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. 2016 Jun 10;3(1):53-59.
doi: 10.14744/nci.2016.38233. eCollection 2016.

Comparison of mirtazapine, gabapentin and ondansetron to prevent intrathecal morphine-induced pruritus

Ayse Akhan  1 , Ferhunde Dilek Subasi  2 , Gulsen Bosna  2 , Osman Ekinci  2 , Hakan Pamuk  2 , Siddika Batan  2 , Rezzan Yagmur Ateser  2 , Gulden Turan  2
Affiliations

Comparison of mirtazapine, gabapentin and ondansetron to prevent intrathecal morphine-induced pruritus

Ayse Akhan et al. North Clin Istanb. .

Abstract

Objective: Antagonism of the central nervous system inhibitor neurotransmitter gamma-Aminobutyric acid (GABA) or serotonergic system activation is an important factor in the pathogenesis of intrathecal morphine-induced pruritus. This study tested the hypothesis that preoperative use of ondansetron, gabapentin or mirtazapine can prevent morphine-induced pruritus.

Methods: We randomly allocated 80 patients of American Society of Anesthesiology (ASA) classification I and II physical status who were to undergo unilateral inguinal hernia or pilonidal sinus operations under spinal anesthesia into 4 equal groups. The first 3 groups received oral doses of 30 mg mirtazapine, 8 mg ondansetron, and 1200 mg gabapentin at 2 hours, 10 minutes, and 1 hour before surgery, respectively, and the fourth group was given a placebo. All patients received intrathecal injection of 15 mg of 0.5% hyperbaric bupivacaine and 0.2 mg morphine. Pruritus was evaluated at 0, 3, 6, 9, 12, and 24 hours after intrathecal morphine administration, and details of presence, onset time, duration, localization, and severity of pruritus were recorded.

Results: Incidence of pruritus was significantly more frequent in the placebo group compared to ondansetron, gabapentin, and mirtazapine groups (70%, 55%, 35%, and 35%, respectively). In general, onset of pruritus was between 2 and 6 hours after intrathecal morphine injection; however, onset in the gabapentin group (mean±SD: 4.75±2.7 hours; p=0.019) was delayed compared to other groups. It was observed that pruritus persisted relatively longer in the ondansetron and placebo groups (mean±SD: 6±3.08; 5.82±2.96 hours, respectively; p=0.047). No statistical determination was made regarding location of pruritus. Severity of pruritus was greater in the placebo group (p=0.0001). Necessity for antipruritic treatment was not statistically significantly different between groups.

Conclusion: Incidence and severity of intrathecal morphine-induced pruritus decreased with use of each of all 3 drugs compared to placebo.

Keywords: Gabapentin; intrathecal; mirtazapine; morphine; ondansetron; pruritus.

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Conflict of interest statement

Conflicts of Interest: None declared.

Figures

FIGURE 1
FIGURE 1
Comparison of patient groups regarding onset time and duration of itching.
FIGURE 2
FIGURE 2
Comparison of the patient groups regarding treatment of itching.
See this image and copyright information in PMC

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