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Comparison of Function of Commercially Available Pleural Drainage Units and Catheters: PDU

Comparison of Function of Commercially Available Pleural Drainage Units and Catheters: PDUThe “flow inlet” of RT-200 Calibration Analyzer was kept open to room air to simulate a continuous large bronchopleural fistula. Each PDU was tested for flow rates at suction control settings of — 10 cm H2O, — 20 cm H2O, and — 40 cm H2O (if available), in that order. Five PDUs were tested for each given model. The PDU models were selected in random order. All five units were tested before proceeding to another model. After initiation of the suction, time was allowed to achieve a steady-state level (the digital readout on the RT-200 Calibrator Analyzer remained constant ± 0.01) prior to recording the data. All data were recorded at BTPS. read more

Pressure Measurement: The PDUs were set up as above, except the patient connection tubing of each PDU was connected to the pressure measurement port on the RT-200 Calibrator Analyzer. Each PDU was tested for negative pressure generated at suction control settings as for flow measurements. After initiation of the suction, time was allowed to achieve a steady-state level (the digital readout on the RT-200 Calibrator Analyzer remained constant ± 0.01) prior to recording the data. All data were recorded at BTPS. The accuracy of the device (mean percentage of error) was used for all statistical comparisons of pressures generated by the PDU tested. Accuracy is the standard biomedical instrumentation expression of how well the function of an instrument approaches the true or reference value, in this case the expected delivered negative pressure.
A final test of accuracy of pressure was performed after the above measurements were completed. In all other prior pressure accuracy tests outlined above, the directions of the manufacturer regarding the titration of external suction level (wall suction through a regulator) were closely followed. Many wall suction regulators offer the option of “full vacuum.”