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 ["C","D","E"]
Explanation
A. Digoxin typically decreases the heart rate by increasing vagal tone and reducing conduction through the atrioventricular node.
B. Digoxin may have minimal effects on blood pressure, primarily by improving cardiac output in patients with heart failure, but its primary action is on cardiac contractility and rhythm.
C. Digoxin has a negative chronotropic effect, meaning it slows the heart rate by increasing parasympathetic tone and decreasing conduction through the atrioventricular node.
D. Digoxin has a positive inotropic effect, meaning it increases the force of cardiac contractions, which can be beneficial in patients with heart failure.
E. Digoxin can suppress ectopic beats (abnormal heart rhythms originating outside the sinoatrial node) by slowing conduction through the atrioventricular node and enhancing vagal tone
Correct Answer is ["B","C","D","E","G","H"]
Explanation
A. Polycythemia (an abnormally high red blood cell count) is not typically a primary concern in dialysis patients; instead, they are more often monitored for anemia.
B. Dialysis patients often need to restrict fluid intake to prevent fluid overload, which can exacerbate edema and cause additional cardiovascular strain.
C. Daily weight monitoring is crucial for dialysis patients to track fluid balance and detect any sudden changes that might indicate fluid retention or loss.
D. Frequent oral care is important to prevent infections, particularly because dialysis patients are at increased risk due to their compromised immune systems and possible fluid restrictions, which can lead to dry mouth and other oral health issues.
E. Dialysis patients may need a modified protein intake, depending on their specific needs and the type of dialysis (hemodialysis vs. peritoneal dialysis). Protein needs can vary, so it is essential to follow the specific dietary recommendations provided by a healthcare provider.
F. Avoiding nephrotoxic substances (e.g., certain medications, contrast dyes) is critical to protect the remaining kidney function and prevent further damage.
G. A low-sodium diet helps manage blood pressure and fluid balance, reducing the risk of fluid retention and hypertension in dialysis patients.
H. Monitoring urine output is important to assess kidney function and fluid balance.
Even though dialysis takes over some kidney functions, any remaining urine output can provide valuable information about the patient's residual kidney function.
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