Early and late results of left ventricular reshaping by passive cardiac-support device in @entity235 XXXX .

@entity235 @entity384 @entity712 @entity5707
BACKGROUND: We tested whether the CardioClasp, a passive non-blood-contacting device could decrease excessive geometric burden in @entity384 and improve left ventricular systolic function and contractility by reshaping the left ventricle (LV) and by decreasing @entity5707 ( @entity5707 ) without decreasing arterial blood pressure. METHODS: In mongrel @entity235 (n = 6, the early group; n = 6, the chronic group; 25-27 kg), 4 weeks of rapid right ventricular pacing (210 to 240 bpm) induced @entity384 with @entity712 . In the early group, we used hemodynamic data and echocardiography to evaluate LV systolic function immediately after placing the CardioClasp device. In the chronic group, we also evaluated LV systolic function immediately after placing the device on dilated hearts and then left the device in place for 30 days. At the end of 30 days, before explantation of the device, we again assessed LV systolic function. We measured fractional area of contraction (FAC), @entity5707 , and hemodynamic data in both groups. RESULTS: In the early group, use of the CardioClasp device decreased the LV end-diastolic anterior-to-posterior dimension by 27.8% +/- 2.6% at implantation (p < 0.05). In the chronic group, use of the CardioClasp decreased the LV end-diastolic anterior-to-posterior dimension by 19.4% +/- 2.0% at implantation (p < 0.05) and by 22.0% +/- 3.10% at explantation (p < 0.05). Use of the CardioClasp did not alter LV end-diastolic and peak pressure, LV dP/dts, or cardiac output at implantation or at explantation. In the early group, use of the CardioClasp decreased the @entity5707 by 43.4% +/- 3.1% at implantation (p < 0.05). In the chronic group, @entity5707 decreased by 28.8% +/- 2.1% at implantation (p < 0.05) and by 43.3% +/- 5.2% at explantation (p < 0.05). In the early group, FAC increased significantly, by 28.9% +/- 7.8% at implantation (p < 0.05). In the chronic group, FAC increased significantly, by 18% +/- 12% at implantation (p < 0.05) and by 19% +/- 12% at explantation (p < 0.05). CONCLUSIONS: As expected, use of the CardioClasp device increased FAC and decreased @entity5707 by reshaping the LV. Use of the CardioClasp device maintained cardiac output and arterial pressure. In 30-day experiments, the increased FAC and decreased @entity5707 were maintained at explantation.
