Ischemic threshold and myocardial stunning in the aging heart

Pasquale Abete, Angelo Cioppa, Claudio Calabrese, Imma Pascucci, Francesco Cacciatore, Claudio Napoli, Vincenzo Carnovale, Nicola Ferrara, Franco Rengo

Research output: Contribution to journalArticle

Abstract

The aging heart appears to be more susceptible to ischemia-reperfusion injury than the adult heart. There is no evidence of an age-related difference in the threshold of myocardial ischemia and myocardial stunning. We studied the effects on mechanical, hemodynamic, and metabolic parameters of graded reduction of coronary perfusion pressure from 66 to 29 mmHg in isolated and perfused hearts from adult and senescent rats. Cardiac function was also assessed during recovery following ischemic period. In both adult and senescent hearts developed pressure and +dP/dt linearly decreased and end-diastolic pressure linearly increased with decreasing perfusion pressure. However, all mechanical parameters were more severely impaired in senescent than in adult hearts at 37 mmHg and 29 mmHg perfusion pressure, respectively (p <0.01 vs. adult). At 29 mmHg, in both adult and senescent hearts lactate production similarly increased whereas creatine kinase leakage did not differ from controls. Developed pressure recovered more slowly in senescent than in adult hearts (p <0.001) in the absence of cellular damage and in the presence of restoration of coronary flow. Lactate production observed at the same step of coronary perfusion pressure suggests that the ischemic threshold is similar in adult and senescent hearts. The slow recovery of myocardial contractility after the ischemic period observed in senescent hearts suggests an age-related increase in myocardial stunning.

Original languageEnglish
Pages (from-to)875-884
Number of pages10
JournalExperimental Gerontology
Volume34
Issue number7
DOIs
Publication statusPublished - Nov 1999

Keywords

  • Aging
  • Creatine kinase
  • Lactate
  • Myocardial ischemia
  • Myocardial stunning

ASJC Scopus subject areas

  • Ageing
  • Medicine(all)

Fingerprint Dive into the research topics of 'Ischemic threshold and myocardial stunning in the aging heart'. Together they form a unique fingerprint.

  • Cite this

    Abete, P., Cioppa, A., Calabrese, C., Pascucci, I., Cacciatore, F., Napoli, C., Carnovale, V., Ferrara, N., & Rengo, F. (1999). Ischemic threshold and myocardial stunning in the aging heart. Experimental Gerontology, 34(7), 875-884. https://doi.org/10.1016/S0531-5565(99)00060-1