Hi guys,
I'd be grateful for your advice with my research which requires processing of an invasively measured arterial blood pressure trace recorded in cardiology patients undergoing cardiac interventions. I ought to say that I'm a doctor and have minimal bioengineering experience though have completed the core 1 and 2 modules.
To date I have been acquing analogue outputs from a Philips monitoring system via BNC to a cDAQ-9174 module and onto my laptop. I have been using signal express initially to acquire the signals and using the TDMS file to process the data offline in labview.
I am able to acquire the arterial pressure waveform at 500hz frequency in volts and apply a formula to convert to mmHg which are the SI units. My challenge is analysing the waveform to provide a peak and trough pressure for each cardiac cycle which corresponds to the systolic and diastolic blood pressure eg 120/80 mmHg. In addition the heart rate can vary from 40 to 180 beats per minute and so it isn't possible to pre-specify a frequency of the arterial waveform. Ideally I'd like to have a numerical value for the systolic and diastolic pressure with each heart beat ie 60-180 reading per minute dependent on heart rate. I have used a peak detection Vi in LAbview 2011 to detect the waveform peaks (systolic pressure) but can't work out how to detect the corresponding trough which can vary from 20-100mmHg, Is there a slope based trigger/measurement method that woudl be more applicable.
Sorry in advance if my request is a bit light on the engineering content but any thoughts on achieving this measurement would be much appreciated!
Thanks,
Andy
