CALDER, W+ A., AND KNUT SCHMIDT-NELSEN. Punting and blood carbon dioxide in birds. Am. J* Physiol, 215(2): 4771482. 1968.-The respiration of resting and panting birds was studied in nine species representing a wide range of size, morphology, and habits. All these birds had similar values for arterial blood PCU~ and pH during normal resting respiration (28 mm C02, pH = 7.5). These values are muc...

The effect of hypercapnia on coronary vascular resistance (CVR) was studied in seven open-chest dogs. Coronary blood flow was supplied to the cannulated left main coronary artery from the femoral artery by a precision pump. Coronary arterial PCO2 was locally controlled with a small membrane oxygenator in the coronary perfusion circuit. Each PCO2 change was made at a constant coronary flow, and ...

CONTEXT Patients with chronic fatigue syndrome and those with orthostatic intolerance share many symptoms, yet questions exist as to whether CFS patients have physiological evidence of orthostatic intolerance. OBJECTIVE To determine if some CFS patients have increased rates of orthostatic hypotension, hypertension, tachycardia, or hypocapnia relative to age-matched controls. DESIGN Assess b...