Abstract
1) To measure nitric oxide (NO) metabolite levels in patients presenting to the ED in acute vaso-occlusive sickle-cell crisis (SCC), and 2) to determine whether a relationship exists between NO metabolite levels and pain. A prospective, observational study of patients with documented sickle-cell anemia (SCA), aged > or = 18 years, presenting in typical, acute SCC was conducted in an urban, university teaching hospital. Excluded were those with atypical pain or acute, coexistent disease (as evidenced by fever, tachycardia, tachypnea, or hypotension). Pain scores were measured by a 10-cm visual analog scale (VAS). Blood NO metabolite levels for SCC patients and control subjects (healthy volunteers, n = 9; SCA control subjects not in SCC, n = 10) were determined using an NO-specific chemiluminescence technique that measured plasma nitrite and nitrate, the stable end-products of NO. The acute SCC patients were divided into 3 groups, with the range for the SCC-normal (n = 5) group defined as within 2 SD of the healthy volunteer control patients. The SCC-low patients (n = 21) had NO metabolite levels below this range and the SCC-high (n = 21) patients had levels above this range. The SCA and healthy volunteer control groups had simil...Continue Reading
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