Evaluation of the heart rate during initial active standing in patients with vasovagal syncope

Authors

Keywords:

síncope vasovagal, frecuencia cardiaca, bipedestación activa, sistema nervioso autónomo.

Abstract

Introduction: Vasovagal syncope is the most frequent cause of brief loss of consciousness, in its etiopathogenesis an autonomic dysfunction is reported that can be manifested in immediate active standing.
Objective: To compare the dynamics of heart rate changes during immediate active standing of patients suffering from vasovagal syncope with control subjects.
Methods: 132 supposedly healthy subjects (group A) between 18 and 25 years old and 156 patients with vasovagal syncope were evaluated, which were divided by their response to prolonged standing, negative 111 (group B) and positive 45 (group C). Electrocardiographic activity was recorded in the supine position and at the beginning of active standing, the sequences of RR intervals were obtained. The heart rate was compared in the 3 groups, using 22 indicators (positional, temporal, ordinal and relational, average and of the speed of changes).
Results: Differences were not found in the average indicators in the analyzed period, however, some that evaluate the speed of the initial change were significantly lower in group A compared to B and C (p<0.05), while others that evaluate the speed recovery rates were significantly lower in group C compared to A and B. This allows to characterize, compare and differentiate the groups studied during the complex and rapid interactions that occur in the change of position.
Conclusion: The dynamic of frequency changes, allowed to find indicators, which can be considered as possible predictors of an inadequate cardiovascular response in patients with vasovagal syncope.

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Author Biographies

Jose Del Carmen Iglesias Alfonso, Hospital Militar Central Carlos J. Finlay

Dr. en Medicina, Especialista de I y II grado en fisiología normal y patologica. Dr. CM, Profesor Titular, como Investigador Auxiliar ha trabajado durante los ultimos 20 años en la línea de investigación y desarrollo de métodos y medios para el diagnostico del sistema nervioso autonomo.

Barbaro Nicolas Socarras Hernandez, Centro de Investigacion, Desarrollo y Produccion Grito de Baire

Ingeniero en Sistemas Automatizados de Direccion, Mastér en Bioingeniería y Dr. C por la UTH cujae, Investigador Titular durante los ultimos 10 años ha estado vinculado a las investigaciones y la obtencion de medios para el diagnostico de trastornos del sistema vestibular y el sistema nervioso autonomo

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Published

2021-09-14

How to Cite

1.
Iglesias Alfonso JDC, Socarras Hernandez BN. Evaluation of the heart rate during initial active standing in patients with vasovagal syncope. Rev Cubana Med Milit [Internet]. 2021 Sep. 14 [cited 2025 Apr. 8];50(3):e02101396. Available from: https://revmedmilitar.sld.cu/index.php/mil/article/view/1396

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Research Article