Which of the following is NOT an appropriate indication for the use of dopamine in critical care?
Hypotension due to neurogenic shock
Hypotension due to septic shock
Hypotension due to hypovolemic shock
Hypotension due to cardiogenic shock
The Correct Answer is C
C. its use in hypovolemic shock is generally not appropriate because the primary treatment for hypovolemic shock is fluid resuscitation to address the volume loss.
A. Dopamine is often used in neurogenic shock to increase systemic vascular resistance and improve blood pressure. Therefore, dopamine is an appropriate choice for the management of hypotension due to neurogenic shock.
B. Dopamine is commonly used in septic shock to improve cardiac output and systemic vascular resistance. It helps to support blood pressure and perfusion in septic shock patients.
D. It is indicated for cardiogenic shock as it increases cardiac contractility.
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Related Questions
Correct Answer is B
Explanation
B. Right-sided heart failure leads to congestion of the systemic venous circulation, resulting in increased central venous pressure (CVP). Elevated CVP is a hallmark sign of right-sided heart failure and is often used clinically to assess right ventricular preload and volume status.
A. BNP is a hormone secreted by the heart in response to increased ventricular stretch and volume overload, and its levels are usually elevated in heart failure, including both left-sided and right-sided heart failure.
C. Specific gravity refers to the concentration of solutes in urine and is often used as a measure of urine concentration.
D. Pulmonary artery wedge pressure (PAWP) is a measure of left atrial pressure and left ventricular end- diastolic pressure. In right-sided heart failure, the primary hemodynamic abnormality is congestion of the systemic venous circulation, rather than elevated left-sided pressures.
Correct Answer is C
Explanation
C. Mean arterial pressure (MAP) reflects the average pressure in the arteries during one cardiac cycle and is an important indicator of tissue perfusion. A MAP of 56 mm Hg is below the normal range (typically >60 mm Hg) and may indicate inadequate tissue perfusion. While norepinephrine is commonly used to increase blood pressure and improve tissue perfusion in hypotensive patients, a MAP of 56 mm Hg suggests that the current infusion rate may not be sufficient to maintain adequate perfusion, and adjusting the infusion rate may be warranted.
A. Norepinephrine is a vasopressor medication primarily used to increase blood pressure in patients with hypotension or shock. A low pulmonary artery wedge pressure (PAWP) suggests decreased preload, which may indicate hypovolemia or inadequate fluid resuscitation. In this case, adjusting the norepinephrine infusion rate may not be necessary, but rather addressing the underlying cause of hypovolemia or inadequate preload.
B. Systemic vascular resistance (SVR) represents the resistance the heart must overcome to pump blood into the systemic circulation. An elevated SVR may suggest vasoconstriction, which could be a desired effect of norepinephrine infusion to increase blood pressure. Therefore, an elevated SVR may not necessarily indicate a need to adjust the norepinephrine infusion rate, as it may reflect the medication's intended action.
D. Norepinephrine primarily acts on alpha-adrenergic receptors to increase blood pressure by inducing vasoconstriction. While it may cause reflex bradycardia due to increased systemic vascular resistance, a heart rate of 58 beats/min may be within an acceptable range depending on the patient's clinical condition and baseline heart rate. Therefore, a slow heart rate alone may not necessarily indicate a need to adjust the norepinephrine infusion rate unless it is associated with signs of inadequate tissue perfusion or other concerning symptoms.
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