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