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. While the patient may have been in a life-threatening situation, this point is not necessarily a direct indictment of the nurse’s actions but rather a justification for performing CPR.
B. The prosecution will likely focus on whether the CPR was performed according to accepted standards of care. If it can be shown that the technique was inappropriate or negligent, this would support the claim of malpractice.
C. Performing CPR according to policy may serve as a defense for the nurse, emphasizing adherence to established protocols.
D. While it is true that older adults with brittle bones may be at risk for fractures, this is a known risk of CPR, and the prosecution will aim to demonstrate specific negligence or failure in technique rather than just acknowledging inherent risks.
Correct Answer is C
Explanation
A. Atelectasis can occur in anyone, not just those with chronic conditions; this statement is incorrect.
B. While hyperventilation may temporarily open alveoli, it is not a preventative measure for atelectasis.
C. Breathing exercises, such as incentive spirometry or deep breathing, are effective in preventing atelectasis by promoting lung expansion and alveolar ventilation.
D. A chest tube is typically used to remove air or fluid from the pleural space, not for the treatment of atelectasis, which is often managed with respiratory therapies.