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CoEnzyme Q10 in Satin Myopathy

23:52 EDT 16th April 2014 | BioPortfolio

Summary

Statins (such as simvastatin or Zocor) are the most effective and widely prescribed medications to lower cholesterol levels and reduce the frequency of heart attacks, cardiac deaths and strokes. Unfortunately, statins can cause muscle discomfort or pain called "myalgia" in patients treated with these drugs. These symptoms often cause patients who need these medications to stop taking the drug. The cause of statin muscle pain is not known, but it is thought that a reduction of a vitamin-like substance called Coenzyme Q10 (CoQ10) during statin treatment may play a role. CoQ10 is a vitamin like substance and is not a drug approved and regulated by the Food and Drug Administration (FDA). This study will look at the effects of CoQ10 supplements on individuals who develop muscle symptoms while on simvastatin.

The investigators hope to test the hypothesis that CoQ10 supplementation compared to placebo in patients with documented statin myalgia reduces the intensity of pain during statin treatment.

Description

Study Overview: We estimate, based on the calculations detailed below that 80 subjects with documented statin myalgia will be required to test our hypothesis. Consequently, 135 patients with statin myopathic complaints will be recruited from the Cholesterol Management Center at Hartford Hospital, newspaper and radio advertisements and contact with physicians' offices. Subjects will be withdrawn from all lipid lowering medications for at least 4 weeks. Subjects will then have serum measured for baseline lipids, liver, kidney, and thyroid function, creatine kinase (CK) and CoQ10 values and be randomized to treatment with simvastatin 20 mg daily or matching placebo for up to 2 months. Subjects will be called weekly to assess symptoms. Blood measurements will be repeated and treatment (simvastatin or placebo) will stopped after 2 months or after subjects have experienced muscle symptoms continuously for one week. After 4 weeks, subjects will cross over to the alternative placebo or simvastatin treatment and the monitoring and measurement process will be repeated. Those patients developing myalgia during statin treatment, but not during placebo, will enter the CoQ10 study, again after 4 weeks off treatment. These subjects will have serum lipids, liver, CK and CoQ10 levels measured and undergo tests of muscle performance and exercise capacity. They will then be randomized to placebo or CoQ10 treatment arms, "loaded" with placebo or CoQ10 to ensure adequate tissue levels for two weeks, and then retreated with simvastatin 20 mg daily. Subjects will be called weekly to inquire about muscle symptoms. The primary endpoint will be the intensity of pain at eight weeks, or after subjects have had continuous symptoms for a week (or less in the case of intolerable symptoms), whichever comes first. We will also determine time in days to the onset of repeat myopathic symptoms and measure muscle performance including skeletal muscle strength and endurance and maximal aerobic exercise capacity using techniques used in our present NIH funded research project The Effect of Statins on Skeletal Muscle Function (R01 HL081893). We will measure muscle strength, endurance and aerobic capacity because weakness is a frequent, but largely unquantified, complaint among patients with statin myalgia and its prevention with CoQ10 is therefore important. Also, some investigators have reported changes in the rest and exercise respiratory exchange ratio (RER) with statin therapy implying an alteration in cellular substrate metabolism with statins that may be influenced by CoQ10 treatment.

Study Subjects: Subjects will be recruited from the Cholesterol Management Center, which sees approximately 20 new patients weekly, the majority of whom have statin myalgia and who are referred because of Dr. Thompson's expertise in this topic, via advertisements and by physician contact by mail and email informing them of the study. Subjects will be reimbursed $500 for their participation in the study.

Study Definition of Statin-Related Myopathic Complaints: Statin myopathic symptoms have been poorly defined in the medical literature. For the purpose of this study, subjects will be considered to have had prior statin related complaints and recruited for participation in the study if all of the following occur:

1. They developed new myalgia, cramps, or muscle aching during statin treatment; 2. The symptoms resolved within 4 weeks of stopping the statin. Subjects meeting these criteria will be recruited into the study. To ensure that only patients with documented statin myalgia are entered into the CoQ10 trial, all subjects with a history of statin myalgia will be treated for up to 8 weeks with simvastatin 20 mg daily or placebo in a double-blind, cross-over protocol.

Those developing statin myalgia only during simvastatin treatment will be advanced to the CoQ10 trial.

Throughout the study, subjects will be contacted by phone weekly to inquire about muscle complaints using the Brief Pain Inventory (Short Form) (BPI-SF) (18). Results will be recorded on paper forms and entered into the database. During the phone contacts, subjects with symptoms for statin myopathy will have a CK level determined within 72 hours and while on study drug. If the CK is > 10 times upper limits of normal (UNL), the standard diagnosis of myositis, and is unassociated with recent exercise, the drug will be stopped and the subject will undergo prompt repeat testing and be removed from the study. If the CK is < 10 UNL, the drug will be continued until the subject has had symptoms for 1 week to document that the symptoms are not transitory. After 1 week of persistent symptoms or as soon as possible if the patient has intolerable symptoms, the subject will undergo final testing and have completed the study. This reduces undue subject burden such that subjects do not have to maintain statin treatment for multiple weeks with pain symptoms. Subjects who do not report recurrent symptoms will be treated for 8 weeks, at which time they will undergo final testing and have completed the study.

