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Personne :
Bertrand, Olivier

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Bertrand

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Olivier

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Université Laval. Faculté de médecine

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ncf11860491

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  • PublicationRestreint
    Feasibility and initial results of percutaneous aortic valve implantation including selection of the transfemoral or transapical approach in patients with severe aortic stenosis
    (Elsevier, 2008-11-01) Bertrand, Olivier; Dumont, Éric; Villeneuve, Jacques; De Larochellière, Robert; Rodés-Cabau, Josep; Doyle, Daniel; Bergeron, Sébastien; Lemieux, Jerome; Pibarot, Philippe; Clavel, Marie-Annick; Raby, Kathlee
  • PublicationRestreint
    Comparison of the hemodynamic performance of percutaneous and surgical bioprostheses for the treatment of severe aortic stenosis
    (Elsevier Biomedical, 2009-05-19) Bertrand, Olivier; Webb, John G. (John Graydon); Rodés-Cabau, Josep; Bergeron, Sébastien; Altwegg, Lukas; Pibarot, Philippe; Dumont, Éric; Clavel, Marie-Annick; Thompson, Chris; De Larochellière, Robert; Doyle, Daniel; Masson, Jean-Bernard
    Objectives : This study was undertaken to compare the hemodynamic performance of a percutaneous bioprosthesis to that of surgically implanted (stented and stentless) bioprostheses for the treatment of severe aortic stenosis. Methods : Fifty patients who underwent percutaneous aortic valve implantation (PAVI) with the Cribier-Edwards or Edwards SAPIEN bioprosthetic valve (Edwards Lifesciences, Inc., Irvine, California) were matched 1:1 for sex, aortic annulus diameter, left ventricular ejection fraction, body surface area, and body mass index, with 2 groups of 50 patients who underwent surgical aortic valve replacement (SAVR) with a stented valve (Edwards Perimount Magna [SAVR-ST group]), or a stentless valve (Medtronic Freestyle, Medtronic, Minneapolis, Minnesota [SAVR-SL group]). Doppler echocardiographic data were prospectively obtained before the intervention, at discharge, and at 6- to 12-month follow-up. Results : Mean transprosthetic gradient at discharge was lower (p < 0.001) in the PAVI group (10 ± 4 mm Hg) compared with the SAVR-ST (13 ± 5 mm Hg) and SAVR-SL (14 ± 6 mm Hg) groups. Aortic regurgitation (AR) occurred more frequently in the PAVI group (mild: 42%, moderate: 8%) compared with the SAVR-ST (mild: 10%, moderate: 0%) and SAVR-SL (mild: 12%, moderate: 0%) groups (p < 0.0001). At follow-up, the mean gradient in the PAVI group remained lower (p < 0.001) than that of the SAVR-ST group, but was similar to that of the SAVR-SL group. The incidence of severe prosthesis-patient mismatch was significantly lower (p = 0.007) in the PAVI group (6%) compared with the SAVR-ST (28%) and SAVR-SL (20%) groups. However, the incidence of AR remained higher (p < 0.0001) in the PAVI group compared with the 2 other groups. Conclusions : PAVI provided superior hemodynamic performance compared with the surgical bioprostheses in terms of transprosthetic gradient and prevention of severe prosthesis-patient mismatch, but was associated with a higher incidence of AR.
  • PublicationRestreint
    Acute kidney injury following transcatheter aortic valve implantation : predictive factors, prognostic value, and comparison with surgical aortic valve replacement
    (European Society of Cardiology, 2009-12-27) Bertrand, Olivier; Webb, John G. (John Graydon); Dumont, Éric; Nietlispach, Fabian; De Larochellière, Robert; Rodés-Cabau, Josep; Bagur, Rodrigo Hernan; Doyle, Daniel; Masson, Jean-Bernard; Pibarot, Philippe; Gutiérrez-Marcos, José; Clavel, Marie-Annick
