Abstract
To evaluate the effect of vacuum and aspiration rates on phacoemulsification efficiency and chatter using a monitored forced infusion system. Invitro animal study. John A. Moran Eye Center, University of Utah, Salt Lake City, Utah. Formalin-soaked porcine lenses were divided into 2mm cubes (tip diameter, 0.9mm). Vacuum levels were tested at 200, 300, 400, and 500mm Hg; aspiration rates at 20, 35, and 50mL/min. Torsional power was set at 60% and intraocular pressure at 50mm Hg. Increasing vacuum increased efficiency regardless of aspiration rates (R(2)= 0.92; P= .0004). Increasing aspiration further increased efficiency when vacuum was at 400 and 500mm Hg (P= .004 for 20 vs 35mL/min, P= .0008 for 35 vs 50mL/min). At 200 and 300mm Hg, efficiency only improved when increasing aspiration to 35mL/min (P < .0001 with 20 vs 35+ 50mL/min). Chatter improved with increasing vacuum, up to 400mm Hg (P= .003 for 200 vs 300mm Hg and P= .045 for 300 vs 500mm Hg). A similar trend of improved chatter was seen with increasing levels of aspiration. Vacuum improved efficiency up to 500mm Hg independent of flow. Flow has an additive effect on efficiency through 50mL/min, when vacuum is at 400mm Hg or higher, and only up to 35mL/min at vacuums less than 400mm Hg. Chatter correlated with both vacuum and flow such that increasing either parameter decreases chatter, up to 400mm Hg with vacuum.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call