Use of intravenous midazolam and clonidine in cyclical vomiting syndrome: a case report.

We report a case of a teenage boy with cyclical vomiting syndrome (CVS) who was referred to the anesthesia-run postoperative pain service for symptom management. His symptoms were uncontrolled by oral pizotifen prophylaxis and acute therapy with intravenous (IV) hydration and ondansetron. A continuous low dose IV midazolam infusion was added to his treatment regimen (as is instituted for recalcitrant postoperative nausea and vomiting) with benefit, but not total symptom resolution. Recent literature review suggested links between migraine, CVS and adrenergic autonomic dysfunction. Consequently, IV clonidine was administered, in addition, with recovery. This combination was reinstituted successfully on subsequent admissions and emergency department presentations with shortened episode durations from 4-5 days to 16-48 h. It is uncertain if clonidine's sympatholytic effects were significantly beneficial or if associated sedation or natural resolution were contributors. Many agents have been used in CVS therapy but no trials have been done. Neither midazolam nor clonidine has been reported previously as used in the treatment of CVS. The apparent success of this combination raises possibilities both for future trials and research into the pathogenesis of CVS.