Results 141 to 150 of about 7,708 (187)

Hyperventilation-Induced Hypocapnia in an Aviator

Aerospace Medicine and Human Performance, 2022
BACKGROUND: Physiological episodes are a top safety concern for aviators across the United States military. While many cases and a variety of causes for physiological episodes have been described, few cases, if any, have been reported of hyperventilation-induced hypocapnia and transient loss of consciousness.
Kathleen E P, Kramer, Eric E, Anderson
exaly   +3 more sources

Dependence of csf on plasma bicarbonate during hypocapnia and hypoxemic hypocapnia

Respiration Physiology, 1976
We have previoulsy shown pH compensation to be similar in CSF and arterial blood during chronic hypoxemic hypocapnia in man and pony, and postulated that the compensatory reduction in CSF [HCO3] was dependent upon corresponding changes in [HCO3]a. We tested this hypothesis in anesthetized, paralyzed dogs by determining the effects of 7 or 14 hours of ...
Jérôme Dempsey, J A Dempsey, Dale A Pelligrino   +2 more
exaly   +3 more sources

Tachypnea and hypocapnia are induced by ‘buffeting’ in vehicles

Clinical Autonomic Research, 2006
Normal physiological responses to vehicular buffeting were studied during a 5 minute mild 'off road' exposure in a motion simulator. The ride provoked an initial increase in heart rate and blood pressure and a significant hypocapnia of P(ET) CO(2) 34 mm Hg caused by tachypnea, which took 5 minutes to recover. Motion induced hypocapnia could be a source
Green, David, Bray, Adam, Golding, John, Foster, Bronstein, Adolfo, Miguel, Gresty, Michael, Andrew   +4 more
openaire   +4 more sources

Circulatory responses to hypocapnia in the anesthetized dog

American Journal of Physiology-Legacy Content, 1965
The circulatory responses to hypocapnia were studied in 40 anesthetized dogs. Hypocapnia induced without a change in ventilation caused slight increase in limb vascular resistance in six dogs and decrease in one. Hypocapnia induced by hyperventilation caused increase in limb vascular resistance in six dogs and decrease in four.
H A, KONTOS, H P, MAUCK, D W, RICHARDSON, J L, PATTERSON   +3 more
openaire   +3 more sources

Association Between Hypocapnia and Febrile Seizures

Journal of Child Neurology, 2014
The purpose of this study is to determine whether hyperthermia-induced hyperventilation with subsequent hypocapnia is relevant to febrile seizures in children. This is only the second study to measure pCO2 and pH values in children with febrile seizures. This prospective case-control study enrolled 18 children who presented with febrile seizures and 18
Ilknur Erol, Yasemin Ozkale, Semra Saygi   +2 more
exaly   +3 more sources

Mechanisms of Hypoxemia and Hypocapnia in Pulmonary Embolism

American journal of respiratory and critical care medicine, 1995
Abstract Mechanisms of hypoxemia and hypocapnia in pulmonary embolism (PE) are incompletely understood. We studied 10 patients at diagnosis (D) and five of these again after 10 to 14 d of heparin treatment (T). Patients had right heart catheterization, assessment of ventilation-perfusion ratio (VA/Q) distribution by inert gas ...
Santolicandro AM, Prediletto R, Fornai E, Formichi B, Begliomini E, Giannella NA, Giuntini C   +6 more
openaire   +4 more sources

Brain cell swelling during hypocapnia increases with hyperglycemia or ketosis [PDF]

Pediatric Diabetes, 2014
BackgroundSevere hypocapnia reduces cerebral blood flow (CBF) and is known to be a risk factor for diabetic ketoacidosis (DKA)-related cerebral edema and cerebral injury in children.
Daniel Tancredi, Nicole Glaser
exaly   +2 more sources

Hypercapnia and hypocapnia in neonates

World Journal of Pediatrics, 2008
The arterial partial pressure of carbon dioxide (PaCO2) represents the balance between CO2 production and consumption. Abnormal increase or decrease in PaCO2 can affect the body's internal environment and function. Permissive hypercapnia has aroused more attention as a novel ventilatory therapy.
Wei, Zhou, Wen, Liu
openaire   +2 more sources

Hypocapnia, mitochondria and surfactant secretion

Thorax, 2019
Surfactant, a phospholipoprotein produced and stored by alveolar type II (ATII) cells, lowers surface tension in the alveolus and distal airways and is essential for normal lung mechanics and gas exchange.1 Decreases in surfactant production induced by prematurity or disease cause alveolar collapse, hypoxemia and reductions in lung compliance, thereby ...
Beata, Kosmider, Karim, Bahmed, Steven, Kelsen   +2 more
openaire   +2 more sources

Lactate and pyruvate accumulation during hypocapnia

Respiration Physiology, 1971
Abstract Dogs anesthetized with sodium pentobarbital and passively hyperventilated to Pa CO 2 of 15 torr developed an increase in blood lactate plus pyruvate of approximately 2 mM/L m 2 hr. When the same procedure was carried out with animals breathing 5% CO 2 there was no increase in lactate or pyruvate.
A C, Garcia, Y I, Lai, B A, Attebery, E B, Brown   +3 more
openaire   +2 more sources