To evaluate the effect of arterial hypoxia on myocardial oxygen consumption (MVO2) under controlled conditions of stable or decreased contractility and tension, 18 anesthetized, adrenergically blocked dogs on right heart bypass were studied. Heart rate, cardiac output, pH, and Pco2 were constant. In 9 dogs, progressive decreases in arterial oxygen content were associated with progressive signif...

Background: This study aimed to determine the effects of various positions on the arterial oxygen saturation during enteral feeding of preterm infants admitted to Neonatal Intensive Care Units (NICUs). It is assumed that different body positions influence arterial oxygen saturation during enteral feeding.Methods: This crossover clinical trial included 88 infants. The inclusion criteria we...

The effects of halothane on myocardial blood flow and myocardial oxygen balance were studied in seven male patients with stable angina and normal left ventricular function. Patients were receiving maintenance doses of beta-receptor antagonists and underwent coronary artery bypass surgery. Anaesthesia consisted of halothane and 50% nitrous oxide in oxygen. Halothane decreased myocardial blood fl...

conclusions our case highlights the fact that the tip of the pulmonary artery catheter can easily advance into a peripheral branch of the pulmonary artery and cause pulmonary venous blood to be sampled instead of pulmonary arterial blood. a variety of monitoring techniques are needed to confirm accurate catheter placement. background pressure and waveform at the catheter tip are continuously mo...

results the sedative effects were equal in the two groups (p > 0.05), but the analgesic effects were higher in the pf group than in the pk group (p < 0.05). the pk group had higher blood pressure levels in the eighth minute. respiratory rate, heart rate, and arterial oxygen saturation showed no significant differences between the groups (p > 0.05). endoscopist satisfaction, patient satisfaction...

The cardiopulmonary effects of endotoxin administration (1 microgram/kg) were evaluated in 8-10 week old SPF-derived Yorkshire pigs, both because endotoxemia is a common and important swine problem, and because the pig is a good model for human adult respiratory distress syndrome. Physiological changes included sustained increases in mean pulmonary artery pressure, pulmonary vascular resistance...

Background: Arterial pressure is one of the most important physiological variables and often needs to be monitored repeatedly or continuously in perioperative period. Arterial pressure monitoring is one of the standard monitoring in operating room. During general anesthesia, blood pressure can be measured by using a noninvasive arterial pressure method or continuous invasive arterial pressure b...

Hemodynamics and myocardial metabolism were evaluated in 18 patients in cardiogenic shock following acute myocardial infarction. The response to l-norepinephrine was studied in seven cases and the response to isoproterenol in four cases. Cardiac index (CI) was markedly reduced, averaging 1.35 liters/min per m(2). Mean arterial pressure ranged from 40 to 65 mm Hg while systemic vascular resistan...

OBJECTIVE To examine venous partial pressure of oxygen (PvO(2)), transcutaneous oxygen tension (tcPO(2)), and VO(2)MAX in a normobaric environment after a single hyperbaric oxygen (HBO(2)) treatment. METHODS This was a prospective study of conditions after the intervention compared with baseline. The participants were 10 moderately trained (VO(2)MAX = 57.6 ml/kg/min) men. Two HBO(2) treatment...

Parental care is a widespread and ecologically relevant adaptation known to enhance the developmental environment of offspring. Parental behaviors, however, may entail both costs and benefits for developing offspring. In Children's pythons (Antaresia childreni), we monitored both maternal egg-brooding behavior and intra-clutch oxygen partial pressure (PO2) in real-time to assess the effects of ...