[abstract] CLASSIFICATION OF DECOMPRESSION ILLNESS (DCI) BY CLUSTER ANALYSIS

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[abstract] CLASSIFICATION OF DECOMPRESSION ILLNESS (DCI) BY CLUSTER ANALYSIS

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Title: [abstract] CLASSIFICATION OF DECOMPRESSION ILLNESS (DCI) BY CLUSTER ANALYSIS
Author: Ozyigit, T; Egi, S; Denoble, P; Balestra, C; Aydin, S; Vann, R; Marroni, A
Abstract: BACKGROUND: Our previous work using principal component analysis found poor correlation of traditional DCI classifications (AGE, DCSI, and DCSII) with the expected manifestations (Dear. UHM 1997; 24 (Suppl.): A144). The present work tested the hypothesis that DCI manifestations occur in natural groups independent of a prior classifications. MATERIALS AND METHODS: Data were 1929 DCI cases (1368 male, 561 female, average age 38) with 25 manifestations reported to the Divers Alert Network (DAN) from 1998-2002. The optimum number of clusters was determined using a "two-step" cluster analysis with Bayesian Information Criterion (Aldenderfer & Blashfield. Cluster analysis. Beverly Hills: Sage Publications; 1984). A manifestation characteristic of a cluster was defined if it occurred in more than 50% of cases in a cluster. Characteristic manifestations were removed from succeeding clusters, so clusters were hierarchical as in DCSII and DCSI. RESULTS: Four clusters were identified. Cluster 1: pain-only (300 cases). Cluster 2: numbness, paresthesia, skin sensitivity (741 cases). Cluster 3: weakness, paralysis, muscular weakness, and bladder-bowel dysfunction (333 cases). Cluster 4: hearing, lymphatic, tinnitus, skin, mental, pulmonary, muscular, vision problems, unconsciousness, headache, vertigo, nausea, fatigue, dizziness, and abnormal sensations (555 cases). CONCLUSIONS: Manifestations characteristic of Cluster 1 may correspond to limb and/or joint pain. Cluster 2 appears to represent mild non-specific cases. Bladder/bowel manifestations were nearly exclusive to Cluster 3 suggesting spinal cord injury. Cerebral and sensory organ manifestations were concentrated in Cluster 4 also suggesting serious injury. The relationship of clusters to therapeutic outcome might be tested by methods such as survival analysis (Vann, this meeting).
Description: Abstract of the Undersea and Hyperbaric Medical Society, Inc. Annual Scientific Meeting, Las Vegas, Nevada, USA. (http://www.uhms.org)
URI: http://archive.rubicon-foundation.org/9088
Date: 2009

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  • UHMS Meeting Abstracts
    This is a collection of the published abstracts from the Undersea and Hyperbaric Medical Society (UHMS) annual meetings.

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