BackgroundRadionuclide ventriculography (RV) is a validated method to evaluate the left
ventricular systolic function (LVSF) in small rodents. However, no prior
study has compared the results of RV with those obtained by other imaging
methods in this context.ObjectivesTo compare the results of LVSF obtained by RV and echocardiography (ECHO) in
an experimental model of cardiotoxicity due to doxorubicin (DXR) in rats.
MethodsAdult male Wistar rats serving as controls (n = 7) or receiving DXR (n = 22)
in accumulated doses of 8, 12, and 16 mg/kg were evaluated with ECHO
performed with a Sonos 5500 Philips equipment (12-MHz transducer) and RV
obtained with an Orbiter-Siemens gamma camera using a pinhole collimator
with a 4-mm aperture. Histopathological quantification of myocardial
fibrosis was performed after euthanasia.ResultsThe control animals showed comparable results in the LVSF analysis obtained
with ECHO and RV (83.5 ± 5% and 82.8 ± 2.8%, respectively, p
> 0.05). The animals that received DXR presented lower LVSF values when
compared with controls (p < 0.05); however, the LVSF values obtained by
RV (60.6 ± 12.5%) were lower than those obtained by ECHO (71.8
± 10.1%, p = 0.0004) in this group. An analysis of the correlation
between the LVSF and myocardial fibrosis showed a moderate correlation when
the LVSF was assessed by ECHO (r = -0.69, p = 0.0002) and a stronger
correlation when it was assessed by RV (r = -0.79, p < 0.0001). On
multiple regression analysis, only RV correlated independently with
myocardial fibrosis.ConclusionRV is an alternative method to assess the left ventricular function in small
rodents in vivo. When compared with ECHO, RV showed a better correlation
with the degree of myocardial injury in a model of DXR-induced
cardiotoxicity.
Introdução: Os avanços no manejo da fibrose cística (FC) permitiram um aumento significativo da expectativa de vida dos indivíduos fibrocísticos Objetivo: Caracterizar o perfil epidemiológico e clínico dos pacientes com FC assistidos no ambulatório de um hospital universitário de referência no tratamento da doença. Métodos: Por meio da consulta aos prontuários dos pacientes em acompanhamento, foi realizada uma pesquisa descritiva, retrospectiva, entre janeiro a agosto de 2015. Resultados: A média de idade dos pacientes no período da avaliação e a média de idade ao diagnóstico foram de 10,06±6,93 e 1,71±3,28 anos, respectivamente. A maior parte da população era do sexo feminino, caucasiana, eutróficos, residentes fora do município de referência, possuía insuficiência pancreática, apresentava colonização bacteriana e realizava exercícios respiratórios, conforme orientados no ambulatório. A média do escore de Shwachman-Kulczycki foi de 88,63±11,09. Conclusão: Este perfil favorável evidencia que uma boa adesão ao tratamento e a compreensão acerca das orientações oferecidas pela equipe multiprofissional contribuíram para a manutenção do bom estado geral e estabilização dos sintomas.
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