Asian Diver (English) - - Exhibitor Listings -

that the term de­com­pres­sion ill­ness (DCI) in­cludes both de­com­pres­sion sick­ness (DCS), re­sult­ing from dis­solved ni­tro­gen (or another in­ert gas) be­ing elim­i­nated from a diver’s body tis­sues, and ar­te­rial gas em­bolism (AGE), which is caused by air en­ter­ing the ar­te­rial blood as a re­sult of a burst lung Divers who get DCI have often been div­ing within the lim­its of their dive com­puter or ta­bles. The risk of DCI in­creases upon ex­ceed­ing these lim­its, which in­di­cates that the lim­its can­not ac­cu­rately ac­count for in­di­vid­ual dif­fer­ences be­tween divers and the var­i­ous fac­tors that can in­flu­ence ni­tro­gen up­take and elim­i­na­tion dur­ing a dive. All divers should add con­ser­vatism to their de­com­pres­sion cal­cu­la­tions, es­pe­cially if the div­ing is purely recre­ational and dive time doesn’t need to be max­imised

Many dive op­er­a­tors in re­mote ar­eas do not have ac­cess to a suf­fi­cient sup­ply of oxy­gen. It can some­times take over 24 hours for an evac­u­a­tion team to reach some re­mote lo­ca­tions, so a large sup­ply of oxy­gen is re­quired to last un­til an in­jured diver re­ceives ap­pro­pri­ate med­i­cal care. Check this out be­fore go­ing on a trip to an area with­out good ac­cess to suit­able med­i­cal fa­cil­i­ties This is often as­so­ci­ated with the pres­ence of a patent fora­men ovale (PFO). Skin-re­lated DCI used to be rel­a­tively un­com­mon in recre­ational divers, but in more re­cent years, it has be­come far more com­mon. Part of the rea­son for this could be the re­sult of the more fre­quent and longer dives and shorter sur­face in­ter­vals en­abled by dive com­put­ers It used to be thought that one had to dive deeper than 10 me­tres be­fore DCS was a risk, but this is now known to be un­true – some divers have suf­fered from DCS af­ter as­cend­ing from six or seven me­tres. Caused by repet­i­tive and deep dives, these bub­bles can be de­tected us­ing ul­tra­sound, and usu­ally do not cause symp­toms. Some divers “bub­ble” more than oth­ers. A slow as­cent rate and do­ing a safety stop re­duces the amount of bub­bling and there­fore the risk of DCI Divers with a patent fora­men ovale (PFO), which is a com­mon heart de­fect that can en­able blood to flow across the heart, have a sig­nif­i­cantly higher risk of DCI (some­times quoted as two to eight times, de­pend­ing on the size of the hole). Other fac­tors such as be­ing over­weight, age, lack of fit­ness, and de­hy­dra­tion may also play a role, although there is lit­tle hard ev­i­dence to sup­port some of these be­liefs Oxy­gen first aid is very im­por­tant in the man­age­ment of DCI, but it is often de­layed and given us­ing un­suit­able equip­ment for a short pe­riod. To max­imise the ben­e­fit, near100 per­cent oxy­gen should be given from the time symp­toms first oc­cur, and should be con­tin­ued un­til a div­ing doc­tor ad­vises that it be stopped

By John Lipp­man of Divers Alert Net­work Asia Pa­cific

Newspapers in English

Newspapers from Cambodia

© PressReader. All rights reserved.