Continuous vs Pulsed Oscillatory Ultrasound in cataract phacoemulsification

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Continuous vs Pulsed Oscillatory Ultrasound in cataract phacoemulsification The authors have not financial interest

Continuous vs Pulsed Oscillatory Ultrasound in cataract phacoemulsification The authors have not financial interest in the subject matter of this poster.

García - Ramírez Laura MD, Cervantes - Coste Guadalupe MD, Velasco - Barona Cecilio

García - Ramírez Laura MD, Cervantes - Coste Guadalupe MD, Velasco - Barona Cecilio MD, Asociación para Evitar la Ceguera en México *adrygarcia 09@hotmail. com

Objective • To compare the effectiveness between continuous versus pulsed oscillatory ultrasound, in cataract

Objective • To compare the effectiveness between continuous versus pulsed oscillatory ultrasound, in cataract removal with phacoemulsification.

Methods • Prospective study of 20 eyes with nuclear cataract N 2 or N

Methods • Prospective study of 20 eyes with nuclear cataract N 2 or N 3 (LOCS III). • Cataract surgery was performed by one surgeon (CFB) with oscillatory ultrasound (INFINITI Vision System®) and “stop and chop” technique.

Methods • The nucleous was divided in 2 halves. The first fragment was emulsified

Methods • The nucleous was divided in 2 halves. The first fragment was emulsified with continuous oscillatory or pulsed ultrasound in a randomized mode. • All parameters were the same for both ultrasound modalities. • Amplitude 80%, vaccum 380 mm. Hg, aspiration 40 cc/min , dynamic rise 1, bottle height 110 cm. • At the end of the surgery, metrics for each half was recorded.

Methods Figure 1 y 2. Metrics recorded for continuous torsional ultrasound. Figure 3 y

Methods Figure 1 y 2. Metrics recorded for continuous torsional ultrasound. Figure 3 y 4. Metrics recorded for pulsed torsional ultrasound.

Results • We studied 20 patients, (12) 60 % female and (8) 40% male,

Results • We studied 20 patients, (12) 60 % female and (8) 40% male, older than 30 years old. • Of the studied eyes, 14 (70%) were rigth eyes and Series 1 6(30%) were right eyes. LE 30% RE 70%

Results Continuous oscillatory ultrasound Pulsed oscillatorory ultrasound UST 32. 25 sec ± 9. 78

Results Continuous oscillatory ultrasound Pulsed oscillatorory ultrasound UST 32. 25 sec ± 9. 78 17. 70 sec ± 6. 76 <0. 5 CDE 5. 84 ± 2. 83 3. 84 ± 1. 50 <0. 004 UST : ultrasound time CDE: cumulated dissipated energy P

Results ULTRASOUND TIME 60 50 Graphic No. 1 Relation between the ultrasound time reported

Results ULTRASOUND TIME 60 50 Graphic No. 1 Relation between the ultrasound time reported with the two modalities. (P<0. 5) 40 30 20 10 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Continuous Pulsed CDE RELATION Graphic No. 2 Relation of cumulated dissipated energy reported with the two modalities. (P< 0. 004) 16 14 12 10 8 6 4 2 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Continuous Pulsed

Conclusion ü Pulsed oscillatory ultrasound is more effective than the continuous oscillatory mode, in

Conclusion ü Pulsed oscillatory ultrasound is more effective than the continuous oscillatory mode, in cataract removal (N 2 or N 3 LOCSIII) with phaco surgery.