A nurse is reviewing the ECG tracing strip of a client who is receiving telemetry monitoring.
The nurse should locate the S-T segment at which of the following locations on the electrocardiographic waveform.
The flat line between the QRS complex and the T wave.
The peak of the R wave.
The beginning of the P wave.
The interval between the S wave and the T wave.
The Correct Answer is A
Choice A rationale
The ST segment represents the time from the end of ventricular depolarization to the beginning of ventricular repolarization. It is identified as the flat baseline following the QRS complex and preceding the T wave. This segment is isoelectric, meaning it's at the same level as the PR segment, and any deviation can indicate myocardial ischemia or injury.
Choice B rationale
The peak of the R wave represents the peak of ventricular depolarization. It signifies the moment of maximum electrical activity in the ventricles, as the impulse spreads through the ventricular walls. It is a critical point in the QRS complex, but it is not the location of the ST segment.
Choice C rationale
The beginning of the P wave marks the onset of atrial depolarization. This electrical event represents the contraction of the atria as they pump blood into the ventricles. The P wave is the first deflection in the cardiac cycle and occurs well before the QRS complex and the ST segment.
Choice D rationale
The interval between the S wave and the T wave is not a standard electrocardiographic term. The correct terminology is the ST segment, which is a segment, not an interval, and it specifically follows the S wave and precedes the T wave. An interval would typically include a wave, like the QT interval. *.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
Choice A rationale
This statement is dismissive of the client's concern and incorrectly implies that medication is a required part of rest and recovery. The client has the right to refuse medication, and this statement does not address their fears about being forced to take drugs. Providing false reassurance or being dismissive can damage the therapeutic nurse-client relationship and increase the client's anxiety.
Choice B rationale
This is an inappropriate response as it places the burden of explanation on the client and can be perceived as an accusatory question. Therapeutic communication requires the nurse to validate the client's feelings and provide accurate information, not to question their rationale.
The nurse should address the client's fear directly and reassure them about their rights.
Choice C rationale
This statement is correct because it upholds the client's rights. Under involuntary admission, a client retains the right to refuse psychotropic medication unless a court order has been obtained or there is an emergency situation where the client is a danger to themselves or others. The nurse's statement respects the client's autonomy and provides accurate information about their legal rights.
Choice D rationale
This statement is legally and ethically incorrect. Even with an involuntary admission, a client retains their fundamental rights, including the right to refuse treatment. Forcing a client to accept treatment against their will is a violation of their autonomy and can only be done in specific, legally defined circumstances, such as an emergency or through a court order. This response is coercive and non-therapeutic. *.
Correct Answer is D
Explanation
Choice A rationale
Dark spots or floaters in vision are not a typical post-operative finding for cataract removal. They are more commonly associated with retinal detachment, which is a rare but serious complication. The client should be instructed to report this to the provider immediately.
Choice B rationale
Bruising of the eyelids is not a normal or expected outcome after cataract surgery. The procedure is typically performed with a small incision and does not cause significant trauma to the surrounding tissues, making bruising an uncommon occurrence.
Choice C rationale
Cataract surgery is almost always performed using a local anesthetic, not general anesthesia. A local anesthetic is administered to numb the eye and surrounding area, allowing the client to remain awake and aware during the procedure while feeling no pain.
Choice D rationale
The fundamental principle of cataract surgery is the removal of the clouded, opaque lens and its replacement with a clear, artificial intraocular lens (IOL). This is the definitive treatment for cataracts, restoring visual clarity and function to the eye. *.
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