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find Author "RENRong" 3 results
  • Long-term Echocardiographic Outcomes of Patients after Mitral and Aortic Valve Replacement and their Clinical Significance

    ObjectiveTo investigate long-term echocardiographic outcomes of patients after mitral and aortic valve replacement and their clinical significance. MethodsA total of 204 patients who underwent mitral and aortic valve replacement from January 1999 to June 2008 in West China Hospital of Sichuan University, and had been followed up with echocardiography for longer than 5 years were enrolled in this study. There were 60 male and 144 female patients with their age ranging from 15 to 74 (48.42±11.00)years. Postoperative follow-up time was 5 to 13 (6.34±2.05)years. Preoperative and follow-up echocardiographic results were compared. ResultsCompared with preoperative results, postoperative left atrial diameter (LA)and left ventricular diameter (LV)significantly decreased (P < 0.05), while right ventricular diameter (RV), left ventricular ejection fraction (LVEF)and left ventricular fractional shortening (LVFS)significantly increased (P < 0.05). Right atrial diameter (RA)did not change significantly (P > 0.05). In the patients mainly with mitral stenosis preoperatively, postoperative LA, LV, left atrial area (LAA), left atrial volume (LAV), mitral mean pressure gradient (MPGmv), velocity time integral (VTImv)and pressure half time (PHTmv)significantly decreased (P < 0.05), while mitral effective orifice area (EOAmv)and effective orifice area index (EOAImv)increased significantly (P < 0.05), but peak E velocity (Emv)did not change significantly (P > 0.05). In the patients mainly with mitral regurgitation preoperatively, postoperative LA and LV decreased significantly (P < 0.05), while LAA, LAV, MPGmv, VTImv, PHTmv, EOAmv and EOAImv did not change significantly (P > 0.05). In the patients mainly with aortic stenosis preoperatively, postoperative LV, interventricular septal thickness (IVS), left ventricular mass (LVM), left ventricular mass index (LVMI), aortic peak forward flow velocity(Vav)and mean pressure gradient (MPGav)significantly decreased (P < 0.05), while aortic effective orifice area (EOAav)and effective orifice area index (EOAIav)significantly increased (P < 0.05), but left ventricular posterior wall thickness (LVPW)did not change significantly (P > 0.05). In the patients mainly with aortic regurgitation preoperatively, postoperative LV, LVM, LVMI, EOAav and EOAIav decreased significantly (P < 0.05), while Vav and MPGav increased significantly (P < 0.05), but IVS and LVPW did not change significantly (P > 0.05). In mitral position, compared with patients with 25 mm prosthesis, Emv, MPGmv and VTImv of patients with 27 mm prosthesis were significantly smaller (P < 0.05), but there was no statistical difference in PHTmv, EOAmv or EOAImv between the 2 groups (P > 0.05). In aortic position, compared with patients with 21mm prosthesis, Vav, MPGav and VTIav of patients with 23 mm prosthesis were significantly smaller (P < 0.05), while EOAav and EOAIav were significantly larger (P < 0.05). In mitral position, 38 patients (21.3%)had moderate prothesis-patient mismatch (PPM)and 4 patients (2.3%)had severe PPM. In aortic position, 50 patients (24.5%)had moderate PPM and 43 patients (21.1%)had severe PPM. Consti-tuent ratio of long-term tricuspid regurgitation (TR)degree of patients after tricuspid valvuloplasty (TVP)significantly improved (P < 0.05), but constituent ratio of long-term TR degree of patients without TVP significantly deteriorated (P < 0.05). ConclusionsLeft ventricular function and hemodynamic outcomes in the long term are significantly better than preoperative results after double valve replacement, but they are still far from normal. PPM in aortic position is more severe than that in mitral position. Since residual or aggravated TR is very common in the long term, concomitant TVP should be considered more positively for patients undergoing surgery for left-sided valvular disease.

