previous article in this issue | next article in this issue |
Document Details : Title: Effect of pre-infarction angina on ventricular late potentials in patients with acute myocardial infarction and successful thrombolysis Author(s): EVRENGUL, Harun , KAYIKCIOGLU, Meral , CAN, Levent , PAYZIN, Serdar , KULTURSAY, Hakan Journal: Acta Cardiologica Volume: 58 Issue: 4 Date: August 2003 Pages: 295-301 DOI: 10.2143/AC.58.4.2005286 Abstract : Objective —Pre-infarction angina is considered as a good clinical model of ischaemic precondi- tioning which facilitates myocardial protection. Late potentials (LP) have prognostic significance fol- lowing acute myocardial infarction (AMI).It is also well established that thrombolytic therapy reduces the incidence of LP. Our aim was to evaluate the relationship between pre-infarction angina and LP in patients receiving successful thrombolytic therapy. Methods and results —We prospectively studied 55 patients presenting with AMI (<6 hours). All patients received thrombolytic therapy and were evaluated with coronary angiography at pre- discharge.Signal-averaged recordings (SAECG) were obtained serially prior to thrombolysis,48 hours after and 10 days later. Pre-infarction angina was present in 14 (25%) patients.There were no signif- icant differences between the clinical characteristics and angiographic findings of the groups.Baseline SAECG parameters of the groups were also similar. After thrombolysis, the 48thhour values of LAS (the duration of the terminal low amplitude signals), and both the 10th day values of LAS and RMS (root mean square voltage of the last 40 ms of the QRS) were significantly better in the pre-infarction angina group.The mean filtered QRS duration and RMS 40 values changed significantly at the 10th day recordings of patients with pre-infarction angina [QRS duration, 110±34 ms before to 91±11 ms after (p = 0.039); RMS 40, 40±17μV before to 50±14μV after (p = 0.02)].The incidence of LP significantly decreased after thrombolytic therapy in the pre-infarction angina group, however, this change was not observed in patients without angina. Conclusion — Presence of pre-infarction angina reduces the incidence of LP following thrombolysis in AMI. This might be explained by the possible beneficial effect of ischaemic preconditioning on the arrhythmogenic substrate. |