acrin cv committee arterial tonometry preston broderick, ma university of pennsylvania

ACRIN CV Committee

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 TonometryAdding 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 TonometryPulse Wave Analysis (Radial)

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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

Arterial Tonometry

ACRIN CV Committee

Arterial Tonometry

12 Seconds of consistent data acquisition

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Arterial TonometryFavorable Result: 94 Operator Index

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Arterial TonometryUnfavorable Result: 0 Operator Index

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Arterial TonometryPulse Wave Analysis (Carotid)

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Arterial TonometryPulse Wave Analysis (Carotid)

ACRIN CV Committee

Arterial Tonometry

12 Seconds of consistent data acquisition

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Arterial TonometryFavorable Result: 95 Operator Index

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Arterial TonometryUnfavorable 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 TonometryPulse Wave Velocity

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Arterial TonometryPulse Wave Velocity (Carotid)

12 Seconds of consistent data acquisition

ACRIN CV Committee

Arterial TonometryPulse Wave Velocity

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Arterial TonometryPulse Wave Velocity (Femoral)

12 Seconds of consistent data acquisition

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Arterial TonometryFavorable Result: 7% SD

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Arterial TonometryUnfavorable Result: 13% SD

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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

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Data Export

Arterial Tonometry

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Arterial TonometryData Export

ACRIN CV Committee

Arterial TonometryData Export

ACRIN CV Committee

Arterial TonometryData 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