Mitochondrial Complex I Deficiency Nuclear Type Cn263238
A genetic condition where the mitochondria cannot efficiently produce cellular energy. This can lead to issues with muscles, brain function, and heart. Care involves multidisciplinary support and symptom management.
Key facts at a glance
- ICD-10
- E88.9
- ICD-11
- 5A00.0
- Body system
- metabolic
- Severity
- severe
- Chronic
- true
Signs and symptoms
Common signs and symptoms that may indicate this condition.
Warning signs - seek immediate care
Severe headache
Fatigue or weight changes
(metabolic)Significant symptoms that substantially affect daily functioning.
Frequency: Common at all stages
Elevated lactate/pyruvate ratio
(metabolic)Myopathy
(musculoskeletal)Optic atrophy
(ophthalmic)Diagnosis and tests
How this condition is diagnosed and what test results mean.
Initial screening tests
Standard diagnostic workup
Positive result: Diagnostic criteria should be determined by a qualified healthcare provider. [Content pending medical review.]
Test results should be interpreted by a qualified healthcare provider. [Content pending medical review.]
Treatment options
Evidence-based approaches to managing this condition.
First-line treatments
CoQ10 and Idebenone Combination Therapy
Idebenone, a synthetic analog of CoQ10, can bypass defective complex I and transfer electrons directly to coenzyme Q. This combination therapy targets the underlying electron transport defect in nuclear-type complex I deficiency.
Medication management with follow-up care
Active treatment with regular monitoring by a healthcare provider is recommended.
Additional treatment options
Ketogenic Diet Evaluation
A metabolic specialist evaluation for ketogenic diet potential may be beneficial, as this high-fat, low-carbohydrate diet can provide alternative energy substrates and reduce reliance on complex I-mediated ATP production.
dietaryOphthalmologic Surveillance
Regular eye examinations detect optic atrophy and retinal changes that can occur with nuclear-type mitochondrial complex I deficiency. Early detection allows for timely intervention and support services.
monitoringDevelopmental Support Therapy
Age-appropriate physical and occupational therapy supports motor development and independence. Therapy focuses on maintaining function, preventing contractures, and maximizing quality of life.
physical_therapyEnvironmental Modifications
Adapting living and learning environments to conserve energy and maximize function includes wheelchair accessibility, adaptive equipment, and home modifications. Supports independence while preventing fatigue.
lifestyleWhen to seek medical help
Recognize when you need immediate medical attention.
See a doctor within 24 hours
Moderate to severe symptoms that may indicate worsening of this condition. Prompt medical evaluation is recommended.
Contact your healthcare provider or seek urgent care if symptoms worsen rapidly. Go to the emergency department for life-threatening symptoms.
Frequently asked questions
Common questions about this topic.
What is Mitochondrial Complex I Deficiency Nuclear Type Cn263238?
Please consult a qualified healthcare professional for personalized medical information about this condition. [Content pending medical review.]
generalMedication Comparisons
Compare medications used to treat Mitochondrial Complex I Deficiency Nuclear Type Cn263238. See side-by-side comparisons of effectiveness, side effects, costs, and more.
View Medication ComparisonsThis information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.
This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.
If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.
Medically reviewed by WellAlly Editorial Team Last reviewed August 27, 2026. · Read our editorial policy