Heart failure & cardiomyopathies
Conduit Flow Compensates for Impaired Left Atrial Passive and Booster Functions in Advanced Diastolic Dysfunction
Authors' conclusion
An increase in conduit volume contribution to stroke volume represents a compensatory mechanism to maintain LV filling in advanced diastolic dysfunction. The increase in conduit volume despite increasing LV diastolic pressures is accomplished by an increase in pulmonary venous pressure.
Study context
- Population
- Consecutive patients undergoing multiphasic cardiac CT, across the spectrum of left ventricular (LV) diastolic dysfunction; validation in severe ASvalidation cohort n=110 (severe AS)
- Participants
- 489 patients
- Outcome
- Left atrial (LA) conduit function (passive emptying, booster and conduit volumes) and its contribution to LV filling
Methodological detailsconsecutive patients, multiphasic cardiac CT, prospective validation cohort
- Consecutive patients
- Multiphasic cardiac CT
- Prospective validation cohort
Main finding
As reported in the abstract
- Early passive filling progressively decreased with worsening diastolic function
- P<0.001
- Atrial booster contribution to stroke volume increased with impaired relaxation
- P=0.021
- Atrial booster contribution declined with more advanced diastolic dysfunction
- P<0.001
- Conduit volume increased progressively
- P<0.001
- Conduit contribution to stroke volume with restrictive filling pattern (IQR 63-81%)
- 75%
- Maximal conduit flow rate correlated with mitral E-wave velocity (r=0.71)
- P<0.0001
Further findings
Validation cohort (severe AS)
- Similar results in patients with severe AS
Original publication
Conduit Flow Compensates for Impaired Left Atrial Passive and Booster Functions in Advanced Diastolic Dysfunction. Circ Cardiovasc Imaging. Published 8 May 2024. doi:10.
Composed by AI from the published abstract and checked against it. How Briefs are made →