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VOLUME PRESSURE RELATIONS OF THE LUNGS OF CHILDREN MEASURED DURING THORACOTOMY

Pulmonary compliance was estimated by direct measurement of the airway pressure in children under 7 years of age during intrathoracic surgery. In patients over 12 months of age the compliance, measured at the beginning of operation, increased with age, weight, height and surface area. In patients under the age of 12 months pulmonary compliance was markedly lower in those with very large pulmonary to systemic flow ratios when compared with the other patients. In 5 of 14 patients who underwent banding of the pulmonary artery there was a marked increase in compliance measured just after the operation.