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Transdiaphragmatic pressure in young adult Singaporean subjects ‐ normal values and a comparison between different respiratory manoeuvres
Author(s) -
Chan CHOONGCHEE,
Cheong TUCKHONG,
Wang YEETANG,
Poh SOOCHUAN
Publication year - 1996
Publication title -
australian and new zealand journal of medicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.596
H-Index - 70
eISSN - 1445-5994
pISSN - 0004-8291
DOI - 10.1111/j.1445-5994.1996.tb02910.x
Subject(s) - medicine , residual volume , diaphragm (acoustics) , functional residual capacity , lung volumes , respiratory system , cardiology , lung , physics , acoustics , loudspeaker
Background: Most published normal values for transdiaphragmatic pressure (Pdi) have been from Caucasian subjects and there is no universal agreement regarding the most appropriate manoeuvre for assessing Pdi. Aims: The aims of our study were to obtain normal values and to compare the different manoeuvres used to assess Pdi in normal young Singaporean adults. Methods: Twenty‐four normal subjects (23 Chinese, one Indian) were studied by measuring Pdi during maximal sniffs from functional residual capacity (sniff Pdi), maximal inspiration to total lung capacity (Pdi TLC) and maximal static inspiratory efforts from residual volume (Pdi PImax). Results: Mean values±SD for sniff Pdi, Pdi TLC and Pdi PImax were 101.8±31.7, 46.8±26.4 and 83.5±35.5 cm H 2 0 respectively. Sniff Pdi was significantly higher than Pdi TLC ( p <0.001) and Pdi PImax ( p =0.005). Pdi PImax was significantly higher than Pdi TLC ( p <0.001). Males had significantly higher values for sniff Pdi ( p =0.026) and Pdi PImax ( p =0.022) than females. There was a significant correlation between the different methods of recording Pdi. Sniff Pdi had the highest values, least between‐ and within‐subject variation and most consistent pattern of respiratory muscle recruitment with the lowest proportion of negative gastric pressure (Pg) values ( p <0.001). Conclusions: Therefore, sniff Pdi may be better than Pdi TLC and Pdi PImax in assessing diaphragm function. Also, our subjects seemed to have lower sniff Pdi and Pdi PImax, and higher Pdi TLC compared with Caucasian subjects.