[abstract] Intravascular bubbles and diving patterns in Japanese Ama divers

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[abstract] Intravascular bubbles and diving patterns in Japanese Ama divers

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Title: [abstract] Intravascular bubbles and diving patterns in Japanese Ama divers
Author: Kohshi, K; Lemaitre, F; Tamaki, H; Nakayasu, K; Harada, M; Okayama, M; Satou, Y; Hoshiko, M; Ishitake, T; Wong, RM
Abstract: Background: Decompression illness (DCI) in commercial breath-hold (Ama) divers has been reported from a few districts of Japan. The aim of this study was to detect circulating bubbles following repetitive breath-hold diving in the local area where neurological DCI often occurred among Ama divers. Methods: Participants were 12 male partially assisted Ama divers (descent using weights). The equipment (AQUALAB system) used continuous-wave Doppler with a frequency of 5 MHz; the Doppler probe was placed in the precordial site, with the ultrasonic wave being directed into the pulmonary infundibulum. We recorded intravascular bubbles immediately after continuous diving for three to four hours. The recordings were made on numerical tracks to be graded in a blind manner by two experienced investigators, according to the Spencer Doppler code. Results: All divers used 20-kg weights. Dive depths and numbers were 10-20 meters and 75-131 times. Descending, bottom and ascending times, and surface interval were 5-15, 40-60, 7-20 and 30-60 seconds, respectively. We detected intravascular bubbles (Spencer’s grade I) on an Ama diver whose mean surface interval was only 35 seconds. Four Ama divers had experienced neurological diving accidents that were all transient and recovered completely. Conclusion: Intravascular bubbles are formed after repetitive breath-hold diving with short surface interval and probably cause neurological DCI in Ama divers.
Description: Undersea and Hyperbaric Medicine : Journal of the Undersea and Hyperbaric Medical Society, Inc.
URI: http://archive.rubicon-foundation.org/9894
Date: 2011

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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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