In: Cellular physiology and biochemistry, 30 (2012), Nr. 3. pp. 523-537. ISSN 1015-8987
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Abstract
Background/Aims: TASK-1 is a potassium channel predominantly expressed in heart and brain. We have previously shown that anesthetized TASK-1(-/-) mice have prolonged QT intervals in surface electrocardiograms (ECGs). In addition, heart rate variability quantified by time and frequency domain parameters was significantly altered in TASK-1(-/-) mice with a sympathetic preponderance. Aims of the present study were the analysis of QT intervals by telemetric ECGs, to determine potential influences of anesthesia and beta-adrenergic stimulation on repolarization in surface ECGs, to investigate in vivo electrophysiological parameters by intracardiac electrical stimulation and to quantify heart rate turbulence after ischemia/reperfusion or ventricular pacing in TASK-1(+/+) and TASK-1(-/-) mice. Methods: Rate corrected QT intervals (QTc) were recorded in conscious mice by telemetry and in surface ECGs following administration of various anesthetics (tribromoethanol (Avertin (R)), pentobarbital and isoflurane). TASK-1(+/+) and TASK-1(-/-) mice were characterized by programmed electrical stimulation using an intracardiac octapolar catheter. The baroreceptor reflex was analyzed by heart rate turbulence (turbulence onset and slope) after ischemia/reperfusion and by stimulated premature ventricular contractions.
Document type: | Article |
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Journal or Publication Title: | Cellular physiology and biochemistry |
Volume: | 30 |
Number: | 3 |
Publisher: | S. Karger AG |
Date Deposited: | 08 Jan 2015 09:02 |
Date: | 2012 |
ISSN: | 1015-8987 |
Page Range: | pp. 523-537 |
Faculties / Institutes: | Medizinische Fakultät Heidelberg > Neurologische Universitätsklinik |
DDC-classification: | 610 Medical sciences Medicine |