Mitochondrial Complex I Deficiency C1838979
A genetic condition that impairs the mitochondria's ability to convert food into energy. It can affect various organs, especially those with high energy demands. Care is supportive and may involve multiple specialists.
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
Seizures
Developmental delay
(neurological)Fatigue or weight changes
(metabolic)Significant symptoms that substantially affect daily functioning.
Frequency: Common at all stages
Lactic acidosis
(metabolic)Encephalopathy
(neurological)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
Complex I Supportive Therapy
Mitochondrial cocktail including CoQ10, NADH, L-carnitine, and B vitamins to support complex I function and reduce oxidative stress burden.
Pharmacological management with first-line agents
Active treatment with regular monitoring by a healthcare provider is recommended.
Leigh Syndrome Surveillance Protocol
If neurological involvement present, regular neuroimaging, developmental assessments, and metabolic monitoring to detect and manage complications early.
Additional treatment options
Thiamine-Enriched Diet
Increased thiamine (vitamin B1) intake may support pyruvate dehydrogenase function and reduce lactic acidosis in some complex I deficiency patients.
dietaryRespiratory Muscle Training
Specific exercises to maintain respiratory function in patients with diaphragmatic weakness or recurrent respiratory infections.
physical_therapyTracheostomy and Ventilatory Support
For patients with severe respiratory insufficiency, surgical airway creation and mechanical ventilation support may be necessary.
surgicalWhen 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 C1838979?
Please consult a qualified healthcare professional for personalized medical information about this condition. [Content pending medical review.]
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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