What is the main hemodynamic parameter that measures preload?
Systolic Blood Pressure.
Mean Arterial Blood Pressure.
Central Venous Pressure (CVP).
Systemic Vascular Resistance.
The Correct Answer is C
Choice A reason: Systolic Blood Pressure is not a direct measure of preload; it indicates the pressure in the arteries during the contraction of the heart muscles.
Choice B reason: Mean Arterial Blood Pressure is an average blood pressure in an individual during a single cardiac cycle, but it does not specifically measure preload.
Choice C reason: Central Venous Pressure (CVP) is a direct measure of the blood volume returning to the heart and the ability of the heart to pump the blood into the arterial system, making it a key indicator of preload.
Choice D reason: Systemic Vascular Resistance refers to the resistance to blood flow offered by all of the systemic vasculature, excluding the pulmonary vasculature, and is not a measure of preload.
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
Choice A reason: An RBC count of 4,500,000/mL is within the normal range and would not typically cause symptoms of anemia.
Choice B reason: Normal RBC indices do not indicate anemia and would not explain the symptoms.
Choice C reason: A hemoglobin level of 8.2 g/dL is below the normal range and would be consistent with symptoms of anemia such as fatigue and palpitations.
Choice D reason: A hematocrit of 38% is within the normal range for adult males and would not typically be associated with anemia symptoms.
Correct Answer is C
Explanation
Choice A reason: Stopping seizure medication such as phenytoin without medical advice can lead to life-threatening seizures. It is not recommended to stop after a set period of being seizure-free without consulting a healthcare provider.
Choice B reason: Phenytoin should not be taken only during periods of stress; it is intended to be used consistently to maintain therapeutic levels in the body.
Choice C reason: Phenytoin may need to be continued indefinitely, depending on the individual's condition and the doctor's recommendation. It is often used as a long-term treatment for seizure control.
Choice D reason: This statement is misleading; while phenytoin helps control seizures, it does not cure the underlying condition causing them.
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