Kearns-Sayre syndrome is a rare mitochondrial disorder that primarily affects young people before the age of 20, causing problems with the eyes, heart, muscles, and many other body systems. While there is currently no cure for this progressive condition, a combination of supportive treatments and careful monitoring can help manage symptoms and improve quality of life for those living with the disease.

How Treatment Helps People Living with Kearns-Sayre Syndrome

When someone is diagnosed with Kearns-Sayre syndrome, the main goal of treatment is not to cure the disease, but to manage its many symptoms and prevent life-threatening complications. Because this condition affects multiple organs and systems throughout the body, treatment needs to be tailored to each person’s specific needs and the particular organs that are affected.^[1]

The treatment approach for Kearns-Sayre syndrome depends heavily on which body systems are involved and how severely they are affected. Some people may have mild symptoms that require only regular monitoring, while others face more serious complications that need immediate medical intervention. The age at which symptoms appear and how quickly they progress also influences treatment decisions.^[4]

Medical professionals follow established guidelines that recommend regular check-ups with multiple specialists. This is because the disease can affect the heart, eyes, muscles, brain, endocrine system, and other organs. Early diagnosis and ongoing medical surveillance are crucial, as some complications—particularly those affecting the heart—can be life-threatening if not detected and treated promptly.^[3]

Unlike some diseases where a single medication or procedure can provide a cure, Kearns-Sayre syndrome requires a comprehensive, long-term management strategy. Researchers continue to explore new approaches to treating mitochondrial diseases, including experimental therapies being tested in clinical trials. While these investigational treatments offer hope for the future, current standard care focuses on symptom management and preventing complications.^[4]

Standard Medical Care for Kearns-Sayre Syndrome

There is currently no disease-modifying therapy available for Kearns-Sayre syndrome, which means there are no treatments that can directly fix the underlying mitochondrial dysfunction causing the disease. Instead, medical care is symptomatic and supportive, meaning doctors treat each symptom or complication as it arises and work to prevent new problems from developing.^[6]

The most critical aspect of standard care involves regular and long-term follow-up with cardiologists. Heart problems, particularly cardiac conduction defects (abnormalities in the electrical signals that control the heartbeat), are among the most dangerous complications of Kearns-Sayre syndrome. These heart rhythm problems can lead to heart block, where the electrical signals moving through the heart are delayed or blocked entirely. Studies have shown that heart block can cause death in approximately 20 percent of patients with this condition, making cardiac monitoring absolutely essential.^[4]

When heart conduction problems are detected, doctors may recommend implanting a pacemaker. This small electronic device is placed under the skin and connected to the heart with wires. It monitors the heart’s rhythm and delivers electrical pulses when needed to keep the heart beating at a normal rate. For some patients, especially those who experience fainting spells or irregular heartbeats, a pacemaker can be life-saving. Some medical experts also suggest that patients with significant heart rhythm abnormalities should be considered for implantable cardioverter defibrillators, which can detect and correct dangerous heart rhythms more aggressively than standard pacemakers.^[6][10]

Eye problems are another major area requiring ongoing treatment. The drooping eyelids, known as ptosis, can become severe enough to block vision. While there is typically no treatment available to improve the limitation in eye movement itself, surgical procedures can help with ptosis. Frontal suspension surgery is one option, where surgeons mechanically lift the eyelid. However, surgery must be performed carefully in specialized centers with expertise in ophthalmic procedures, as there is a risk of corneal damage from eye exposure after the procedure. Some patients may use supportive devices such as eyelid crutches as a non-surgical alternative.^[10][14]

The vision problems caused by damage to the retina cannot be directly treated, but regular eye examinations by ophthalmologists help monitor the progression of pigmentary retinopathy and other visual complications. These check-ups allow doctors to detect changes early and provide supportive care to help patients adapt to vision loss.^[4]

Hearing loss is almost universal in people with Kearns-Sayre syndrome who survive into their fourth decade of life. Bilateral sensorineural hearing loss (hearing loss affecting both ears caused by problems in the inner ear or hearing nerve) often requires hearing aids. Some patients may not achieve full correction even with hearing aids. In certain cases, cochlear implants—devices that bypass damaged parts of the ear and directly stimulate the hearing nerve—are being investigated as a treatment option.^[6][10]

Physical therapy plays an important supporting role in managing muscle weakness. Regular exercise, particularly activities that cause muscles to contract and shorten, may help maintain muscle strength and mobility. There is a scientific basis for this: exercise can stimulate the growth of satellite cells, which are muscle cell precursors involved in muscle regeneration. These satellite cells contain very low levels of the abnormal mitochondrial DNA that causes the disease. If they multiply, the proportion of normal DNA to abnormal DNA can increase, potentially providing some benefit. However, exercising to this extent can be difficult for patients who are severely affected or very young.^[10]

Many people with Kearns-Sayre syndrome develop endocrine disorders—problems with hormone-producing glands. These can include diabetes mellitus, growth hormone deficiency, thyroid problems, and other hormonal imbalances. Fortunately, most endocrine abnormalities can be treated with medications. Screening is recommended to detect these problems early, including tests to measure blood glucose, calcium, magnesium, plasma cortisol, and thyroid function.^[6]

Some patients develop swallowing difficulties due to cricopharyngeal achalasia (incomplete opening of the upper part of the food pipe). When swallowing problems become significant, surgical management may be needed. In some cases, doctors may recommend inserting a gastrostomy tube, which allows nutrition to be delivered directly into the stomach through the abdominal wall.^[10]

