Characterization of an investigative safety pharmacology model to assess comprehensive cardiac function and structure in chronically instrumented conscious beagle dogs
| Autor: | Joseph J. DeGeorge, Hillary K. Regan, David B. Gilberto, Theodore J. Detwiler, Frederick Sannajust, Li Chen, Christopher P. Regan, Gary L. Stump |
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| Rok vydání: | 2016 |
| Předmět: |
Male
Cardiac function curve medicine.medical_specialty Cardiotonic Agents Drug-Related Side Effects and Adverse Reactions Drug Evaluation Preclinical Hemodynamics Blood Pressure 030204 cardiovascular system & hematology Toxicology Models Biological Risk Assessment 030226 pharmacology & pharmacy Ventricular Function Left Electrocardiography 03 medical and health sciences Dogs 0302 clinical medicine Internal medicine medicine Animals Telemetry Pharmacology Ejection fraction medicine.diagnostic_test business.industry Safety pharmacology Cardiac Pacing Artificial medicine.disease Myocardial Contraction Electrodes Implanted Pyridazines Preload Pimobendan Anesthesia Heart failure Heart Function Tests Cardiology Safety business medicine.drug |
| Zdroj: | Journal of Pharmacological and Toxicological Methods. 81:107-114 |
| ISSN: | 1056-8719 |
| Popis: | Introduction There has been an increasing need to conduct investigative safety pharmacology studies to complement regulatory-required studies, particularly as it applies to a comprehensive assessment of cardiovascular (CV) risk. Methods We describe refined methodology using a combination of telemetry and direct signal acquisition to record concomitant peripheral hemodynamics, ECG, and left ventricular (LV) structure (LV chamber size and LV wall thickness) and function, including LV pressure-volume (PV) loops to determine load independent measures of contractility (end systolic elastance, Ees, and preload recruitable stroke work, PRSW) in conscious beagle dogs. Following baseline characterization, 28 days of chronic rapid ventricular pacing (RVP) was performed and cardiac function monitored: both as a way to compare measures during development of dysfunction and to characterize feasibility of a model to assess CV safety in animals with underlying cardiac dysfunction. Results While ± dP/dT decreased within a few days of RVP and remained stable, more comprehensive cardiac function measurements, including Ees and PRSW, provided a more sensitive assessment confirming the value of such endpoints for a more clear functional assessment. After 28 days of RVP, the inodilator pimobendan was administered to further demonstrate the ability to detect changes in cardiac function. Expectedly pimobendan caused a leftward shift in the PV loop, improved ejection fraction (EF) and significantly improved Ees and PRSW. Discussion In summary, the data show the feasibility and importance in measuring enhanced cardiac functional parameters in conscious normal beagle dogs and further describe a relatively stable cardiac dysfunction model that could be used as an investigative safety pharmacology risk assessment tool. |
| Databáze: | OpenAIRE |
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