Therapeutic trial of praziquantal (Embay 8440; Biltricide®) on the dermal and cerebral human cysticercosis

Abstract

A total of 28 adult cases who were confirmed cysticercosis with or without cerebral involvements were treated with praziquantel at the daily dose of 3 x 25 mg/kg for 3 to 7 consecutive days and was evaluated for tolerance and therapeutic effects in the trials clinically performed.The assessment of drug efficacy of praziquantel in the dermal cysticercosis was made by comparing the numbers of cysticercus nodules and histopathological findings of the biopsied parasites by means of light, scanning and transmission electron microscope. In the cerebral cysticercosis, the assessment was considered by the frequency of the episodes of convulsive seizure before and after treatment with praziquantel and by the findings of the disapearance or decreased densities of the lesions in C.T. scan in comparison with those of before and after treatment. The results were as follows: 1. The cysticerci in the subcutaneous tissues began to disappear within one month of drug administration of 3 x 25 mg/kg praziquantel over 3 to 7 days. Within 3 to 6 months most of the cysticerci had disappeared, although in some case a small number of cysticercus nodules remained even one year after treatment. 2. Histological observation of the cysticerci biopsied at different times during the course of treatment revealed that morphological changes were already taking place within two weeks after the treatment. At the early stage of the treatment, small vacuoles were scattered along the basement layer in the tegumental syncytium of the scolex and neck regions. In the scanning electron microscopic observation, marked surface changes were present in the neck region with many bleb-like structures formed by the bursting of the large vacuoles in the tegumental syncytium. In the specimens biopsied at 2 or 5 weeks after treatment, the degenerations and necrosis of the tegumental syncytium were seen in all parts of cysticercus. 3. In 12 cases of cerebral cysticercosis treated with praziquantel at the daily dose of 3 x 35 mg/kg for 3 or 4 consecutive days, there were no ceasing of the convulsive seizures during the 6 months follow-up. Among them 9 cases were given again the same doses of the drug for 4 or 7 days. In 7 of 9 cases, no more convulsive seizure was experienced over one or two years after the second time. At the same treatment the lesions of the brain C.T. scan disappeared, decreasd in size or calcified after treatment. In other 3 cerebral cysticercosis cases, complete cure was also obtained after the oral medication of praziquantel at the daily dose of 3 x 25 mg/kg for 7 consecutive days. 4. In the treatment of cerebral cysticercosis with praziquantel, it was found that the concomitant oral medication of dexamethasone during the course of treatment was effective for preventing and minimizing the side-effects.

Analysis of Parasitic Diseases Diagnosed by Tissue Biopsy Specimens at KyungHee Medical Center (1984-2005) in Seoul, Korea

“…However, in our study, infection rates of cysticercosis were higher in men than in women. Our study agrees to a previous research that showed a higher allotment rate of cysticercosis in men [11].…”

A Case of Extensive Spinal Cysticercosis Involving the Whole Spinal Canal in a Patient with a History of Cerebral Cysticercosis

“…Although a recent randomized controlled trial demonstrated the benefit of antihelminthic therapy in patients harboring viable cysts within the brain parenchyma, it is thought to increase inflammation because of cyst involution, leading to worsening clinical states, which might accelerate dissemination of other viable cysticerci 9,10. The long term prognosis of neurocysticercosis is still not satisfactory 3,6,10. Our patient had a long history of intracranial NCC with hydrocephalus and meningitis.…”

“…At that time, brain magnetic resonance imaging (MRI) revealed mild hydrocephalus and focal meningitis in the left cerebello-pontine and ambient cistern. A enzyme-linked immunosorbent assay of hos cerebrospinal fluid test confirmed cysticercosis,4,5 and the patient completed 2 cycles of oral praziquantel (PZQ; 50 mg/kg per day in 3 divided doses for 14 days)6 and carbamazepine (CMZ; 400 mg per day in 2 divided doses daily) for seizure prophylaxis. He was well until severe headache recurred 10 years later.…”

Advances in Serological Diagnosis of Taenia solium Neurocysticercosis in Korea

“…The concomitant application of serological diagnoses [20,21] provided further evidence for the presence of the worm in the brain. Safe and effective chemotherapeutics for the medical treatment of NC were successfully launched [22,23]. Several molecular and cell biological studies have elucidated bioactive molecules of TsM that are crucially involved in the regulation of homeostatic functions [24,25] and the symbiotic protein interactome network of the worm [26].…”