Peri-ictal QTc changes are not associated with hypoxemia.

Abstract:

:It has previously been suggested that abnormalities in cardiac repolarization (QTc lengthening and shortening) are more likely to accompany seizures with hypoxemia and may be involved in sudden unexpected death in epilepsy (SUDEP). Accordingly, we evaluated for associations between peri-ictal QTc changes and hypoxemia. We performed a reanalysis of cardiac and respiratory data gathered prospectively in our epilepsy monitoring units. The Bazett, Fridericia, Framingham, and Hodges heart rate correction formulas were utilized to calculate QTc in the pre-ictal, ictal, and post-ictal periods. Hypoxemia (defined as a drop in oxygen saturation below 90% for at least four contiguous seconds) was also examined during identical periods. Fifty-eight seizures from 29 patients were analyzed. Peri-ictal hypoxemia was not rare, occurring in 18/58 (31%) seizures. QTc lengthening was more commonly observed than shortening, with 11/58 (19%) seizures demonstrating peri-ictal QTc values≥500 using the Bazett formula. There was no significant difference between the minimum and maximum QTc values in seizures with and without peri-ictal hypoxemia, regardless of the correction formula utilized. All examined parameters of QTc lengthening and shortening were not associated with peri-ictal hypoxemia. This suggests that factors other than hypoxia result in peri-ictal cardiac repolarization abnormalities.

journal_name

Epilepsy Res

journal_title

Epilepsy research

authors

Moseley BD,Britton JW

doi

10.1016/j.eplepsyres.2014.03.016

subject

Has Abstract

pub_date

2014-07-01 00:00:00

pages

982-5

issue

5

eissn

0920-1211

issn

1872-6844

pii

S0920-1211(14)00090-4

journal_volume

108

pub_type

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