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 ["A","B","C","D"]
Explanation
A. A patient with an indwelling catheter requires regular perineal care to prevent infection due to increased risk from the catheter.
B. Urinary and fecal incontinence increase the risk of skin breakdown and infection, necessitating frequent perineal care.
C. Surgical dressings in the rectal and genital areas require perineal care to maintain hygiene and prevent wound contamination.
D. Bariatric patients often need regular perineal care due to skin folds and increased risk of moisture-related skin breakdown.
E. A circumcised, ambulatory male typically has a lower risk of infection and may not require as frequent perineal care unless other factors are present.
Correct Answer is C
Explanation
A. Elevated blood pressure may occur with various conditions but is not a specific late sign of hypoxia.
B. An increased pulse rate can be an early compensatory response to hypoxia rather than a late sign.
C. Cyanosis, which is a bluish discoloration of the skin and mucous membranes, is a classic late sign of hypoxia, indicating severe oxygen deprivation.
D. Restlessness may indicate early signs of hypoxia or anxiety rather than a late sign and can occur before cyanosis develops.