| Autor: |
Ekhson L. Holmuhamedov, Praloy Chakraborty, Andrew Oberlin, Xiaoke Liu, Mohammed Yousufuddin, Win K. Shen, Andre Terzic, Arshad Jahangir |
| Rok vydání: |
2022 |
| Předmět: |
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| Zdroj: |
Biochemical and biophysical research communications. 623 |
| ISSN: |
1090-2104 |
| Popis: |
Aging is associated with increased prevalence of life-threatening ventricular arrhythmias, but mechanisms underlying higher susceptibility to arrhythmogenesis and means to prevent such arrhythmias under stress are not fully defined. We aimed to define differences in aging-associated susceptibility to ventricular fibrillation (VF) induction between young and aged hearts. VF induction was attempted in isolated perfused hearts of young (6-month) and aged (24-month-old) male Fischer-344 rats by rapid pacing before and following isoproterenol (1 μM) or global ischemia and reperfusion (I/R) injury with or without pretreatment with low-dose tetrodotoxin, a late sodium current blocker. At baseline, VF could not be induced; however, the susceptibility to inducible VF after isoproterenol and spontaneous VF following I/R was 6-fold and 3-fold higher, respectively, in old hearts (P 0.05). Old animals had longer epicardial monophasic action potential at 90% repolarization (APD |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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