PMID: 11907169Mar 22, 2002Paper

Cardiovascular responses elicited by the "binge" administration of methamphetamine

The Journal of Pharmacology and Experimental Therapeutics
Kurt J VarnerSuzanne Meleg-Smith

Abstract

Methamphetamine (METH) abuse is often characterized by a repeated pattern of frequent drug administrations (binge) followed by a period of abstinence. The effect of this pattern of METH use on cardiovascular function has not been characterized. Radiotelemetry was used to record the cardiovascular responses elicited during three successive METH binges (3 mg/kg, b.i.d. for 4 days) in conscious rats. Each binge was followed by a 10-day METH-free period. The effects of METH administration on vascular reactivity, Bezold-Jarisch reflex function, and cardiac morphology were also evaluated. The pressor responses elicited by the first three doses of METH in the second and third binges were significantly larger than those elicited by the corresponding doses in the first binge. The heart rate (HR) responses elicited by METH were similar within and among the three binges. Ten days after the last binge, the depressor responses elicited by the i.v. injection of sodium nitroprusside, isoproterenol, and acetylcholine were significantly smaller than those elicited before each binge. The arterial pressure and HR responses elicited by phenylephrine were unchanged. Bezold-Jarisch reflex function evoked by i.v. serotonin (10 microg/kg) was signific...Continue Reading

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Citations

Mar 7, 2012·Archives of Toxicology·Márcia CarvalhoMaria de Lourdes Bastos
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