Air distribution in lungs during hyperventilation
نویسندگان
چکیده
منابع مشابه
Cleaner air, bigger lungs.
In the latter half of the 20th century, Los Angeles had, by many measures, higher levels of photochemical air pollutants than any other major city in the United States (Fig. 1). To address this problem, the California Air Resources Board and its partners became leaders in quantifying the health effects of air pollutants and in aggressively implementing pollution-control strategies. Even with th...
متن کاملMucociliary clearance during and after isocapnic hyperventilation with dry air in the presence of frusemide.
We have previously shown that mucociliary clearance (MCC) decreased during and increased after isocapnic hyperventilation (ISH) with dry air, both in asthmatic and healthy subjects. Inhaled frusemide, an inhibitor of the Na+/K+/2Cl- and NaCl co-transporters on the basolateral membrane of the epithelial cell, prevents the airway narrowing provoked by ISH with dry air. The co-transport system con...
متن کاملElectroencephalographic activity during voluntarily controlled alveolar hyperventilation.
The following results were obtained from a series of investigations in which alveolar hyperventilation was controlled within narrow limits. (1) Delta rhythm was not directly related to alveolar ventilation, alveolar carbon dioxide tension or excretion of carbon dioxide. The appearance of d:lta rhythm was not necessarily associated with loss of consciousness. (2) Frontal alpha rhythm was apparen...
متن کاملStudies on hyperventilation; electrocardiographic changes in normal man during voluntary hyperventilation.
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...
متن کاملHyperventilation-induced hypotension during cardiopulmonary resuscitation.
BACKGROUND A clinical observational study revealed that rescuers consistently hyperventilated patients during out-of-hospital cardiopulmonary resuscitation (CPR). The objective of this study was to quantify the degree of excessive ventilation in humans and determine if comparable excessive ventilation rates during CPR in animals significantly decrease coronary perfusion pressure and survival. ...
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ژورنال
عنوان ژورنال: The Journal of Physiology
سال: 1949
ISSN: 0022-3751
DOI: 10.1113/jphysiol.1949.sp004371