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Inhaling nitric oxide eases pain crises in sickle cell patients
Date:10/19/2010

AUGUSTA, Ga. Inhaling nitric oxide appears to safely and effectively reduce pain crises in adults with sickle cell disease, researchers report.

A study of 18 patients in Atlanta, Chicago and Detroit showed that the nine inhaling nitric oxide for four hours had better pain control than those receiving only the standard self-administered morphine, said Dr. C. Alvin Head, chairman of the Department of Anesthesiology at the Medical College of Georgia School of Medicine.

"This study shows that you can breathe the gas and have less pain, which is the major reason sickle cell patients are admitted to the hospital," said Head, corresponding author of the study published in the American Journal of Hematology.

A larger study will help define the optimal dose as well as timing and duration for the treatment, Head said. If findings continue to hold, he envisions sickle cell patients, much like asthmatics, having nitric oxide inhalers handy to forestall a full-blown pain crisis. The pain results when sickle cell patients' abnormally shaped hemoglobin impedes oxygen delivery.

"By the time you see a patient in the emergency room or the clinic, they have a significant amount of pain and you are always playing catch-up," Head said. "The idea would be to use this as early as possible."

While it's not certain how nitric oxide helps, Head has laboratory evidence and some early clinical indications that nitric oxide, which has a great affinity for hemoglobin, restore's hemoglobin's natural shape and charge. The more normal negative charge helps cells repel each other, melts sticky polymers and may prevent new ones from forming. In fact, he suspects that one of nitric oxide's usual duties in the body is to help prevent clot formation.

"If you have pain relief without more narcotic then we must be attacking the problem," Head noted. The study participants receiving nitric oxide use slightly less morphine than the control group and continued to exper
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Contact: Toni Baker
tbaker@mcg.edu
706-721-4421
Medical College of Georgia
Source:Eurekalert  

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