Due to the overlapping distribution of

Two consecutive cases are presented of patients with ICDs in whom the use of commercial units for muscle stimulation for abdominal training caused interference with the device, mimicked cardiac signals, and resulted in inappropriate treatment shock delivery.

SUMMARY Infection of

Foram estudadas as diferenças de interação (diferenciação e m ultiplicação) das cepas Y e CL de Os autores concluem pela possibilidade da presença de fatores de resistência à infecção e tam bém de inibidores de diferenciação como responsáveis p o r um a boa ou má interação parasito-vetor.Palavras chaves: Interação. T. cruzi-vetor. Xenodiagnóstico. F ator de resistência à infecção. Diferenciação.Diferentes autores têm se preocupado em de term inar o vetor ideal para o T. cruzi e sua aplicação em xenodiagnóstico da doença de Chagas. A crença de que as espécies locais d t triatomíneos são melhores adaptadas às cepas do T. cruzi também locais, foi motivo para elaboração de trabalhos onde se procurou esta confirmação (Dias^, U rdaneta-M orales e Rueda*^). Recentem entePerlowagora-Szumlewicz e co ls' ^ dem onstraram uma variação da suscetibilidade à infecção por diferentes espécies de triatomíneos frente à cepa Y do T. cruzi.

In patients serologically positive for Trypanosoma cruzi infection the three bug species/instar combinations used in xenodiagnosis showed third-instar Dipetalogaster maximus to be more efficient in detecting circulating trypanosomes than the first instar of the same species which, in turn, is more sensitive than third-instar Triatoma infestans. The sensitivity of the pool technique of faecal examination compared with individual dissection was investigated. Four pool examinations (the product of 20 bugs) were equivalent to 10 individual bug dissections. Because of the ease of providing large numbers of bugs for mass xenodiagnosis, first-instar D. maximus has replaced third-instar T. infestans in our routine work. The value of third-instar D. maximus as a xenodiagnostic agent needs further investigation.

Xenodiagnosis sensibility and its relation to Chagas' disease chronic phase parasitemia was verified in 104 patients. The nymphs of the triatomine species, simultaneously utilized in the xenodiagnosis of these patients, divided into two groups, were examined in different ways. The positivity rates achieved in the two groups (40.0% and 42.4%) and the individual positivity rates suggest a reavaliation in what is called "quantification of the chronic chagasic patient parasitemia", considering the methodology used in the xenodiagnosis examinations.

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