Document Detail


Dynamic beat-to-beat QT-RR relationship during physiotherapy effort in elderly patients without primary heart disease.
MedLine Citation:
PMID:  10461303     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The ECGs from 18 patients hospitalized in a rehabilitation setting, following surgery for hip fracture, were examined to characterize the dynamic behavior of uncorrected QT interval in relation to changing RR interval during physiotherapy effort. ECG waveforms were analyzed to extract beat-to-beat QT and RR intervals using a computerized ECG Analyzer (CEA-1100). The method of defining the QT and RR intervals is based on performing multiple cross-correlations that enable rejection of artifacts from the analysis. The relationship between the RR and QT intervals was found using the following general formula QTi = cRRi-1b. Linear regression was performed on the logarithms of QT and RR measurements obtained to estimate the constant (a = log c) and the slope (b) values, reflecting the dynamic change of QT during physiotherapy effort. Having these two values, the dynamic QT extrapolated to a heart period of 1 second (QTcd) was calculated. The results were compared to the conventional corrected static QT according to the Bazzet formula (QTcs). The mean values of constants (a = log c) and slopes (b) over all patients were found to be 1.61 +/- 0.23 and 0.33 +/- 0.08, respectively, giving a QT (ms) heart-period (ms) dynamic relation of QTi = 41 x RR(i-1)0.33. The correlation between the dynamic QT and the static QT intervals was not significant. The mean values of the QTcd and QTcs intervals were significantly different (392 +/- 25 ms vs 434 +/- 28 ms; P < 0.0001). This dynamic measurement method of QT intervals may provide additional information on normal and abnormal cardiac repolarization in health and disease, helping in the diagnosis of cardiac disorders and arrhythmia risk.
Authors:
M Arad; S Abboud; M M Radai; O Elion; S Bar-Nachum; M Zohar; A Adunsky
Related Documents :
9788783 - Resting ecg changes in long term survivors after carotid endarterectomy.
7199403 - Pathophysiology of chest pain in patients with cardiomyopathies and normal coronary art...
12189773 - Meta-analysis of flecainide safety in patients with supraventricular arrhythmias.
Publication Detail:
Type:  Comparative Study; Journal Article    
Journal Detail:
Title:  Pacing and clinical electrophysiology : PACE     Volume:  22     ISSN:  0147-8389     ISO Abbreviation:  Pacing Clin Electrophysiol     Publication Date:  1999 Aug 
Date Detail:
Created Date:  1999-10-05     Completed Date:  1999-10-05     Revised Date:  2007-11-15    
Medline Journal Info:
Nlm Unique ID:  7803944     Medline TA:  Pacing Clin Electrophysiol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  1240-4     Citation Subset:  IM    
Affiliation:
Department of Geriatric Rehabilitation, Sheba Medical Center, Tel Hashomer, Israel.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Descriptor/Qualifier:
Aged
Arrhythmias, Cardiac / diagnosis,  physiopathology
Artifacts
Automatic Data Processing
Electrocardiography / methods*
Female
Heart / physiology*
Heart Rate*
Hip Fractures / rehabilitation*
Humans
Male
Physical Therapy Modalities*
Risk Factors

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


Previous Document:  A comparison of ventricular function during high right ventricular septal and apical pacing after hi...
Next Document:  Pacing and ICD therapy in Germany (West and East) before and after reunification in 1989.