Can gabapentin increase blood pressure
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Gabapentin and Blood Pressure: A Comprehensive Review
Introduction to Gabapentin and Blood Pressure
Gabapentin, a medication commonly used for neuropathic pain and seizures, has been studied for its effects on blood pressure (BP). This article synthesizes research findings to determine whether gabapentin can increase blood pressure.
Gabapentin's Effect on Blood Pressure in Animal Studies
Studies in Hypertensive Rats
Research on spontaneously hypertensive rats (SHR) has shown that gabapentin can lower blood pressure. Acute administration of gabapentin significantly reduced BP and heart rate (HR) in SHRs, more so than in normotensive Wistar-Kyoto rats. This effect was linked to a reduction in sympathetic nerve activity, as evidenced by decreased plasma norepinephrine levels and reduced pressor response to nerve stimulation Behuliak2016Behuliak2016Behuliak2018. Additionally, gabapentin's hypotensive effect was absent in sympathectomized rats, indicating that its action is mediated through the sympathetic nervous system Behuliak2016Behuliak2016Behuliak2018.
Hemodynamic Effects in Rats
In another study, gabapentin administered intracerebroventricularly increased systolic and diastolic BP, although the changes were not statistically significant . This suggests that while gabapentin can influence BP, the route of administration and the specific physiological context are critical factors.
Gabapentin's Effect on Blood Pressure in Clinical Settings
Effects During Surgical Procedures
Several studies have investigated gabapentin's impact on BP during surgical procedures, particularly during laryngoscopy and tracheal intubation, which are known to cause significant increases in BP and HR. Gabapentin, when administered before surgery, has been shown to attenuate these pressor responses. For instance, patients receiving 800 mg of gabapentin had significantly lower arterial pressure and HR increases compared to those receiving a placebo Memiş2006Fassoulaki2006Shrestha2012+1 MORE. This effect was also observed with a combination of gabapentin and other medications like esmolol, which further enhanced the attenuation of the pressor response Shrestha2012Yaqoob2017.
Gabapentin's Mechanism of Action on Blood Pressure
Central Nervous System Involvement
Gabapentin's ability to modulate BP appears to involve central mechanisms. In hypertensive rats, microinjection of gabapentin into the nucleus tractus solitarii (NTS), a key brain region for cardiovascular control, resulted in dose-related decreases in BP and HR. This effect was mediated through the nitric oxide synthase (NOS) signaling pathway, as it was attenuated by the NOS inhibitor L-NAME .
Conclusion
The current body of research indicates that gabapentin does not increase blood pressure. Instead, it generally lowers BP, particularly in hypertensive conditions, by modulating sympathetic nervous system activity and central cardiovascular control mechanisms. These effects are context-dependent, varying with the route of administration and the physiological state of the subject. Gabapentin's ability to attenuate pressor responses during surgical procedures further supports its role in managing BP.
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