RICHAKDSON, DAVID Mr., HERMES A. KONTOS, A. JARRELL RAPER, AND JOHN L. PATTERSON, JR. Systemic circulatory responses to hypocapnia in man. Am. J. Physiol. !223(6): 1308-1312. 1972.Hypocapnic alkalosis, induced by voluntary hyperventilation in normal man, was associated with increases in cardiac output and in heart rate and decreases in mean arterial blood pressure and in systemic vascular resis...

A patient with exercise-induced asthma is described in whom the post-exercise fall in F.E.V.1 was not prevented by the inhalation of isoprenaline immediately before exercise but was almost completely prevented by subcutaneous atropine given 40 minutes before exercise. A large fall in F.E.V.1 similar to the fall after exercise occurred after carbon dioxide-induced hyperventilation and voluntary ...

Angiographic studies have demonstrated improved visibility of glial tumors after hyperventilation. The present study was undertaken to determine whether hyperventilation would change the MR enhancement characteristics of various glial tumors. Eighteen patients were studied twice: once with standard contrast-enhanced MR imaging and again with standard imaging plus hyperventilation. After hyperve...

Any normal human being will present certain cardiac symptoms, besides the well-known tetany signs, during voluntary hyperventilation, which removes carbon dioxide. Thus a feeling of precordial oppression, in some cases increasing to proper precordial pains with eradiation to the left arm, and often accompanied by an unaccountable sensation of fear, will generally develop after 1 or 2 minutes of...

Patients with FHF have a high risk of cerebral edema and intracranial hypertension. The pathophysiological background for this phenomenon is not completely settled, but alteration in CBF as well as cerebral metabolism seems to be of importance. Mechanical hyperventilation has a prompt effect on intracranial pressure. This effect is assumed to be caused by the hypocapnia induced alkalosis which ...