Does gabapentin increase blood pressure
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The Impact of Gabapentin on Blood Pressure: A Comprehensive Review
Introduction to Gabapentin and Blood Pressure
Gabapentin, a medication primarily used to treat neuropathic pain and seizures, has been studied for its effects on blood pressure (BP). This article synthesizes findings from various studies to determine whether gabapentin increases blood pressure.
Gabapentin and Blood Pressure in Animal Studies
Effects in Hypertensive Rats
Research on spontaneously hypertensive rats (SHR) has shown that gabapentin can lower blood pressure. Acute administration of gabapentin significantly reduced BP in SHR, more so than in normotensive Wistar-Kyoto rats, especially under stress conditions Behuliak2016Behuliak2016Behuliak2018. This hypotensive effect was linked to a reduction in sympathetic nervous system activity, as evidenced by decreased plasma norepinephrine levels and reduced pressor responses Behuliak2016Behuliak2016Behuliak2018.
Hemodynamic Responses in Rats
In another study, gabapentin administered intrathecally or intraperitoneally did not significantly alter hemodynamic parameters over 60 minutes. However, intracerebroventricular administration of gabapentin did increase systolic and diastolic BP, although the changes were not statistically significant .
Gabapentin and 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 transient increases in BP and heart rate (HR).
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Gabapentin and Tracheal Intubation: Gabapentin, when administered before surgery, has been shown to attenuate the pressor response to laryngoscopy and tracheal intubation. Patients receiving 800 mg of gabapentin had significantly lower arterial pressure and HR increases compared to those receiving a placebo Memiş2006Fassoulaki2006. Another study found that a combination of gabapentin and esmolol was more effective in attenuating both the pressor and tachycardic responses than either drug alone .
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Comparative Studies: In a comparative study, gabapentin alone and in combination with labetalol effectively attenuated the hemodynamic response to laryngoscopy and intubation. Gabapentin alone was particularly effective in reducing BP, while the combination with labetalol better controlled HR .
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Septorhinoplasty Patients: A study on patients undergoing septorhinoplasty found that premedication with 900 mg of gabapentin did not significantly affect hemodynamic changes induced by laryngoscopy, although there was a non-significant trend towards reduced bleeding .
Gabapentin and Blood Pressure in Cats
A study on cats found no significant differences in systolic arterial BP between gabapentin and placebo treatments, both in at-home and in-clinic environments. However, situational increases in BP were observed in both groups, indicating that gabapentin did not exacerbate these increases .
Conclusion
The evidence suggests that gabapentin does not increase blood pressure. In fact, it may lower BP in hypertensive conditions and attenuate BP increases during stressful procedures like laryngoscopy and tracheal intubation. These effects are likely due to gabapentin's influence on the sympathetic nervous system. However, the variability in responses and the potential for situational increases in BP warrant further investigation to fully understand gabapentin's cardiovascular effects.
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