Real-time adjustment of ventricular restraint therapy in heart failure.

Real-time adjustment of ventricular restraint therapy in heart failure.
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心力衰竭心室约束治疗的实时调整。

DOI:
10.1016/j.ejcts.2008.07.013
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发表时间:
2008
期刊:
European journal of cardio-thoracic surgery : official journal of the European Association for Cardio-thoracic Surgery
影响因子:
--
通讯作者:
Chen,FrederickY
Chen,FrederickY
中科院分区:
--
文献类型:
--
作者:
Ghanta,RaviK;Lee,LawrenceS;Umakanthan,Ramanan;Laurence,RitaG;Fox,JohnA;Bolman3rd,RalphMorton;Cohn,LawrenceH;Chen,FrederickY

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目的:当前的心室约束装置不允许测量或调整心室约束水平。装置植入后定期调整约束水平可以提高治疗效果。我们评估了可调节定量心室约束 (QVR) 技术的可行性,该技术利用充满液体的聚氨酯心外膜球囊在生理参数的指导下测量和调整植入后的约束水平。方法:将 QVR 球囊植入 9 只患有梗死后扩张性心力衰竭的绵羊体内。约束水平由舒张末期球囊施加到心外膜的最大约束压力来定义。接入线将球囊内腔连接至皮下门导管以允许经皮接入。调整约束水平,同时通过同步经胸超声心动图评估左心室(LV)舒张末期容积(EDV)和心输出量。结果:所有九只绵羊均成功进行了 QVR 球囊植入。植入后,可以经皮实时测量约束水平,并通过从球囊腔中滴注和抽出液体来动态调整。使用同步超声心动图,可以根据 LV EDV 和心输出量调整约束水平。 QVR 治疗 21 天后,LV EDV 从 133 ± 15 ml 降至 113 ± 17 ml (p < 0.05)。结论:QVR 允许在装置植入后对心室约束治疗进行实时测量和生理调整。
Objective: Current ventricular restraint devices do not allow for either the measurement or adjustment of ventricular restraint level. Periodic adjustment of restraint level post-device implantation may improve therapeutic efficacy. We evaluated the feasibility of an adjustable quantitative ventricular restraint (QVR) technique utilizing a fluid-filled polyurethane epicardial balloon to measure and adjust restraint level post-implantation guided by physiologic parameters.Methods:QVR balloons were implanted in nine ovine with post-infarction dilated heart failure. Restraint level was defined by the maximum restraint pressure applied by the balloon to the epicardium at end-diastole. An access line connected the balloon lumen to a subcutaneous portacath to allow percutaneous access. Restraint level was adjusted while left ventricular (LV) end-diastolic volume (EDV) and cardiac output was assessed with simultaneous transthoracic echocardiography.Results:All nine ovine successfully underwent QVR balloon implantation. Post-implantation, restraint level could be measured percutaneously in real-time and dynamically adjusted by instillation and withdrawal of fluid from the balloon lumen. Using simultaneous echocardiography, restraint level could be adjusted based on LV EDV and cardiac output. After QVR therapy for 21 days, LV EDV decreased from 133 ± 15 ml to 113 ± 17 ml (p< 0.05).Conclusion:QVR permits real-time measurement and physiologic adjustment of ventricular restraint therapy after device implantation.
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