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

2. Asociación para Evitar la Ceguera en México
García - Ramírez Laura MD,
Cervantes - Coste Guadalupe MD,
Velasco - Barona Cecilio MD,
Asociación para Evitar la Ceguera en México

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

4. Methods
Prospective study of 20 eyes with nuclear cataract N2 or N3 (LOCS III).
Cataract surgery was performed by one surgeon (CFB) with oscillatory ultrasound (INFINITI Vision System®) and “stop and chop” technique.

5. 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 380mmHg, aspiration 40cc/min , dynamic rise 1, bottle height 110cm.
At the end of the surgery, metrics for each half was recorded.

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

7. 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 6(30%) were right eyes.

8. Results Continuous oscillatory ultrasound Pulsed oscillatorory P 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

9. Results
Graphic No. 1 Relation between the ultrasound time reported with the two modalities. (P<0.5)
Graphic No. 2 Relation of cumulated dissipated energy reported with the two modalities.
(P< 0.004)

10. Conclusion
Pulsed oscillatory ultrasound is more effective than the continuous oscillatory mode, in cataract removal (N2 or N3 LOCSIII) with phaco surgery.