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. A 3-mL syringe is not appropriate for administering U-500 insulin, as the concentration may not allow for accurate dosing at such a small volume.
B. A U-100 syringe is designed for U-100 insulin and would not provide accurate measurement for U-500 insulin.
C. A needleless syringe may be useful in certain contexts, but it does not specifically provide the necessary precision for insulin dosage.
D. A tuberculin syringe is suitable for administering small doses (like 0.3 mL) and provides more accurate measurement for high-concentration insulin such as U-500.
Correct Answer is A
Explanation
A. "Readiness for enhanced urinary elimination" is classified as a health promotion diagnosis, indicating the patient’s desire to improve their health condition and adopt new health behaviors.
B. A risk diagnosis is used when there is a potential for problems to occur, not applicable in this scenario as the patient is actively seeking improvement.
C. A problem-focused diagnosis describes an existing problem that requires intervention; this situation reflects readiness for improvement, not an existing issue.
D. A collaborative problem involves potential complications that require both nursing and medical management; this case focuses on the patient's willingness to learn a self-management skill rather than managing a specific medical problem.