Airway blood flow responses to temperature and humidity of inhaled air
| Autor: | Charles Le Merre, Helen H. Kim, Alejandro D. Chediak, Adam Wanner |
|---|---|
| Rok vydání: | 1996 |
| Předmět: |
Adult
Male Pulmonary and Respiratory Medicine Physiology Respiratory System Inhaled air Airway resistance medicine Humans Relative humidity Respiratory system Mucous Membrane Chemistry Air Airway Resistance Temperature Humidity Blood flow Middle Aged Anesthesia Respiratory Physiological Phenomena Breathing Room air distribution Female medicine.symptom Blood Flow Velocity Vasoconstriction |
| Zdroj: | Respiration Physiology. 105:235-239 |
| ISSN: | 0034-5687 |
| DOI: | 10.1016/0034-5687(96)00053-9 |
| Popis: | We determined the effect of breathing cold dry air (-39 degrees C, 0.1% relative humidity, RH) and warm humid air (43 degrees C, 100% RH) on airway mucosal blood flow (Qaw) in normal human subjects (n = 8, age 25-53 years) at rest. Qaw was measured with a dimethylether uptake technique which reflects blood flow in the mucosa of large airways corresponding to a 50 ml anatomical dead-space segment extending distally from the trachea. Mean Qaw was 10.1 +/- 1.9 ml min-1 (mean +/- S.D.) during room air breathing (25 degrees C, 70% RH) and decreased to 4.7 +/- 2.1 ml min-1 during cold dry air breathing (p < 0.05). Within 20 min of resuming room air breathing, mean Qaw had returned to baseline. Breathing warm humid air had no significant effect on mean Qaw (8.2 +/- 1.4 ml min-1). These results indicate that quiet breathing of frigid air causes vasoconstriction in central airways. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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