Inflation
Onset of diastole just after the closure of the aortic valve
Deflation
Onset of systole during isovolumetric contraction
Trigger
Timings
Use & Limitations
ECG
Inflation: Middle of the T wave
Deflation: Peak of the R wave
Deflation: Peak of the R wave
Requires good ECG trace. May not be suitable if arrythmia present
Arterial Pressure Waveform
Inflation: At the dicrotic notch
Deflation: Just before the systolic upstroke
Deflation: Just before the systolic upstroke
Requires the balloon pump to accurately sense ventricular systole and diastole
Asynchronous / Internal
Timings based upon pacing spikes depending upon mode
Requires patient to be 100% paced. Should not be used for on demand pacing
Pacing Device
Asynchronous augmentation based on a set rate (40-120/min)
Rarely used except in cases of cardiac arrest