Scripture please. Was the doctor there at Calvary, the Bible doesn't mention his name.
Sorry, I forgot. Jn. 19:34 -- no doctor needed, explains itself. Use Google on "pericardial edema" . IIRC a well-known response of athletes to extreme muscular effort, congestive heart failure w/ pulmonary edema
The pericardium of a normal person would not be so productive as was described when the side of Jesus was pierced. The medical analysis below suggests the musculature of the heart was being compressed by the fluids collecting in the pericardium and the chest cavity generally. And the heart was further stressed because dehydration was forcing it to pump a more viscous quality of blood:
http://www.freerepublic.com/focus/news/1115727/posts
BTW, the nearest we have to a doctor on site was Luke, and of course he was not actually there. But God has provided to us, through Luke and others, a record of the physical traumas and visible symptoms Jesus experienced, such as Luke’s unique observation of the bloody sweat. Furthermore, there is substantial historical and direct experimental evidence to aid us in understanding how the biophysics of a crucifixion would proceed.
In court, a well qualified expert witness can and often does give useful testimony in their domain of expertise without necessarily having been present at the event in question. So the lack of a doctor at the foot of the cross is not an insurmountable hindrance to developing a good understanding of what Christ was experiencing physically as He died for us.
This is some ASSUMPTION that a nameless doctor has made - he(she?) really doesn't have to be in the BIBLE for his(her?) opinion to get stuck in folks mind.
(There's a LOT of that going on you know...)