Which of the following ECG rhythm interval measures is considered abnormal?
QTc interval 0.33 to 0.47 seconds
QT interval that varies with HR
QRS interval <0.12 seconds
PR interval 0.12 to 0.24 seconds
The Correct Answer is A
The QTc (corrected QT) interval is a measure of the time it takes for the ventricles to depolarize and repolarize during a cardiac cycle. It is corrected for heart rate (HR) to account for variations in the cardiac cycle length.
The normal range for the QTc interval varies depending on the calculation method used but generally falls within 0.36 to 0.44 seconds. In the given options, the range of 0.33 to 0.47 seconds for the QTc interval is wider than the normal range, suggesting a prolonged QTc interval, which can be indicative of a potential risk for arrhythmias, including ventricular tachycardia and torsades de pointes.
B. QT interval that varies with HR in (option B) is normal because The QT interval alone can vary with heart rate, and this is considered a normal physiological adaptation.
C. QRS interval <0.12 seconds in (option C) is normal because The QRS interval represents the time it takes for ventricular depolarization and is normally less than 0.12 seconds.
D. PR interval 0.12 to 0.24 seconds in (option D) is normal because The PR interval represents the time it takes for atrial depolarization and conduction through the AV node. The normal range is typically 0.12 to 0.20 seconds.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
Septic shock is a life-threatening condition characterized by severe infection, systemic inflammation, and inadequate tissue perfusion. Hypotension, as indicated by a low blood pressure reading, is a significant concern in septic shock. It reflects inadequate perfusion to vital organs and tissues, leading to potential organ dysfunction and damage.
While all the assessment data provided may be important and require attention, the low blood pressure (BP) reading indicates impaired systemic perfusion and can contribute to end-organ damage. The nurse should prioritize interventions aimed at improving perfusion and stabilizing the patient's blood pressure.
A. Arterial oxygen saturation is 90% in (option A) is incorrect because While an arterial oxygen saturation of 90% is below the desired range, it is not as immediately life-threatening as low blood pressure. Oxygen therapy and interventions to improve oxygenation should still be initiated, but addressing hypotension takes priority.
B. Urine output of 15 ml for 2 hours in (option B) is incorrect because Decreased urine output is a concerning sign, as it may indicate impaired renal perfusion. However, the immediate concern in septic shock is addressing the low blood pressure to improve overall perfusion, including renal perfusion.
C. Apical pulse 110 beats/min in (option C) is incorrect because: Tachycardia is a common finding in septic shock and represents the body's compensatory response to maintain cardiac output. While it requires monitoring and consideration, low blood pressure is a more significant concern.
Correct Answer is ["21"]
Explanation
flow rate for an infusion= (Volume in mL * Drop factor) / Time in minutes.
volume of the infusion bag is 250 mL, the drop factor is 10 gtts/mL, and the time is 2 hours, which is 120 minutes.
(250 mL * 10 gtts/mL) / 120 minutes = 2500 gtts / 120 minutes ≈ 20.83 gtts/minute. Therefore, the nurse should run the infusion at a rate of approximately 21 drops per minute to deliver 1 unit of packed red blood cells over the 2-hour period.
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