Effect of Ranolazine on Myocardial Perfusion Assessed by Serial Quantitative Exercise SPECT Imaging

Gilead Sciences81 enrolled

Overview

This study enrolled participants with documented exercise-induced myocardial ischemia in order to evaluate whether ranolazine, when taken prior to exercise, can improve blood flow to the heart (myocardial perfusion), as assessed by exercise-induced myocardial perfusion defect size (PDS) and total perfusion deficit (TPD), using gated single photon emission computed tomography (SPECT) myocardial perfusion imaging (MPI). This was a 2-period crossover study. The last dose of each period must have been taken 3-4 hours prior to conduct of the exercise SPECT MPI. After the research exercise SPECT MPI was performed at the end of Period 1, participants discontinued the treatment they were randomized to for that period and began the other treatment in Period 2.

Study Type

INTERVENTIONAL

Allocation

RANDOMIZED

Purpose

TREATMENT

Masking

DOUBLE

Enrollment

Conditions

Myocardial Perfusion Imaging Myocardial Ischemia

Interventions

SPECT MPIPROCEDURE

Gated single photon emission computed tomography (SPECT) myocardial perfusion imaging (MPI) to confirm the presence of reversible exercise-induced left ventricular perfusion defect size (PDS) performed within 12 weeks prior to baseline or at the baseline visit, and at the end-of-period 1 and end-of-period 2 visits.

Eligibility

Sex: ALLMin age: 18 Years

Medical Language ↔ Plain English

Key Inclusion Criteria: * Exercise SPECT MPI study (stress and rest) showing at least 10% reversible myocardial ischemia (as confirmed by the core nuclear laboratory using Corridor4DM imaging software) performed not more than 12 weeks prior to screening, OR * Exercise SPECT MPI study (stress and rest) conducted during screening (after consultation with the Medical Monitor and after informed consent was obtained) showing at least 10% reversible myocardial ischemia (as confirmed by the core nuclear laboratory) * Stable antianginal medical therapy (excluding short-acting nitroglycerin) Key Exclusion Criteria: * Left bundle branch block * Automated implantable defibrillator and/or pacemaker (selected subjects with permanent pacemakers who had an intact sinus mechanism may have been included following consultation with the Medical Monitor) * Intervening coronary revascularization between the time of qualifying exercise SPECT MPI study and randomization * Acute myocardial infarction (MI) within 60 days prior to screening or at any time after the qualifying exercise SPECT MPI study, or MI undergoing staged intervention during a subject's participation in the trial * Unstable angina within 30 days prior to screening, or at any time after the qualifying exercise SPECT MPI study * Coronary artery bypass graft surgery within 60 days prior to screening or at any time after the qualifying exercise SPECT MPI study, or percutaneous coronary intervention within 30 days prior to screening or at any time after the qualifying exercise SPECT MPI study * Anticipated coronary revascularization during the trial period * Cerebrovascular attack or transient ischemic attack within 90 days prior to screening * History of serious arrhythmias * Current atrial fibrillation or atrial flutter * QTc interval \> 500 milliseconds * Diagnosed as having New York Heart Association Class III or IV heart failure * Inability to exercise or exercise limitation due to other comorbidities that may have interfered with ability to perform required exercise SPECT MPI study * Body mass index greater than or equal to 38 kg/m\^2 (may have been up to 40 kg/m\^2 after consultation with the Medical Monitor) * Any absolute contraindications to exercise stress testing

Locations (43)

University of Alabama at Birmingham

Birmingham, Alabama, United States

Imperial Cardiac Center

Imperial, California, United States

Clinical Trials Research

Lincoln, California, United States

Mission Internal Medical Group

Mission Viejo, California, United States

Central Coast Cardiology

Salinas, California, United States

Outcomes

Primary Outcomes

Exercise-induced Perfusion Defect Size (PDS) Following Ranolazine and Placebo Treatment

PDS is the amount (percent) of the myocardium with decreased blood flow. A lower percentage means more of the myocardium is receiving blood flow. Measurements were obtained by gated single photon emission computed tomography (SPECT) imaging following exercise at the end of the ranolazine and placebo treatment periods.

Time frame: Up to 33 days

Exercise-induced Total Perfusion Deficit (TPD) Following Ranolazine and Placebo Treatment

TPD is a score that measures the overall impact of a region of decreased myocardial blood flow, incorporating both the amount and severity of the decreased flow. TPD is measured on a scale of 0-100, with higher scores being worse and lower scores being better. Measurements were obtained by SPECT imaging following exercise at the end of the ranolazine and placebo treatment periods.

Time frame: Up to 33 days

Secondary Outcomes

Perfusion Defect Severity at Baseline, End of Period 1, and End of Period 2

Perfusion defect severity was assessed for each participant as the percentage of the 17 myocardium segments with a relative perfusion defect score of 3 or 4 on a 0-4 scale. Segment scores are: 0 = normal perfusion; 1 = mild reduction in counts-not definitely abnormal; 2 = moderate reduction in counts-definitely abnormal; 3 = severe reduction in counts; 4 = absent uptake (lower scores correspond to less severity and higher scores correspond to increased severity). A lower percentage means fewer segments have severely reduced blood flow. Measurements were obtained by SPECT imaging following exercise at baseline and at the end of Periods 1 and 2.

Time frame: Up to 33 days

Exercise-induced Reversible Perfusion Defect Size (PDS) at Baseline, End of Period 1, and End of Period 2

Exercise-induced reversible PDS was derived as the exercise PDS at baseline and at the end of Periods 1 and 2 minus the resting PDS at baseline. A lower percentage means more of the myocardium is receiving blood flow. Measurements were obtained by SPECT imaging at baseline both at rest and following exercise and following exercise at the end of Periods 1 and 2.

Time frame: Up to 33 days

Exercise-induced Reversible Total Perfusion Deficit (TPD) at Baseline, End of Period 1, and End of Period 2

Exercise-induced reversible TPD was derived as the exercise TPD at baseline and at the end of Periods 1 and 2 minus the resting TPD at baseline. TPD is measured on a scale of 0-100, with higher scores being worse and lower scores being better. Measurements were obtained by SPECT imaging at baseline both at rest and following exercise and following exercise at the end of Periods 1 and 2.

Time frame: Up to 33 days