COFFMAN, JAY D., AND PETER ALLY. Hyperventilation and human calf blood $0~. Am. J. Physiol. 21 I (5): 1255-1260. rg66.-Calf blood flow was measured in normal subjects by venous occlusion plethysmography, and capillary blood flow by the disappearance rate of an intramuscular injection of NaI131 before and during hyperventilation at 30 breaths/min for 3 min. Hyperventilation with room air produce...

BACKGROUND High levels of exhaled carbon monoxide (eCO) are a marker of airway or lung inflammation. We investigated whether hypo- or hyperventilation can affect measured values. METHODS Ten healthy volunteers were trained to achieve sustained end-tidal CO2 (etCO(2)) concentrations of 30 (hyperventilation), 40 (normoventilation), and 50 mmHg (hypoventilation). As soon as target etCO(2) values...

The concept of hyperventilation and the principle of a vicious circle provide an elegant explanation for the development of a wide range of somatic and psychological symptoms, the so-called hyperventilation syndrome (HVS). The model has a high degree of credibility and has led to the development of therapeutic interventions that appeared beneficial. However, recent investigations dismiss hyperv...

Central neurogenic hyperventilation (CNH) is a rare condition and defined as a syndrome comprising normal or elevated arterial oxygen tension, decreased arterial carbon dioxide tension, respiratory alkalosis with hyperventilation even during sleep, and the absence of a peripheral respiratory stimulus. The diagnosis of CNH requires the exclusion of pulmonary, cardiac, metabolicimmunological diso...

We report about a 49 year old woman with repeated chest pain at rest. During hyperventilation significant ST-segment elevation in leads V1-V5 appeared. Bicycle stress test did not provoke any ECG changes. Coronary angiography showed a significant stenosis of the left anterior descending coronary artery. Successful balloon angioplasty followed by stent implantation was performed. After an uneven...

BACKGROUND Hyperventilation has been an integral, but poorly validated part of neuroanesthetic practice. We conducted a two-period, crossover, randomized trial to evaluate surgeon-assessed brain bulk and measured intracranial pressure (ICP) in patients undergoing craniotomy for removal of supratentorial brain tumors during moderate hypocapnia or normocapnia. METHODS Two-hundred and seventy-fi...

The study intended to make a critical review on use of pulmonary hyperventilation maneuvers and the different positive end-expiratory pressures applied to traumatic brain injury patients. As a reference were used publications in English, Spanish and Portuguese, contained in the following databases: MedLine, SciELO and LILACS, from 2000 to 2007, we included all studies about the use of pulmonary...

Some data suggest that panic patients with extensive agoraphobia (PDA) display more intense respiratory distress during their panic attacks than Panic disorder (PD) patients. However, no studies have determined if PDA patients also show heightened sensitivity to a respiratory challenge compared to PD patients. The current study examined the differential emotional responding to hyperventilation ...

To examine further the relation between type of exercise, workload, ventilation, and exercise-induced asthma, we compared treadmill walking with treadmill running and treadmill running with isocapnic hyperventilation in separate studies in children and adolescents. Inspired air conditions were identical during each pair of tests. Walking and running with similar minute ventilation and oxygen co...