A patient has been diagnosed with heart failure and cardiac output is decreased. Which formula can the nurse use to calculate cardiac output?
Ventricular filling time/diastolic filling time
Stroke volume x heart rate
Myocardial contractility x myocardial blood flow
Preload/afterload
The Correct Answer is B
A. Ventricular filling time and diastolic filling time are not formulas used to calculate cardiac output; they pertain to the phases of the cardiac cycle.
B. Cardiac output is calculated by multiplying stroke volume (the amount of blood ejected by the heart with each beat) by heart rate (the number of beats per minute). This formula accurately reflects the overall volume of blood the heart pumps in one minute.
C. Myocardial contractility and myocardial blood flow are important factors in cardiac function but do not directly provide a formula for calculating cardiac output.
D. Preload and afterload are factors that affect stroke volume but are not used to calculate cardiac output directly.
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Correct Answer is D
Explanation
A. Sequential compression devices are used to prevent deep vein thrombosis and are not relevant for assessing orthostatic hypotension.
B. Elastic stockings are used to promote venous return and prevent edema, not for measuring blood pressure.
C. A thermometer measures body temperature and does not provide information on blood pressure or orthostatic changes.
D. A blood pressure cuff is essential for assessing orthostatic hypotension. The nurse will measure blood pressure while the patient is supine, sitting, and standing to determine any significant changes that occur with position changes.
Correct Answer is D
Explanation
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B. Heart tones are not directly impacted by vancomycin and do not require immediate monitoring unless there are specific cardiovascular concerns.
C. Bowel sounds are not directly influenced by vancomycin and do not need to be prioritized in this case.
D. Vancomycin is known to be ototoxic, especially in high doses or with prolonged use, so monitoring for signs of hearing loss or tinnitus is essential to prevent potential irreversible damage.