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Comparison of Function of Commercially Available Pleural Drainage Units and Catheters: Statistical Analysis

This essentially allows the full negative pressure of the suction source to be applied to the PDU. This appears in our experience to be a common practice utilized when setting up a PDU. To test the accuracy of the PDU in down-regulating the full force of the suction source to the pressure set on the PDU, each PDU was retested after all the measurements outlined above were obtained. For each of the pressure settings a PDU was capable of (— 10 cm H2O, — 20 cm H2O, and — 40 cm H2O, as available), the PDU was retested with the wall suction regulator set to full vacuum and the derived PDU pressure measured as outlined above.
For both flow and pressure measurements, two-way analysis of variance (ANOVA) with repeated measures was used. Comparison of data at — 40 cm H2O was made separately from data at — 10 cm H2O and — 20 cm H2O, because only four PDUs offered a — 40 cm H2O suction control level. Post hoc multiple comparison analysis was performed, if appropriate, using a Tukey test. A probability value < 0.05 was considered significant. Comparisons were done between all models at — 10 cm H2O and — 20 cm H2O, as not all PDUs offered a setting of — 40 cm H2O. Pressure accuracy was defined as mean percentage error (deviation from the set value ± SD percentage). canadian family pharmacy

PDC Assessment
Eleven different catheter types were obtained from three major manufacturers (Arrow International [Reading, PA]; Cook [Bloomington, IN]; and Argyle [Sherwood Medical]) for testing (Table 2). The catheters are listed in the order of ascending expected flow rates based on the bore and length of the catheter as described by the Fanning equation. Briefly, the larger the catheter bore and shorter its length the greater the expected flow accommodated (a complete explanation of the Fanning equation is provided in the “Discussion”).
Table 2—PDC Description and Flow Rates

Model Manufacturer Size Description Suction Level, cm H2O
— 10 — 20 — 40
AK-01500 Arrow 8.0F by 16 cm Pneumothorax kit 3.3 ± 0.1 4.9 ± 0.2 7.5 ± 0.1
AK-01000 Arrow 8.0F by 12 cm Pleura-seal thoracentesis kit (three-way stopcock and selfsealing valve) 2.3 ± 0.1 3.4 ± 0.1 5.4 ± 0.1
Argyle Safety Pneumothorax Argyle 8.0F by 10 cm Safety pneumothorax system 3.5 ± 0.1 5.5 ± 0.1 8.1 ± 0.1
Argyle Safety Thoracentesis Argyle 8.0F by 8.5 cm Turkel safety thoracentesis system (catheter with side-port/three-way stopcock and self-sealing valve) 1.5 ± 0.0 2.6 ± 0.0 4.0 ± 0.1
C-TPTS-8.5-7.5-FSNS Cook 8.5F by 7.5 cm Emergency pneumothorax set 4.3 ± 0.1 6.5 ± 0.2 10.0 ± 0.3
C-TPT-100 Cook 9.0F by 29 cm Pneumothorax set 3.8 ± 0.4 6.4 ± 0.5 10.5 ± 0.9
C-UPTP-1400-WAYNE Cook 14.0F by 29 cm Pneumothorax set 8.1 ± 0.1 12.8 ± 0.3 19.7 ± 0.4
AK-01600 Arrow 14.0F by 23 cm Percutaneous cavity drainage catheterization kit (curved catheter with sidearm port) 10.2 ± 0.1 16.8 ± 0.1 25.0 ± 0.2
AK-01601 Arrow 14.0F by 23 cm Percutaneous cavity drainage catheterization kit (straight catheter with sidearm port) 10.3 ± 0.1 16.8 ± 0.1 25.9 ± 0.1
C-TQTS-1600 Cook 16.0F by 41 cm Quick chest tube set 9.3 ± 0.0 14.8 ± 0.6 21.1 ± 0.2
C-TQTS-2400 Cook 24.0F by 41 cm Quick chest tube set 17.5 ± 0.1 28.1 ± 0.1 45.0 ± 0.1