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Ultrasonographic assessment of the ductus arteriosus and interatrial septum in healthy neonatal Warmblood foals

Book Contribution - Book Abstract Conference Contribution

Introduction Ultrasonographic data regarding cardiac adaptations of the ductus arteriosus (DA) and interatrial septum primum (SP) and secundum (SS) characteristics during the first days of life in foals are scarce. Material and methods Cardiac auscultation, ultrasonographic dimensions including DA, SP and SS, and continuous wave (CW) Doppler findings were recorded in 16 healthy Warmblood foals at 2 (24-48h) and 5 (96-120h) days old. Results On day 2, a left-sided holosystolic murmur (grade 1-5/6) was present in all foals and a right-sided holosystolic murmur (grade 1-4/6) in 11 foals. The pulmonary artery to aortic diameter ratio (PA/Ao) was 0.67±.09. The ventral aspect of the SP thickness was 0.3±.1cm, SS thickness 0.4±.1cm and the maximal distance between both septa was 1.0±.4cm. A patent DA was visible in 15/16 foals with a maximal shunt velocity of 3.9±.5m/s. On day 5 (n=7), all foals had a left-sided holosystolic murmur (grade 2-4/6) and one a right-sided holosystolic murmur (grade 1/6). The PA/Ao (n=5) was 0.65±.10. The SP and SS thickness both were 0.4±.1cm and the distance between both septa was 0.8±.3cm. A patent DA was visible in 6/7 foals with a maximal shunt velocity of 2.9±1.3m/s. From day 2 to day 5, the ratio of end-diastolic right ventricular to left ventricular internal diameter significantly decreased (P=0.02). A fluttering SP, prolapsing in the left atrium, was visible in all foals on both days. Discussion Due to the lack of descriptive studies, ultrasonographic assessment of the DA and interatrial septum in foals remains difficult. Reference values in healthy foals are needed and the effect of disease on those findings remains to be determined. Clinical relevance A patent DA and fluttering SP are normal findings in healthy 5-day-old Warmblood foals.
Book: 14th congress of the European College of Equine Internal Medicine (ECEIM), Abstracts
Pages: 19 - 19
Publication year:2021