title: Increase in PaO2 following intravenous administration of propranolol in acutely hypoxemic patients.
abstract: To define the effects of beta-blockade therapy on PaO2, arterial blood gas levels were determined before and after therapeutic administration of propranolol in 44 acutely ill patients. With a FIo2 of 0.33 +/- 0.08, the PaO2 increased from 89.6 +/- 3.6 to 95.3 +/- 3.8 mmHg (p less than 0.01), 10 minutes after intravenous administration of 1 to 3 mg of propranolol. Simultaneous hemodynamic measurements obtained in six patients demonstrated a dramatic decrease in venous admixture, associated with decreases in cardiac output and mixed venous Po2. Propranolol administration generally results in a moderate increase in PaO2, which is related to a significant decrease in pulmonary shunt. The clinical implications of these findings are limited by the expected decrease in tissue oxygen delivery after beta-blockade therapy.
mesh_terms: D001794:Blood Pressure / Q000187:drug effects; D005260:Female; D006339:Heart Rate / Q000187:drug effects; D006439:Hemodynamics / Q000187:drug effects*; D006801:Humans; D000860:Hypoxia / Q000097:blood / Q000503:physiopathology*; D008297:Male; D010100:Oxygen / Q000097:blood*; D010313:Partial Pressure; D011433:Propranolol / Q000494:pharmacology* / Q000627:therapeutic use; D011652:Pulmonary Circulation / Q000187:drug effects; D012121:Respiration, Artificial
chemical_list: D011433:Propranolol; D010100:Oxygen