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| Title: | ACUTE MANIPULATION OF DIETARY FAT AND FORMATION OF VENOUS GAS EMBOLI (VGE) AFTER DIVING |
| Authors: | Curry, TB
Lundgren, CEG |
| Keywords: | decompression
hyperbaric
air
chamber
VENOUS GAS EMBOLI
diet |
| Issue Date: | 1997 |
| Abstract: | BACKGROUND: A review of the literature shows no consensus as to the role of dietary fat on the susceptibility of persons to decompression sickness. However, no systematic attempt seems to have been made earlier to manipulate blood triglyceride (TG) levels and look for changes in VGE formation in divers. This is a preliminary report of such a study using Doppler ultrasound to quantify VGE formation. METHODS: Six certified SCUBA divers were given a medical workup, which included a contrast echocardiogram to rule out the presence of a patent foramen ovale. After an overnight fast, each subject consumed a test meal of heavy cream consisting of 75 g fat/m2 body surface area or an equivolume control meal of skim milk containing less than 3 g fat. After digesting for 3 hours, the subjects were exposed in a hyperbaric chamber to a test dive of 150 fsw (560.8 kPa) with a bottom time of 30 min and decompressed according to USN Air Decompression tables. Six dives were performed by each subject, 3 after a high fat meal and 3 after a control meal, in random order. Doppler monitoring was begun at the decompression stop at 10 fsw (131.9 kPa) and was repeated every 20 min for 120 min. Venous blood samples were taken after fasting, before and after the dive, and at the end of the experiment and analyzed for plasma TG concentrations. RESULTS: To date, 24 out of a planned 36 experiments have been completed. The fat loading meal increased plasma blood TG concentrations an average of more than 2.5 times those of fasting and control levels. All subjects exhibited Doppler bubble grades of at least grade II (Kisman-Masurel scale) in each experiment. Nonparametric analysis revealed no correlation (P greater than 0.3) for the group or individuals between fasting, peak, and percent change in plasma TG levels and maximum bubble grade (defined as the maximum grade recorded from all monitoring periods for entire dive). CONCLUSIONS (TENTATIVE): Postprandial lipemia does not affect VGE formation after decompression and, consequently, may not affect the susceptibility of individuals to decompression illness. [Supported in part by NOAA aware # R-DP5 to Research Foundation of the State University of New York for New York State Sea Grant Institute]. |
| Description: | Undersea and Hyperbaric Medical Society, Inc. (http://www.uhms.org ) |
| URI: | http://archive.rubicon-foundation.org/340 |
| Appears in Collections: | UHMS Meeting Abstracts
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