Estudo prospectivo comparativo dos ciclos de ultra-som 14% e 67% do WhiteStar na cirurgia de catarata por facoemulsificação com a técnica Nuclear Preslice

AUTOR(ES)
DATA DE PUBLICAÇÃO

2007

RESUMO

Purpose: To compare the 14% and 67% duty cycles of ultrasound power, continuous module, pulse manual control in the Sovereign phacoemulsification system with WhiteStar power modulation for cataract surgery. The phacoemulsification Nuclear Preslice technique was used to evaluate ultrasound effective time, ultrasound percentage, infusion volume amount and endothelial cell loss. Methods: This was a prospective and comparative clinical trial in 32 patients (38 eyes) with senile nuclear cataract NO3 and NO4 NC4 (LOCS III) divided in two groups: A and B. To perform the cataract surgery the phacoemulsification with Nuclear Preslice technique was used with manual pulse control, for group A with 14% duty cycle (n=21) and group B with 67% duty cycle (n=17). Both groups were subdivided according to cristaline opaque level in two sub-groups. Preoperative measures included complete ophthalmologic exam, biometry, pachymetry and specular microscopy, postoperative 24 hours pachymetry and visual acuity, specular microscopy was mensured at 3 months follow up. Results: The surgeries that was used 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 densities, was significantly more than in the 14% duty cycle. There was no difference in the infusion volume amount used in the surgeries. There was no difference statistically significant in endothelial cell loss in both ultrasound cycles. There was statistically significant correlation between the endothelial cell loss and the variables: ultrasound effective time (EPT) and infusion volume 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 infusion volume amount used and the endothelial cell loss were the same in both cycles. The ultrasound effective time and the infusion volume amount used in the surgery were correlated to endothelial cell loss.

ASSUNTO(S)

células endoteliais facoemulsificação estudos prospectivos ciencias da saude extração de catarata ultra-som

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