Abstract:
INTRODUCTION:The purpose of this study was: (1) to characterize and assess the incidence of spontaneous arrhythmias in totally naive Beagle dogs (n=51; 10 males+41 females): (2) to study the effects of permanent ECG- and LVP-probe telemetry implants both acutely and up to 233days after surgery in a subset of 11 female Beagle dogs. METHODS:Naive ECG assessments were conducted by means of 6 external telemetry leads in jacketed dogs. Telemetry ECG recordings were captured by means of implanted telemetry devices suitable for ECG, LVP and aortic blood pressure recording. Experienced laboratory personnel visually evaluated all 22h ECG recordings at different time points after implantation and evaluated the incidence and type of arrhythmia. RESULTS:The 51 healthy and totally naive Beagle dogs showed a prevalence of: 49.0% 2°AVB; 58.8% single atrial premature complexes; 17.6% junctional tachycardia; 27.5% ventricular complexes; 13.7% ventricular escape complexes; 21.6% ventricular premature complexes; 3.9% runs of ventricular complexes; 3.9% runs of ventricular escape complexes. As such, a high percentage of clinically normal Beagle dogs showed different types of arrhythmias when ECG's obtained by external telemetry leads were fully evaluated for a 22h period. The chronic implantation of a ventricular probe through the apex of the heart in 11 dogs only, resulted in higher incidences and frequencies of ventricular episodes, which (in some dogs) extended up to 8weeks. Eight months after surgery none of the implanted dogs showed ventricular tachycardia and only 10% had single ventricular or ventricular premature complexes at low frequencies. DISCUSSION:A thorough evaluation of the ECG's of Beagle dogs selected for telemetry implantation can help to avoid inherent arrhythmia-burdened dogs being implanted and used in studies where these arrhythmias will confound drug assessment by increasing the number of potential false positives.
journal_name
J Pharmacol Toxicol Methodsjournal_title
Journal of pharmacological and toxicological methodsauthors
Cools F,Janssens S,Vanlommel A,Teisman A,Towart R,Gallacher DJdoi
10.1016/j.vascn.2011.04.001subject
Has Abstractpub_date
2011-07-01 00:00:00pages
60-7issue
1eissn
1056-8719issn
1873-488Xpii
S1056-8719(11)00236-Xjournal_volume
64pub_type
杂志文章abstract:INTRODUCTION:Regulatory guidelines recommend the use of conscious, unrestrained animals for comprehensive cardiovascular safety assessment of a new therapeutic agent. Cardiovascular safety pharmacology studies normally use internal telemetry (surgical implants) in free-moving animals to monitor key ECG endpoints, like ...
journal_title:Journal of pharmacological and toxicological methods
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abstract::The acetylcholine-evoked relaxation of rabbit isolated thoracic aorta precontracted by phenylephrine was studied. Phenylephrine caused a steady contraction that was maintained for 6 h. In the presence of calcium disodium ethylenediaminetetraacetate (EDTA) and ascorbic acid the contraction decreased with time. N(G)-Nit...
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更新日期:2020-01-01 00:00:00
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