Clinical Impact of the Withdrawal of Nitrate in Patients With Stable Angina


Hospital de Clinicas de Porto Alegre

Status and phase

Phase 4


Myocardial Ischemia
Quality of Life
Stable Angina


Drug: Nitrate
Drug: Placebo

Study type


Funder types



GPPG 08-168

Details and patient eligibility


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.

Full description

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.


95 patients




18+ years old


No Healthy Volunteers

Inclusion criteria

  • Patients of both sexes, aged 18 years or above, with coronary artery disease documented by angiography or noninvasive test (scintigraphy) with stable angina functional class I or II of the Canadian Cardiothoracic Society (CCS), clinically stable for at least six months, using two or more antianginal agents (betablockers or calcium channel antagonist), among them nitrate fixed.

Exclusion criteria

  • Patients with residence far from the research center and unable to appropriate follow-up. Patients with decompensated heart failure symptoms or class III or IV New York Heart Association (NYHA), poorly controlled hypertension (BP greater than 160/90 mmHg), patients unable to walk or perform stress test and ECG interpretable. Also excluded were patients in the exercise test pre-randomization present significant alterations.

Trial design

Primary purpose




Interventional model

Parallel Assignment


Quadruple Blind

95 participants in 2 patient groups, including a placebo group

oral nitrate
Active Comparator group
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.
Drug: Nitrate
Placebo Comparator group
In the placebo group will be given the same dose and frequency prescribed nitrate.
Drug: Placebo

Trial contacts and locations



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