Vascular Compression of Lateral Medulla Causing Paroxysmal Hypertension

Overview

This report describes a 78-year-old patient with paroxysmal hypertension and glossopharyngeal neuralgia linked to neurovascular compression of the rostral ventrolateral medulla (RVLM) by the posterior inferior cerebellar artery (PICA). Microvascular decompression (MVD) surgery successfully reduced the frequency and severity of hypertensive episodes, highlighting a potential treatment for refractory neurogenic hypertension.

Background

The rostral ventrolateral medulla (RVLM) plays a critical role in regulating sympathetic nervous system activity and cardiovascular reflexes. Neurovascular compression at the root entry zone of cranial nerves IX and X can disrupt this regulation, potentially causing refractory hypertension characterized by episodic blood pressure surges. Paroxysmal hypertension presents with abrupt symptomatic blood pressure elevations often accompanied by neurological symptoms but without emotional triggers. Microvascular decompression (MVD) has been proposed as a treatment option for patients with neurogenic hypertension unresponsive to multiple antihypertensive drugs.

Data Highlights

Key Findings

• Neurovascular compression of the left PICA on the RVLM and CN IX-X root entry zone was identified by MRI in a patient with paroxysmal hypertension.
• Episodes were characterized by abrupt, severe hypertension (>200 mm Hg systolic) with associated neurological and autonomic symptoms.
• Extensive multidisciplinary workup excluded other causes including pheochromocytoma and panic disorder.
• Microvascular decompression surgery relieved vascular compression, resulting in reduced frequency and severity of hypertensive crises.
• Postoperative transient cranial nerve X palsy occurred but resolved within one month.
• Patient reported improved quality of life and satisfaction with treatment at 6-month follow-up.

Clinical Implications

In patients with refractory paroxysmal hypertension and neurovascular compression of the RVLM, microvascular decompression may offer a viable treatment option to reduce hypertensive episodes and associated symptoms. Careful patient selection and thorough diagnostic evaluation are essential to exclude other etiologies. Surgical risks, including transient cranial nerve deficits, should be discussed with patients prior to intervention.

Conclusion

This case supports the role of neurovascular compression of the lateral medulla in paroxysmal hypertension and demonstrates that microvascular decompression can effectively reduce hypertensive crises in selected patients. Further studies are needed to better define patient selection criteria and long-term outcomes.

References

1. Jannetta 1979 -- Neurovascular compression and essential hypertension
2. Additional sources cited in article (e.g., refs 10, 11, 14, 19, 21, 22)