Ventilator Waveforms: Interpretation
Ventilator Waveforms: InterpretationAlbert L. Rafanan, MD, FPCCPPulmonary, Critical Care and Sleep MedicineChong HuaHospital, Cebu CityTypes of Waveforms Scalarsare waveform representations of pressure, flow or volume on the y axis vstime on the x axis Loopsare representations of pressure vsvolume or flow vsvolume Scalar WaveformsLoopCommon problems that can be diagnosedby analyzing Ventilator waveformsAbnormal ventilatoryParameters/lung Overdistension,Auto PEEPCOPDPatient- Ventilator flow starvation,Double triggering,Wasted effortsActive expirationVentilatorycircuit related auto cycling andSecretion build up in theVentilatorycircuitLung Mechanics Use Scalar Pressure Time waveform with a square wave flow patternUnderstanding the basic Ventilator circuit diagramventilatorDiaphragmEssentially the circuit diagram of a mechanically ventilated patient can be broken down into two Ventilator makes up the first part of the circuit. Its pump like action is depicted simplistically as a piston that moves in a reciprocating fashion during the respiratory patient s own respiratory system makes up the 2ndpart of the circuit.
Types of Waveforms •Scalarsare waveform representations of pressure, flow or volume on the y axis vs time on the x axis •Loops are representations of pressure vs volume or flow vs volume
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