open access

Vol 62, No 3 (2003)
ORIGINAL ARTICLES
Published online: 2003-06-09
Submitted: 2012-02-06
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Left ventricle systolic volume in vasovagal syncope patients

Dariusz Kozłowski, Paweł Byrdziak, Wojciech Krupa, Marcin Gawrysiak, Grzegorz Piwko, Jacek Kubica, Grażyna Świątecka
Folia Morphol 2003;62(3):175-178.

open access

Vol 62, No 3 (2003)
ORIGINAL ARTICLES
Published online: 2003-06-09
Submitted: 2012-02-06

Abstract

One of the hypotheses put forward concerning the mechanism of vasovagal syncope is that the vagal afferent fibres are activated during vigorous contractions against a partly empty left ventricle. The aim of the study was to confirm this hypothesis by using 2D echocardiography during a head-up tilt test. The study was carried out on 39 patients (17 male, 22 female, age range 21–64 years), all with a history of recurrent syncope. The patients were examined using a 2D echo to measure the end-diastolic and end-systolic volume before the head-up tilt test after the Westminster protocol (45min/60 grade) and every five minutes after tilting. T patients during head-up tilt test had a positive response and 32 proved negative. A reduction of both the end-diastolic and end-systolic volumes of the left ventricle was noticed. There was no significant difference in the degree of ejection fraction reduction. The difference in ejection fraction reduction between the two groups was similarly non-significant. It was also noticed that the patients with a positive response had more vigorous contractions than those with a negative test. The decision was therefore taken to use a different parameter for the left ventricle contraction, namely the LV posterior wall slope. As this parameter is partly dependent on time, its use in confirming the extremely vigorous nature of the contractions was considered appropriate. Only 6 patients were tested using this parameter. A tendency towards greater left ventricle posterior wall slope values, both before and during tilting was noticed in the group of patients with vasovagal reaction. Our data shows that vigorous contraction is probably less responsible for vasovagal syncope release than left ventricle volume reduction.

Abstract

One of the hypotheses put forward concerning the mechanism of vasovagal syncope is that the vagal afferent fibres are activated during vigorous contractions against a partly empty left ventricle. The aim of the study was to confirm this hypothesis by using 2D echocardiography during a head-up tilt test. The study was carried out on 39 patients (17 male, 22 female, age range 21–64 years), all with a history of recurrent syncope. The patients were examined using a 2D echo to measure the end-diastolic and end-systolic volume before the head-up tilt test after the Westminster protocol (45min/60 grade) and every five minutes after tilting. T patients during head-up tilt test had a positive response and 32 proved negative. A reduction of both the end-diastolic and end-systolic volumes of the left ventricle was noticed. There was no significant difference in the degree of ejection fraction reduction. The difference in ejection fraction reduction between the two groups was similarly non-significant. It was also noticed that the patients with a positive response had more vigorous contractions than those with a negative test. The decision was therefore taken to use a different parameter for the left ventricle contraction, namely the LV posterior wall slope. As this parameter is partly dependent on time, its use in confirming the extremely vigorous nature of the contractions was considered appropriate. Only 6 patients were tested using this parameter. A tendency towards greater left ventricle posterior wall slope values, both before and during tilting was noticed in the group of patients with vasovagal reaction. Our data shows that vigorous contraction is probably less responsible for vasovagal syncope release than left ventricle volume reduction.
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Keywords

LV systolic volume; vasovagal reaction; LV posterior wall slope

About this article
Title

Left ventricle systolic volume in vasovagal syncope patients

Journal

Folia Morphologica

Issue

Vol 62, No 3 (2003)

Pages

175-178

Published online

2003-06-09

Bibliographic record

Folia Morphol 2003;62(3):175-178.

Keywords

LV systolic volume
vasovagal reaction
LV posterior wall slope

Authors

Dariusz Kozłowski
Paweł Byrdziak
Wojciech Krupa
Marcin Gawrysiak
Grzegorz Piwko
Jacek Kubica
Grażyna Świątecka

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