title: A comparison of nitroglycerin and nitroprusside for inducing hypotension in children: a double-blind study.
abstract: Intravenous nitroglycerin (NTG) and sodium nitroprusside (SNP) were compared as hypotensive agents in anesthetized children and adolescents. The drugs were studied in a prospective, randomized, double-blind fashion in 14 patients anesthetized with nitrous oxide: oxygen, morphine, and thiopental. NTG in doses as high as 40 micrograms X kg-1 X min-1 was ineffective at decreasing mean arterial pressure (MAP) below 55 mmHg or causing a decrease in MAP greater than one-third of baseline values. SNP was uniformly successful at inducing hypotension in all patients, including those patients in whom NTG failed. The dose of SNP required to induce hypotension was 6-8 micrograms X kg-1 X min-1. Both NTG and SNP decreased systemic vascular resistance, although SNP did so to a much greater degree than NTG (64% vs. 29%; P less than 0.01). Only SNP increased cardiac index significantly (2.27 +/- 0.35 to 4.44 +/- 1.36; P less than 0.003). Both drugs reflexly increased heart rate, necessitating the use of intravenous propranolol (range from 1 to 3 mg) in all patients. Both drugs produced small decreases in arterial oxygen tension and increases in the average alveolar-arterial oxygen tension gradient (SNP, 44 +/- 13 vs. NTG, 41 +/- 6). SNP use was associated with a slight metabolic acidosis (pH = 7.38 +/- 0.01; base excess [BE] = -6 +/- 1). Neither drug produced any other untoward reaction. SNP appears to be the agent of choice for the reliable and sustained induction of deliberate hypotension in children and adolescents.
mesh_terms: D000293:Adolescent; D000769:Anesthesia, Inhalation; D001784:Blood Gas Analysis; D002648:Child; D004311:Double-Blind Method; D005073:Evoked Potentials, Somatosensory / Q000187:drug effects; D005292:Ferricyanides / Q000627:therapeutic use*; D006339:Heart Rate / Q000187:drug effects; D006801:Humans; D007022:Hypotension / Q000139:chemically induced*; D005996:Nitroglycerin / Q000627:therapeutic use*; D009599:Nitroprusside / Q000627:therapeutic use*
chemical_list: D005292:Ferricyanides; D009599:Nitroprusside; D005996:Nitroglycerin