10 Random Questions
Monitoring of a patient with a closed head injury shows the following pressures: Intracranial pressure 30 mmHg, Central venous pressure 5 mmHg, Mean arterial pressure 65 mmHg, Peak airway pressure 25 cmH,0. The cerebral perfusion pressure is
- (A) 30 mmHg
- (B) 35 mmHg
- (C) 40 mmHg
- (D) 60 mmHg
- (E) 65 mmHg
Which of the following is an effect of metoclopramide?
- (A) Decreased lower esophageal sphincter tone
- (B) Decreased MAC for enflurane
- (C) Extrapyramidal signs
- (D) Increased gastric pH
- (E) Relief of intestinal obstruction
In a patient with sickle cell anemia, which of the following is LEAST likely to trigger sickling?
- (A) Hypothermia
- (B) Increased systemic vascular resistance
- (C) Low central venous pressure
- (D) Low mixed venous P02
- (E) Metabolic alkalosis
Physiologically, coronary blood flow relates most directly to
- (A) cardiac work
- (B) systolic blood pressure
- (C) myocardial oxygen consumption
- (D) heart rate
- (E) mean arterial pressure
Pulmonary artery occlusion pressure
- (A) does not reliably reflect left ventricular end-diastolic volume when left ventricular compliance is reduced
- (B) inaccurately reflects left atrial pressure when left atrial pressure exceeds 15 mmHg
- (C) is measured at end-inspiration in mechanically ventilated patients
- (D) overestimates left atrial pressure in patients with poor lung compliance
- (E) reflects left atrial pressure only if the catheter tip is located in zone II of the lung
Phase II neuromuscular block is characterized by
- (A) depressed twitch height, sustained tetanus, post-tetanic potentiation
- (B) depressed twitch height, tetanic fade, post-tetanic potentiation
- (C) depressed twitch height, tetanic fade, no post-tetanic potentiation
- (D) normal twitch height, tetanic fade, post-tetanic potentiation
- (E) normal twitch height, tetanic fade, no post-tetanic potentiation
A 73-year-old woman with a preoperative serum creatinine concentration of 2.1 mg/dl develops oliguria during enflurane anesthesia. Urine sodium concentration is 10 mEq/L and urine osmolality is 450 mOsm/L. The most likely cause of these findings is
- (A) acute renal failure
- (B) chronic renal insufficiency
- (C) decreased renal perfusion
- (D) fluoride nephrotoxicity
- (E) intraoperative administration of furosemide
Which of the following processes is primarily responsible for the decrease in core body temperature that occurs during the first hour of general anesthesia?
- (A) Decreased production of heat
- (B) Convective heat loss caused by cutaneous vasodilation
- (C) Evaporative heat loss during skin preparation
- (D) Heat loss from the respiratory tract
- (E) Redistribution of core body heat to the periphery
A 57-year-old man who weighs 150 kg and is 170 cm (67 in) tall is scheduled for cholecystectomy. He has a 100 pack-year smoking history. Which of the following findings on pulmonary function testing are most likely?
The patient whose flow-volume loop is shown on the right most likely has
- (A) bronchial asthma
- (B) a fixed midtracheal tumor
- (C) nasal polyps
- (D) restrictive lung disease
- (E) vocal cord paralysis