When evaluating a screening test, which of the following is the most appropriate term for the proportion of patients with a disease who have a positive test result?
A 36-year-old woman who undergoes peritoneal dialysis for chronic renal failure requires emergency surgical exploration for bowel obstruction. Serum creatinine concentration is 9.8 mg/dl and BUN concentration is 124 mg/dl. The most likely abnormality of coagulation is
(A) decreased euglobulin lysis time
(B) decreased platelet count
(C) prolonged activated partial thromboplastin time
Compared with a patient who is breathing spontaneously, a patient in the supine position receiving controlled positive-pressure ventilation will most likely have which of the following findings?
A Fluotec vaporizer is set to administer halothane 4% using a fresh gas flow of 4 L/min. If the diluent gas flow is increased to 8 L/min, and at the same time the room temperature increases from 20 to 25°C, the approximate concentration of halothane delivered to the patient would be
Which of the following is the most appropriate initial therapy for acute pulmonary hypertension with right ventricular dysfunction and severe systemic hypotension that occurs during anesthesia?