Cargando…

A Practical Method for QTc Interval Measurement

Objective The various formulae used for QT correction by heart rate (HR) require the execution of operations with the aid of calculators or applications. This study aimed to evaluate the performance of a simple rule for QTc estimation, comparing the measurements obtained with those provided by the c...

Descripción completa

Detalles Bibliográficos
Autores principales: De Oliveira Neto, Nestor R, De Oliveira, William Santos, Campos Pinto, Guilherme D, De Oliveira, Eric Santos R, Da Silveira Barros, Maria das Neves D
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Cureus 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7810174/
https://www.ncbi.nlm.nih.gov/pubmed/33489536
http://dx.doi.org/10.7759/cureus.12122
_version_ 1783637265958830080
author De Oliveira Neto, Nestor R
De Oliveira, William Santos
Campos Pinto, Guilherme D
De Oliveira, Eric Santos R
Da Silveira Barros, Maria das Neves D
author_facet De Oliveira Neto, Nestor R
De Oliveira, William Santos
Campos Pinto, Guilherme D
De Oliveira, Eric Santos R
Da Silveira Barros, Maria das Neves D
author_sort De Oliveira Neto, Nestor R
collection PubMed
description Objective The various formulae used for QT correction by heart rate (HR) require the execution of operations with the aid of calculators or applications. This study aimed to evaluate the performance of a simple rule for QTc estimation, comparing the measurements obtained with those provided by the commonly used equations of Bazett, Fridericia, Framingham, and Hodges. Methods We used the database of a previous observational study, which analyzed patients prospectively with acute pulmonary edema admitted in an emergency service. One hundred four patients were included for QTc assessment, of whom 86 patients underwent two ECG: one ECG <24h and other >24h after admission. Thus, a total of 190 ECGs were analyzed by two observers that manually measured QT and HR. QTc was obtained using the known formulae and the proposed equations: QTc = QT+2 (FC-60) for HR ≤ 90 bpm and QTc=QT+2(FC-60)-10 for HR>90 bpm. Results Bland-Altman plots show good agreement between the simple rule and Hodges equation, with a mean difference of -3,4, SD of 4.96 and 95% limits of agreement from -9,9 to 3.2. There was not a good agreement between the simple method and the other formulae. Conclusion The proposed method has good agreement with the measures of QTc by the equation of Hodges in the HR range of 40 to 130bpm in acutely ill patients. Our method may be a plausible option for quick QT correction in these subjects.
format Online
Article
Text
id pubmed-7810174
institution National Center for Biotechnology Information
language English
publishDate 2020
publisher Cureus
record_format MEDLINE/PubMed
spelling pubmed-78101742021-01-22 A Practical Method for QTc Interval Measurement De Oliveira Neto, Nestor R De Oliveira, William Santos Campos Pinto, Guilherme D De Oliveira, Eric Santos R Da Silveira Barros, Maria das Neves D Cureus Cardiology Objective The various formulae used for QT correction by heart rate (HR) require the execution of operations with the aid of calculators or applications. This study aimed to evaluate the performance of a simple rule for QTc estimation, comparing the measurements obtained with those provided by the commonly used equations of Bazett, Fridericia, Framingham, and Hodges. Methods We used the database of a previous observational study, which analyzed patients prospectively with acute pulmonary edema admitted in an emergency service. One hundred four patients were included for QTc assessment, of whom 86 patients underwent two ECG: one ECG <24h and other >24h after admission. Thus, a total of 190 ECGs were analyzed by two observers that manually measured QT and HR. QTc was obtained using the known formulae and the proposed equations: QTc = QT+2 (FC-60) for HR ≤ 90 bpm and QTc=QT+2(FC-60)-10 for HR>90 bpm. Results Bland-Altman plots show good agreement between the simple rule and Hodges equation, with a mean difference of -3,4, SD of 4.96 and 95% limits of agreement from -9,9 to 3.2. There was not a good agreement between the simple method and the other formulae. Conclusion The proposed method has good agreement with the measures of QTc by the equation of Hodges in the HR range of 40 to 130bpm in acutely ill patients. Our method may be a plausible option for quick QT correction in these subjects. Cureus 2020-12-17 /pmc/articles/PMC7810174/ /pubmed/33489536 http://dx.doi.org/10.7759/cureus.12122 Text en Copyright © 2020, De Oliveira Neto et al. http://creativecommons.org/licenses/by/3.0/ This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
spellingShingle Cardiology
De Oliveira Neto, Nestor R
De Oliveira, William Santos
Campos Pinto, Guilherme D
De Oliveira, Eric Santos R
Da Silveira Barros, Maria das Neves D
A Practical Method for QTc Interval Measurement
title A Practical Method for QTc Interval Measurement
title_full A Practical Method for QTc Interval Measurement
title_fullStr A Practical Method for QTc Interval Measurement
title_full_unstemmed A Practical Method for QTc Interval Measurement
title_short A Practical Method for QTc Interval Measurement
title_sort practical method for qtc interval measurement
topic Cardiology
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7810174/
https://www.ncbi.nlm.nih.gov/pubmed/33489536
http://dx.doi.org/10.7759/cureus.12122
work_keys_str_mv AT deoliveiranetonestorr apracticalmethodforqtcintervalmeasurement
AT deoliveirawilliamsantos apracticalmethodforqtcintervalmeasurement
AT campospintoguilhermed apracticalmethodforqtcintervalmeasurement
AT deoliveiraericsantosr apracticalmethodforqtcintervalmeasurement
AT dasilveirabarrosmariadasnevesd apracticalmethodforqtcintervalmeasurement
AT deoliveiranetonestorr practicalmethodforqtcintervalmeasurement
AT deoliveirawilliamsantos practicalmethodforqtcintervalmeasurement
AT campospintoguilhermed practicalmethodforqtcintervalmeasurement
AT deoliveiraericsantosr practicalmethodforqtcintervalmeasurement
AT dasilveirabarrosmariadasnevesd practicalmethodforqtcintervalmeasurement