Pulmonary stenosis is a congenital disease characterized by narrowing of the right ventricular outflow tract. This change results in a resistance to blood flow and, consequently, an increase in the after load, leading to the elevation of systolic pressure of the right ventricle, resulting in concentric hypertrophy. Echocardiographic findings, such as right ventricular diastolic dysfunction, stenosis and pulmonary valve insufficiency, with regurgitant flow observed at color Doppler, were essential for diagnosis. A 5 years old small dog, attended at the Hospital Veterinário Universitário HVU / UFPI, was taken as an animal model to report the hemodynamic changes caused by pulmonary insufficiency and stenosis, in a comparative analysis to the same disease when it occurs in humans. Due to the similarities between hemodynamic findings in pulmonary stenosis of dogs and humans, this species proved to be a good animal model to evaluate the repercussion of this congenital heart disease by Doppler echocardiography
IntroductionPulmonary stenosis (PE) is a heart disease characterized by a narrowing of the right ventricular outflow tract due to the occurrence of a fibrous ring, which may manifest as congenital or rarely acquired [1]. This change causes resistance to blood flow and an increase in after load, causing elevation of right ventricular systolic pressure, resulting in concentric hypertrophy. Some canine breeds are predisposed to the occurrence of this disease,
Case PresentationIt was attended at the Hospital Veterinário Universitário da Universidade Federal do Piauí -HVU/UFPI a female dog, with no defined breed, 5 years old, weighing 4.5 kg. During the anamnesis, the owner reported that the animal presented fatigue, respiratory distress, tachypnea, tachycardia and lethargy. During the clinical examination, the animal was slightly dehydrated, pale mucosa, heart rate of 138 bpm, ascites and tachypnea. At the auscultation, it was identified grade IV / V systolic murmur, focusing on pulmonary valve. Clinical findings were compatible with heart disease.The animal was hospitalized and complementary exams such as, thoracic radiography, electrocardiography, echocardiography, abdominal ultrasonography, hemogram and biochemicals were requested. In the hemogram, no abnormalities were found, whereas in the biochemical, there was a decrease in urea and globulin levels and an increase in creatine kinase. Radiographic examination showed an increase in the cardiac silhouette, with loss of definition of the cardiac apex, globose heart, pleural The treatment with intravenous furosemide (1mg / kg), benazepril (0.5mg / kg) and sildenafil (1mg / kg) was started. However, the patient died five days after the consultation due to the aggravation of the case, and the guardian did not authorize the necropsy examination.
DiscussionPulmonary stenosis is one of the most frequent congenital heart diseases that affect dogs, and may occur alone or in association with other conditions, although the patient in question presented pulmonary ...