Justification of Primary Endpoint: We will examine the ability of CoQ10 to reduce the intensity of pain because many patients would remain on statin therapy if the discomfort were tolerable. Consequently, increasing pain tolerability is a key clinical measure. We selected 8 weeks of therapy for the simvastatin vs placebo and CoQ10 vs placebo sections of the study because in the largest clinical study, the median time to 135 Subjects with Prior Statin Complaints: Stop Cholesterol Drugs for at least 4 Weeks Run-In: Initial - Simvastatin 1. Phlebotomy: Lipids1, ALT, creatinine, TSH, CK, CKMB and CoQ10 2. Simvastatin 20 mg for 8 weeks or Until Symptoms Persist for 1 Week or are Intolerable 3. Obtain lipids and CK 100 Subjects Symptomatic on Statins Only:

1. Phlebotomy: Lipids1, ALT, creatinine, CK, CKMB and CoQ10

2. Baseline Strength and Exercise Performance Testing, Accelerometer, Pain Questionnaire

3. Randomization to Treatment: Placebo or 600 mg CoQ10

4. Load Subjects for 2 weeks on Treatment Simvastatin 20mg + Placebo (N=50) Simvastatin 20mg + CoQ10 (N=50) At 8 Weeks or Until Symptoms Persist 1 Week or are Intolerable:

1. Phlebotomy: Lipids, ALT, creatinine, CK, CKMB and CoQ10 2. Strength and Exercise Performance Testing, Accelerometer, Pain Questionnaire 4 week washout At 8 Weeks or Until Symptoms Persist 1 Week or are Intolerable:

1. Phlebotomy: Lipids, ALT, creatinine, CK, CKMB and CoQ10

2. Strength and Exercise Performance Testing, Accelerometer, Pain Questionnaire Run-In: Initial - Placebo

1. Phlebotomy: Lipids, ALT, creatinine, TSH, CK, CKMB and CoQ10 2. Placebo for 8 Weeks or Until Symptoms Persist for 1 Week or are Intolerable 3. Obtain lipids and CK Run-In: Placebo

1. Phlebotomy: Lipids, ALT, creatinine, CK, CKMB

2. Placebo for 8 weeks or Until Symptoms Persist for 1 Week or are Intolerable

3. Obtain lipids and CK Run-In: Simvastatin

1. Phlebotomy: Lipids, ALT, creatinine, CK, CKMB 2. Simvastatin 20 mg for 8 Weeks or Until Symptoms Persist for 1 Week or are Intolerable 3. Obtain lipids and CK 4 week washout Weekly phone calls: Pain Questionnaires Weekly phone calls: Pain Questionnaires Weekly phone calls: Pain Questionnaires used to assess muscle symptoms and document myalgia onset of myalgia in statin naïve subjects was 1 month (4) and statin rechallenge typically reproduces symptoms more rapidly(3). Consequently, most subjects with true statin myalgia will have clearly developed symptoms at or before 8 weeks, the point at which study procedures are completed, allowing us to accurately assess the impact of CoQ10 on muscle pain intensity. Except for chronic aspirin use, commonly recommended in patients at risk for heart disease, or in patients chronically using pain medications even off statin therapy, over the counter pain medication use for myalgic or myopathic symptoms will be prohibited during the study.

Study Design

Allocation: Randomized, Endpoint Classification: Efficacy Study, Intervention Model: Parallel Assignment, Masking: Double Blind (Subject, Caregiver, Investigator, Outcomes Assessor), Primary Purpose: Basic Science

Conditions

Statin Myopathy

Intervention

CoEnzyme Q10, Placebo

Location

Hartford Hospital
Hartford
Connecticut
United States
06102

Status

Recruiting

Source

Hartford Hospital

Results (where available)

View Results

Links

Medical and Biotech [MESH] Definitions

S-Acyl coenzyme A. Fatty acid coenzyme A derivatives that are involved in the biosynthesis and oxidation of fatty acids as well as in ceramide formation.

A coenzyme A derivative which plays a key role in the fatty acid synthesis in the cytoplasmic and microsomal systems.

Misunderstanding among individuals, frequently research subjects, of scientific methods such as randomization and placebo controls.

A ferredoxin-containing enzyme that catalyzes the COENZYME A-dependent oxidative decarboxylation of PYRUVATE to acetyl-COENZYME A and CARBON DIOXIDE.

Enzymes which transfer coenzyme A moieties from acyl- or acetyl-CoA to various carboxylic acceptors forming a thiol ester. Enzymes in this group are instrumental in ketone body metabolism and utilization of acetoacetate in mitochondria. EC 2.8.3.

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