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What’s Your “Shear Stress”?

Want to Know More?

Relax & Read ⤵️ #Tweetorial by @CoronaryDoc + @arnavkumar

⚡️Coronary Wall Shear Stress in 12 Tweets ⚡️

1/12
Main Readings:
1) interventions.onlinejacc.org/content/early/…
2) ow.ly/XmD130mc9X8
3) link.springer.com/article/10.100…
#ACCImaging @ACCCardioEd
2/12
Wall shear stress (#WSS) is the frictional force of blood exerted tangential to endothelial surface of vessel wall & expressed in variety of units (1Pa=1N/m2=10 dynes/cm2)

It is derived from
• luminal geometry
• flow rate
• blood viscosity
• near wall velocity values
3/12
In vivo WSS calculations are derived from computational fluid dynamic (#CFD) simulations created from reconstructed 3D vessel geometries (from biplane angio/IVUS/OCT/CT/MR) combined with patient-specific pulsatile inlet/outlet velocity values (Doppler wire or other methods)
Read 12 tweets
1/10 #STEMI from ruptured plaque, less plaque erosion. @BraunwaldEugene pic demonstrates LDL oxidized, glycated➡️cytokines release express adhesion molecules➡️monocytes roll, diapedesis➡️ingest LDL, become foam cell➡️SMC migrate, proliferate➡️some apoptosis➡️plaque
2/10 Why #STEMI on #ECG
1. Diastolic current of injury: current away from relatively depolarized injury➡️TQ depression➡️normalized on ECG➡️ST elevation
2. Systolic current of injury: current towards injury due to early repol➡️ST elevation
Read 19 tweets

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