The nurse understands that which hemodynamic parameters are consistent with hypovolemic shock? Decreased cardiac output and:
Decreased systemic vascular resistance, decreased CVP.
Increased systemic vascular resistance, decreased CVP.
Increased systemic vascular resistance, increased CVP.
Decreased systemic vascular resistance, increased CVP.
The Correct Answer is B
Choice A reason: Decreased systemic vascular resistance, decreased CVP. In hypovolemic shock, the body compensates by increasing systemic vascular resistance to maintain blood pressure. Therefore, decreased systemic vascular resistance is not consistent with hypovolemic shock. Central venous pressure (CVP) would be low due to reduced blood volume.
Choice B reason: Increased systemic vascular resistance, decreased CVP. Hypovolemic shock is characterized by low blood volume, leading to decreased cardiac output and low CVP. The body compensates by increasing systemic vascular resistance to maintain blood pressure, making this the correct answer.
Choice C reason: Increased systemic vascular resistance, increased CVP. While systemic vascular resistance increases, CVP is typically decreased in hypovolemic shock due to the lack of circulating blood volume.
Choice D reason: Decreased systemic vascular resistance, increased CVP. Decreased systemic vascular resistance and increased CVP are not consistent with hypovolemic shock. These parameters might be seen in conditions with different hemodynamic profiles.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
Choice A reason: Stroke volume x heart rate. Cardiac output is the volume of blood the heart pumps per minute, calculated by multiplying the stroke volume (the amount of blood ejected with each heartbeat) by the heart rate (the number of beats per minute).
Choice B reason: Afterload x preload. Afterload and preload are important factors influencing cardiac function but do not directly calculate cardiac output. Afterload refers to the resistance the heart must overcome to eject blood, and preload refers to the initial stretching of the heart muscle prior to contraction.
Choice C reason: Ejection fraction x blood pressure. Ejection fraction is a measure of the percentage of blood ejected from the heart with each beat, and blood pressure is the force exerted by circulating blood on the walls of blood vessels. These factors influence cardiac function but do not directly calculate cardiac output.
Choice D reason: Systolic x diastolic BP. Systolic and diastolic blood pressure are measurements of pressure during heartbeats and between beats, respectively. They are not used to calculate cardiac output.
Correct Answer is B
Explanation
Choice A reason: Respiratory acidosis. Respiratory acidosis occurs when there is inadequate ventilation, leading to increased carbon dioxide levels in the blood. Hyperventilation would not cause respiratory acidosis.
Choice B reason: Respiratory alkalosis. Hyperventilation results in excessive expulsion of carbon dioxide, leading to a decrease in carbonic acid levels in the blood. This causes respiratory alkalosis, which is expected in the early stages of hypovolemic shock as the body attempts to compensate for decreased oxygen delivery.
Choice C reason: Metabolic acidosis. Metabolic acidosis results from an accumulation of acid or loss of bicarbonate in the body. It is typically seen in the later stages of shock when lactic acid builds up due to anaerobic metabolism.
Choice D reason: Metabolic alkalosis. Metabolic alkalosis occurs due to an excessive loss of acids (e.g., through vomiting) or an accumulation of bicarbonate. Hyperventilation does not cause metabolic alkalosis.
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