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 B

Explanation

B. Administering furosemide, a loop diuretic, to a patient in septic shock with low urine output could exacerbate hypovolemia and worsen organ perfusion. It could further reduce preload, exacerbating hypotension, and impairing cardiac output. Loop diuretics are typically contraindicated in hypovolemic shock.

A. Corticosteroids such as hydrocortisone can help improve vascular tone and responsiveness to vasopressors. Given the patient's clinical presentation and lack of response to initial fluid resuscitation, administering hydrocortisone is appropriate.

C. Increasing the fluid infusion rate can help restore intravascular volume and improve organ perfusion. However, caution should be exercised to avoid fluid overload and pulmonary edema.

D .Norepinephrine is a vasopressor commonly used to increase systemic vascular resistance and improve blood pressure in septic shock. It helps maintain perfusion pressure to vital organs, thereby supporting organ function.

A. Atropine B. Sodium bicarbonate C. Magnesium D. Epinephrine

Correct Answer is A

Explanation

A. Atropine is commonly used in the treatment of symptomatic bradycardia. It works by blocking vagal stimulation, leading to increased heart rate. Atropine is typically administered in doses of 0.5 to 1 mg every 3 to 5 minutes, up to a total dose of 3 mg, in patients with symptomatic bradycardia.

B. Sodium bicarbonate is not indicated for symptomatic bradycardia. It is primarily used in the management of metabolic acidosis, hyperkalemia, and certain drug overdoses. While sodium bicarbonate may be administered in specific situations during cardiopulmonary resuscitation (CPR), it is not the first-line treatment for symptomatic bradycardia.

C. Magnesium sulfate is used in the treatment of certain arrhythmias, such as torsades de pointes and refractory ventricular fibrillation or ventricular tachycardia associated with hypomagnesemia. However, it is not the first-line treatment for symptomatic bradycardia. Magnesium sulfate may be considered if there are specific indications such as torsades de pointes or suspected hypomagnesemia.

D. Epinephrine is commonly used in advanced cardiac life support (ACLS) protocols for cardiac arrest. It is not the first-line treatment for symptomatic bradycardia. Epinephrine is primarily used during CPR to improve coronary and cerebral perfusion by increasing systemic vascular resistance and heart rate.

However, in the case of symptomatic bradycardia, atropine is typically preferred as the initial medication.

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Which of the following factors can directly affect cardiac output?

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Naxlex Comprehensive Predictor Exams

Correct Answer is B

Explanation

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Correct Answer is A

Explanation

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