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Inter- and intra-observer variability of ultrasonographic arm muscle thickness measurement by critical care physicians


1 Department of Pulmonary Medicine and Sleep Disorders, All India Institute of Medical Sciences, New Delhi, India
2 Department of Biostatistics, All India Institute of Medical Sciences, New Delhi, India

Correspondence Address:
V Hadda,
Department of Pulmonary Medicine and Sleep Disorders, All India Institute of Medical Sciences, New Delhi
India
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Source of Support: None, Conflict of Interest: None

Purpose: The aim of this study was to assess inter- and intra-observer variability of arm muscle thickness measured by critical care physicians using bedside ultrasonography (USG). Methodology: This prospective study included twenty patients admitted with sepsis. Three measurements of thickness of right arm muscles of each patient using B-mode USG were taken by two critical care fellows, independently. Intra- and inter-observer reliability was tested using intraclass correlation coefficient (ICC). Results: The mean 1st, 2nd, and 3rd measurements of muscle thickness recorded by observer 1 and 2 were 23.620 (±4.171) versus 23.840 (±3.849) mm, 23.235 (±3.620) versus 23.625 (±4.062) mm, and 24.125 (±4.098) versus 23.965 (±3.651) mm, respectively. The average muscle thickness measured by first and second observer was 23.660 (±3.834) mm and 23.810 (±3.674) mm, respectively. ICC for intra-observer variability for observer 1 and 2 was 0.964 (95% confidence interval [CI] 0.924–0.985) and 0.949 (95% CI 0.892–0.978), respectively. ICC for inter-observer variability was 0.995 (95% CI 0.988–0.998). Conclusions: USG is a reliable tool for assessment of arm muscle thickness by critical care physicians.


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    -  Hadda V
    -  Kumar R
    -  Dhungana A
    -  Khan M A
    -  Madan K
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Online since 12th February '04
2004 - Journal of Postgraduate Medicine
Official Publication of the Staff Society of the Seth GS Medical College and KEM Hospital, Mumbai, India
Published by Wolters Kluwer - Medknow