AIM To determine if oxygen saturation in retinal vessels depends on the degree of diabetic retinopathy. MATERIAL AND METHODS A prospective study comparing values of oxygen saturation in retinal arteries, veins, and arterio - venous (A-V) difference in healthy persons and in patients with diagnosed diabetes. The study included 114 eyes of 76 patients with diagnosed diabetes, and 57 eyes of 57 ...

Continuous monitoring of mixed venous oxygen saturation (SvO2) and arterial oxygen saturation (SaO2) was used to guide cardiovascular and pulmonary physiologic manipulations in three patients. An index, termed the "shunt index" (SI), of venoarterial admixture (Qva/Qt) was calculated at the bedside. SI correlated significantly in each patient with Qva/Qt (p less than .01). In one of the patients...

We have studied the effect of sedation with midazolam on arterial oxygen saturation during spinal anaesthesia in two groups of patients: one group received supplementary oxygen, the other group breathed room air. A significant reduction in oxygen saturation was observed in patients not receiving supplementary oxygen; six of 15 patients in this group developed hypoxaemia or severe hypoxaemia whi...

We describe, in Ethiopia, a third successful pattern of human adaptation to high-altitude hypoxia that contrasts with both the Andean "classic" (erythrocytosis with arterial hypoxemia) and the more recently identified Tibetan (normal venous hemoglobin concentration with arterial hypoxemia) patterns. A field survey of 236 Ethiopian native residents at 3,530 m (11,650 feet), 14-86 years of age, w...

Pulse oximetry is a technique of fetal monitoring during labour based on non-invasive measurement of fetal arterial oxygen saturation. It has been shown in animal studies that metabolic acidosis occurred for a fetal arterial oxygen saturation below 30%. One of the main debates during initial experience in humans, was focused on the adequate cut-off for intervention (or non-intervention), and th...

AIM To study continuously cerebral blood flow velocity in the middle cerebral artery before, during, and after tube feeding in neonates. METHOD Cerebral blood flow velocity was measured in 14 neonates using a Doppler ultrasound device. Blood pressure, respiration, and oxygen saturation were monitored. RESULTS Mean blood flow velocity decreased from 37 cm/s before feeding to 33 cm/s (P < 0.0...

The aim of the study was to investigate hypoxaemia in chronic obstructive pulmonary disease patients during a commercial flight. The effect of a commercial flight, lasting 5 h 40 min, on arterial blood gas levels and symptoms in 18 chronic obstructive pulmonary disease patients with a pre-flight percutaneous oxygen saturation of 94% and self-reported ability to walk 50 m without severe dyspnoea...

Arterial oxygen transport (cardiac output x arterial oxygen content) may be decreased in heart failure. We studied the determinants of arterial oxygen transport in 15 patients with chronic, severe myocardial failure at rest and during cycle ergometry. During control therapy at rest, arterial oxygen tension was normal (81 +/- 8 mm Hg, mean +/- SD) and increased slightly during exercise (90 +/- 1...