Presence of sympathetically denervated but viable myocardium and its electrophysiologic correlates after early revascularised, acute myocardial infarction.

Simoes, MV; Barthel, P; Matsunari, I; Nekolla, SG; Schömig, A; Schwaiger, M; Schmidt, G; Bengel, FM

doi:10.1016/j.ehj.2004.02.016

journal article

Titel:: Presence of sympathetically denervated but viable myocardium and its electrophysiologic correlates after early revascularised, acute myocardial infarction.
Dokumenttyp:: Journal Article
Autor(en):: Simoes, MV; Barthel, P; Matsunari, I; Nekolla, SG; Schömig, A; Schwaiger, M; Schmidt, G; Bengel, FM
Abstract:: AIMS: After acute myocardial infarction (AMI), regional denervation exceeding the scar area has been described. We sought to define the electrophysiologic correlates of denervated, but viable, myocardium by combining scintigraphic imaging with extensive electrocardiographic evaluation in AMI patients treated with early reperfusion therapy. METHODS AND RESULTS: Within 14 days after AMI, 67 consecutive patients underwent radionuclide imaging of myocardial resting perfusion using (201)thallium and of presynaptic sympathetic innervation using (123)I-metaiodobenzylguanidine (MIBG). The mean left ventricular ejection fraction was 58+/-15%. Electrophysiologic studies included evaluation of ventricular repolarisation (resting ECG), depolarisation (signal-averaged ECG), and 24-h Holter monitoring. The perfusion defect, innervation defect, and perfusion/innervation mismatch size of the left ventricle were 14+/-15%, 39+/-22%, and 26+/-16%, respectively. Mismatch was present in 60/67 patients (90%) and correlated with prolonged repolarisation defined by QTc interval (r = 0.40; P < 0.001), and with indexes of delayed depolarisation from signal-averaged ECG (r = -0.32; P = 0.014). Other electrophysiologic parameters did not correlate. During follow-up (4.3+/-1 years) event rates were low, with two cardiac deaths and no severe ventricular arrhythmia causing hospitalisation. CONCLUSIONS: After early reperfusion for myocardial infarction, viable but denervated myocardium is frequent and correlates with slow depolarisation and repolarisation. However, in patients with small infarct size and preserved left ventricular function, these findings seem to have little influence on outcome.
Zeitschriftentitel:: Eur Heart J
Jahr:: 2004
Band / Volume:: 25
Heft / Issue:: 7
Seitenangaben Beitrag:: 551-7
Sprache:: eng
Volltext / DOI:: doi:10.1016/j.ehj.2004.02.016
PubMed:: http://view.ncbi.nlm.nih.gov/pubmed/15120051
Print-ISSN:: 0195-668X
TUM Einrichtung:: I. Medizinische Klinik und Poliklinik (Kardiologie); Klinik und Poliklinik für Nuklearmedizin
BibTeX

Vorkommen:

mediaTUM Gesamtbestand Einrichtungen Schools TUM School of Medicine and Health Departments Clinical Medicine Klinik und Poliklinik für Innere Medizin I, Kardiologie (Prof. Laugwitz)2004

mediaTUM Gesamtbestand Einrichtungen Schools TUM School of Medicine and Health Departments Clinical Medicine Klinik und Poliklinik für Nuklearmedizin (Prof. Weber)2004