Stress Echocardiography Versus Coronary Angiography for Left Main Stenosis Detection

Évaluation de l'Echographie de Stress Par Comparaison à la Coronarographie Comme Outil Non Invasif de détection de la resténose Intra endoprothèse du Tronc Commun

Left main stenosis use to be treated by bypass but with the improvement of angioplasty techniques, an increasing number of patients are submit to left main coronary angioplasty. Consequences of left main intra stent stenosis can be disastrous yet, for the moment, no precise recommendation concerning the follow up of these patients exist. The investigators ought to determine if stress echocardiography can predict left main intra stent stenosis as well (non inferiorly)as control angiography that use to be done.

All patients of the study will pass coronary angiogram and stress echocardiography (treadmill of dobutamine).

Inclusion Criteria:

• patients over 18 years old able to give consent and having had left main angioplasty.

Exclusion Criteria:

• Bypass on the left anterior descending coronary artery or left circumflex (" protected left main ")
• Treating physician judge that angiography need to be done straightaway
• Follow up elsewhere than the CHUS
• Patient refusal
• Pregnant women
• Stress echo contraindication(Severe high blood pressure or malignant arrhythmia)or condition that limits interpretation (Left bundle branch block or pacemaker rhythm)