Nutritional supplementation is another component of standard care. Many doctors prescribe coenzyme Q10, a substance that plays a role in energy production within cells. The rationale is that this supplement might help improve mitochondrial function, although there is no definitive evidence that it changes the course of the disease. Some patients also receive supplementation with vitamins and other substances as part of a “mito cocktail”—a combination of supplements aimed at supporting cellular energy production. In one reported case, a child with incomplete Kearns-Sayre syndrome who also had cerebral folate deficiency showed clinical and radiological improvement after supplementation with folinic acid, a form of folate vitamin.^[10]

The duration of treatment for Kearns-Sayre syndrome is lifelong. Because this is a progressive disease that worsens over time, patients require continuous medical supervision and adjustment of their treatment plans as new symptoms emerge or existing symptoms change. Regular appointments with multiple specialists—including cardiologists, ophthalmologists, endocrinologists, neurologists, audiologists, and sometimes psychiatrists or neuropsychologists—are typically necessary throughout the patient’s life.^[4]

Innovative Approaches Being Tested in Clinical Trials

While standard treatments focus on managing symptoms, researchers are working to develop therapies that could potentially address the underlying mitochondrial dysfunction in Kearns-Sayre syndrome. The most promising research directions involve finding ways to alter the replication of abnormal mitochondria or destroy them, allowing healthy mitochondria to take their place.^[4]

Scientists are exploring strategies to encourage the replication of normal mitochondrial DNA while inhibiting the replication of the mutant DNA. This approach is based on the understanding that people with Kearns-Sayre syndrome have a mixture of normal and abnormal mitochondria in their cells. If researchers could shift the balance toward more normal mitochondria, it might improve cellular energy production and reduce symptoms.^[10]

The goal of current research is to increase understanding of mitochondrial disorders and to find ways to prevent, treat, and ultimately cure them. Organizations like the National Institute of Neurological Disorders and Stroke support research on neuromuscular disorders including Kearns-Sayre syndrome. This research aims to uncover the detailed mechanisms by which mitochondrial DNA deletions lead to specific symptoms, which could reveal new targets for therapy.^[4]

Scientists are particularly interested in understanding why certain tissues are more severely affected than others. For example, eyes and muscles are especially dependent on mitochondria for energy, which may explain why they are so commonly affected in Kearns-Sayre syndrome. Understanding these tissue-specific vulnerabilities could lead to more targeted treatment approaches.^[2]

Research is also ongoing to better understand the genetic causes of the syndrome and to develop potential treatments that might improve mitochondrial function and slow disease progression. Some patients may have opportunities to participate in clinical trials, which offer access to new and experimental therapies that are not yet widely available. These trials are conducted at specialized medical centers and typically have specific eligibility criteria regarding age, disease stage, and severity of symptoms.^[15]

Clinical trials for mitochondrial diseases typically progress through several phases. Phase I trials focus primarily on safety, testing new treatments in small groups of people to evaluate side effects and determine safe dosage ranges. Phase II trials expand to larger groups and begin to assess whether the treatment is effective at improving symptoms or slowing disease progression. Phase III trials involve even larger groups and compare the new treatment directly against standard care or placebo to confirm effectiveness and monitor for side effects in diverse populations.

While specific clinical trials for Kearns-Sayre syndrome may be limited due to the rarity of the condition, research into broader categories of mitochondrial diseases may offer relevant insights and potential treatment options. Patients interested in participating in research should discuss this with their medical team, who can help identify appropriate studies and determine eligibility.

Most common treatment methods

• Cardiac monitoring and pacemaker implantation
  • Regular electrocardiogram (ECG) testing to detect heart conduction problems
  • Implantation of pacemakers to prevent dangerous heart rhythms and heart block
  • Consideration of implantable cardioverter defibrillators for patients with severe arrhythmias
  • Long-term follow-up with cardiologists as the most essential specialist care
• Surgical interventions for eye problems
  • Frontal suspension surgery to mechanically lift drooping eyelids (ptosis)
  • Surgical shortening of levator muscles to elevate the eyelid
  • Use of supportive devices such as eyelid crutches as non-surgical alternatives
  • Procedures performed only in specialized centers with ophthalmic surgery expertise
• Hearing support
  • Hearing aids for bilateral sensorineural hearing loss
  • Investigation of cochlear implants for significant deafness
  • Regular audiology consultations to monitor hearing changes
• Physical therapy and exercise
  • Regular physical therapy to maintain muscle strength and mobility
  • Exercise programs designed to stimulate satellite cell proliferation
  • Therapeutic activities aimed at preventing muscle weakness progression
• Nutritional supplementation
  • Coenzyme Q10 supplementation to support mitochondrial function
  • “Mito cocktail” regimen consisting of vitamins and supplements
  • Folinic acid supplementation in cases with cerebral folate deficiency
  • Gastrostomy tube placement for patients with severe swallowing difficulties
• Endocrine disorder management
  • Medications to treat diabetes mellitus, thyroid problems, and other hormonal imbalances
  • Regular screening for endocrine abnormalities through blood tests
  • Consultations with endocrinologists for hormone replacement therapies
• Multidisciplinary supportive care
  • Regular ophthalmology examinations to monitor vision problems
  • Neurology and neuropsychiatry consultations for cognitive and neurological symptoms
  • Surgical management of swallowing difficulties when needed
  • Genetic counseling for patients and families