Lack of improvement was defined as a difference between the NIHSS score at baseline and at 24 hours of 3 points or less. Poor outcome at 3 months was defined by a modified Rankin Scale score of 3 to 5 or death.
After adjusting for age, gender, and stroke severity, hyperglycemia at admission (glucose > 144 mg/dL), cortical involvement, and time to treatment were independent predictors of lack of improvement at 24 hours. After adjusting for age, gender, and stroke severity, lack of improvement at 24 hours was an independent predictor of poor outcome and death at 3 months. Patients with lack of improvement at 24 hours also had longer lengths of hospitalization.
9. Taylor AL, Ziesche S, Yancy C, et al. Combination of isosorbide dinitrate and hydralazine in blacks with heart failure. N Engl J Med. 2004;351:2049-57.
Neurohormonal changes, endothelial dysfunction, impaired nitric oxide availability, and oxidant stress all contribute to the structural remodeling of the left ventricle in congestive heart failure. The combination of isosorbide dinitrate, an organic nitrate that stimulates nitric oxide signaling, and the antioxidant and vasodilator hydralazine improves survival in heart failure. Based on more recent data that black patients have a clinically significant response to this combination therapy, the authors of the African-American Heart Failure Trial (A-HeFT) evaluated 1050 black patients with congestive heart failure in a randomized, double-blind, placebo controlled trial. Patients were randomized to fixed doses of isosorbide dinitrate and hydralazine plus background therapy (i.e., digoxin, ACE inhibitors, beta-blockers, diuretics, angiotensin receptor blockers) or to placebo plus background therapy. After 18 months, the trial was stopped due to a significantly higher mortality rate in the placebo group (10.2% in the placebo group vs. 6.2% with combination
therapy, p=.02); survival differences emerged at 180 days and increased progressively thereafter. The combination therapy group reported more headache and dizziness but suffered fewer exacerbations of congestive heart failure and reported improvement in subjective assessments of quality of life as measured by questionnaires. Accompanying editorials discuss the role of nitric oxide and prevention of oxidative stress in the treatment of heart failure, as well as the controversial issues surrounding race-based therapeutics.