THE ALVEOLAR-ARTERIAL OXYGEN PRESSURE GRADIENT IN ANEMIA 1

The normal alveolar-arterial oxygen-tension gradient in man.

2. The gradient increased with age and with inspired O2 concentration up to 60%. Above 60%, during normal breathing, there was no significant change in gradient. 3. Breathing 100% 0, in deep breaths decreased the gradient in all age-groups, significantly so in subjects of 50 years and younger. The remaining gradient was due to anatomical venous shunt. 4. When this anatomical shunt was allowed f...

A matter of terminology. Alveolar-arterial oxygen gradient.

in accordance with the article of Fletcher et a13 who systematically tested the accuracy of this catheter system in humans. He also found a consistent underestimation of the fiberoptic pulmonary artery catheter SvO2 values below 50% compared with direct spectophotometry and proposed two equations to adjust the catheter measurements: (1) Catheter=-11.68+1.1892XCOOX (2) Catheter=COOX-210.997 exp ...

Alveolar-arterial oxygen gradient in the assessment of acute pulmonary embolism.

PURPOSE The purpose of this investigation is to evaluate the utility of the alveolar-arterial (A-a) oxygen gradient in the diagnosis of acute pulmonary embolism (PE) among patients who participated in the Prospective Investigation of Pulmonary Embolism Diagnosis (PIO-PED). METHODS Pulmonary embolism was diagnosed (n = 280) or excluded (n = 499) by angiography in all patients. Patients were th...

Alveolar and arterial oxygen tensions and the significance of the alveolar-arterial oxygen tension difference in normal men.

Effect of Fluid Balance on Alveolar-Arterial Oxygen Gradient in Mechanically Ventilated Patients

BACKGROUND Fluid balance affects outcome in critically ill patients. We studied the effect of fluid balance on oxygen exchange by assessing alveolar-arterial oxygen gradient (PA-a O2) in mechanically ventilated patients. Our primary objective was to evaluate the difference in PA-aO2 and the secondary goal was to evaluate the differences in age and mortality rate. MATERIALS AND METHODS This re...