In 43 Swiss hospitals, 824 patients have been included in the ISIS-3 t
rial with suspected or proven myocardial infarction. Another 504 patie
nts with proven myocardial infarction have been excluded for various r
easons and have been registered in the study log-book (total 1328 pati
ents). The usual clinical contraindications for thrombolysis are liste
d and discussed in this paper. 1/3 of those patients excluded from the
trial had not received thrombolysis without clear contraindications (
age, diabetes, anticoagulation, candidates for a pace-maker) and anoth
er 27 % have had only relative contraindications (resuscitation, punct
ure, ulcer pain, hypertension). The new guidelines for thrombolytic th
erapy allowed more patients to benefit from this therapy.