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Analysis of catecholamine and vasoactive peptide release in intracranial arterial venous malformations
E L Bloomfield1, D T Porembka, Z Y Ebrahim
1Department of General Anesthesiology, Cleveland Clinic Foundation, OH 44195, USA.
Insights
Postoperative hypertension after cerebral arteriovenous malformation resection is linked to elevated renin and norepinephrine. Blocking these hormones may help manage blood pressure and reduce complications.
Area of Science:
- Neurosurgery
- Cardiovascular Physiology
- Endocrinology
Background:
- Craniotomy for cerebral arteriovenous malformation (AVM) resection frequently causes postoperative hypertension.
- Uncontrolled hypertension post-AVM surgery increases risks of cerebral hemorrhage, morbidity, and mortality.
- Effective blood pressure management is critical for patient outcomes.
Purpose of the Study:
- To investigate the release of vasoactive peptides and catecholamines in patients undergoing AVM resection.
- To identify hormonal factors contributing to postoperative hypertension after cerebral AVM surgery.
- To compare hormonal profiles between AVM resection and cerebral aneurysm clipping patients.
Main Methods:
- Measurement of plasma renin activity, angiotensin I and II, vasopressin, aldosterone, epinephrine, and norepinephrine.
- Intraoperative and 36-hour postoperative blood sampling in 13 AVM resection patients and 6 control aneurysm clipping patients.
- Statistical analysis using analysis of variance to assess sample and group effects.
Main Results:
- Significant interaction between sample and groups for norepinephrine (p < 0.001) and renin (p = 0.002).
- Elevated plasma renin and norepinephrine levels observed in patients post-AVM resection.
- These hormonal elevations are implicated as a partial cause of postoperative hypertension.
Conclusions:
- Elevated plasma renin and norepinephrine contribute to postoperative hypertension in cerebral AVM resection patients.
- Targeting the release of renin and norepinephrine may offer a strategy for blood pressure control.
- Further research into hormonal blockade could improve surgical outcomes for AVM patients.
Abstract:
Craniotomy for resection of cerebral arterial venous malformation has been associated with postoperative hypertension, which necessitates administration of large doses of antihypertensive medications to control blood pressure. Controlling blood pressure is essential because hypertensive episodes can lead to postoperative cerebral hemorrhage with increases in morbidity and mortality. We measured vasoactive peptide and catecholamine release in 13 patients who underwent resection of an arterial venous malformation and in a control group of 6 patients who presented for clipping of unruptured cerebral aneurysms. Plasma renin activity, angiotensin I and II, vasopressin, aldosterone, epinephrine, and norepinephrine levels were measured intraoperatively and for 36 h postoperatively. Analysis of variance was used to assess sample and group effects. A significant interaction between sample and groups was found for norepinephrine (p < 0.001) and renin (p = 0.002). Our data suggest that elevated plasma renin and norepinephrine levels are in part responsible for postoperative hypertension in patients undergoing resection of arterial venous malformations. Blocking the release of these hormones may help control blood pressure after surgery for removal of arterial venous malformations.