Slow enrollment

This study is designed to better understand the effects of nitric oxide, a gas for inhalation, on patients with right ventricular infarction.

This is a prospective, randomized, double-blind, placebo-controlled study that will assess the feasibility of studying inhaled nitric oxide for the treatment of cardiogenic shock due to right ventricular infarction, and the dose response of the acute hemodynamic changes occurring with nitric oxide inhalation in these patients. Patients with evidence of right ventricular infarction and cardiogenic shock, and have angiographic evidence of impaired blood flow to the right ventricle, or if right ventricular coronary perfusion is unimpared, cardiac shock persists, will be eligible for enrollment. Patients will receive standard of care for their condition, and will also recieve either nitric oxide for inhalation or placebo for up to 14 days.

Inclusion Criteria:

• Acute inferior mycardial infarction (defined as an episode of chest pain lasting >30 minutes and electrocardiographic evidence of 1 mm or greater ST elevation in inferior leads) within the past 72 hours.
• Invasive hemodynamic evidence of hemodynamically-significant RV dysfunction, defined as the presence of all the following: systemic venous congestion (mean RA pressure > 10mmHg), the ratio of RA/PCW pressure 0.75 or greater, a low cardiac output as determined by Fick or Thermodilution (TD) technique (cardiac index < 2.5 l/min/m2), systolic systemic arterial blood pressure of 90mmHg or less or requiring vasopressor or mechanical support to maintain systolic pressure > 90mmHg. Patients with a PCWP of 14mmHg or less should receive intravascular volume repletion until their PCWP is > 14mmHg.
• Coronary angiography revealing either an occlusion of the RCA proximal to any RV marginal branch or evidence of diminished flow to RV marginal branches of the RCA.
• If patient undergoes coronary revascularization, there must be evidence of unsuccessful right ventricular reperfusion (lack of restoration of TIMI grade III flow in the distal RCA and > 1mm RV marginal branches) or evidence of hemodynamically significant RVI must persist for greater than 1 hour after successful revascularization.
• Age 18 years or greater

Exclusion Criteria:

• PCW 25mmHg or greater or mechanical complications of myocardial infarction requiring surgical correction.
• Severe LV systolic dysfunction as determined by the principal investigator. Unprotected left main coronary stenosis > 50%.
• Pulmonary infiltrates consistent with pulonary edema on chest X-ray (if chest X-ray is clinically indicated).
• Evidence of shock-related end-organ damage, including creatinine 3.0 or greater, metabolic acidosis (pH 7.1 or less) and not corrected by 100 ml NaHCO3 (1mEq/ml), disseminated intravascular coagulation, or clinical evidence of diffuse brain injury.
• Previous history of severe pericardial, congenital, or valvular heart disease.
• Refractory hemodynamically significant arrhythmia.
• Presence of pneumonia, adult respiratory distress syndrome, or sepsis.
• Prior history of pulmonary disease requiring chronic oxygen therapy.
• Pregnancy
• Use of investigational drugs or device within the 30 days prior to enrollment to the study.
• Uncontrolled active bleeding.