Obstructive Jaundice Caused by Clonorchiasis-associated Duodenal Papillitis: A Case Report

We describe an unusual presentation of Clonorchis sinensis infection with obstructive jaundice due to duodenal papillitis which was relieved dramatically by endoscopic sphincterotomy. A 26-yr-old male presented with complaints of fatigue, weight loss and painless jaundice. The history was significant for frequent ingestion of raw freshwater fish. The patient underwent endoscopic retrograde cholangiopancreatography for evaluation of obstructive jaundice. The duodenal papilla was markedly edematous with a bulging configuration and hyperemic changes at the orifice. Cholangiography revealed mild bile duct dilatation and irregular wall changes with multiple indentations. However, there were no biliary stricture or stones noted as the cause of obstructive jaundice. We performed an endoscopic sphincterotomy for effective bile drainage through the duodenal papilla. After the sphincterotomy, the patient's jaundice was dramatically improved. Pathology of the duodenal papilla showed eosinophilic infiltration of the mucosa. Parasitic eggs, consistent with the diagnosis of C. sinensis, were found in the bile sample.

Therapeutic evaluation of sustained-releasing praziquantel (SRP) for clonorchiasis: Phase 1 and 2 clinical studies

Sustained-releasing praziquantel (SRP) tablet was designed for single dose treatment regimen of clonorchiasis. A previous pre-clinical study confirmed its sustained-releasing characteristics and a better cure rate than conventional praziquantel (PZQ). In this clinical study, the pharmacokinetics of this SRP tablet were investigated in human volunteers (phase 1; 12 volunteers), and its curative efficacy was examined in clonorchiasis patients (phase 2; 20 volunteers). In the phase 1 clinical study, blood concentrations of both tablets showed wide individual variation. The AUC(last) of SRP was 497.9+/-519.0 ng.hr/ml (mean+/-SD) and PZQ of 628.6+/-695.5 ng.hr/ml, and the AUC(inf) of SRP was 776.0+/-538.5 ng.hr/ml and of PZQ 658.6+/-709.9 ng.hr/ml. C(max) values of SRP and PZQ were 90.7+/-82.2 ng/ml and 214.9+/-251.9 ng/ml, and T(max) values were 3.42+/-1.43 hr and 1.96+/-1.23 hr, respectively. SRP tablets showed similar AUC values, but lower C(max) and longer T(max) values than PZQ. In the phase 2 study, SRP at 30 mg/kg (single dose) achieved a 60% cure rate and a 95.5% egg reduction rate. The cure rate of a single dose SRP was unsatisfactory compared with that of the conventional PZQ dose, but much better than that achieved by a single dose PZQ.

Infecçäo por Clonorchis sinensis em imigrantes asiáticos no Brasil: tratamento com praziquantel / Clonorchis sinensis infections in Asian immigrants in Brazil: treatment with praziquantel

Estudaram-se quinze pacientes com infecçäo assintomática por Clonorchis sinensis, revelada através de exame parasitológico de fezes. Todos eram de origem asiática e procuraram o Laboratório Central do Instituto Adolfo Lutz para se submeterem a exames laboratoriais necessários a regularizaçäo de sua situaçäo, face a nova legislaçäo sobre imigrantes. Eram todos indivíduos adultos, seis pertencendo ao sexo feminino e nove ao masculino. Os quinze pacientes comn clonorquíase foram internados no Hospital das Clínicas da FMUSP e tratados com Praziquantel, na dosagem de 60 mg/Kg de peso corporal, dividida em duas tomadas. Foram realizados exames coprológicos quantitativos (método de Kato-Katz), antes do tratamento específico e no 15§, 30§ e 60§ dias após a terapêutica. Na última avaliaçäo (60§ dias após terapêutica), em nove pacientes (60,0%) näo se encontraram ovos do treamatódeo nas fezes e nos seis (40,0%), que continuavam eliminando ovos, notou-se reduçäo na quantidade eliminada (superior a 90% em cinco e a 30% no paciente restante). Os pacientes foram também submetidos a exames subsidiários, para avaliaçäo do estado geral e funçäo hepática, antes da administraçäo de Praziquantel e, posteriormente, no seguimento ambulatorial. A medicaçäo foi relativamente bem tolerada pelos pacientes, verificando-se a ocorrência de efeitos colaterais representados por náuseas e vômitos (dois casos), vertigens e tonturas (dois casos), epigastralgia (dois casos) e diarréia no 3§ dia após tratamento (um caso)