Which of the following factors can directly affect cardiac output?

Respiratory rate

Stroke volume

Heart rate

Blood pressure

Answer and Explanation

Correct Answer : B,C

B. stroke volume is the amount of blood ejected from the left ventricle with each contraction (systole) of the heart. Changes in stroke volume directly affect cardiac output. An increase in stroke volume leads to an increase in cardiac output, while a decrease in stroke volume results in a decrease in cardiac output. Factors that can affect stroke volume include preload, afterload, and contractility of the heart.

C. Heart rate refers to the number of heartbeats per minute. Heart rate directly affects cardiac output by determining how frequently the heart contracts and pumps blood. An increase in heart rate (tachycardia) leads to an increase in cardiac output, while a decrease in heart rate (bradycardia) results in a decrease in cardiac output. Factors such as sympathetic and parasympathetic nervous system activity, hormones, and medications can influence heart rate.

A. Respiratory rate does not directly affect stroke volume or heart rate but changes in respiratory rate can indirectly impact cardiac output through their effects on venous return and preload.

D. Blood pressure represents the force exerted by the blood against the walls of the arteries. While blood pressure does not directly affect cardiac output, it is influenced by cardiac output and systemic vascular resistance (SVR).

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Correct Answer is C

Explanation

C. Amiodarone is a Class III antiarrhythmic medication commonly used for the acute management of atrial fibrillation with a rapid ventricular rate. It works by blocking multiple ion channels, prolonging the action potential duration, and slowing conduction in the atria and ventricles. Amiodarone is often used when other interventions such as vagal maneuvers or beta blockers are ineffective or contraindicated. In this scenario, where the patient is hypotensive and symptomatic, intravenous amiodarone may be administered to control the ventricular rate and stabilize hemodynamics

A. Bearing down, or the Valsalva maneuver, is a vagal maneuver that can sometimes help slow the heart rate in certain arrhythmias by increasing parasympathetic tone. However, it may not be effective or safe in all situations, especially if the patient is hypotensive or confused. In this scenario, immediate pharmacological intervention is likely needed to control the heart rate and stabilize hemodynamics.

B. Lidocaine is not typically used to treat atrial fibrillation with a rapid ventricular rate. Lidocaine is a Class IB antiarrhythmic medication primarily used for the treatment of ventricular arrhythmias, such as ventricular tachycardia and ventricular fibrillation. It is not considered a first-line agent for atrial fibrillation and may not effectively control the ventricular rate in this situation.

D. While beta blockers are commonly used for rate control in atrial fibrillation, they may not be the best choice in this scenario where the patient is hypotensive and symptomatic. Beta blockers can further decrease blood pressure and exacerbate hypotension, especially in patients with compromised hemodynamics. In such cases, other rate-controlling agents like calcium channel blockers or amiodarone may be preferred.

A. Isosorbide PO B. Nitroglycerin Drip C. Dopamine drip D. Normal Saline Bolus

Correct Answer is D

Explanation

D Normal saline bolus administration is indicated for hypovolemia or inadequate intravascular volume, which can lead to decreased cardiac output and hypotension. In this scenario, the client has an amber urine output of 45ml in the last 3 hours, indicating decreased urine output and potential hypovolemia. The elevated blood pressure (170/67 mmHg) suggests possible volume overload or fluid retention, but the decreased urine output raises concerns for inadequate intravascular volume. Therefore, administering a normal saline bolus may be the first priority to optimize intravascular volume and improve cardiac output.

A Isosorbide mononitrate is a vasodilator commonly used in the treatment of heart failure and angina. It helps reduce preload and afterload, thereby decreasing the workload on the heart. However, in this scenario, the client's blood pressure is elevated (170/67 mmHg), and there is no indication of acute decompensation or pulmonary congestion. Therefore, isosorbide PO may not be the first priority medication at this time.

B Nitroglycerin is a potent vasodilator commonly used to manage acute heart failure exacerbations and acute coronary syndromes. It helps reduce preload and afterload, improving cardiac output and relieving symptoms of heart failure. In this scenario, the client's blood pressure is elevated, but the heart rate is normal, and there are no signs of acute decompensation. Therefore, initiating a nitroglycerin drip may not be the first priority unless the client develops symptoms of acute decompensation or pulmonary congestion.

C Dopamine is a vasopressor medication that can be used to increase blood pressure and cardiac output in patients with hypotension or shock. However, in this scenario, the client's blood pressure is elevated (170/67 mmHg), and there is no evidence of hypotension. Therefore, initiating a dopamine drip may not be appropriate at this time and could potentially exacerbate hypertension.

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Which of the following factors can directly affect cardiac output?

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Naxlex Comprehensive Predictor Exams

A nurse is caring for a client who was admitted for atrial fibrillation rapid ventricular rate of 130 beat/min with confusion. The client's blood pressure is 87/50. What order should the nurse expect to receive from the provider?

Correct Answer is C

Explanation

The nurse is caring for a client who has heart failure with an EF of 40%. The client has a BP of 170/67 with an HR of 60. He currently is in normal sinus rhythm and has an amber urine output of 45ml in the last 3 hours. Which medication would the nurse expect to give first?

Correct Answer is D

Explanation

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