Wolfgang Bothe1, John Peder Escobar Kvitting2, Manuel K Rausch3, Tomasz A Timek4, Julia C Swanson5, David H Liang6, Mario Walther7, Ellen Kuhl8, Neil B Ingels9, D Craig Miller10. 1. Department of Cardiovascular Surgery, Heart Center Freiburg - Bad Krozingen, Faculty of Medicine, University of Freiburg, Freiburg, Germany; Department of Cardiothoracic Surgery, Stanford University School of Medicine, Stanford, Calif. 2. Department of Cardiothoracic Surgery, Stanford University School of Medicine, Stanford, Calif; Department of Cardiothoracic Surgery, Oslo University Hospital, Rikshospitalet, Oslo, Norway. 3. Aerospace Engineering & Engineering Mechanics, University of Texas at Austin, Austin, Tex. 4. Department of Cardiothoracic Surgery, Stanford University School of Medicine, Stanford, Calif; Division of Cardiothoracic Surgery, Spectrum Health, Grand Rapids, Mich. 5. Department of Cardiothoracic Surgery, Stanford University School of Medicine, Stanford, Calif; Providence Heart and Vascular Institute, Providence St Vincent Hospital, Portland, Ore. 6. Department of Cardiology, Stanford University School of Medicine, Stanford, Calif. 7. Department of Mathematics and Applied Statistics, University of Applied Sciences, Jena, Germany. 8. Department of Cardiothoracic Surgery, Stanford University School of Medicine, Stanford, Calif; Department of Mechanical Engineering, Stanford University School of Engineering, Stanford, Calif. 9. Department of Cardiothoracic Surgery, Stanford University School of Medicine, Stanford, Calif; Laboratory of Cardiovascular Physiology and Biophysics, Research Institute of the Palo Alto Medical Foundation, Palo Alto, Calif. 10. Department of Cardiothoracic Surgery, Stanford University School of Medicine, Stanford, Calif. Electronic address: dcm@stanford.edu.
Abstract
OBJECTIVE: To quantify the effects of annuloplasty rings designed to treat ischemic/functional mitral regurgitation on left ventricular septal-lateral (S-L) and commissure-commissure (C-C) dimensions. METHODS: Radiopaque markers were placed as opposing pairs on the S-L and C-C aspects of the mitral annulus and the basal, equatorial, and apical level of the left ventricle (LV) in 30 sheep. Ten true-sized Carpentier-Edwards Physio (PHY), Edwards IMR ETlogix (ETL), and GeoForm (GEO; all from Edwards Lifesciences, Irvine, Calif) annuloplasty rings were inserted in a releasable fashion. After 90 seconds of left circumflex artery occlusion with the ring implanted (RING), 4-dimensional marker coordinates were obtained using biplane videofluoroscopy. After ring release, another data set was acquired after another 90 seconds of left circumflex artery occlusion (NO RING). S-L and C-C diameters were computed as the distances between the respective marker pairs at end-diastole. Percent change in diameters was calculated between RING versus NO RING as 100 × (diameter in centimeters [RING] - diameter in centimeters [NO RING])/diameter in centimeters [NO RING]). RESULTS: Compared with NO RING, all ring types (PHY, ETL, and GEO) reduced mitral annular S-L dimensions by -20.7 ± 5.6%, -26.8 ± 3.9%, and -34.5 ± 3.8%, respectively. GEO reduced the S-L dimensions of the LV at the basal level only by -2.3 ± 2.4%, whereas all other S-L dimensions of the LV remained unchanged with all 3 rings implanted. PHY, ETL, and GEO reduced mitral annular C-C dimensions by -17.5 ± 4.8%, -19.6 ± 2.5, and -8.3 ± 4.9%, respectively, but none of the rings altered the C-C dimensions of the LV. CONCLUSIONS: Despite radical reduction of mitral annular size, disease-specific ischemic/functional mitral regurgitation annuloplasty rings do not induce relevant changes of left ventricular dimensions in the acutely ischemic ovine heart.
OBJECTIVE: To quantify the effects of annuloplasty rings designed to treat ischemic/functional mitral regurgitation on left ventricular septal-lateral (S-L) and commissure-commissure (C-C) dimensions. METHODS: Radiopaque markers were placed as opposing pairs on the S-L and C-C aspects of the mitral annulus and the basal, equatorial, and apical level of the left ventricle (LV) in 30 sheep. Ten true-sized Carpentier-Edwards Physio (PHY), Edwards IMR ETlogix (ETL), and GeoForm (GEO; all from Edwards Lifesciences, Irvine, Calif) annuloplasty rings were inserted in a releasable fashion. After 90 seconds of left circumflex artery occlusion with the ring implanted (RING), 4-dimensional marker coordinates were obtained using biplane videofluoroscopy. After ring release, another data set was acquired after another 90 seconds of left circumflex artery occlusion (NO RING). S-L and C-C diameters were computed as the distances between the respective marker pairs at end-diastole. Percent change in diameters was calculated between RING versus NO RING as 100 × (diameter in centimeters [RING] - diameter in centimeters [NO RING])/diameter in centimeters [NO RING]). RESULTS: Compared with NO RING, all ring types (PHY, ETL, and GEO) reduced mitral annular S-L dimensions by -20.7 ± 5.6%, -26.8 ± 3.9%, and -34.5 ± 3.8%, respectively. GEO reduced the S-L dimensions of the LV at the basal level only by -2.3 ± 2.4%, whereas all other S-L dimensions of the LV remained unchanged with all 3 rings implanted. PHY, ETL, and GEO reduced mitral annular C-C dimensions by -17.5 ± 4.8%, -19.6 ± 2.5, and -8.3 ± 4.9%, respectively, but none of the rings altered the C-C dimensions of the LV. CONCLUSIONS: Despite radical reduction of mitral annular size, disease-specific ischemic/functional mitral regurgitation annuloplasty rings do not induce relevant changes of left ventricular dimensions in the acutely ischemic ovine heart.
Authors: William D Meador; Mrudang Mathur; Gabriella P Sugerman; Tomasz Jazwiec; Marcin Malinowski; Matthew R Bersi; Tomasz A Timek; Manuel K Rausch Journal: Acta Biomater Date: 2019-11-22 Impact factor: 8.947
Authors: Tomasz A Timek; Marcin Malinowski; Robert L Hooker; Jessica L Parker; Charles L Willekes; Edward T Murphy; Theodore Boeve; Stephane Leung; Justin S Fanning; John C Heiser Journal: Ann Cardiothorac Surg Date: 2021-01
Authors: Mattia Vinciguerra; Francesco Grigioni; Silvia Romiti; Giovanni Benfari; David Rose; Cristiano Spadaccio; Sara Cimino; Antonio De Bellis; Ernesto Greco Journal: Biomedicines Date: 2021-04-21