Lightnews — Scholar-powered news

🇳🇴Asbjørn Støylen🇩🇰

@strain-rate.bsky.social

760 followers 210 following 100 posts

Professor emeritus of cardiovascular physiology at NTNU, Trondheim. Academic tweets now on bluesky. Myocardial imaging / mechanics. #EchoSky #CardioSky #MedSky https://folk.ntnu.no/stoylen/strainrate/   Other interests: #Birds Nature, environment, history

folk.ntnu.no

Posts Media Videos Starter Packs

🇳🇴Asbjørn Støylen🇩🇰 @strain-rate.bsky.social · 12d

Aurora over Trondheim tonight

1 2

🇳🇴Asbjørn Støylen🇩🇰 @strain-rate.bsky.social · 16d

#Cardiosky. Blood speckle tracking. No longer only visualisation. Validation of quantitative intraventricular pressure gradient measurement. Congratulation. academic.oup.com/ehjcimaging/...

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

academic.oup.com

1 3

🇳🇴Asbjørn Støylen🇩🇰 @strain-rate.bsky.social · Aug 22

Winter is coming

🇳🇴Asbjørn Støylen🇩🇰 @strain-rate.bsky.social · Aug 5

Not sure I would accept the validity of physiology derived partly from a circular reference

🇳🇴Asbjørn Støylen🇩🇰 @strain-rate.bsky.social · Aug 4

#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...

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

doi.org

1 1 2

🇳🇴Asbjørn Støylen🇩🇰 @strain-rate.bsky.social · Jul 26

#Cardiosky Regional strain pressure loops. Do they add information to regional strain? (Spoiler alert: they don't)

🇳🇴Asbjørn Støylen🇩🇰 @strain-rate.bsky.social · Jul 12

#Cardiosky Fractional longitudinal LV shortening.
An alternative to LV GLS

3 6

🇳🇴Asbjørn Støylen🇩🇰 @strain-rate.bsky.social · Jun 27

#EchoSky Nine uncomfortable facts about Global longitudinal left ventricular strain.

2 6

🇳🇴Asbjørn Støylen🇩🇰 @strain-rate.bsky.social · Jun 13

#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.

2 2

🇳🇴Asbjørn Støylen🇩🇰 @strain-rate.bsky.social · Jun 11

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.

🇳🇴Asbjørn Støylen🇩🇰 @strain-rate.bsky.social · Jun 9

#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.

1 2 5

🇳🇴Asbjørn Støylen🇩🇰 @strain-rate.bsky.social · Jun 2

#Cardiosky When has normal EF been equivalent to normal LV function?!??

American Society of Echocardiography @ase360.bsky.social · Jun 2

Heart failure with preserved ejection fraction is a heterogeneous entity including different phenotypes of near normal, normal, and supernormal left ventricular function.

The aim of this study was to assess the value of resting LV elastance using TTE to identify HFpEF phenotypes. bit.ly/4kLUJc4

🇳🇴Asbjørn Støylen🇩🇰 @strain-rate.bsky.social · May 23

#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.

1 4

🇳🇴Asbjørn Støylen🇩🇰 @strain-rate.bsky.social · May 16

#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.

🇳🇴Asbjørn Støylen🇩🇰 @strain-rate.bsky.social · May 12

🇳🇴Asbjørn Støylen🇩🇰 @strain-rate.bsky.social · May 10

#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.

1 2

🇳🇴Asbjørn Støylen🇩🇰 @strain-rate.bsky.social · Apr 17

The Aurora exploded over Trondheim tonight

🇳🇴Asbjørn Støylen🇩🇰 @strain-rate.bsky.social · Apr 5

#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

4 6

🇳🇴Asbjørn Støylen🇩🇰 @strain-rate.bsky.social · Mar 20

#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/

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

stoylen.folk.ntnu.no

3 4

🇳🇴Asbjørn Støylen🇩🇰 @strain-rate.bsky.social · Mar 13

#Cardiosky #Echosky LV ejection is a complex interaction between LV contraction - relaxation, flow acceleration - deceleration and artery - ventricular coupling.

3 13

🇳🇴Asbjørn Støylen🇩🇰 @strain-rate.bsky.social · Mar 8

#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

1 3

🇳🇴Asbjørn Støylen🇩🇰 @strain-rate.bsky.social · Mar 5

#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.

2 5

🇳🇴Asbjørn Støylen🇩🇰 @strain-rate.bsky.social · Mar 2

Thank you very much.

Reposted by 🇳🇴Asbjørn Støylen🇩🇰

Josephine Kavanagh @ourhaus.bsky.social · Mar 2

bsky.app/profile/ourh...

Josephine Kavanagh @ourhaus.bsky.social · Mar 2

For those affected - these are good resources to know about. Apologies if you've already been sent this by me.
europepmc.org covers all PubMed records and more. ebi.ac.uk for big biological data sets especially genomic data. These are not housed in USA.

Europe PMCHome - Europe PMC

Europe PMC is an archive of life sciences journal literature.

europepmc.org

1 1 2

🇳🇴Asbjørn Støylen🇩🇰 @strain-rate.bsky.social · Feb 25

Pseudodyskinesia looks all kormal in longitudinal strain, se example here: stoylen.folk.ntnu.no/strainrate/B...

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.

stoylen.folk.ntnu.no