What is the primary mechanism for maintaining constant cerebral blood flow despite changes in systemic blood pressure?
AEndothelial factors
BBaroreceptor reflex
CMyogenic autoregulation
DMetabolic control
Which of the following physiologic changes decreases pulmonary vascular resistance (PVR)?
AInhaling the inspiratory reserve volume (IRV)
BExhaling the entire vital capacity (VC)
CExhaling the expiratory reserve volume (ERV)
DBreath holding maneuver at functional residual capacity (FRC)
EInhaling the entire vital capacity (VC)
A 57-year-old man is admitted to the burn unit after he was brought to the emergency room following an accidental fire in his house. His past medical history is unknown due to his current clinical condition. Currently, his blood pressure is 75/40 mmHg, pulse rate is 140/min, and respiratory rate is 17/min. The patient is subsequently intubated and started on aggressive fluid resuscitation. A Swan-Ganz catheter is inserted to clarify his volume status. Which of the following hemodynamic parameters would you expect to see in this patient?
ACardiac output: ↓, systemic vascular resistance: ↔, pulmonary artery wedge pressure: ↔
BCardiac output: ↑, systemic vascular resistance: ↑, pulmonary artery wedge pressure: ↔
CCardiac output: ↑, systemic vascular resistance: ↓, pulmonary artery wedge pressure: ↔
DCardiac output: ↓, systemic vascular resistance: ↑, pulmonary artery wedge pressure: ↓
ECardiac output: ↔, systemic vascular resistance: ↔, pulmonary artery wedge pressure: ↔
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