![]() Not all the air we breathe in is able to be used for the exchange of oxygen and carbon dioxide. In adults, it is usually in the range of 150 mL. In physiology, dead space is air that is inhaled by the body in breathing, but does not partake in gas exchange. Risk calculators and risk factors for Dead spaceÄ®ditor-In-Chief: C. US National Guidelines Clearinghouse on Dead spaceÄirections to Hospitals Treating Dead space ![]() Ongoing Trials on Dead space at Clinical ![]() Anatomic dead space is age dependent and is > 3 ml/kg in early infancy.Articles on Dead space in N Eng J Med, Lancet, BMJ The following relationship between total anatomic dead space (DStotal in ml/kg) and age (in yr) is derived: DStotal = 3.28 - 0.56, with r = 0.95 and P = 0.0001. Mean intrathoracic anatomic dead space was 1.03 ml/kg and was not related to age. Extrathoracic dead space per kilogram decreased exponentially with increasing age, ranging from 2.3 ml/kg in early infancy to 0.8 ml/kg in children older than 6 yr. Intrathoracic dead space was measured by continuous analysis of end-tidal and mixed-expired PCO2 and minute ventilation in 10 patients, aged 18 days to 14.7 yr. Extrathoracic dead space was measured by a "water displacement" technique in 40 patients aged 7 days to 14.2 yr who were intubated with cuffed endotracheal tubes. Because of the relatively large head size of infants and children, we hypothesized that extrathoracic and, therefore, total dead space would be relatively larger in pediatric subjects. In adults, anatomic dead space is 2.2 ml/kg.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |