Arterial Tonometry
Preston Broderick, MA
University of Pennsylvania
ACRIN CV Committee
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
ACRIN CV Committee
Arterial Tonometry
Adding a subject to the database
ACRIN CV Committee
Arterial Tonometry
 Information that must be entered
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ID
First Initial
Last Initial
Year of Birth
Sex
ACRIN CV Committee
Arterial Tonometry
ACRIN CV Committee
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
ACRIN CV Committee
Arterial Tonometry
Pulse Wave Analysis (Radial)
ACRIN CV Committee
Arterial Tonometry
 Data acquisition
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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
ACRIN CV Committee
Arterial Tonometry
12 Seconds of consistent data acquisition
ACRIN CV Committee
Arterial Tonometry
Favorable Result: 94 Operator Index
ACRIN CV Committee
Arterial Tonometry
Unfavorable Result: 0 Operator Index
ACRIN CV Committee
Arterial Tonometry
Pulse Wave Analysis (Carotid)
ACRIN CV Committee
Arterial Tonometry
Pulse Wave Analysis (Carotid)
ACRIN CV Committee
Arterial Tonometry
12 Seconds of consistent data acquisition
ACRIN CV Committee
Arterial Tonometry
Favorable Result: 95 Operator Index
ACRIN CV Committee
Arterial Tonometry
Unfavorable Result: 5 Operator Index
ACRIN CV Committee
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
ACRIN CV Committee
Arterial Tonometry
Pulse Wave Velocity
ACRIN CV Committee
Arterial Tonometry
Pulse Wave Velocity (Carotid)
12 Seconds of consistent data acquisition
ACRIN CV Committee
Arterial Tonometry
Pulse Wave Velocity
ACRIN CV Committee
Arterial Tonometry
Pulse Wave Velocity (Femoral)
12 Seconds of consistent data acquisition
ACRIN CV Committee
Arterial Tonometry
Favorable Result: 7% SD
ACRIN CV Committee
Arterial Tonometry
Unfavorable Result: 13% SD
ACRIN CV Committee
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
ACRIN CV Committee
Arterial Tonometry
Data Export
ACRIN CV Committee
Arterial Tonometry
Data Export
ACRIN CV Committee
Arterial Tonometry
Data Export
ACRIN CV Committee
Arterial Tonometry
Data Export
ACRIN CV Committee
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\SphygmoCor CvMS\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
ACRIN CV Committee