A 44-year-old man is brought to the emergency department after sustaining high-voltage electrical burns over his left upper limb. On examination, the tip of his left middle finger is charred, and there are 2nd-degree burns involving the whole of the left upper limb. Radial and ulnar pulses are strong, and there are no signs of compartment syndrome. An exit wound is present over the sole of his right foot. His temperature is 37.7°C (99.8°F), the blood pressure is 110/70 mm Hg, the pulse is 105/min, and the respiratory rate is 26/min. His urine is reddish-brown, and urine output is 0.3 mL/kg/h. Laboratory studies show: Hemoglobin 13.9 g/dL Hematocrit 33% Leukocyte count 11,111/mm3 Serum Creatinine 4.6 mg/dL Creatine phosphokinase 15,230 U/L K+ 7.7 mEq/L Na+ 143 mEq/L What is the most likely mechanism for this patient's renal failure?
ASepticemia leading to acute pyelonephritis
BRhabdomyolysis, myoglobinuria, and renal injury
CDirect visceral electrical injury to the kidneys
DFluid and electrolyte loss and hypovolemia
EVolume overload because of excessive intravenous fluid resuscitation
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: ↔
An 83-year-old male presents with dyspnea, orthopnea, and a chest radiograph demonstrating pulmonary edema. A diagnosis of congestive heart failure is considered. The following clinical measurements are obtained: 100 bpm heart rate, 0.2 mL O2/mL systemic blood arterial oxygen content, 0.1 mL O2/mL pulmonary arterial oxygen content, and 400 mL O2/min oxygen consumption. Using the above information, which of the following values represents this patient's cardiac stroke volume?
A30 mL/beat
B70 mL/beat
C40 mL/beat
D60 mL/beat
E50 mL/beat
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