Clinical Impact of the Withdrawal of Nitrate in Patients With Stable Angina
Chronic treatment of stable angina with nitrates long and short action is extremely frequent. In clinical practice the most commonly observed is a combination of anti-anginal agents, usually including nitrates fixed in an attempt to improve the quality of life of patients, which is not always met with success.
Numerous questions and problems are seen with chronic use of oral nitrates. From a practical standpoint, some advocate the withdrawal of medication in stable patients, while many physicians still hesitate to withdraw the medication by the lack of definitive information about its consequences. In this sense there is a rationale for the attempted removal of nitrate fixed these patients, although evidence to support this action have not been adequately evaluated.
Quality of Life
|Study Design:||Allocation: Randomized
Endpoint Classification: Safety/Efficacy Study
Intervention Model: Parallel Assignment
Masking: Double Blind (Subject, Caregiver, Investigator, Outcomes Assessor)
Primary Purpose: Treatment
|Official Title:||Withdrawal of Nitrate in Patients With Stable Angina - Multicenter Clinical Trial|
- Time of exercise on treadmill test [ Time Frame: 4 months ] [ Designated as safety issue: Yes ]Evaluate exercise tolerance, time to onset of ischemia and total duration of exercise by exercise testing in patients with stable angina in withdrawal nitrate fixed.
- angina function class and time to ischemia on treadmill test [ Time Frame: 4 months ] [ Designated as safety issue: Yes ]Evaluate the occurrence of angina and/or worsening of functional class (CCS). Assess exercise tolerance and time to onset of ischemia (clinical and electrocardiographic parameters) and total exercise time, through the exercise test. Rate load silent ischemia through 24-hour Holter. Assess quality of life measured by questionnaire Short-Form 36 and Seattle and adherence to medication. Estimate the impact of the withdrawal of nitrate in the Unified Health System.
|Study Start Date:||September 2009|
|Study Completion Date:||December 2013|
|Primary Completion Date:||December 2013 (Final data collection date for primary outcome measure)|
Active Comparator: oral nitrate
In nitrate group will be provided the same prescribed dose for this drug. One group remains on nitrate use and other on placebo (same number of pills) use.
Two arms: placebo and nitrate
Other Name: Isosorbide
Placebo Comparator: Placebo
In the placebo group will be given the same dose and frequency prescribed nitrate.
The Ischemic Heart Disease remains in recent years as a major cause of mortality in most of the world, and also the disease that consumes more resources in health in industrialized countries. The use of fixed nitrate in patients with stable angina is quite common, but there is a scarcity of studies showing the need for this medication in this class pacientes.Este study aims to evaluate the consequences of the withdrawal of fixed nitrate in patients with stable angina class I and II, hemodynamically stable for the past six months, as the frequency and duration of episodes of angina, silent ischemia and functional capacity by exercise testing, 24-hour Holter and measurement of quality of life and adherence to therapy. For this purpose, a randomized blinded multicenter clinical trial was designed to placebo (intervention group) X nitrate (control group) in a follow-up period for 4 months. Both groups will receive three evaluations (baseline, 30 days and 120 days) during follow-up.
|Hospital de Clínicas de Porto Alegre|
|Porto Alegre, RS, Brazil, 90035-903|
|Principal Investigator:||Carisi A Polanczyk, MD, ScD||Federal University of Rio Grande do Sul|