The effect of amitriptyline, gabapentin, and carbamazepine on morphine-induced hypercarbia in rabbits.

Abstract:

BACKGROUND:Severe exacerbation of chronic neuropathic pain often requires morphine in patients already treated with drugs such as tricyclic antidepressants, carbamazepine and gabapentin. However, it is unclear if a combination of these drugs intensifies the effects of morphine on the respiratory system and, if so, whether these effects are due to pharmacokinetic or pharmacodynamic interaction. METHODS:We gave rabbits (n=6 per group) the following drugs daily for 4 days: subcutaneous normal saline 1 mL (control); amitriptyline subcutaneously 7 mg/kg; carbamazepine orally 100 mg/kg; gabapentin subcutaneously 25 mg/kg; and all three drugs concurrently (combination). On the fifth day, morphine 5 mg/kg was given IV, and Paco2, Pao2 and pH were measured. Morphine, morphine 3-glucoronide and morphine 6-glucoronide concentrations were measured in the plasma over the 4 h period after morphine injection. RESULTS:Compared with controls, premorphine baseline Paco2 was significantly higher (P<0.05) in the amitriptyline group. Postmorphine Paco2 was significantly higher in the amitriptyline and combination groups at all time points over the 240 min, and in the gabapentin group at 10 and 30 min after morphine injection (P<0.05). Peak Paco2 was significantly higher in the amitriptyline group (58.4+/-1.6 mm Hg; mean SD, P<0.005) and in the combination group (57.4+/-1.0 mm Hg, P<0.02) than in the control group (50.2+/-5.2 mm Hg). Similarly, the area under the curve of Paco2 from zero to 240 min was significantly higher in the amitriptyline and combination groups than in the control (P<0.001). There were no significant differences among the groups in plasma concentrations of morphine and its metabolites. CONCLUSIONS:We conclude that pretreatment with amitriptyline increases morphine- induced hypercarbia through pharmacodynamic processes. The effects of carbamazepine or gabapentin were not obvious in this model.

journal_name

Anesth Analg

journal_title

Anesthesia and analgesia

authors

Kozer E,Levichek Z,Hoshino N,Kapur B,Leombruno J,Taguchi N,Garcia-Bournissen F,Koren G,Ito S

doi

10.1213/ane.0b013e31817e6e53

subject

Has Abstract

pub_date

2008-10-01 00:00:00

pages

1216-22

issue

4

eissn

0003-2999

issn

1526-7598

pii

107/4/1216

journal_volume

107

pub_type

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