Tropics Diver
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Cause and effect is a good question. My personal guess is that the most significant factor is that many of the divers haven't been diving recently. Their "first day of diving", whether it is the day or arrival, the next day, or even the day after that is when they are most likely to have problems.pasley once bubbled...
I assume you read the DAN article on flying and diving. "...Of the 88 cases reviewed from the Caribbean for 1994, 33 -- or 37.5 percent -- occurred on the first day. The remainder occurred on days two through seven..." http://www.diversalertnetwork.org/medical/faq/faq.asp?faqid=56
Dehydration and fatigue are increased risk factors for DCI.
Admittedly it is too small a sampling to determine cause and effect. But 37%, that is a good argument to me to not dive the same day I arrive, but to rest and re-hydrate.
It's not clear from your quote what DAN means by "first day", but it probably means the first dive day, independent of whether or not it is the day of arrival.
My recommendation is to do a nice, shallow, non-challenging shore dive to get back in the groove.