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What is the cardiac output of a patient whose heart rate is 72 beats per minute with a stroke volume of 90 mL/contraction?

18 Ml

5480 Ml

6,480 mL

4234 mL

Answer and Explanation

The Correct Answer is C

Heart rate: 72 beats per minute Stroke volume: 90 mL/contraction

Cardiac output = Heart rate × Stroke volume

Cardiac output = 72 beats/minute × 90 mL/contraction

To simplify the calculation, you can convert the units:

72 beats/minute × 90 mL/contraction = (72 × 90) beats/minute × mL/contraction

Now, perform the multiplication:

72 × 90 = 6,480

Therefore, the cardiac output is 6,480 mL per minute.

The correct answer is:

C. 6,480 mL

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Correct Answer is B

Explanation

Lactate is a by-product of anaerobic metabolism that accumulates when there is insufficient oxygen supply to meet cellular metabolic demands. In the context of severe tissue hypoxia, such as in septic shock, the body may resort to anaerobic metabolism, leading to increased lactate production and elevated lactate levels in the blood.
Elevated lactate levels, typically above 4.0 mmol/L, are indicative of tissue hypoxia and inadequate oxygenation at the cellular level. Higher lactate levels, such as 9.0 mmol/L, suggest more severe tissue hypoxia and increased anaerobic metabolism.
A. Partial thromboplastin time (PTT) 64 seconds in (option A) is incorrect because: PTT is a laboratory test that evaluates the intrinsic pathway of the coagulation cascade. While coagulation abnormalities may occur in septic shock, PTT alone does not specifically indicate severe tissue hypoxia.
C. Potassium 2.8 mEq/L (2.8 mmol/L) (option C) is incorrect because Low potassium levels (hypokalemia) can be a concern in septic shock, but it does not directly indicate severe tissue hypoxia.
D. PaCO2 58 mm Hg in (option D) is incorrect because: PaCO2 refers to the partial pressure of carbon dioxide in arterial blood and is a measure of the respiratory status. While an elevated PaCO2 can be a sign of respiratory acidosis, it is not specific to severe tissue hypoxia.
Therefore, in a critically ill patient with septic shock, an elevated lactate level, such as 9.0 mmol/L, indicates severe tissue hypoxia and inadequate oxygenation at the cellular level

Correct Answer is ["21"]

Explanation

flow rate for an infusion= (Volume in mL * Drop factor) / Time in minutes.

volume of the infusion bag is 250 mL, the drop factor is 10 gtts/mL, and the time is 2 hours, which is 120 minutes.

(250 mL * 10 gtts/mL) / 120 minutes = 2500 gtts / 120 minutes ≈ 20.83 gtts/minute. Therefore, the nurse should run the infusion at a rate of approximately 21 drops per minute to deliver 1 unit of packed red blood cells over the 2-hour period.

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What is the cardiac output of a patient whose heart rate is 72 beats per minute with a stroke volume of 90 mL/contraction?

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Naxlex Comprehensive Predictor Exams

How does the emergency department nurse caring for a critically ill with septic shock recognize that severe tissue hypoxia is present?

Correct Answer is B

Explanation

Correct Answer is ["21"]

Explanation

The cardiac ICU nurse is assessing a patient who is in cardiogenic shock. Which hemodynamic manifestations and/or signs and symptoms do the nurse expect? Select all that apply.

The ICU charge nurse will evaluate that teaching about hemodynamic monitoring for a new staff nurse has been effective when the new nurse does which of the following?

Which of the following clinical manifestations is NOT considered part of Beck's triad (classic indications of cardiac tamponade)?

Which of the following findings is most consistent with disseminated intravascular coagulation (DIC)?

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