Abstract
Introduction: Vasovagal Syncope presents prodromes due to autonomic activation and it can be brought by prolonged standing. This fact may be associated with failure in the venous return; therefore the object of this study is the evaluation of Inferior Vena Cava (IVC) and its flow. Hypothesis: IVC flow velocity is associated, with vasovagal syncope. Methods: Two groups were evaluated with echocardiography. Group A 12 healthy individuals, 10 women aged 39 ± 17 and 2 men aged 33 ± 11. Group B, 10 patients with Vasovagal Syncope, 8 women aged 29 ± 8 and 2 men aged 23 ± 3. IVC Echocardiography was performed according to ASE criteria. Standing sub costal view was obtained with cervical flexion. IVC diameter was measured 2 cm from right atrium entry; flow velocity was evaluated sub and post diaphragmatic, supine and standing, during expiration. Results: Table 1. IVC Variables Comparison between groups A and B. Conclusions: Group B Syncope, showed AP IVC diameter and an area significantly larger in supine and standing, sub diaphragmatic position. This fact could explain lower velocities in sub diaphragmatic supine and standing position in Group B which could explain the cause of syncope.
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