Downward deflection

D.

Positive waveform

Answer and Explanation

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.


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Related Questions

Correct Answer is C

Explanation

A. While a splenectomy can lead to increased workload on the liver, it does not directly predispose the patient to liver disease.
B. A history of splenectomy does not specifically increase the risk of lupus.

C. Patients who have undergone splenectomy are at increased risk of certain infections, particularly encapsulated bacteria such as Streptococcus pneumoniae, which can cause pneumonia.
D. A history of splenectomy does not directly increase the risk of renal disease.

Correct Answer is B

Explanation

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.

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