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Type I Chiari deformity presenting with profound sinus bradycardia: case report and literature review
F Selmi1, K G Davies, R D Weeks
1Department of Neurosurgery, University Hospital of Wales, Cardiff, UK.
Insights
Type I Chiari deformity can cause unusual symptoms like severe bradycardia due to brainstem compression. Surgical decompression successfully treated this rare neurological complication.
Area of Science:
- Neurology
- Neurosurgery
- Cardiology
Background:
- Type I Chiari deformity involves cerebellar tonsil herniation through the foramen magnum.
- Symptoms typically arise from compression of the brainstem and spinal cord.
- Medullary compression causing bradycardia is an uncommonly reported association.
Observation:
- A patient presented with recurrent episodes of profound sinus bradycardia.
- A pacemaker was implanted to manage the bradycardia.
- Cerebellar ectopia (Chiari I deformity) was diagnosed after initial cardiac evaluation.
Findings:
- The patient's bradycardia was directly attributed to medullary compression from Type I Chiari deformity.
- Surgical decompression of the foramen magnum resolved the bradycardia episodes.
- This case highlights a previously underreported neurological cause of significant bradycardia.
Implications:
- Recognizing Chiari I deformity as a potential cause of bradycardia is crucial for accurate diagnosis.
- Neurosurgical intervention can effectively treat bradycardia secondary to Chiari malformation.
- This finding expands the spectrum of symptoms associated with Chiari I deformity.
Abstract:
Type I Chiari deformity presents with diverse symptoms and signs which can be attributed to compression of structures at the foramen magnum. Bradycardia as a result of medullary compression has not been reported previously. A patient is described with type I Chiari deformity who presented with episodic profound sinus bradycardia for which a pacemaker was inserted before the diagnosis of cerebellar ectopia was finally made. Surgical decompression proved curative.