Key result
kDNA-PCR detects Chagas reactivation up to ~85 days before clinical manifestations.
Why the study?
Chagas reactivation after heart transplantation is a major complication with poor diagnostic sensitivity using parasitological methods, necessitating evaluation of PCR for early diagnosis and treatment monitoring.
Does PCR testing improve the early diagnosis of Chagas reactivation and treatment monitoring in heart transplant patients with Chagas cardiomyopathy?
Observational (n=10)
Does PCR testing improve the early diagnosis of Chagas reactivation and treatment monitoring in heart transplant patients with Chagas cardiomyopathy?
PCR testing, particularly kDNA-PCR, is a highly sensitive and valuable tool for the early diagnosis of Chagas disease reactivation and for monitoring treatment efficacy in heart transplant recipients.
Answers are grounded in this paper and cite their sources.
Supports PCR monitoring for preemptive Chagas management in heart transplant recipients; extends observational data but leaves open prospective outcome trials.
Heart transplantation (HTx) is a useful therapy for end-stage Chagaś cardiomyopathy; however, Chagas reactivation remains a mayor complication. Parasitological methods offer poor diagnostic sensitivity, and use of more sensitive tools such as the Polymerase chain reaction (PCR) is usually necessary. In the present study, reactivation incidence and PCR usefulness for early reactivation diagnosis, as well as for treatment response evaluation during follow-up, were analyzed using Strout parasite detection test, in 10 of 222 consecutive HTx patients suffering Chagas cardiomyopathy. PCR strategies targeted to minicircle sequences (kDNA, detection limit 1 parasite/ 10 mL blood) and miniexon genes (SL-DNA, 200 parasite/10 mL) were performed to compare parasite burdens between samples. No patients received prophylactic antiprotozoal therapy (benznidazole). Five patients (50%) exhibited clinical reactivation within a mean period of 71.6 days; positive Strout results were observed in most cases presenting clinical manifestations. kDNA-PCR was positive 38-85 days before reactivation, whereas SLDNA-PCR became positive only 7-21 days later, revealing post-HTx parasitic load enhancement present prior to clinical reactivation development. Reactivations were successfully treated with benznidazole and generated negative PCR results. Results observed in this study indicate the value of PCR testing for an early diagnosis of Chagas reactivation as well as for monitoring treatment efficacy.
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Díez et al. (2007) conducted an observational in Chagas cardiomyopathy post-heart transplantation (n=10). PCR strategies (kDNA and SL-DNA) was evaluated on Early diagnosis of Chagas' disease reactivation. kDNA-PCR detected Chagas reactivation 38-85 days before clinical manifestations, while SLDNA-PCR became positive 7-21 days later, indicating PCR's value for early diagnosis.
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