[Laser coronary angioplasty. Critical analysis of the first patients].
OBJECTIVE
To evaluate the success rate and complications, as well as the technical difficulties involved catheter laser coronary angioplasty, making evident the unsuccessful cases.


METHODS
Twenty eight patients were treated with laser from August to November, 1993. The treatment was complemented with balloon angioplasty. Lesions were complex: 10 (36%) were type B and 18 (64%), type C. Concerning the obstruction grade, 18 (64%) were > or = 95%. Laser generator CVX 300(TM) Spectranectics as well as Extreme(TM) and Vitesse(TM) catheters with 1.4, 1.7 and 2.0mm in diameter, concentric and excentric, were used. Laser procedure success was defined as a reduction > 20% in the obstruction grade. The procedure success was attended when the residual stenosis was < 50% after a 15-minute observation, after balloon complementation.


RESULTS
The unsuccess rate with laser catheter (Lc) was 34% (10 lesions) of which 3 cases were solved by other methods, 5 were not successful because of anatomic difficulties in surpassing the lesion and, in the two others the success criterium in the reduction of the obstruction grade of the coronary artery was not achieved, although the lesion surpassing was possible with the use of balloon catheter. The final success reached 89% (21 lesions). The procedure complications were a case of thrombosis, a perforation accompanied by a myocardial infarction and another myocardial infarction (non-Q wave), all with good outcome.


CONCLUSIONS
The use of laser in the treatment of coronary artery obstructive lesions is a viable method. Nonetheless, more experience is necessary to demonstrate its actual value, optimizate the results and may be reduce restenosis rate.
Arie
S
S
Instituto do Coração do Hospital das Clínicas-FMUSP, São Paulo.
Tcheng
J E
JE
Garcia
D P
DP
Checchi
H
H
Horta
P
P
Esteves Filho
A
A
Souza
A N
AN
de Brito Júnior
F S
FS
Bellotti
G
G
Pileggi
F
F
D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D015906:Angioplasty, Balloon, Coronary / Q000009:adverse effects / Q000379:methods; D017222:Angioplasty, Balloon, Laser-Assisted / Q000009:adverse effects / Q000379:methods; D003327:Coronary Disease / Q000601:surgery*; D005069:Evaluation Studies as Topic; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged
Angioplastia coronária com o uso do laser. Análise crítica dos primeiros pacientes.