The nurse needs to estimate quickly the heart rate of a patient with a regular heart rhythm. Which method will be best to use?
Print a 1-minute electrocardiogram (ECG) strip and count the number of QRS complexes.
Calculate the number of small squares between one QRS complex and the next and divide it into 1500.
Use the 3-second markers to count the number of QRS complexes in 6 seconds and multiply by 10.
Count the number of large squares in the R-R interval and divide by 300.
The Correct Answer is C
This method, known as the 6-second method, involves counting the number of QRS complexes in a 6-second interval on the electrocardiogram (ECG) strip and then multiplying that number by 10 to calculate the heart rate per minute. The advantage of this method is that it provides a relatively quick estimate of the heart rate.
A. Printing a 1-minute ECG strip and counting the number of QRS complexes in (option A) is incorrect because it can be time-consuming and may not be practical in situations where a quick estimate is needed.
B. Calculating the number of small squares between one QRS complex and the next and dividing into 1500 in (option B) is incorrect because it is a method used to calculate heart rate, known as the "1500 method," but it is not as quick as the 6-second method and requires more time and measurement precision.
D. Counting the number of large squares in the R-R interval and dividing by 300 is another method used to calculate heart rate, known as the "300 method," but it is also less quick and less accurate for assessing heart rate in patients with regular rhythms.
It's important to note that if the heart rhythm is irregular, these methods may not provide an accurate estimate of the heart rate, and a longer monitoring period or a different approach may be necessary.
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 B
Explanation
Shock is a state of inadequate tissue perfusion, resulting in compromised oxygen and nutrient delivery to cells and impaired cellular metabolism. Regardless of the specific cause or type of shock (e.g., hypovolemic, cardiogenic, distributive), the underlying problem is the failure to supply sufficient oxygen and nutrients to the body's tissues. This inadequate tissue perfusion can lead to cellular dysfunction, organ failure, and ultimately, life-threatening consequences.
A. Inefficient metabolism resulting from inadequate nutrition in (option A) is incorrect because While inadequate nutrition can contribute to the overall health status and resilience of an individual, it is not the central mechanism underlying all shock states.
C. Vasoconstriction and reflexive vasodilation due to circulating mediators in (option C) is incorrect because Vasoconstriction and vasodilation are physiological responses that can occur in various types of shock, but they are not the fundamental common denominator. Inadequate tissue perfusion remains the core issue.
D. Hypovolemia resulting from blood loss in (option D) is incorrect because Hypovolemia, which refers to decreased blood volume, is one potential cause of shock, specifically hypovolemic shock. However, other types of shock, such as cardiogenic or distributive shock, may not be primarily characterized by hypovolemia.
Therefore, the common denominator of all shock states is inadequate tissue perfusion, resulting in impaired cellular metabolism.
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