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🇳🇴Asbjørn Støylen🇩🇰

@strain-rate.bsky.social
776 followers 208 following 108 posts

Professor emeritus of cardiovascular physiology at NTNU, Trondheim. Academic tweets now on bluesky. Myocardial imaging / mechanics. #EchoSky #CardioSky #MedSky
folk.ntnu.no/stoylen/strainrate 

Other interests: #Birds Nature, environment, history

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🇳🇴Asbjørn Støylen🇩🇰 @strain-rate.bsky.social · 14/12/2025
#Cardiosky #Echosky Basal shortening during IVR isn't "wasted work", the simultaneous stretching the apical part sets up a pressure gradient/volume displacement, creating an apical momentum facilitating flow during early filling
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🇳🇴Asbjørn Støylen🇩🇰 @strain-rate.bsky.social · 14/12/2025
Which means body side is a confounder for GMW
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🇳🇴Asbjørn Støylen🇩🇰 @strain-rate.bsky.social · 13/12/2025
#Cardiosky #Echosky Do strain - pressure loops measure myocardial stroke work? No.  SW = mean ventricular SBP - mean ventricular DBP x SV. GLS do not correlate with SV across a normal population.  Why?  SV increases with body (and heart) size. GLS decreases with body (and heart) size.
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🇳🇴Asbjørn Støylen🇩🇰 @strain-rate.bsky.social · 11/12/2025
LA reservoir strain (LARS) is NOT a measure of atrial compliance (distensibility) as atrial distension is due to LV contraction, not pressure, hence the proxy for LA pressure / LARS is NOT a measure of LA stiffness.
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Reposted by 🇳🇴Asbjørn Støylen🇩🇰
🇳🇴Asbjørn Støylen🇩🇰 @strain-rate.bsky.social · 10/05/2025
#Cardiosky #Echosky The north wind is just as cold blowing from the front or the back. AV-plane motion does not change interpretation when seen from the atrium or the ventricle. And what is the physiological meaning of MAPSE relative to atrial size??? On LA strain during ventricular systole.
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Reposted by 🇳🇴Asbjørn Støylen🇩🇰
🇳🇴Asbjørn Støylen🇩🇰 @strain-rate.bsky.social · 23/05/2025
#Cardiosky Atrial contraction strain. Numerator is AV-plane motion during atrial systole, expressing volume injected into the ventricle (i.e. the A wave). Denominator is atrial length, but as volume is partly a function of ventricular EDP, ventricular compliance is a confounder.
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Reposted by 🇳🇴Asbjørn Støylen🇩🇰
Victoria Delgado @victoriadelgadomd.bsky.social · 14/12/2024
2024 was a blast in cardiovascular imaging congresses led by EACVI. Be ready for #EACVI2025: 📍Vienna 📅11-13 Dcember 👨‍👩‍👦‍👦#EuroeEcho, #EuroCMR and #ICNC-CT together Help us to shape the programme and be part of it 👉https://escardio.formstack.com/forms/eacvi_2025_call_for_sessions #cardiosky
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🇳🇴Asbjørn Støylen🇩🇰 @strain-rate.bsky.social · 13/06/2025
#Cardiosky Contractility cannot be measured by cardial imaging; all imaging measures shortening (=volume reduction), which is load dependent. Myocardial contraction is not shortening, during systole there is both contraction without shortening, and shortening without contraction.
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Reposted by 🇳🇴Asbjørn Støylen🇩🇰
🇳🇴Asbjørn Støylen🇩🇰 @strain-rate.bsky.social · 26/07/2025
#Cardiosky Regional strain pressure loops. Do they add information to regional strain? (Spoiler alert: they don't)
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Reposted by 🇳🇴Asbjørn Støylen🇩🇰
🇳🇴Asbjørn Støylen🇩🇰 @strain-rate.bsky.social · 09/06/2025
#Cardiosky. Being both pre-and afterload dependent, myocardial stroke work is not a contractility measure. As GLS do not correlate with SV, Strain pressure loops do not measure stroke work.
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Reposted by 🇳🇴Asbjørn Støylen🇩🇰
🇳🇴Asbjørn Støylen🇩🇰 @strain-rate.bsky.social · 27/06/2025
#EchoSky Nine uncomfortable facts about Global longitudinal left ventricular strain.
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🇳🇴Asbjørn Støylen🇩🇰 @strain-rate.bsky.social · 05/12/2025
#Cardiosky 1: “Longitudinal strain” is not the real longitudinal shortening, as it adds the effect of inward tracking. 2: The inward gradient of longitudinal strain is an artefact of feature tracking.
