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 B
Explanation
A. Performing movements until the patient reports pain is inappropriate in passive range of motion, as the goal is to maintain joint function without causing discomfort.
B. Moving each joint to the point of resistance helps to maintain flexibility and prevent stiffness without causing harm, making this the appropriate technique.
C. Repeating movements five times by the patient is not applicable for passive range of motion, which is performed by the nurse on a patient who cannot do it themselves.
D. While smooth movements are essential, they should not be done quickly; the focus should be on the patient's comfort and safety, avoiding rapid or jerky motions.
Correct Answer is B
Explanation
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B. Increased metabolic demands due to fever can elevate the body’s oxygen requirements, prompting hyperventilation as a compensatory mechanism.
C. Decreased drive to breathe would not lead to hyperventilation; rather, it might result in hypoventilation or respiratory distress.
D. Infection destroying lung tissues would typically lead to respiratory distress or failure, not directly cause hyperventilation without the context of increased metabolic needs.