    Aims: Very few data exist on the occurrence of acute kidney injury (AKI) associated with transcatheter aortic valve implantation (TAVI). The objectives of the present study were (i) to determine the incidence, predictive factors, and prognostic value of AKI following TAVI, and (ii) to compare the occurrence of AKI in TAVI vs. surgical aortic valve replacement (SAVR) in patients with pre-procedural chronic kidney disease (CKD). Methods and results: A total of 213 patients (mean age 82 ± 8 years) undergoing TAVI for the treatment of severe aortic stenosis were included in the study. Acute kidney injury was defined as a reduction of >25% in estimated glomerular filtration rate (eGFR) within 48 h following the procedure or the need for haemodialysis during index hospitalization. Those patients with pre-procedural CKD (eGFR <60 mL/min/1.73 m2, n = 119) were compared with 104 contemporary patients with CKD who underwent isolated SAVR. The incidence of AKI following TAVI was 11.7%, with 1.4% of the patients requiring haemodialysis. Predictive factors of AKI were hypertension (OR: 4.66; 95% CI: 1.04–20.87), chronic obstructive pulmonary disease (OR: 2.64, 95% CI: 1.10–6.36), and peri-operative blood transfusion (OR: 3.47, 95% CI: 1.30–9.29). Twenty-one patients (9.8%) died during index hospitalization, and the logistic EuroSCORE (OR: 1.03 for each increase of 1%; 95% CI: 1.01–1.06) and occurrence of AKI (OR: 4.14, 95% CI: 1.42–12.13) were identified as independent predictors of postoperative mortality. Patients with CKD who underwent TAVI were older, had a higher logistic EuroSCORE and lower pre-procedural eGFR values compared with those who underwent SAVR (P < 0.0001 for all). The incidence of AKI was lower (P = 0.001; P = 0.014 after propensity score adjustment) in CKD patients who underwent TAVI (9.2%, need for haemodialysis: 2.5%) compared with those who underwent SAVR (25.9%, need for haemodialysis: 8.7%). Conclusion: Acute kidney injury occurred in 11.7% of the patients following TAVI and was associated with a greater than four-fold increase in the risk of postoperative mortality. Hypertension, chronic obstructive pulmonary disease, and blood transfusion were predictive factors of AKI. In those patients with pre-procedural CKD, TAVI was associated with a significant reduction of AKI compared with SAVR.
  • PublicationRestreint
    Exercise capacity in patients with severe symptomatic aortic stenosis before and six months after transcatheter aortic valve implantation
    (Elsevier, 2011-07-15) Bertrand, Olivier; Dumont, Éric; De Larochellière, Robert; Côté, Mélanie; Rodés-Cabau, Josep; Bagur, Rodrigo Hernan; Doyle, Daniel; Poirier, Paul; Pibarot, Philippe
    Few data exist on the use of the 6-minute walk test (6MWT) to measure the exercise capacity of patients with severe symptomatic aortic stenosis considered at very high surgical risk. The objectives of the present prospective study were (1) to determine the feasibility and safety of the 6MWT as a measure of exercise capacity before and after transcatheter aortic valve implantation (TAVI), and (2) to determine the clinical and hemodynamic parameters associated with the exercise capacity changes in such patients. A total of 64 patients (age 80 ± 8 years, logistic European System for Cardiac Operative Risk Evaluation score 21 ± 15%, Society of Thoracic Surgeons' score 7.5 ± 3.9%) who had undergone successful TAVI were included. The 6MWT was performed within the month before TAVI and at the 6-month follow-up visit. The mean distance walked increased from 165.3 ± 79.7 to 231.7 ± 88.9 m (p <0.0001); however, up to 25% of the patients did not improve or even decreased their exercise capacity. After adjustment for the baseline distance walked, multilinear regression analysis showed that a greater degree of renal dysfunction, as evaluated by the serum creatinine levels (r(2) = 0.05, p = 0.03), lower postprocedural hemoglobin values (r(2) = 0.13, p = 0.0012), and a longer hospitalization length (r(2) = 0.08, p = 0.007) were associated with lower improvement in exercise capacity. In conclusion, exercise capacity, as evaluated by the 6MWT, was very poor in patients with severe symptomatic aortic stenosis considered at very high surgical risk. TAVI was associated with a significant increase in exercise capacity, although no improvement was observed in 1/4 of the patients. A greater degree in renal dysfunction, lower postprocedural hemoglobin values, and longer hospitalization stay were predictors of lower improvement in exercise capacity after TAVI. These results suggest that the 6MWT might become an important tool as a part of the evaluation process for TAVI candidates.
  • PublicationRestreint
    Images in cardiovascular medicine: transapical aortic valve implantation in a patient with severe aortic stenosis and Pott disease
    (American Heart Association, 2009-10-20) Bertrand, Olivier; Lemieux, Jérôme; Dumont, Éric; De Larochellière, Robert; Gingras, Luc; Rodés-Cabau, Josep; Bergeron, Sébastien; Bagur, Rodrigo Hernan; Doyle, Daniel; Pibarot, Philippe