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Interobserver Reliability of Quantitative Muscle Sonographic Analysis in the Critically Ill Population
Author(s) -
Sarwal Aarti,
Parry Selina M.,
Berry Michael J.,
Hsu Fang-Chi,
Lewis Marc T.,
Justus Nicholas W.,
Morris Peter E.,
Denehy Linda,
Berney Sue,
Dhar Sanjay,
Cartwright Michael S.
Publication year - 2015
Publication title -
journal of ultrasound in medicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 91
eISSN - 1550-9613
pISSN - 0278-4297
DOI - 10.7863/ultra.34.7.1191
Subject(s) - medicine , critically ill , reliability (semiconductor) , critical illness , population , intensive care medicine , power (physics) , physics , environmental health , quantum mechanics
Objectives There is growing interest in the use of quantitative high‐resolution neuromuscular sonography to evaluate skeletal muscles in patients with critical illness. There is currently considerable methodological variability in the measurement technique of quantitative muscle analysis. The reliability of muscle parameters using different measurement techniques and assessor expertise levels has not been examined in patients with critical illness. The primary objective of this study was to determine the interobserver reliability of quantitative sonographic measurement analyses (thickness and echogenicity) between assessors of different expertise levels and using different techniques for selecting the region of interest. Methods We conducted a cross‐sectional observational study in neurocritical care and mixed surgical‐medical intensive care units from 2 tertiary referral hospitals. Results Twenty diaphragm and 20 quadriceps images were evaluated. Images were obtained by using standardized imaging acquisition techniques. Quantitative sonographic measurements included muscle thickness and echogenicity analysis (either by the trace or square technique). All images were analyzed twice independently by 4 assessors of differing expertise levels. Excellent interobserver reliability was obtained for all measurement techniques regardless of expertise level (intraclass correlation coefficient, >0.75 for all comparisons). There was less variability between assessors for echogenicity values when the square technique was used for the quadriceps muscle and the trace technique for the diaphragm. Conclusions Excellent interobserver reliability exists regardless of expertise level for quantitative analysis of muscle parameters on sonography in the critically ill population. On the basis of these findings, it is recommended that echogenicity analysis be performed using the square technique for the quadriceps and the trace technique for the diaphragm.