Treatment of Coronary Heart Disease With Amiloride

June 8, 2012 updated by: Antonio Delgado Leon, MD, University of Carabobo

Comparative Randomized Single-blind Trial of Amiloride in Coronary Heart Disease

Treatment of coronary artery disease is a major health care problem across the entire word, and the United States. Unfortunately, despite a number of medical advances, diagnostic procedure, or epidemiological studies, the treatment of these patients remain complex, and and at times frustrating. In fact, the COURAGE trial conducted in 50 centers across United States and Canada documented that drug treatment, coronary interventions or both were not effective solution in coronary artery diseases.

A novel approach has recently been developed, based on the critical role of the potassium (K) content in red-blood-cell in myocardial oxygenation, since oxygen and K binding by hemoglobin (red-blood-cell) occurs simultaneously in blood passing through the lungs, whereas in the organs as the heart, the hemoglobin release both Oxygen and K ions.

This apparently simple mechanisms occurs in human blood in all individuals but could be altered in subjects with acquired or hereditable defect in red-blood-cell K content. The purpose of this trial, thus, will be to evaluate the pharmacological effects of Amiloride on RBC K-uptake and transport and its impact on reversion of angina, electrocardiographic changes of myocardial ischemia and electrical regeneration of the heart in subjects with coronary artery diseases.

Study Overview

Status

Completed

Conditions

Intervention / Treatment

Detailed Description

The Problem: Treatment of Cardiovascular Diseases (CVD) is a major health care problem across the entire word, and particularly in the United States, Japan and European Countries (1). In fact, these life-threatening disorders are a major cause of emergency medical care and hospitalization in the United States, and according the National Center for Health Statistics (NCHS) there were approximately 1,565,000 hospitalizations for primary or secondary diagnosis of an acute coronary syndrome (ACS), 669,000 for unstable angina (UA) and 896,000 for myocardial infarction (MI). In the 2003, NCHS reported 4,497,000 visits to emergency departments for primary diagnosis of CVD, wherein the average age of a person having a first heart attack is calculated at 65.8 years for men and 70.4 years for women (2)

Although the treatment of angina, chest pain secondary to coronary heart disease (stable chronic angina) and one of the most common and early symptom of Coronary Heart Disease (CHD) can be tracked as far as 1880's, it still represents a medically unresolved problem. Indeed, treatment of angina in particular, as well as associated condition as ACS, UA, and MI, involves a large number of life-style recommendations, dietetic advice, drugs, coronary artery intervention, or coronary bypass surgery aimed to improve symptoms, quality of life of patients, and even primary or secondary prevention of the stable chronic angina. Unfortunately, despite a century of medical advances and epidemiological studies, the current approach to CVD and coronary heart disease remain complex, and at times frustrating.

Among the proposals to treat stable chronic angina new aspects have been considered, including the single "polypill" agent (aspirin + statin + 3 blood pressure lowering agents in half dose, and folic acid), Simvastatin and intravascular ultrasound study, or intra-coronary angiogenesis therapy (3-5). However, most of them are unpractical, whereas it is difficult to determine whether these changes will translate to meaningful reductions in clinical events, or whether results in highly selected patient populations can be matched to the real-world of prevention and treatment of coronary artery syndromes.

Further, a recent large clinical trial, COURAGE study (6), conducted in 50 hospital centers in the United States and Canada showed that optimal drug treatment and percutaneous coronary interventions for stable coronary heart disease, was not more effective than optimal medical therapy alone for preventing cardiovascular events, hospitalization or death, suggesting that drugs, surgical procedures or both were not a statistically effective solution for stable chronic angina. By inference, a therapeutic approach for mot severe coronary syndromes as UA, post- myocardial infarction angina, or aggravated angina episodes, seems to be a more distant goal.

