The 15f catheter was received back and it appears to have been sucked flat by suction pressure on the drainage side.It was also badly kinked, and the reinfusion lumen was partially obstructed as well.The white polyurethane catheters are not reinforced and for use with roller pumps only.The instructions for use supplied with that catheter state, "suction: warning: the unreinforced catheter may collapse if suction pressure less than -50 mm hg is applied to the drainage lumen".
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Patient placed on ecmo on (b)(6) 2016.Cannulation went smoothly.Surgeons did not feel the 18f would fit so a 15f was placed.Initial flows were 1.14 with rpms of 3465.Negative pressures -100 (the box used only measures to -100).Volume given to patient and antihypertensives started.Waited for patient to settle and hoped that flows and rpms would correct.Blood pressure came down and there was never really any improvement in rpms or flows.The kink was not discovered until the cannula was removed.Cannula was changed on (b)(6) 2016 to the 18f, reinforced cannula.The same issue occurred and it has collapsed as well.It flattened outside the incision and will need to change it.At this point after 2 cannulas with the same issues, user believes it is something about the patient.Circuit is very clean, no issues with anticoagulation and the 18f should be the correct size for the patient and flows.
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