title: Intensive use of intravascular ultrasound during coronary angioplasty. A six-month campaign.
abstract: BACKGROUND
  Compared to coronary angiography, intravascular ultrasound (IVUS) gives additional information important for the percutaneous transluminal coronary angioplasty (PTCA) procedure, but is time-consuming and may cause complications.
  
  
  OBJECTIVE
  To evaluate, during a period of intensive use of IVUS, the impact of IVUS on the final decision on balloon/stent diameter, consumption of devices, time-consumption and IVUS-related complications.
  
  
  METHODS
  During a 6-month period, IVUS was contemplated in all PTCA procedures and the reason for not using IVUS was specified. We used CVIS during the first, and Endosonics during the last 3 months, and both periods started with 1 week of hands-on practice. All procedures were to be planned according to an initial quantitative coronary angiography (QCA), and the finally achieved result, material used and complications were registered.
  
  
  RESULTS
  The proportion of IVUS/PTCA was 37% during, 8% 6 months before and 12% 6 months after the study period. Three hundred and twenty-three patients were included in the study (57% of all patients), 199 of them were subjected to IVUS. The indications for PTCA during the study period were stable angina (58%), unstable angina (32%) and acute myocardial infarction (10%). The main reasons for not doing IVUS were use of 6F guiding catheter (13%), urgent procedure (12%) and occluded vessel (11%). Initial QCA detected 253 stenoses in 199 patients and 64 additional stenoses were treated, most of them probably detected by IVUS. QCA systematically underestimated vessel size, particularly in small vessels. There was a non-significant trend to more accurate estimations towards the end of the study in small vessels. Dissection, probably due to IVUS, occurred in two cases (1%). There were no significant differences in the number of devices used in IVUS compared to non-IVUS patients. The procedural time was 24 min longer in IVUS than in non-IVUS cases and more stenoses were treated per procedure in the IVUS group.
  
  
  CONCLUSIONS
  Coronary angiography often underestimated balloon/stent size but in an unpredictable way, with a substantial proportion of significant stenoses being undetected. IVUS had few serious complications, did not increase device consumption but prolonged procedural time.
authors.affiliation: Division of Cardiology, Sahlgrenska University Hospital, Göteborg, Sweden.
authors.forename: P
authors.initials: P
authors.lastname: Johansson
authors.forename: M
authors.initials: M
authors.lastname: Lundén
authors.forename: L
authors.initials: L
authors.lastname: Ekström
authors.forename: L
authors.initials: L
authors.lastname: Grip
authors.forename: B
authors.initials: B
authors.lastname: Wennerblom
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D015906:Angioplasty, Balloon, Coronary / Q000379:methods*; D017023:Coronary Angiography / Q000191:economics / Q000379:methods*; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007431:Intraoperative Complications; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies; D012307:Risk Factors; D018084:Ultrasonography, Interventional / Q000191:economics / Q000379:methods* / Q000592:standards