Estudo prospectivo comparativo dos ciclos de ultra-som 14% e 67% do WhiteStar TM na cirurgia de catarata por facoemulsificação com a técnica “ nuclear preslice”
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Data
2008
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Resumo
Purpose: To compare the 14% and 67% duty cycles of ultra-
sound power, continuous module, manual pulse control in the
Sovereign ® phacoemulsification system with WhiteStar TM po-
wer modulation for cataract surgery. The phacoemulsification
nuclear preslice technique was used to evaluate effective ul-
trasound time, ultrasound percentage, salt solution amount
and endothelial cell loss. Methods: This was a prospective
and comparative clinical trial in 32 patients (38 eyes) with
senile nuclear cataract NO3 NC3 and NO4 NC4 (LOCS III)
divided into two groups: A and B. To perform the cataract
surgery phacoemulsification with nuclear preslice technique,
manual pulse control was used; for group A with 14% duty
cycle (n=21) and group B with 67% duty cycle (n=17). Both
groups were subdivided according to crystalline opaque level
in two subgroups. Preoperative measures included complete
ophthalmologic examination, biometry, pachymetry and spe-
cular microscopy and 3 months after surgery specular micros-
copy. Results: The surgeries that were used with the 67%
duty cycle had significantly more ultrasound effective time
than the 14% group in more dense cataracts. The ultrasound
percentage in the 67% duty cycle, in different cataract densi-
ties, was significantly higher than in the 14% duty cycle.
There was no difference in the salt solution amount used in
the surgeries. There was no statistically significant difference
of endothelial cell loss between both ultrasound cycles. There
was a statistically significant correlation between the endo-
thelial cell loss and the variables: ultrasound effective time
(EPT) and salt solution amount used in surgeries in both
cycles. Conclusions: This clinical trial showed less effective
time of ultrasound and ultrasound percentage in the 14% duty
cycle for more dense cataracts. The salt solution amount used
and the endothelial cell loss were the same in both cycles. The
ultrasound effective time and the salt solution amount used in
the surgery were correlated to endothelial cell loss.
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Facoemulsificação, Estudo comparativo, Extração de catarata, Acuidade visual, Estudos prospectivos, Células endoteliais/ultra-sonografia, Phacoemulsification, Comparative study, Cataract extraction, Visual acuity, Prospective studies, Endothelial cells/ultrasonography
Citação
PEREIRA, Antonio Eduardo; PEREIRA, Ana Cláudia Alves; ÁVILA, Marcos Pereira. Estudo prospectivo comparativo dos ciclos de ultra-som 14% e 67% do WhiteStarTM na cirurgia de catarata por facoemulsificação com a técnica. Arquivos Brasileiros de Oftalmologia, São Paulo, v. 71, n. 5, p. 695-700, 2008.