CLINICAL STUDIES
Risk stratification following myocardial infarction in the thrombolytic era
a two-step strategy using noninvasive and invasive methods
Dietrich Andresen, MD, FACCa,
Gerhard Steinbeck, MD*,
Thomas Brüggemann, MSca,
Dirk Müller, MD ,
Ralph Haberl, MD*,
Steffen Behrens, MD ,
Ellen Hoffmann, MD*,
Karl Wegscheider, PhD ,
R.üdiger Dissmann, MD and
Hans-Christoph Ehlers, MDa
a Medizinische Klinik I, Urban-Krankenhaus, Berlin, Germany
* Medizinische Klinik I, Klinikum Grosshadern, Ludwig Maximilians Universität, München, Germany
Medizinische Klinik II, Klinikum Benjamin Franklin, Freie Universität, Berlin, Germany
Institute for Econometry and Statistics, University of Hamburg, Hamburg, Germany
Zentralkrankenhaus Reinkenheide, Bremerhaven, Germany
Manuscript received March 26, 1998;
revised manuscript received July 21, 1998,
accepted September 15, 1998.
Address for correspondence: Prof. Dr. Dietrich Andresen, Urban-Krankenhaus, Medizinische Klinik I, Dieffenbachstrasse 1, 10967 Berlin, Germany andresen{at}zedat.fu-berlin.de
Objectives. We prospectively performed a two-step risk assessment in patients in the early phase after acute myocardial infarction (MI).
Background. Noninvasive methods like Holter electrocardiographic monitoring (HM) and determination of the left ventricular ejection fraction (EF) as well as the invasive technique of programmed ventricular stimulation (PVS) have been used to identify patients in the late phase after MI as candidates for prophylactic implantation of a cardioverter/defibrillator. However, it is unclear whether these results can be transferred to patients following acute MI.
Methods. A series of 657 patients with acute MI ( 75 years) underwent HM and EF. If one of the two methods yielded abnormal findings (HM 20 ventricular ectopic beats/h/ 10 ventricular pairs/day/ventricular tachycardia; EF 40%), PVS was done (abnormal PVS: induction of monomorphic ventricular tachycardia, duration >10 s, cycle length 230 ms).
Results. Of 657 patients, 304 (46%) had either an abnormal HM or EF. The PVS performed in 146 of 304 patients was abnormal in 22. During a mean follow-up of 37 months, there were 106 (16%) deaths, being sudden in 24 (3.6%), nonsudden cardiac in 45 (6.8%). The incidence of arrhythmic events (sudden cardiac death, symptomatic ventricular tachycardia, cardiac arrest) was 18% (4/22) with an abnormal PVS and only 4% (5/124) with a normal PVS (odds ratio 4.0, p = 0.032).
Conclusions. The rate of arrhythmic events is low in post-MI patients in the 1990s. Nevertheless, a two-step risk stratification is helpful in selecting candidates for a defibrillator trial aiming at primary prevention of sudden cardiac death after MI.
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Abbreviations and Acronyms
| | EF | = left ventricular ejection fraction | | HM | = 24-h Holter electrocardiographic (ECG) monitoring | | MI | = myocardial infarction | | PVS | = programmed ventricular stimulation | | RNV | = radionuclide ventriculography | | SCD | = sudden cardiac death | | VEB | = ventricular ectopic beats | | VC | = ventricular couplets | | VT | = ventricular tachycardia |
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