Samantha Holtzhausen1, Marianne Unger1, Alison Lupton-Smith2, Susan Hanekom1. 1. Division of Physiotherapy, Stellenbosch University, PO Box 241, Cape Town, 8000, South Africa. 2. Division of Physiotherapy, Stellenbosch University, PO Box 241, Cape Town, 8000, South Africa. Electronic address: aluptonsmith@sun.ac.za.
Abstract
PURPOSE: Sonographic assessment of the diaphragm may be a surrogate for interpretation of diaphragm function in mechanically ventilated patients. This study aimed to determine the correlation between respiratory muscle function and diaphragm thickness in a healthy population. METHODS: A descriptive study was conducted. Diaphragm thickness was determined by sonographic measurement. Respiratory muscle strength, fatigue and endurance was determined using a mouth pressure manometer. RESULTS: 55 subjects with a mean (SD) age 21.16 ± 1.55 years were studied. Diaphragm thickness was moderately correlated with strength (r = 0.52; r2=0.27; p < 0.001). Respiratory muscle fatigue was not correlated with thickness (r=-0.15; r2=0.02; p = 0.29) or strength (r=-0.19; r2=0.04; p = 0.16). CONCLUSION: Diaphragm thickness was moderately correlated to strength but not to fatigue or endurance in healthy individuals. Sonography may be a surrogate measure of volitional respiratory muscle strength and requires confirmation in critically ill patients.
PURPOSE: Sonographic assessment of the diaphragm may be a surrogate for interpretation of diaphragm function in mechanically ventilated patients. This study aimed to determine the correlation between respiratory muscle function and diaphragm thickness in a healthy population. METHODS: A descriptive study was conducted. Diaphragm thickness was determined by sonographic measurement. Respiratory muscle strength, fatigue and endurance was determined using a mouth pressure manometer. RESULTS: 55 subjects with a mean (SD) age 21.16 ± 1.55 years were studied. Diaphragm thickness was moderately correlated with strength (r = 0.52; r2=0.27; p < 0.001). Respiratory muscle fatigue was not correlated with thickness (r=-0.15; r2=0.02; p = 0.29) or strength (r=-0.19; r2=0.04; p = 0.16). CONCLUSION: Diaphragm thickness was moderately correlated to strength but not to fatigue or endurance in healthy individuals. Sonography may be a surrogate measure of volitional respiratory muscle strength and requires confirmation in critically illpatients.
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