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Arterial Tonometry

Arterial Tonometry. Preston Broderick, MA University of Pennsylvania. Arterial Tonometry. Non-invasive device used to obtain Pulse Wave Analysis (PWA), Pulse Wave Velocity (PWV) To be performed immediately after the MRI ~30 minute procedure Participant must be laying down

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Arterial Tonometry

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  1. Arterial Tonometry Preston Broderick, MA University of Pennsylvania

  2. Arterial Tonometry • Non-invasive device used to obtain Pulse Wave Analysis (PWA), Pulse Wave Velocity (PWV) • To be performed immediately after the MRI • ~30 minute procedure • Participant must be laying down • Do not include PHI in the database

  3. Arterial Tonometry Adding a subject to the database

  4. Arterial Tonometry • Information that must be entered • ID • First Initial • Last Initial • Year of Birth • Sex

  5. Arterial Tonometry

  6. Arterial Tonometry • Pulse Wave Analysis • Obtain BP measurements using an Omron HEM-907 device • Use that data to calculate the mean arterial pressure with the following equation: • MAP = DBP + 0.4 (SBP-DBP) • Type the sbp in the notes section as “SBP: x” • Indicate which side the radial tonometry is being performed in the notes section • Enter data into PWA subject screen as follows

  7. Arterial Tonometry Pulse Wave Analysis (Radial)

  8. Arterial Tonometry • Data acquisition • Relax your arms and hands • Maintain a constant pressure • Acquire 12 seconds of data • Complete acquisition by pressing the space bar • Goal is to achieve good consistency and height in the waveforms • Shoot for as high an operating index as possible • Ideal target: >90 for radial • Ideal target: >80 for carotid

  9. Arterial Tonometry 12 Seconds of consistent data acquisition

  10. Arterial Tonometry Favorable Result: 94 Operator Index

  11. Arterial Tonometry Unfavorable Result: 0 Operator Index

  12. Arterial Tonometry Pulse Wave Analysis (Carotid)

  13. Arterial Tonometry Pulse Wave Analysis (Carotid)

  14. Arterial Tonometry 12 Seconds of consistent data acquisition

  15. Arterial Tonometry Favorable Result: 95 Operator Index

  16. Arterial Tonometry Unfavorable Result: 5 Operator Index

  17. Arterial Tonometry • Pulse Wave Velocity • Measure distance (mm) between carotid artery and sternal notch • Measure distance (mm) between femoral artery and sternal notch • Shoot for lowest standard deviation possible • Ideal target <10% SD • Place ECG electrodes on subject prior to acquisition

  18. Arterial Tonometry Pulse Wave Velocity

  19. Arterial Tonometry Pulse Wave Velocity (Carotid) 12 Seconds of consistent data acquisition

  20. Arterial Tonometry Pulse Wave Velocity

  21. Arterial Tonometry Pulse Wave Velocity (Femoral) 12 Seconds of consistent data acquisition

  22. Arterial Tonometry Favorable Result: 7% SD

  23. Arterial Tonometry Unfavorable Result: 13% SD

  24. Arterial Tonometry • Exporting data from software • This is the data that will be used for analysis • Export text file after each study visit • Three exports for each visit • PWA Radial • PWA Carotid • PWV • Choose result with highest operator index to export • Keep organized by subject ID, visit number, and result • 001_B_PWAR • 001_B_PWAC • 001_F_PWV

  25. Arterial Tonometry Data Export

  26. Arterial Tonometry Data Export

  27. Arterial Tonometry Data Export

  28. Arterial Tonometry Data Export

  29. Arterial Tonometry • Backing up the database • Imperative in case of data loss • Backup text files as well as database file • Database file located in following location: • C:\Program Files\AtCor\SphygmoCorCvMS\data • Filename: scor.xyz • Simply copy/paste file into a location other than C:\ drive • Backup database as frequently as possible • Rename database file to date it was backed up • Example: scor4008_5-23-2013.xyz

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