title: Prevalence and timing of regional myocardial dysfunction after rotational coronary atherectomy.
abstract: OBJECTIVE
  This study aimed to evaluate the prevalence and time course of wall motion abnormalities associated with rotational coronary atherectomy.
  
  
  BACKGROUND
  Although initial clinical studies found evidence of transient wall motion abnormalities after rotational coronary atherectomy, the prevalence and duration of these wall motion abnormalities are unknown.
  
  
  METHODS
  Using simultaneous echocardiography, we prospectively evaluated 22 patients undergoing rotational atherectomy and compared their wall motion abnormalities with those of 10 patients undergoing coronary angioplasty alone. The extent of wall motion abnormality was quantified and plotted against time to produce curves of abnormal wall motion development and recovery for the two groups.
  
  
  RESULTS
  The cumulative ischemic time was similar for the two groups ([mean +/- SD] 10.3 +/- 6 min for rotational atherectomy vs. 9.6 +/- 4.2 min for coronary angioplasty, p = 0.73). The rate of return to baseline function was significantly lower in the rotational atherectomy group than in the coronary angioplasty group (rotational atherectomy rate constant 0.069 +/- 0.079/min vs. coronary angioplasty rate constant 1.250 +/- 0.47/min, p = 0.0001). The mean time to recovery of baseline wall motion in the rotational atherectomy group (153 min, 95% confidence interval [CI] 6.5 to 3,600) was significantly longer than in the coronary angioplasty group (2.6 min, 95% CI 1.3 to 5.5, p = 0.0001). Rotational atherectomy burr time was longer in the patients who developed myocardial infarction than in those without myocardial infarction (4.7 +/- 2.4 vs. 3 +/- 1.4 min, p = 0.045).
  
  
  CONCLUSIONS
  Transient wall motion abnormalities are common after rotational coronary atherectomy and have a longer duration than those observed after coronary angioplasty. This disparity may be a consequence of differences in the mechanisms by which rotational coronary atherectomy and coronary angioplasty produce their effect.
authors.affiliation: Cardiac Unit, Massachusetts General Hospital, Boston 02114, USA.
authors.forename: M J
authors.initials: MJ
authors.lastname: Williams
authors.forename: C J
authors.initials: CJ
authors.lastname: Dow
authors.forename: J B
authors.initials: JB
authors.lastname: Newell
authors.forename: I F
authors.initials: IF
authors.lastname: Palacios
authors.forename: M H
authors.initials: MH
authors.lastname: Picard
mesh_terms: D000368:Aged; D015906:Angioplasty, Balloon, Coronary; D017225:Atherectomy, Coronary / Q000009:adverse effects*; D003251:Constriction, Pathologic; D017023:Coronary Angiography; D003327:Coronary Disease / Q000000981:diagnostic imaging / Q000601:surgery / Q000628:therapy*; D004452:Echocardiography; D005260:Female; D006321:Heart / Q000503:physiopathology; D006801:Humans; D008297:Male; D008875:Middle Aged; D009203:Myocardial Infarction / Q000000981:diagnostic imaging / Q000209:etiology*; D011446:Prospective Studies; D013997:Time Factors