title: Short- and long-term evolution of unstented nonocclusive coronary dissection after coronary angioplasty.
abstract: OBJECTIVE
  We assessed the short- and long-term clinical and angiographic outcome of nonocclusive unstented dissection after percutaneous transluminal coronary angioplasty (PTCA) and its correlation with restenosis.
  
  
  BACKGROUND
  The use of stents has dramatically increased both the number and the cost of coronary revascularization procedures. However, this technique is not completely risk free, and its benefits have not been fully demonstrated in uncomplicated dissections.
  
  
  METHODS
  We studied 129 consecutive patients with 49 nonocclusive dissections after PTCA (grades A to D of National Heart, Lung, and Blood Institute classification) and good distal flow (TIMI [Thrombolysis in Myocardial Infarction] flow grade 3). All patients underwent coronary angiography at 24 h and at six months post-PTCA. Clinical status was assessed every three months in the outpatient clinic. Study subjects were matched with 60 other patients in whom stenting was performed for the presence of dissection.
  
  
  RESULTS
  In the former group, all but two patients (with type E dissection, which evolved to coronary occlusion and myocardial infarction) improved their dissection score during follow-up: at six months only 18 dissections were still angiographically visible, and no clinical adverse events were recorded. In the dissected vessels, the restenosis rate was significantly lower than in those without dissection (12% vs. 44%, p < 0.001); in the stented vessels, the restenosis rate was 25% (15/60).
  
  
  CONCLUSIONS
  In the presence of TIMI flow grade 3, coronary dissection is associated with a favorable outcome and predicts a low restenosis rate. These results caution against the indiscriminate use of intravascular prostheses in the event of nonocclusive coronary dissection.
authors.affiliation: Division of Cardiology, Istituto Scientifico H San Raffaele, Milan, Italy.
authors.forename: A
authors.initials: A
authors.lastname: Cappelletti
authors.forename: A
authors.initials: A
authors.lastname: Margonato
authors.forename: G
authors.initials: G
authors.lastname: Rosano
authors.forename: A
authors.initials: A
authors.lastname: Mailhac
authors.forename: F
authors.initials: F
authors.lastname: Veglia
authors.forename: A
authors.initials: A
authors.lastname: Colombo
authors.forename: S L
authors.initials: SL
authors.lastname: Chierchia
mesh_terms: D000328:Adult; D000368:Aged; D000787:Angina Pectoris / Q000628:therapy*; D015906:Angioplasty, Balloon, Coronary / Q000009:adverse effects*; D017023:Coronary Angiography; D003331:Coronary Vessels / Q000473:pathology*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D012008:Recurrence; D015607:Stents; D013997:Time Factors