Estudo clínico e de fatores de risco associados às alterações cardiovasculares em cães / Clinical study and associated risk factors of cardiovascular alterations in dogs

O conhecimento clínico das alterações cardíacas em cães é de fundamental importância na formulação de diagnósticos diferenciais e instituição terapêutica na rotina da Clínica Médica de Pequenos Animais. Objetivaram-se com este estudo descrever os aspectos clínicos, epidemiológicos e radiográficos inerentes as alterações cardiovasculares de cães cardiopatas atendidos no Hospital Veterinário de Patos-PB (HV). Para isso foram avaliados os prontuários clínicos de todos os animais atendidos no período de Janeiro de 2007 a Dezembro de 2012, selecionando-se 131 cães (GCARD) que apresentavam histórico, alterações clínicas e radiográficas compatíveis com cardiopatia. Para fins comparativos, um grupo controle sem cardiopatia de igual número foi criado (GCON). Para análise estatística foram utilizados o teste de qui-quadrado ou teste exato de Fisher e regressão logística múltipla, com nível de significância de 5%, utilizando-se o programa SPSS 20.0 for Windows. Edema pulmonar e alterações morfológicas cardíacas foram os achados radiográficos mais frequentes. Não houve diferença quanto ao sexo e prevaleceram os animais mais velhos e da raça poodle. Tosse, cansaço e tristeza foram as queixas mais comuns. Sopro, tártaro e alterações oculares foram os sinais clínicos de maior ocorrência. As variáveis relacionadas ao engasgo, tontura/fraqueza, creptação pulmonar, ascite, obesidade, tumor e tártaro foram identificadas como associadas às cardiopatias. O modelo final apresentou ajuste satisfatório (teste de Hosmer e Lemeshow: χ2=0,221; P=0,994; R2 = 0,46). Mesmo que não seja possível determinar o diagnóstico etiológico das cardiopatias, faz-se necessário que um amplo conhecimento clínico e epidemiológico destes seja cada vez mais consolidado, de modo que as consequências fisiopatológicas dos distúrbios cardíacos sejam rapidamente identificados, trazendo qualidade de vida a todos os pacientes cardiopatas.(AU)

The clinical knowledge of cardiac disorders in dogs is fundamental to diagnose and apply appropriate therapy in the routine of a Small Animal Clinic. The objective of this study was to describe the clinical, epidemiological and radiographic aspects inherent to cardiovascular changes of cardiopathic dogs examined at the Veterinary Hospital of Patos/PB, Brazil. Clinical records of all animals treated between January 2007 and December 2012 were evaluated. The 131 dogs (GCARD) selected for the study had clinical and radiographic changes compatible with heart disease. For comparison, a control group (GCON) with the same number of dogs with no history of heart disease was formed. Pulmonary edema and cardiac morphological alterations were the most frequent radiographic finding. The results showed that gender was not a factor; however, older Poodles were more commonly affected by cardiac disorders. Cough, tiredness and sadness were the most frequent complaints. Cardiac murmur, dental plaque and ocular abnormalities were the most frequent clinical signs. Variables related to choking (OR=14.59), dizziness/weakness (OR=8.6), pulmonary crepitation (OR=37.34), ascites (OR=18.32), obesity (OR=12.28), tumor (OR=4.25) and dental plaque (OR=3.75) were identified as associated with heart disease. Even if it is not possible to determine the etiologic diagnosis of heart diseases, a broad clinical and epidemiological knowledge of these diseases is necessary, so that the pathophysiological consequences of heart disease are quickly identified, bringing quality of life to all cardiopathic patients.(AU)

Caffeine teratogenicity in rats: morphological characterization and hypothesized mechanisms

Caffeine consumption during pregnancy has been shown in the scientific literature to be associated with teratogenicity such as low birth weight, fetal malformations, and miscarriage. However, the morphological alterations of the offspring of dams exposed during pregnancy have not been consistently described, and the mechanisms why they occur remain elusive. Thus, we aimed to characterize the offspring malformations induced by moderate and high doses of caffeine during pregnancy. Dams were divided into three groups: control, moderate (0.3 g/L), and high dose (1.0 g/L) of caffeine, which was provided in the drinking water beginning on gestational day 1 and continuing throughout the entire gestation. At moderate doses, only one of the dams had stillborn pups, although no macroscopic malformations were observed. High doses of caffeine induced significantly more malformations (P<0.001) and early death (before P4). The malformations observed were related to fetal development and cardiovascular alterations, namely bruises, macrocephaly with short limbs, abnormal development (or absence) of head structures and limbs, labial malformations, hydrops fetalis, and poor placental formation. We discussed the proposed mechanisms by which caffeine might induce these phenotypes, which may involve down-regulation of adenosine A1 receptors, and increased mothers' catecholamines. Our findings further confirm the evidence of the teratogenic effects of high doses of caffeine administered during pregnancy. These findings support the recommendation to avoid caffeine exposure during pregnancy (AU)