[abstract] REPORTED AND ESTIMATED DECOMPRESSION SICKNESS IN RECREATIONAL DIVING.

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[abstract] REPORTED AND ESTIMATED DECOMPRESSION SICKNESS IN RECREATIONAL DIVING.

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Title: [abstract] REPORTED AND ESTIMATED DECOMPRESSION SICKNESS IN RECREATIONAL DIVING.
Author: Denoble, PJ; Vann, RD; Gerth, WA
Abstract: INTRODUCTION: We compared the apparent occurrence of decompression sickness (DCS) in data from DAN's Project Dive Exploration (PDE) to the DCS risk estimated by a probabilistic decompression model based on depth-time profiles recorded by dive computers. METHODS: Recreational divers gave informed consent and volunteered data about themselves, their dives, and their post-dive symptoms. They were encouraged to report all symptoms even if clearly unrelated to diving. Their depth-time profiles were recorded by Cochran, Suunto, or Uwatec dive computers. A DCS risk was estimated for each dive using a probabilistic model calibrated to 3,322 well-documented military dive trials (Gerth, Vann. UHM 24: 275, 1997). RESULTS: 9,748 air or nitrox dive profiles by 1,437 divers were suitable for risk estimation. The distribution of estimated risk over all dives (figure on page 58 of supplement) suggests that 57 DCS incidents would have been expected. 51 divers reported symptoms judged unrelated to decompression. 3 divers with pain, tingling, and swelling were recompressed with presumed DCS. 8 divers with tingling, limb pain, and numbness were not recompressed. These symptoms were called "Ambiguous" as they had no obvious cause and were consistent with DCS. The 3 recompressed divers had maximum estimated DCS risks of 0.8, 1.5, and 3.7% ('O' in the figure). The 8 "Ambiguous" divers had a mean maximum risk of 1.1±0.5% (range 0.5-1.8%; '+' in the figure). DISCUSSION: DCS appeared to occur in higher risk dives suggesting that estimated risk was a useful measure of severity. The estimated number of incidents, however, was greater than the recompressed and "Ambiguous" cases together. This disparity has at least two explanations: (a) DCS was underreported in PDE; and (b) the DCS model overestimated the true number of incidents.
Description: Undersea and Hyperbaric Medical Society, Inc. (http://www.uhms.org)
URI: http://archive.rubicon-foundation.org/6768
Date: 2000

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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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