Material Properties of CorCap Passive Cardiac Support Device

Chitsaz, Sam; Wenk, Jonathan F.; Ge, Liang; Wisneski, Andrew D.; Mookhoek, Aart; Ratcliffe, Mark B.; Guccione, Julius M.; Tseng, Elaine

doi:10.1016/j.athoracsur.2012.07.036

Cited by 9 publications

(10 citation statements)

References 27 publications

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“…We recently derived a material property law sufficient to describe the Acorn CSD fabric and measured material constants in silicone embedded fabric samples with a biaxial stretcher [14]. Those findings were implemented into LS-DYNA using the material routine *MAT_091 [8].…”

Section: Methodsmentioning

confidence: 99%

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Biventricular Finite Element Modeling of the Acorn CorCap Cardiac Support Device on a Failing Heart

Wenk

Zhang

et al. 2013

The Annals of Thoracic Surgery

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Background The Acorn CorCap Cardiac Support Device (CSD; Acorn Cardiovascular Inc, St. Paul, MN) is a woven polyester jacket that is placed around the heart and designed to reverse the progressive remodeling associated with dilated cardiomyopathy. However, the effects of the Acorn CSD on myofiber stress and ventricular function remain unknown. We tested the hypothesis that the Acorn CSD reduces end-diastolic (ED) myofiber stress. Methods A previously described weakly coupled biventricular finite element (FE) model and circulatory model based on magnetic resonance images of a dog with dilated cardiomyopathy was used. Virtual applications of the CSD alone (Acorn), CSD with rotated fabric fiber orientation (rotated), CSD with 5% prestretch (tight), and CSD wrapped only around the left ventricle (LV; LV-only) were performed, and the effect on myofiber stress at ED and pump function was calculated. Results The Acorn CSD has a large effect on ED myofiber stress in the LV free wall, with reductions of 55%, 79%, 92%, and 40% in the Acorn, rotated, tight, and LV-only cases, respectively. However, there is a tradeoff in which the Acorn CSD reduces stroke volume at LV end-diastolic pressure of 8 mm Hg by 23%, 25%, 30%, and 7%, respectively, in the Acorn, rotated, tight, and LV-only cases. Conclusions The Acorn CSD significantly reduces ED myofiber stress. However, CSD wrapped only around the LV was the only case with minimal negative effect on pump function. Findings suggest that LV-only CSD and Acorn fabric orientation should be optimized to allow maximal myofiber stress reduction with minimal reduction in pump function.

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Section: Methodsmentioning

confidence: 99%

“…In a recent study, we embedded the fabric in a silicone matrix and then performed mechanical testing to estimate the fabric material properties [5]. It is worth noting that the Paracor HeartNet Device (Paracor Medical Inc, Sunnyvale, CA) fabric is also an open-cell mesh and significantly anisotropic, similar to the Acorn CSD [6].…”

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confidence: 99%

Biventricular Finite Element Modeling of the Acorn CorCap Cardiac Support Device on a Failing Heart

Wenk

Zhang

et al. 2013

The Annals of Thoracic Surgery

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“…In 2007, cardiovascular diseases represented the third cause of hospitalizations for the Unified Health System, with Heart Failure being the most frequent cause of hospitalization, which is a worldwide public health problem (11)(12) .…”

Section: Introductionmentioning

confidence: 99%

Early readmission in a high complexity public hospital in cardiology

2017

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Objective: to evaluate the early readmission of patients in a high complexity public hospital in cardiology. Methods: this is a descriptive, documental and retrospective study, carried out in a public hospital. Results: in 2012, 729 of the 9,218 hospitalized patients were readmitted, 47.9% of them were readmitted within 30 days after discharge, 61% were men, with a mean age of 57 years old, with the main medical diagnosis of heart disease (heart failure, treatment of acute coronary syndrome, among others) on admission (44.7%) and readmission (45.8%). Most were readmitted for the same medical reason that led to their first hospitalization. Conclusion: considering the profile of the population admitted and readmitted to the institution, it is believed that the rate of readmission is mainly due to the profile of the patients, considering the high prevalence of non-communicable chronic diseases, and coronary artery disease considered unapproachable for percutaneous or surgical when hospitalized. Descriptors: Patient Readmission; Nursing; Hospitalization; Length of Stay. Objetivo: avaliar a readmissão precoce de pacientes em hospital público de alta complexidade em cardiologia. Métodos: estudo descritivo, documental e retrospectivo, realizado em instituição pública hospitalar. Resultados: dos 9.218 pacientes internados, em 2012, 729 foram readmitidos, destes, 47,9% reinternaram dentro de 30 dias após a alta hospitalar, sendo 61% homens, idade média de 57 anos, tendo o principal diagnóstico médico de doenças cardíacas (insuficiência cardíaca, tratamento de síndrome coronariana aguda, entre outros) na admissão (44,7%) e na readmissão (45,8%). A maioria foi readmitida pela mesma razão médica que motivou a primeira hospitalização. Conclusão: em consideração ao perfil da população admitida e readmitida na instituição, acredita-se que a taxa de readmissões se deve, principalmente, ao perfil dos pacientes, ponderando a alta prevalência de doenças crônicas não transmissíveis, e doença arterial coronariana considerada inabordável para tratamento percutâneo ou cirúrgico na admissão. Descritores: Readmissão do Paciente; Enfermagem; Hospitalização; Tempo de Internação.

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“…The ACORN Corcap (Acorn Cardiovascular Inc, St Paul, MN) is a biventricular wrapping, polyester‐mesh cardiac support device designed to prevent left ventricular remodeling introduced in the ACORN trial from 2003 to 2004 (Figure ) . Here, we present the first image report of a patient who underwent successful left ventricular assist device (LVAD) implantation and subsequent heart transplantation with prior Corcap device placement.…”

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confidence: 99%