Respiratory Studies in Newborn Infants: I. Apparatus and Methods for Studies of Pulmonary Ventilation and the Mechanics of Breathing. Principles of Analysis in Mechanics of Breathing¹

Abstract

Summary Apparatus and methods for studying the pulmonary ventilation and the mechanics of breathing in newborn infants are described. For volunie recording with long duration a body plethysmograph system is used; for short recording periods, a reverse plethysmograph system. For studies of the mechanics of breathing the intraesophageal pressure changes have been cycles. recorded simultaneously with the volume changes occurring during single respiratory cycles. The reprodcibility and calibration of the methods are explained. The set has been used in respiratory studies in the neonatal period, which will be published at a later date in this journal. An outline of the principles of analysis of the mechanics of breathing and the different methods used for calculations