RT Journal Article SR Electronic T1 Standardization of Sonographic Diaphragm Thickness Evaluations in Healthy Volunteers JF Respiratory Care FD American Association for Respiratory Care SP 920 OP 924 DO 10.4187/respcare.03999 VO 61 IS 7 A1 Carrillo-Esper, Raúl A1 Pérez-Calatayud, Ángel Augusto A1 Arch-Tirado, Emilio A1 Díaz-Carrillo, Manuel Alejandro A1 Garrido-Aguirre, Eduardo A1 Tapia-Velazco, Rafael A1 Peña-Pérez, Carlos Alberto A1 Espinoza-de los Monteros, Isis A1 Meza-Márquez, José Martín A1 Flores-Rivera, Oscar Iván A1 Zepeda-Mendoza, Adriana Denise A1 de la Torre-León, Teresa YR 2016 UL http://rc.rcjournal.com/content/61/7/920.abstract AB BACKGROUND: B-mode ultrasound can be used to measure diaphragm thickness at the zone of apposition. We believe it is necessary to develop normal values for diaphragm thickness at rest in a large group of healthy subjects and compare them with international results.METHODS: Ultrasound measurements of diaphragm thickness at expiratory rest were taken in 109 healthy individuals, with results stratified by sex, body mass index, and thorax circumference. The following methods were used for analysis and interpretation. Multivariable databases with descriptive statistical analyses were made. The Pearson chi-square test was used to evaluate the distribution between variables. Additionally, mean and SD values were calculated. For standardization, the data were separated by sex within a 95% CI, and we calculated a Z test. A 95% CI was also constructed for proportion analyses.RESULTS: One hundred nine healthy volunteers were included in the study, and the correlation between the body mass index and thorax circumference values with a Pearson chi-square test resulted in an r = 0.69. Additionally, the average value of diaphragmatic thickness was 0.19 ± 0.04 cm (95% CI 0.17–0.20 cm) for men and 0.14 ± 0.03 cm (95% CI 0.13–0.15 cm) for women (P = .001). There was no relation between body mass index thorax circumference, and diaphragmatic thickness.CONCLUSION: Real-time ultrasound of the diaphragm is a simple, inexpensive, and portable imaging technique that can provide qualitative anatomical information. The findings in this study show that sonographic diaphragm evaluations can be applied to the general population.