Physiological Basis for Innovation: For more than a century, the extremely rapid coupled tissue O2/CO2 gas exchange and ion H/K transport by Hemoglobin (Hb) in red blood cell (RBC) has been well known for scientific community, the so-called Bohr/Haldane Effect (7). Since then, it has been noted and confirmed that RBC have a critical role to maintain normal vascular function, blood flow and tissue oxygenation and acid-base regulation. These functional roles of RBC include a nitric oxide (NO) transport, NO synthetasa, and regulation of platelet aggregation, vascular rheology, and endothelial function (8). Indeed, recent studies have demonstrated that erythrocyte serves as a regulator of vascular tone and tissue perfusion, whereas the hemoglobin and RBC itself may be sensors for the oxygen tissue requirement (9).

In this context, the evidence that erythrocytes are the major intravascular storage of nitrites (10), and that nitroglycerin effects on erythrocyte rheology and oxygen unloading in myocardial ischemia are mediated by S-Nitrosohemoglobin (11) implies that RBC K exchange should be preserved in subjects with CHD, especially if a hereditable defect in RBC K transport exists (12). Unfortunately, and despite such multiple integrated functions to maintain tissue oxygenation in health and diseases states, the role of RBC has never been considered in the therapeutic approach of stable chronic angina (13). However, our recent observation that reversal of an abnormal low RBC K content in hypertensive patients receiving low doses of pyrazinoylguanidine hydrochloride (amiloride HCl, 5 mg), and calcium gluconolactate was associated with a better control of BP, and regression of the ST-T alterations related to LVH or coronary heart disease (14), strongly support a novel mechanistic approaches to improve blood flow and myocardium oxygen transport in stable chronic angina.

Informed consent will be obtained in each patient, and the Review board committee of the Docent Institute of Urology, University of Carabobo Medical School, Valencia, will approve the trial. This trial is a continuation of the Protocol ID UIC-3 2007 (Novel Treatment for Coronary Artery Disease, NCT 01228214) and will be also registered in the ClinicalTrials.gov

METHODS

(I) Clinical Methods

At the inclusion period and in each clinical visit all subjects had measurements of BP, HR, body weight/height and measurement of body resistance and reactance for Body Composition Analysis of Total Body water and extra-cellular spaces, Fat-Free-Mass, Fat Mass. Number of anginal episodes, and functional anginal class (CCS) will be recorded in each case.

(II) Laboratory Methods

All patients will have routine measurement of Ion Transport Studies, which includes a 12-hour night (7 pm- 7 am) urine collection, followed by fasting state for measurement of plasma (Na, K, Cl, Mg++, Ionized calcium), RBC (Na, K, H2O content), and urine (Na, K, Cl, Mg++, calcium) electrolytes, along with plasma and urine osmolality, at entry, 4-week, and at 3, 8 and 12-months period.

(III) Cardiovascular Studies

All subjects All subjects had resting 12-lead ECG at entry, and non-invasive hemodynamic and PWA (DynaPulse200M, San Diego, CA) for Aortic Stiffness (Augmentation index, and Travel-Time-Reflected-Wave), Systemic and Brachial Artery Resistance and Compliances, obtained at entry and during clinical visits, including possible emergency attention. EchoC, or Doppler studies will be evaluated at baseline, 6-month, and 12-month periods.

Study Type

Interventional

Enrollment (Actual)

70

Phase

  • Phase 2
  • Phase 3

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Locations

  • Venezuela
    • Carabobo
      • Valencia, Carabobo, Venezuela, 2001
        • Hypertension Research Unit

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

35 years to 75 years (Adult, Older Adult)

Accepts Healthy Volunteers

No

Genders Eligible for Study

All

Description

Inclusion Criteria:

