Editor's note: CNN's Chief Medical Correspondent Dr. Sanjay Gupta is a practicing trauma neurosurgeon and associate chief of neurosurgery at Grady Memorial Hospital in Atlanta.
Dr. Sanjay Gupta
CNN Chief Medical Correspondent
(CNN) - Rep. Gabrielle Giffords is in critical condition on a ventilator after being shot through the back of the left side of her head, yet doctors are “cautiously optimistic” about her survival. That she is alive at all is surprising to many people, but people survive these types of injuries more often than you may think.
While every patient and injury is different, on average – around 2/3 of patients with a gunshot wound (GSW) to the head don’t live long enough to make it to the hospital. Of the third that do make it, only 50% of those patients survive longer than 30 days. And of course, those numbers say nothing of long-term neurological function in the survivors.
So far, according to her doctors, Giffords is likely to be in the small minority of patients who will beat the odds. So, what placed those odds in her favor?
First off, she received very quick care, and was in the operating room within 38 minutes after arriving at the hospital. Her overall health and youth also provide some benefit. The injury was a “through and through” injury, meaning there was both an entry and exit wound. That’s significant because some of the energy of the bullet was dissipated into space, as opposed to all within her cranial cavity.
Neurosurgeons will want to know if the bullet passed across the midline of the brain. If it does, there is a much poorer likelihood of survival. In Giffords' case, it did not. Other positive factors: Her blood pressure didn't drop as a result of the bleeding, and the oxygen supply in her body was maintained, according to her doctors that I interviewed.
Finally, the fact Giffords was “following commands” even before she had an operation was a very positive sign.
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