[abstract] PROVOCATIVE REPETITIVE DIVES OF 120-MIN VS. 25-MIN DURATION: A GREATER RISK OF DYSBARIC OSTEONECROSIS IN LONGER DIVES?

Rubicon Research Repository/Manakin Repository

[abstract] PROVOCATIVE REPETITIVE DIVES OF 120-MIN VS. 25-MIN DURATION: A GREATER RISK OF DYSBARIC OSTEONECROSIS IN LONGER DIVES?

Show full item record


Title: [abstract] PROVOCATIVE REPETITIVE DIVES OF 120-MIN VS. 25-MIN DURATION: A GREATER RISK OF DYSBARIC OSTEONECROSIS IN LONGER DIVES?
Author: Lehner, CE; Wilson, MA; Dueland, RT; Nordheim, EV; Vaicekavicius, L; Crump, PM; Gendron-Fitzpatrick, AP; Repa, SC; Quigley, PD
Abstract: BACKGROUND: Dysbaric osteonecrosis (DON) is a form of decompression injury that affects the long bones of tunnel workers and deep-sea divers and may cause disabling osteoarthritis. DON often develops at the site of persistent limb bends. Relatively brief repetitive dives may promote the cumulative uptake of dissolved N2 in the diver's long bones and lead to bubble formation, limb bends, tissue ischemia, and DON with disabling osteoarthritis. Do prolonged repetitive dives carry a higher risk of DON than brief, repetitive dives with similar decompression sickness (DCS) risks? METHODS: We used adult sheep to evaluate DON risk in provocative repetitive dives. Twelve sheep were randomly grouped for either shallow (n = 8) or deep (n = 4) dives. Most experienced more than 20 hyperbaric exposures with 30 fsw/min (0.9 atm/min) decompressions over 11-22 months to emulate the avid scuba diver. Repetitive dives (2/day) were either relatively deep (101 to 113 fsw; 4.06 to 4.40 atm abs) or shallow (45 to 59 fsw; 2.36 to 2.77 atm abs), with 25-min and 120-min dive durations, and with 2-h and 1-h surface intervals, respectively. We monitored for DCS and DON, after IV administration of alizarin complexone fluorochrome (bone formation marker). Deep and shallow dive groups were analyzed for DON severity by ANOVA. RESULTS: Dysbaric osteonecrosis occurred in sheep exposed to both short deep and long shallow repetitive dives, although DON severity was generally greater in the long, shallow group than in the short, deep dive group (P less than 0.03 to 0.07). CONCLUSIONS: Relatively brief repetitive dives can induce DON, but longer dives generally increase the risk of DON. These findings suggest that divers with limb bends should seek prompt recompression treatment to prevent DON, and that divers should avoid repetitive dives with a significant limb bends risk. (Research was funded by the UW Sea Grant Institute.)
Description: Undersea and Hyperbaric Medical Society, Inc. (http://www.uhms.org )
URI: http://archive.rubicon-foundation.org/901
Date: 2001

Files in this item

Files Size Format View
abstract.txt 259bytes Text file View/Open

This item appears in the following Collection(s)

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

Show full item record

Browse

My Account