Transvalvular pressure gradients for different methods of mitral valve repair: only neochordoplasty achieves native valve gradients

Jahren, Silje Ekroll; Hurni, Samuel; Heinisch, Paul Philipp; Winkler, Bernhard; Obrist, Dominik; Carrel, Thierry; Weber, Alberto (2017). Transvalvular pressure gradients for different methods of mitral valve repair: only neochordoplasty achieves native valve gradients. Interactive cardiovascular and thoracic surgery, 26(2), pp. 248-255. Oxford University Press 10.1093/icvts/ivx323

[img] Text
ivx323.pdf - Published Version
Restricted to registered users only
Available under License Publisher holds Copyright.

Download (1MB) | Request a copy

OBJECTIVES: Many surgical and interventional methods are available to restore patency for patients with degenerative severe mitral valve regurgitation. Leaflet resection and neochordoplasty, which both include ring annuloplasty, are the most frequently performed techniques for the repair of posterior mitral leaflet flail. It is unclear which technique results in the best haemodynamics. In this study, we investigated the effect of different mitral valve reconstruction techniques on mitral valve haemodynamics and diastolic transvalvular pressure gradient in an ex vivo porcine model. METHODS: Eight porcine mitral valves were tested under pulsatile flow conditions in an in vitro pulsatile flow loop for haemodynamic quantification. Severe acute posterior mitral leaflet flail was created by resecting the posterior marginal chorda. The acute mitral valve regurgitation was corrected using 4 different repair techniques, in each valve, in a strictly successive order: (i) neochordoplasty with polytetrafluoroethylene sutures alone and (ii) with ring annuloplasty, (iii) edge-to-edge repair and (iv) triangular leaflet resection, both with ring annuloplasty. Valve haemodynamics were measured and quantified for all valve configurations (native, rupture and each surgical reconstruction). The results were analysed using a validated statistical linear mixed model, and the P-values were calculated using a 2-sided Wald test. RESULTS: All surgical reconstruction techniques were able to sufficiently correct the acute mitral valve regurgitation. Neochordoplasty without ring annuloplasty was the only reconstruction technique that resulted in haemodynamic properties similar to the native mitral valve (P-values from 0.071 to 0.901). The diastolic transvalvular gradient remained within the physiological range for all reconstructions but was significantly higher than in the native valve for neochordoplasty with ring annuloplasty (P < 0.000), edge-to-edge repair (P < 0.000) and leaflet resection (P < 0.000). Neochordoplasty without ring annuloplasty resulted in a significantly better pressure gradient than neochordoplasty with a ring annuloplasty (P < 0.000). Additionally, neochordoplasty with a ring annuloplasty resulted in significantly lower transvalvular pressure gradients than edge-to-edge repair (P < 0.000) and leaflet resection (P < 0.000). CONCLUSIONS: Neochordoplasty with or without ring annuloplasty was the reconstruction technique that almost achieved native physiological haemodynamics after repair of posterior mitral leaflet flail after acute isolated chordal rupture in our ex vivo porcine model.

Item Type:

Journal Article (Original Article)

Division/Institute:

04 Faculty of Medicine > Department of Cardiovascular Disorders (DHGE) > Clinic of Cardiovascular Surgery
10 Strategic Research Centers > ARTORG Center for Biomedical Engineering Research > ARTORG Center - Cardiovascular Engineering (CVE)

Graduate School:

Graduate School for Cellular and Biomedical Sciences (GCB)

UniBE Contributor:

Jahren, Silje Ekroll; Hurni, Samuel; Heinisch, Paul Philipp; Winkler, Bernhard; Obrist, Dominik; Carrel, Thierry and Weber, Alberto

Subjects:

600 Technology > 610 Medicine & health

ISSN:

1569-9293

Publisher:

Oxford University Press

Language:

English

Submitter:

Silje Ekroll Jahren

Date Deposited:

21 Nov 2017 07:30

Last Modified:

07 May 2018 10:58

Publisher DOI:

10.1093/icvts/ivx323

PubMed ID:

29049749

BORIS DOI:

10.7892/boris.105492

URI:

https://boris.unibe.ch/id/eprint/105492

Actions (login required)

Edit item Edit item
Provide Feedback