Spinal Muscular Atrophy Type 0 C4324643
The most severe form of spinal muscular atrophy, presenting before birth or immediately after. Affected infants experience extreme muscle weakness and respiratory failure. This condition is typically fatal very early in life.
Key facts at a glance
- ICD-10
- G40.909
- ICD-11
- 8A00.0
- Body system
- neurologic
- Severity
- fatal
- Chronic
- true
Signs and symptoms
Common signs and symptoms that may indicate this condition.
Warning signs - seek immediate care
Generalized symptoms
Progressive symptoms that can become life-threatening without treatment.
Seek immediate medical attention if symptoms worsen.
Respiratory failure at birth
Generalized hypotonia
Poor spontaneous movement
(neurologic)Feeding difficulties
(neurologic)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
Neonatal intensive care support
Immediate intensive monitoring and life-sustaining support in a neonatal setting. Focus on stabilizing vital functions and assessing immediate needs.
Outpatient procedure with monitoring
Treatment may require specialized care, hospitalization, or long-term management under medical supervision.
Early disease-modifying therapy initiation
Prompt initiation of genetic therapies targeting the underlying SMN deficiency. Earlier treatment correlates with better outcomes in this severe form.
Additional treatment options
Respiratory support intervention
Mechanical ventilation support tailored to neonatal needs, ranging from non-invasive support to more invasive options based on individual assessment.
surgicalSpecialized neonatal nutrition
Nutritional support designed for neonatal metabolic needs, potentially including specialized formulas or feeding methods appropriate for the clinical situation.
dietaryIntensive family support services
Comprehensive psychological and social support for families facing this most severe SMA form. Includes counseling, care coordination, and connection to support resources.
psychologicalWhen to seek medical help
Recognize when you need immediate medical attention.
Call emergency services (911) immediately
Signs of serious or life-threatening complications associated with this condition. Immediate medical evaluation is required.
Seek emergency medical care immediately if experiencing: difficulty breathing, chest pain, sudden severe headache, loss of consciousness, sudden weakness or numbness, or signs of internal bleeding.
Frequently asked questions
Common questions about this topic.
What is Spinal Muscular Atrophy Type 0 C4324643?
Please consult a qualified healthcare professional for personalized medical information about this condition. [Content pending medical review.]
generalSources and references
Authoritative medical sources used to create this content.
Mercuri E, Finkel RS, Muntoni F, et al. Diagnosis and management of spinal muscular atrophy: part 1. Neuromuscul Disord. 2018.
Arnold WD, Kassar D, Kissel JT. Spinal muscular atrophy: diagnosis and management. Continuum. 2015.
Finkel RS, Mercuri E, Darras BT, et al. Nusinersen versus sham control in infantile-onset spinal muscular atrophy. N Engl J Med. 2017.
Chiriboga CA, Swoboda KJ, Darras BT, et al. Results from a phase 1 study of nusinersen in children with spinal muscular atrophy. Neurology. 2016.
Medication Comparisons
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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 20, 2026. · Read our editorial policy