G71.032
Autosomal recessive limb girdle muscular dystrophy due to calpain-3 dysfunction
Clinical Classification Guidelines
Inclusion Terms
- Limb girdle muscular dystrophy type 2A
- LGMD R1 calpain-3-related
- Primary calpainopathy
Medical Intelligence & Overview
Autosomal recessive limb girdle muscular dystrophy due to calpain-3 dysfunction, also called LGMD R1 or primary calpainopathy, is a rare inherited disorder that causes progressive muscle weakness and wasting primarily around the shoulders and hips. This condition is part of a group of muscular dystrophies that affect the voluntary muscles and is characterized by a gradual decline in muscle strength, which can impact mobility and quality of life over time.
Causes & Symptoms
Clinical Causes: Genetic mutation: The condition is caused by mutations in the CAPN3 gene, which provides instructions for making the enzyme calpain-3. Inheritance pattern: It follows an autosomal recessive inheritance pattern, meaning a person needs to inherit two copies of the mutated gene (one from each parent) to develop the disease. Family history: It is more common in families where multiple members are affected, although new mutations can also occur.
Key Symptoms: Muscle weakness primarily affecting the shoulder and pelvic girdles. Progressive muscle wasting over years. Difficulty climbing stairs, rising from a seated position, or lifting objects. Reduced muscle endurance and fatigue during physical activity. Possible calf hypertrophy (enlargement of calf muscles). Potential onset in adolescence or early adulthood, but symptoms can vary widely.
Diagnostic & Treatment
Diagnosis Path: Diagnosing autosomal recessive limb girdle muscular dystrophy involves a combination of clinical examination, family history assessment, and various tests including genetic analysis to identify mutations in the CAPN3 gene. Electromyography (EMG) and muscle biopsies may also be used to observe characteristic muscle changes, while blood tests can help rule out other causes of muscle weakness.
Treatment Protocols: Currently, there is no cure for LGMD R1 caused by calpain-3 dysfunction. Management focuses on alleviating symptoms, maintaining muscle strength and function, and preventing complications. Treatment strategies may include physical therapy, occupational therapy, and the use of assistive devices like braces or mobility aids. Regular monitoring by healthcare professionals is essential to address issues promptly, and research into potential therapies such as gene therapy is ongoing.
Clinical Advice & FAQs
Billing Guidance
Is G71.032 a billable ICD-10 code?
Yes, G71.032 is a specific, billable code that can be used to indicate a diagnosis for reimbursement purposes.
Documentation
How do I report G71.032?
Clinical documentation must specify the nature of Autosomal recessive limb girdle muscular dystrophy due to calpain-3 dysfunction and any associated comorbidities for accurate reporting.
Cite this Clinical Reference