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  • Initial Evaluation of Reasonableness of Target INR 1.60 to 2.20 and Warfarin Weekly Dosage Adjustment in Patients after Mechanical Heart Valve Replacement

    ObjectiveTo evaluate the reasonableness of anticoagulation management strategy in patients after mechanical heart valve replacement. MethodsAll patients were followed and registered continually at outpatient clinic from July 2011 to February 2013, with a minimum of 6 months after surgery. Targeted international normalized rate (INR) 1.60 to 2.20 and warfarin weekly dosage adjustment were used as the strategy of anticoagulation management. Except bleeding, thrombogenesis and thromboembolism, time in therapeutic range (TTR) and fraction of TTR (FTTR) were adopted to evaluate the quality of anticoagulation management. ResultsA total 1 442 patients and 6 461 INR values were included for data analysis. The patients had a mean age of 48.2±10.6 years (14-80 years) and the following up time were 6 to 180 months (39.2±37.4 months) after surgery. Of these patients, 1 043 (72.3%) was female and 399 (27.7%) was male. INR values varied from 0.90-8.39 (1.85±0.49) and required weekly doses of warfarin were 2.50-61.25 (20.89±6.93 mg). TTR of target INR and acceptable INR were 51.1% (156 640.5 days/306 415.0 days), 64.9% (198 856.0 days/306 415.0 days), respectively. FTTR of target INR and acceptable INR were 49.4% (3 193 times/6 461 times), 62.6% (4 047 times/6 461 times). There were 8 major bleeding events, 7 mild bleeding events, 2 thromboembolism events, and 2 thrombogenesis in the left atrium. ConclusionIt is reasonable to use target INR 1.60-2.20 and warfarin weekly dosage adjustment for patients after mechanical heart valve replacement.

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  • Early evaluation of quality of anticoagulant therapy in patients with mechanical prosthetic valve replacement through TTR and FTTR

    Objective To evaluate the quality of anticoagulant therapy in patients with mechanical prosthetic valve replacement during early period through time in therapeutic range(TTR) and fraction of time in therapeutic range(FTTR), and to provide an objective evidence for further improving quality of anticoagulant therapy. Methods All the patients were followed and registered in hospital and at outpatient clinic from July 2012 through April 2014, with a maximum of 6 months after surgery. Targeted international normalized rate (INR) was 1.60 to 2.20, acceptable INR was 1.50 to 2.30. And warfarin weekly dosage adjustment was used as the strategy of anticoagulation management. Adjusting the warfarin dosage when INR was beyond acceptable INR. Events of bleeding, thrombogenesis and thromboembolism, TTR and FTTR of these patients during the follow-up were collected to evaluate quality of anticoagulant therapy in these patients. Results A total 477 patients and 2 755 reports of INR values were included for data analysis. The follow-up time was 78 918 days. Values of INR varied from 0.92 to 7.72(1.83±0.64). Required weekly doses of warfarin in target INR and acceptable INR were 5.00–35.00(18.15±3.99) mg/week and 5.00–39.38(18.29±4.08) mg/week. TTR of target INR and acceptable INR was 36.85%(27 079.5 d/78 918.0 d) and 49.84% (39 331.5 d/78 918.0 d), respectively. FTTR of target INR and acceptable INR was 37.31% (1 028 times/2 755 times), 50.01% (1 378 times/2 755 times), respectively. TTR of target INR and acceptable INR was 46.04%(3 902.5 d/8 475.5 d), 59.49%(5 042 d/8 475.5 d) when the patients’ follow-up was up to six months and FTTR of target INR and acceptable INR value of these patients was 46.81%(206 times/440 times), 60.45%(266 times/440 times). During the follow-up, there were 3 thromboembolism events, 1 transient physical abnormal activity, and 1 thrombogenesis in the left atrium, and there was no bleeding and death events. Conclusion The strategy of anticoagulation management used in our study is reasonable. In order to further improve the patients’ quality of anticoagulant therapy, it is necessary to start anticoagulation after operation as soon as possible, to strengthen the education of patients with anticoagulant knowledge and to increase INR test frequency properly.

    Release date:2017-01-22 10:15 Export PDF Favorites Scan
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