Minimal air in dogs

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Abstract
The “minimal air” of supine dogs was measured by subtracting from the functional residual capacity the volume expelled from the lungs when the sternum was widely split. Minimal air/functional residual capacity, minimal air/lung weight, and minimal air/animal weight were 57.0 ± 8.6%, 9.51 ± 2.92 ml/g, 21.8 ± 4.2 ml/kg, respectively. The correlation coefficient of minimal air with functional residual capacity was .79 (P < 1%), of minimal air with animal weight was 0.70 (P < 1%), and of minimal air with lung weight was .67 (P < 5%). The ratio minimal air/functional residual capacity of these dogs compared with the ratio residual volume/functional residual capacity of supine men. The airway component of the minimal air was approximately 36% and the alveolar component approximately 64%. The lungs contained the minimal air at a time when airways were patent rather than collapsed. functional residual capacity; residual volume Submitted on March 11, 1963

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