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🇳🇴Asbjørn Støylen🇩🇰 @strain-rate.bsky.social · 18/10/2025
US anti-vax stance to blame for continent-wide surge in measles, say experts
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🇳🇴Asbjørn Støylen🇩🇰 @strain-rate.bsky.social · 29/09/2025
Aurora over Trondheim tonight
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🇳🇴Asbjørn Støylen🇩🇰 @strain-rate.bsky.social · 25/09/2025
#Cardiosky. Blood speckle tracking. No longer only visualisation. Validation of quantitative intraventricular pressure gradient measurement. Congratulation. academic.oup.com/ehjcimaging/...
academic.oup.com
Intraventricular pressure difference estimation based on blood speckle tracking—invasive validation and early clinical application
AbstractAims. Ventricular relaxation creates an intraventricular pressure difference (IVPD) and resultant diastolic suction. Non-invasive estimation by ech
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🇳🇴Asbjørn Støylen🇩🇰 @strain-rate.bsky.social · 22/08/2025
Winter is coming
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🇳🇴Asbjørn Støylen🇩🇰 @strain-rate.bsky.social · 05/08/2025
Not sure I would accept the validity of physiology derived partly from a circular reference
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🇳🇴Asbjørn Støylen🇩🇰 @strain-rate.bsky.social · 04/08/2025
#Cardiosky Attempt to estimate LA pressure from echo. The formula uses among other measures tau, non invasive estimated from among other IVRT. But IVRT depends both on tau and LAP. How is that for circular reasoning? doi.org/10.1093/ehjc...
doi.org
Imaging-based method to quantify left ventricular diastolic pressures
AbstractAims. To establish an imaging-based method to quantify left ventricular (LV) diastolic pressures.Methods and results. In 115 patients suspected of
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🇳🇴Asbjørn Støylen🇩🇰 @strain-rate.bsky.social · 26/07/2025
#Cardiosky Regional strain pressure loops. Do they add information to regional strain? (Spoiler alert: they don't)
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🇳🇴Asbjørn Støylen🇩🇰 @strain-rate.bsky.social · 12/07/2025
#Cardiosky Fractional longitudinal LV shortening. An alternative to LV GLS
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🇳🇴Asbjørn Støylen🇩🇰 @strain-rate.bsky.social · 27/06/2025
#EchoSky Nine uncomfortable facts about Global longitudinal left ventricular strain.
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🇳🇴Asbjørn Støylen🇩🇰 @strain-rate.bsky.social · 13/06/2025
#Cardiosky Contractility cannot be measured by cardial imaging; all imaging measures shortening (=volume reduction), which is load dependent. Myocardial contraction is not shortening, during systole there is both contraction without shortening, and shortening without contraction.
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🇳🇴Asbjørn Støylen🇩🇰 @strain-rate.bsky.social · 11/06/2025
Since BSA don't change, I'd suppose it will follow MAPSE very closely, thus reflecting SV, but I can't see any advantage over MAPSE.
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🇳🇴Asbjørn Støylen🇩🇰 @strain-rate.bsky.social · 09/06/2025
#Cardiosky. Being both pre-and afterload dependent, myocardial stroke work is not a contractility measure. As GLS do not correlate with SV, Strain pressure loops do not measure stroke work.
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🇳🇴Asbjørn Støylen🇩🇰 @strain-rate.bsky.social · 02/06/2025
#Cardiosky When has normal EF been equivalent to normal LV function?!??
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🇳🇴Asbjørn Støylen🇩🇰 @strain-rate.bsky.social · 23/05/2025
#Cardiosky Atrial contraction strain. Numerator is AV-plane motion during atrial systole, expressing volume injected into the ventricle (i.e. the A wave). Denominator is atrial length, but as volume is partly a function of ventricular EDP, ventricular compliance is a confounder.
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🇳🇴Asbjørn Støylen🇩🇰 @strain-rate.bsky.social · 16/05/2025
#Cardiosky Atria fills during ventricular ejection and early ventricular diastole. In ventr. ejection, atria expand by apical AV-plane motion driven by ventricular shortening. In early diastole, atria fill by ventricular transverse recoil/expansion, as the atria are compressed longitudinally.
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🇳🇴Asbjørn Støylen🇩🇰 @strain-rate.bsky.social · 12/05/2025
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🇳🇴Asbjørn Støylen🇩🇰 @strain-rate.bsky.social · 10/05/2025
#Cardiosky #Echosky The north wind is just as cold blowing from the front or the back. AV-plane motion does not change interpretation when seen from the atrium or the ventricle. And what is the physiological meaning of MAPSE relative to atrial size??? On LA strain during ventricular systole.
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🇳🇴Asbjørn Støylen🇩🇰 @strain-rate.bsky.social · 17/04/2025
The Aurora exploded over Trondheim tonight
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🇳🇴Asbjørn Støylen🇩🇰 @strain-rate.bsky.social · 05/04/2025
#Cardiosky #Echosky Atrial filling and emptying is related to ventricular systolic and diastolic ventricular function, as volume changes are mainly a function of AV-plane motion within a relatively unchanged outer heart contour
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🇳🇴Asbjørn Støylen🇩🇰 @strain-rate.bsky.social · 20/03/2025
#Cardiosky #Echosky I have collected some recent posters from Bluesky / Twitter and some diagrams from the strain rate website in a compendium on Left ventricular mechanics. It can bee downloaded (free) as *.pdf. from the strain rate front page. stoylen.folk.ntnu.no/strainrate/
stoylen.folk.ntnu.no
Animations will still be in *.GIF format, so they will run on web browsers, and can be embedded in presentations. Pictures and animations are still free to use, with due credit. Strain and strain rate are the concepts of myocardial deformation. My basic views are still that
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🇳🇴Asbjørn Støylen🇩🇰 @strain-rate.bsky.social · 13/03/2025
#Cardiosky #Echosky LV ejection is a complex interaction between LV contraction - relaxation, flow acceleration - deceleration and artery - ventricular coupling.
