Postmortem demonstration of intrapulmonary arteriovenous shunting.
نویسندگان
چکیده
منابع مشابه
Postmortem demonstration of intrapulmonary arteriovenous shunting.
The measurement of the pressure required to drive a 2% solution of gelatin across the pulmonary vascular bed of a group of 49 infants dying suddenly at less than 44 weeks' postnatal age, has shown the presence of low pressure arteriovenous shunting in 30 cases (61%). Injection of polymethylmethacrylate beads in three cases has demonstrated that the vessels that form the shunts are up to 60 micr...
متن کاملHypoxia-induced intrapulmonary arteriovenous shunting at rest in healthy humans.
Intrapulmonary arteriovenous (IPAV) shunting has been shown to occur at rest in some subjects breathing a hypoxic gas mixture [fraction of inspired oxygen (FI(O(2))) = 0.12] for brief periods of time. In the present study we set out to determine if IPAV shunting could be induced at rest in all subjects exposed to hypoxia for 30 min. Twelve subjects (6 women) breathed four levels of hypoxia (FI(...
متن کاملExercise-induced intrapulmonary arteriovenous shunting in healthy humans.
We hypothesized that increasing exercise intensity recruits dormant arteriovenous intrapulmonary shunts, which may contribute to the widened alveolar-arterial oxygen difference seen with exercise. Twenty-three healthy volunteers (13 men and 10 women, aged 23-48 yr) with normal lung function and a wide range of fitness (mean maximal oxygen uptake = 126% predicted; range = 78-200% predicted) were...
متن کاملChanges in Intrapulmonary Shunting
We would like to offer the following comments concerning the interesting paper by Shapiro et al (Chest 1980; 77:138). Even though we agree, in general terms, with their statement that venous admixture ( va/Qt) should increase when a patient breathes 100 percent 02, measured either by Berggien’s classic methodl or with the inert gases technique,2 we have observed that it does not always do so be...
متن کاملCounterpoint: Exercise-induced intrapulmonary shunting is real.
intrapulmonary shunt is miniscule is further confirmed by a recent study reporting venous admixture in very fit athletes during exercise breathing pure O 2 (18). During 100% oxygen breathing, alveolar PO 2 is elevated to such an extent that ventilation-perfusion inequality and diffusion limitation no longer contribute to the AaDO 2 —it can be explained only by right to left shunting (18). In th...
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ژورنال
عنوان ژورنال: Archives of Disease in Childhood
سال: 1990
ISSN: 0003-9888,1468-2044
DOI: 10.1136/adc.65.4.435