What criteria should the nurse use to determine normal sinus rhythm for a client on a cardiac monitor? Select all that apply.
The ST segment is higher than the PR interval.
Four complexes occur in a 6-second strip.
The RR intervals are relatively consistent.
One P wave precedes each QRS Complex.
Correct Answer : C,D
Choice A rationale:
The ST segment represents the period of time between ventricular depolarization and repolarization. Its elevation or depression can indicate myocardial ischemia or injury, but it's not directly related to normal sinus rhythm determination.
The PR interval, on the other hand, measures the time it takes for the electrical impulse to travel from the atria to the ventricles. While a normal PR interval is essential for normal sinus rhythm, its height relative to the ST segment is not a determining factor.
Choice B rationale:
The number of complexes in a 6-second strip can provide a quick estimate of heart rate, but it's not a definitive criterion for normal sinus rhythm. A normal heart rate in adults typically ranges from 60 to 100 beats per minute, which could correspond to 5-10 complexes in a 6-second strip. However, other factors, such as rhythm regularity and P wave morphology, must also be considered. Choice C rationale:
RR intervals that are relatively consistent are a hallmark of normal sinus rhythm. This indicates that the heart is beating at a regular pace, with equal time intervals between each QRS complex. In contrast, irregular RR intervals suggest dysrhythmia, such as atrial fibrillation or premature ventricular contractions.
Choice D rationale:
One P wave preceding each QRS complex is another essential feature of normal sinus rhythm. The P wave represents atrial depolarization, and its consistent presence before each QRS complex (which represents ventricular depolarization) indicates that the electrical impulse is originating in the sinoatrial (SA) node, the heart's natural pacemaker, and is propagating through the atria and ventricles in a coordinated manner.
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
Choice A rationale:
Digoxin is a medication that slows the heart rate. It would be contraindicated in this patient because they are already bradycardic.
Administering digoxin could further slow the heart rate and worsen the patient's symptoms.
Additionally, digoxin can have a negative inotropic effect, which could further compromise the patient's hemodynamic status. Choice B rationale:
While it is important to continue to monitor the patient, this is not an intervention that will address the patient's bradycardia and hypotension.
The patient is already symptomatic, and their heart rate and blood pressure are likely to continue to decline without intervention. Choice C rationale:
Defibrillation is used to treat life-threatening arrhythmias such as ventricular fibrillation and pulseless ventricular tachycardia.
It is not indicated for sinus bradycardia.
Choice D rationale:
Transcutaneous pacing is a non-invasive method of pacing the heart.
It can be used to temporarily increase the heart rate in patients with symptomatic bradycardia.
This is the most appropriate intervention for this patient because it will address the underlying problem of bradycardia and improve the patient's hemodynamic status.
Correct Answer is D
Explanation
Choice A rationale:
Assessing lung sounds is important for evaluating respiratory status, but it is not the priority assessment before administering digoxin. Digoxin does not have a direct effect on the respiratory system, and changes in lung sounds would not necessarily indicate a contraindication to its administration.
However, in patients with heart failure, which is a common indication for digoxin, auscultating lung sounds can provide valuable information about fluid status and the effectiveness of treatment. Therefore, while not the priority assessment, lung auscultation remains a relevant part of the overall assessment of a patient receiving digoxin.
Choice B rationale:
Assessing systolic blood pressure is important for monitoring hemodynamic status, but it is not the most critical assessment before administering digoxin. Digoxin does not directly affect blood pressure, and changes in blood pressure would not necessarily indicate a contraindication to its administration.
However, in patients with hypertension, which can be a factor in heart failure, monitoring blood pressure is essential for managing overall cardiovascular health. Therefore, while not the priority assessment, blood pressure measurement remains an important aspect of care for patients receiving digoxin.
Choice C rationale:
Assessing the brachial pulse for 30 seconds can provide a general assessment of heart rate and rhythm, but it is not as accurate as assessing the apical pulse for a full minute.
The apical pulse is the most reliable way to assess heart rate and rhythm, especially in patients with irregular heartbeats or those taking medications that can affect heart rate, such as digoxin.
Therefore, assessing the apical pulse for a full minute is essential to ensure accurate assessment of the patient's cardiac status before administering digoxin.
Choice D rationale:
Assessing the apical pulse for 60 seconds is the priority assessment before administering digoxin. This is because digoxin is a cardiac glycoside that affects the heart's electrical conduction system and can slow the heart rate. It is essential to assess the patient's heart rate and rhythm before administering digoxin to ensure that it is safe to do so.
A slow heart rate (bradycardia), irregular heart rhythms (such as atrial fibrillation), or certain heart block conditions can be contraindications to digoxin administration or require dosage adjustments.
By accurately assessing the apical pulse for a full minute, the nurse can identify any potential contraindications or concerns and ensure the safe administration of digoxin.
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