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Microvascular decompression of the left lateral medulla oblongata for severe refractory neurogenic hypertension
E I Levy1, B Clyde, M R McLaughlin
1Department of Neurological Surgery, The University of Pittsburgh Medical Center, Pennsylvania 15213, USA.
Insights
Microvascular decompression of the left medulla oblongata effectively lowered blood pressure in severe hypertension patients. This surgical approach also improved autonomic dysreflexia in many individuals.
Area of Science:
- Neurosurgery
- Cardiovascular Medicine
- Neurology
Background:
- Severe essential hypertension (HTN) is often medically refractory.
- Autonomic dysreflexia can accompany severe HTN.
- Medullary compression may contribute to HTN and autonomic dysfunction.
Purpose of the Study:
- To evaluate microvascular decompression (MVD) of the left rostral ventrolateral medulla oblongata.
- To assess MVD safety and efficacy for severe, medically intractable hypertension.
- To determine MVD's impact on autonomic dysreflexia.
Main Methods:
- Twelve patients with refractory hypertension underwent MVD of the left rostral ventrolateral medulla oblongata.
- Pre-operative evaluations excluded secondary causes of hypertension.
- Surgical indications included specific blood pressure thresholds, lability, or MRI-confirmed medullary compression.
Main Results:
- Ten of 12 patients achieved a systolic blood pressure reduction >20 mm Hg.
- Seven of eight patients showed improvement in blood pressure lability and/or autonomic dysreflexia.
- Five patients experienced sustained improvements in these parameters.
Conclusions:
- Microvascular decompression of the left rostral ventrolateral medulla oblongata is a potential treatment for severe, refractory hypertension.
- MVD may also be effective for managing associated autonomic dysreflexia.
- Further research is warranted to confirm these findings.
Objective:
To demonstrate that microvascular decompression of the left medulla oblongata is a safe and effective modality for treating elevated blood pressure in patients with severe medically refractory "essential" hypertension (HTN).
Methods:
Twelve patients with medically intractable HTN with or without autonomic dysreflexia underwent microvascular decompression of the left rostral ventrolateral medulla oblongata. Causes such as pheochromocytoma, carcinoid syndrome, and renal disease were ruled out before surgery. Indications for surgery included systolic blood pressures greater than 180 mm Hg refractory to three or more medications, severe blood pressure lability, or medically resistant HTN at systolic pressures greater than 160 mm Hg associated with autonomic dysreflexia and/or magnetic resonance images demonstrating left medullary compression. The median age and follow-up duration were 51 years and 4.1 years, respectively.
Results:
Ten of 12 patients experienced reductions in systolic blood pressure greater than 20 mm Hg. Of these 10 patients, pressure reductions were temporary (6 mo) in two. Seven of eight patients experienced improvement in blood pressure lability and/or autonomic dysreflexia, with five patients showing sustained improvements.
Conclusion:
Microvascular decompression of the left rostral ventrolateral medulla oblongata may be an effective treatment modality for patients suffering from severe HTN and/or autonomic dysreflexia refractory to medical management.