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🇳🇴Asbjørn Støylen🇩🇰 @strain-rate.bsky.social · 08/03/2025
#Cardiosky #Echosky Pre ejection velocity -occurs before MVC, and is not isovolumic. -is true ventricular contraction, not atrial recoil -is the true LV electromechanical activation timepoint. -peak pre ejection velocity or acceleration is not an LV contractility measure
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🇳🇴Asbjørn Støylen🇩🇰 @strain-rate.bsky.social · 05/03/2025
#Cardiosky #Echosky Late filling is the atrial systole, driven by the atrial pressure increase, propagated into the LV as pulse propagation, seen as a deformation wave from base to apex.
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🇳🇴Asbjørn Støylen🇩🇰 @strain-rate.bsky.social · 02/03/2025
Thank you very much.
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Reposted by 🇳🇴Asbjørn Støylen🇩🇰
Josephine Kavanagh @ourhaus.bsky.social · 02/03/2025
bsky.app/profile/ourh...
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🇳🇴Asbjørn Støylen🇩🇰 @strain-rate.bsky.social · 25/02/2025
Pseudodyskinesia looks all kormal in longitudinal strain, se example here: stoylen.folk.ntnu.no/strainrate/B...
stoylen.folk.ntnu.no
In the physiological aspects, as these were largely overlapping anyway.There will be discussions of validity on composite measures, these will be based almost solely on physiological principles.
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🇳🇴Asbjørn Støylen🇩🇰 @strain-rate.bsky.social · 24/02/2025
#Cardiosky #Echosky MAPSE and GLS are sensitive to both HFpEF and HFrEF. GLS is confounded by BSA, MAPSE is not, both are age dependent. EF is insensitive to HFpEF, but BSA and age. independent. All are load dependent.
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🇳🇴Asbjørn Støylen🇩🇰 @strain-rate.bsky.social · 23/02/2025
-or could it be the opposite, coffe later in the day is more dangerous?...
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🇳🇴Asbjørn Støylen🇩🇰 @strain-rate.bsky.social · 22/02/2025
#Cardiosky #Echosky MAPSE generates a constant % of SV. MAPSE is sex independent, and near near body size independent. MAPSE correlates with SV and EF. GLS (numerical) decreases with increasing body size, and is higher in women. GLS correlates with EF, but not with SV, so GLS based GMW is not valid.
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Reposted by 🇳🇴Asbjørn Støylen🇩🇰
Kardioklick @kardioklick.bsky.social · 05/02/2025
Over at the other site somebody is boasting to have saved a life but stenting a proximal Cx in an asymptomatic patient (big yellow arrows underscore the success!) I think it could be argued that this patient was actually harmed, given the never-ending 2% annual event rate of any PCI. #cardiosky
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🇳🇴Asbjørn Støylen🇩🇰 @strain-rate.bsky.social · 04/02/2025
#Cardiosky
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🇳🇴Asbjørn Støylen🇩🇰 @strain-rate.bsky.social · 03/02/2025
Diastasis is the interval between heart cycles, not between early and late filling of a single heart cycle, thus EA fusion of increasing HR. Early filling releases elastic energy from previous systolic compression, atrial systole stretches the ventricles before following systole. Vortex is conserved
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🇳🇴Asbjørn Støylen🇩🇰 @strain-rate.bsky.social · 28/01/2025
The problem is how diastolic function is defined, if it is from echo, no measure is perfect.
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🇳🇴Asbjørn Støylen🇩🇰 @strain-rate.bsky.social · 28/01/2025
Diastolic function has three components: relaxation, recoil, and filling pressure. All diastolic echo measures are composites, so there are ample possible confounders. Not sure I've seen documentation that really holds. And HFrEF is defined by EF. Athlete's heart is another confounder.
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🇳🇴Asbjørn Støylen🇩🇰 @strain-rate.bsky.social · 23/01/2025
#Cardiosky
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🇳🇴Asbjørn Støylen🇩🇰 @strain-rate.bsky.social · 23/01/2025
Early filling is LV recoil during last part of relaxation, while LV pressure⬇️ . AV plane motion generates vorticity starting at the base, the filling phase propagates from base to apex as a wave of wall deformation and flow velocity propagation and later vortex expansion.
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🇳🇴Asbjørn Støylen🇩🇰 @strain-rate.bsky.social · 20/01/2025
Agreed for the "increased mortality part, I see it mainly as another negative study of Betablockers in stable IHD with normal EF. Most negative studies can be criticised for either methods or study design. I'm still awaiting the ASTAMI results.
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🇳🇴Asbjørn Støylen🇩🇰 @strain-rate.bsky.social · 20/01/2025
📌
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