Sunday, January 08, 2006

Comparison of three monoplace hyperbaric chamber intravenous infusion pumps. UHM 2005: VOL 32, ISSUE #6

Have you ever wondered about pressure and gravity functions of intravenous and other drainage tools in patients in a hyperbaric chamber? Well, here ia an article comparing the changes that take place with various infusion pumps during pressurization in a chamber.

Comparison of three monoplace hyperbaric chamber intravenous infusion pumps. L.K. Weaver, D. Ray, D. Haberstock

Abstract:

We compared the infusion accuracy of the Baxter Flo-Gard 6201,IVAC  530 and Abbott Lifecare 3HB pumps with saline and enteral formula at chamber pressures from 86.1 kPa (0.85 atm abs)to 304 kPa (3.0 atm abs).

The Baxter pump infused ±10% saline at all tested pressures and rates (1-1,999 ml/hr).At 1 ml/hour,the IVAC infused 18%more saline than expected (86.1 kPa).

The Abbott infused -15%and -23%than expected at 202.6 kPa (999 ml/hr)and 304 kPa (800 ml/hr),respectively.A 10-minute chamber compression and decompression (86.1-304-86.1 kPa) resulted in lower-than-expected measured volumes during compression (64-112%)and higher-than-expected measured volumes during decompression (62-114%)at rates of 1,5,and 10 ml/hr for all pumps.

Enteral infusions (100 ml/hour)resulted in -20%to +12%fluid volume discrepancies.In conclusion,the Baxter pump had the best overall performance.Changes observed during compression and decompression may be clinically important.