Which of the following statements best describes the pathophysiologic rationale for shock?
Circulating blood volume is decreased.
Cells lack an adequate blood supply and are deprived of oxygen and nutrients.
Hemorrhage occurs as a result of trauma.
Blood is shunted from vital organs to peripheral areas of the body.
The Correct Answer is B
A. Circulating blood volume is decreased – This is true specifically in hypovolemic shock, but it does not apply to all types of shock (e.g., septic or cardiogenic shock).
B. Cells lack an adequate blood supply and are deprived of oxygen and nutrients – This is the most accurate and comprehensive description of the pathophysiology of shock. Shock is defined as a state of cellular and tissue hypoperfusion, regardless of the underlying cause.
C. Hemorrhage occurs as a result of trauma – While hemorrhage can cause hypovolemic shock, it is not the universal cause of all types of shock.
D. Blood is shunted from vital organs to peripheral areas of the body – The opposite is true in shock: blood is typically shunted away from peripheral tissues to preserve perfusion to vital organs like the brain and heart.
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A. The presence of prosthetic heart valves is a significant risk factor for infective endocarditis due to the increased likelihood of bacterial colonization.
B. Sedentary lifestyle is not a direct risk factor for infective endocarditis, though it may contribute to other cardiovascular issues.
C. Radiation exposure – While it may affect cardiac tissue, it is not considered a risk factor for infective endocarditis.
D. Cardiac catheterization – While it is an invasive procedure, it is not a major or common risk factor for infective endocarditis compared to prosthetic valves or structural heart defects.
Correct Answer is B
Explanation
A. Spinal cord perfusion is not monitored with a pulmonary artery catheter; it typically requires different neuromonitoring techniques.
B. Hemodynamic status is accurately monitored using a pulmonary artery catheter (also called a Swan-Ganz catheter), which provides information on cardiac output, pulmonary artery pressures, and other cardiovascular parameters.
C. Intracranial pressure is monitored using devices like an intraventricular catheter or subarachnoid bolt, not a pulmonary artery catheter.
D. Renal function is assessed through laboratory tests (e.g., BUN, creatinine) and urine output, not via a pulmonary artery catheter
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