  1. Male or female; age 35-75 years having angina (Canada Cardiovascular Society Class II-IV)
  2. Essential Hypertension defined as taking at least 1 anti-hypertensive medication, or average systolic blood pressure ≥140 mm Hg, or diastolic blood pressure ≥90 mmHg
  3. ST-T changes of LVH (Romhilt-Estes or Framingham Heart Study criteria, with typical LV strain pattern, or isoelectric, inverted or biphasic T waves)
  4. ST-T changes of ischemia in resting ECG (ST depression, isoelectric, biphasic, negative or inverted T-waves)
  5. Serum potassium < 5.0 mmol/L prior to randomization
  6. Negative pregnancy test in child-bearing potential women
  7. Willing to comply with scheduled visits
  8. Informed consent form signed by the subject

Exclusion Criteria:

  1. Resistance hypertension despite 3-drugs treatment
  2. Myocardial infarction in past 90 days
  3. Coronary artery bypass graft surgery in past 90 days
  4. Atrial fibrillation with a resting heart rate > 90 bpm
  5. Percutaneous coronary intervention in past 30 days
  6. Implanted Pacemaker
  7. Stroke in past 90 days
  8. Left or Right Ventricular Branch Block
  9. Aldosterone antagonist or K sparing drug in last 7 days
  10. Intolerance to amiloride
  11. Lithium use
  12. Current participation in any other therapeutic trial
  13. Any condition that may prevent the subject from adhering to the trial protocol
  14. History of hyperkalemia (K ≥5.5 mmol/L) in the past six months or K >5.0 mmol/L within 2 weeks
  15. Chronic renal dysfunction
  16. Liver disease
  17. Chronic pulmonary disease
  18. Significant uncorrected valvular heart disease

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Treatment
  • Allocation: Randomized
  • Interventional Model: Parallel Assignment
  • Masking: Single

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
Experimental: Amiloride,nitrates,clopidogrel,aspirin,statins
Comparative Efficacious Research
Drug: Amiloride
5mg/daily for 12th months
Other Names:
  • Nitrates (40mg/daily) for 12 months
  • Clopidogrel(75mg/daily)for 12 months
  • Aspirin (80mg/daily) for 12 months
  • Statins (20mg/daily) for 12 months
Active Comparator: Nitrates, clopidogrel, aspirin, statins
Comparative Efficacious Research
Drug: Nitrates, clopidogrel, aspirin, statins
Comparative Efficacious Research
Other Names:
  • Nitrates (40mg/daily) for 12 months
  • Clopidogrel(75mg/daily)for 12 months
  • Aspirin (80mg/daily) for 12 months
  • Statins (20mg/daily) for 12 months

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Regression of Angina without Recurrence
Time Frame: Baseline, and every 6-months therafter
Evaluation of Angina Class according Canadian Cardiology Society (CCS)
Baseline, and every 6-months therafter
Regression of ST-T and T-waves alterations of Myocardial Ischemia
Time Frame: Baseline and every 6-months thereafter
Evaluation according Minnesota Code
Baseline and every 6-months thereafter
RBC K Content
Time Frame: Baseline and very 6-Months thereafter
Obtained by a novel accurate method developed in our laboratory (Nutr Metab Cardiovasc Dis. 2002 Jun;12(3):112-116
Baseline and very 6-Months thereafter

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

University of Carabobo

Collaborators

Northern Metropolitan Hospital
Venezuelan Foundation of Heart Failure
Clinical Research Unit at the Docent Institute of Urology

Publications and helpful links

The person responsible for entering information about the study voluntarily provides these publications. These may be about anything related to the study.

General Publications

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start

February 1, 2009

Primary Completion (Actual)

May 1, 2010

Study Completion (Actual)

February 1, 2011

Study Registration Dates

First Submitted

October 29, 2010

First Submitted That Met QC Criteria

October 29, 2010

First Posted (Estimate)

November 1, 2010

Study Record Updates

Last Update Posted (Estimate)

June 11, 2012

Last Update Submitted That Met QC Criteria

June 8, 2012

Last Verified

April 1, 2012

More Information

Terms related to this study

Additional Relevant MeSH Terms

Other Study ID Numbers

  • UIC-5 2008

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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