The cardiohelp hls 7.0 ecmo system manufactured by maquet displayed and sounded an advisory alarm "pressure drop out of range".Upon investigation, it was found that the p(int) pressure sensor was displaying -500mmhg when normally it should be a positive number.P(art), p(ven) and flows were normal and the patient continued to be supported.Due to intermittent advisory alarm, we had to briefly discontinue support and "zero" the sensor.Upon reinitiating support, p(int) was displaying "0", p(art) was displaying 213mmhg and delta p was displaying -213mmhg.We left the upper range for delta p at -180mmhg for clinical intervention and continued support without further events.Fda safety report id# (b)(4).
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