Document Detail


Shortening of the QT Interval After Food Can Be Used to Demonstrate Assay Sensitivity in Thorough QT Studies.
MedLine Citation:
PMID:  22067197     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
The effect of food was investigated under conditions of a thorough QT (TQT) study and with confirmation of assay sensitivity by the use of a positive control (400 mg of moxifloxacin). Fifty-five healthy subjects were randomized to treatment and a sequence of fasted and fed baseline electrocardiography days. Subjects received standard breakfast 30 to 10 minutes prior to dosing. Measurement of QT interval was performed automatically with subsequent manual onscreen overreading using electronic calipers. A profound increase in heart rate of 9.4 bpm was observed in the fed condition compared with the fasted condition at 1.5 hours after dose with a corresponding shortening of QT (27 milliseconds); (baseline data). When corrected, QTcF interval was shortened significantly with the maximal effect observed at 2 hours after dose of 8.2 (95% confidence interval, 6-10) milliseconds. A concurrent shortening of the PR interval with a maximum value of 5.6 milliseconds was also observed. The findings of this study demonstrate that food alters the QT-RR relationship and shortens QTc and PR for at least 4 hours after a carbohydrate-rich meal. The findings are of regulatory interest as this study shows that normal physiological causes can shorten QTc significantly and that it could be used as a method to demonstrate assay sensitivity.
Authors:
Jorg Taubel; Alex H Wong; Asif Naseem; Georg Ferber; A John Camm
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-11-8
Journal Detail:
Title:  Journal of clinical pharmacology     Volume:  -     ISSN:  1552-4604     ISO Abbreviation:  -     Publication Date:  2011 Nov 
Date Detail:
Created Date:  2011-11-9     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0366372     Medline TA:  J Clin Pharmacol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Affiliation:
Richmond Pharmacology Ltd.
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