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The Efficacy of Thoratec Implantable Ventricular Assist Devices Compared to Syncardia Total

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The Efficacy of Thoratec Implantable Ventricular Assist Devices Compared to Syncardia Total The Efficacy of Thoratec Implantable Ventricular Assist Devices Compared to Syncardia Total Artificial Hearts as Bridge-to-Transplantation Therapy in Adults with Biventricular Heart Failure Alexandria Davenport Physician Assistant Program Arcadia University Evidence Based Practice October 14, 2019 1 Abstract Introduction: Systolic heart failure is a chronic condition in which there is a decrease in the heart’s ability to pump blood to the body. While there are several treatments for the symptoms of heart failure, the only curative treatment for most causes of chronic heart failure is a heart transplant. Due to the limited number of heart donors, 72.2% of patients in need of a heart transplant in 2017 spent up to 2 years waiting for a transplant. Mechanical circulatory support has been used to increase patient survival to transplantation. In the past, these machines were external devices that limited patients to hospitals while they waited for a transplant. Recently, devices have been created that are implantable, with the purpose of increasing patient’s quality of life by allowing for hospital discharge. Therefore, this review compares the use of Syncardia’s total artificial heart to Thoratec’s implantable ventricular assist device (I) in waitlist survival (O) in adult patients in biventricular systolic heart failure (P). Methods: A literature search was conducted through Google Scholar in November 2018. A total of seven articles consisting of two prospective cohort and five retrospective cohort studies were selected based on publication date, type and brand of ventricular support device used, and sample population. Results: The evidence collected by the three studies directly comparing biventricular assists devices as a whole to Syncardia’s total artificial heart showed no significant difference in survival to transplantation. One of the four supplementary studies independently showed significant survival to transplantation in Thoratec implantable ventricular assist device patients and two studies independently showed significant survival to transplantation in Syncardia total artificial heart patients. Six of the seven total studies showed survival to successful transplantation in the total artificial heart or the implantable ventricular assist device after a year on mechanical circulatory support. Discussion: Of the three studies comparing survival to transplantation between biventricular assist device patients and total artificial heart patients, no significant differences were found. Of the other four articles examining overall survival to transplantation on the total artificial heart and the implantable assist devices, all the studies showed significant positive results. Due to the limited sample sizes and inability to randomize samples, further research on the topic is necessary. Conclusion: In 2017, 3,529 adults in America were on the United Network for Organ Sharing (UNOS) list waiting for a donor heart. Ventricular assist devices are often used to bridge patients with severe heart failure to transplantation. The seven studies selected for review found that there is not a significant difference in waitlist survival between patients with a Syncardia total artificial heart and a Thoratec implantable ventricular assist device. While more research is recommended to create a set of guidelines for biventricular assist device selection, currently the decision is between a patient and their clinical care team. 2 Introduction Systolic heart failure is defined as a decrease in the heart’s ability to pump to due at least one of four determinants: decreased heart rate, decreased contractility of the myocardium, decreased ventricular preload, or increased ventricular afterload.1 According to the 2013 to 2016 National Health and Nutrition Examination Survey (NHANES), it is estimated that 6.2 million Americans have been diagnosed with heart failure.2 The most common cause of systolic heart failure in developed countries (including the United States) is ischemic cardiomyopathy from a previous myocardial infarction (heart attack). Heart failure is classified as left-sided, right-sided, or biventricular, however biventricular failure is more prevalent than single-sided failure. In 2012, the cost of heart failure on the health care system was $30.7 billion. It is estimated that heart failure is the underlying cause of death for 1 in 8 deaths in America. Treatments for heart failure depends on the patient’s ejection fraction (the ratio of the amount of blood pumped out of the heart to the amount of blood in the heart) and severity of symptoms. Symptom severity is categorized in four classes created by the New York Heart Association (NYHA), which are summarized below.3,4 NYHA Class Symptom Severity Class I No symptoms with normal activity Class II Mild symptoms with normal activity Class III Severe symptoms with normal activity, asymptomatic at rest Class IV Symptoms at rest NYHA Class I can be prolonged and NYHA Classes II to IV are often treated pharmacologically. An implantable cardioverter-defibrillator (ICD) may be indicated in patients with a decreased ejection fraction and heart rate. Patients in NYHA Classes III or IV with 3 symptoms refractory to medication and the ICD are candidates for ventricular assist devices (VADs) and/or transplantation.3 For patients who underwent heart transplantation between 2010 and 2012, the 1-year survival was 90.5% and the 5-year survival was 79.1%.5 However, in 2017, 3,529 adults in America were on the United Network for Organ Sharing (UNOS) list waiting for a donor heart, but only 2,811 (79%) transplantations were performed, and 580 people (16%) died while waiting or became too sick to transplant.5 Due to the limited number of heart donors 72.2% of patients in need of a heart transplant in 2017 spent up to 2 years waiting for a transplant.6 Historically, patients with biventricular heart failure would have a left VAD and a right VAD implanted. In 2004, the FDA approved the Thoratec Implantable VAD and the Syncardia Total Artificial Heart (TAH), both for patients with biventricular heart failure.7,8 Both mechanical cardiovascular support options can be used to help patients survive until a donor heart is available. This paper poses the following question: In adults diagnosed with end stage biventricular heart failure (P), is there a difference in the waitlist survival rates (O) between Thoratec IVADs and Syncardia TAHs (I) as a bridge-to-transplant therapy? Methods A literature search was performed in November 2018 in Google Scholar using the terms “‘biventricular’ thoratec ‘IVAD.’” This search was limited to articles published in scholarly journals with publication dates of 2007 or later. This search yielded 263 articles. The articles were then excluded based on the following: 1. Studies that focused on pediatric populations. 2. Case studies 3. Studies focusing only on left or right heart failure. These exclusion criteria narrowed the number of articles to 5. The “cited by” feature was then used, with the basis being 4 the article entitled “Results of a multicenter clinical trial with the Thoratec Implantable Ventricular Assist Device” and a search of the cited articles using the search term “biventricular” resulted in 79 articles. The exclusion criteria were applied, which narrowed the number of articles to 4. The “cited by” feature was used again, based on the previously mentioned article, with the search term “syncardia” that resulted in 27 articles. The previously mentioned exclusion criteria were applied, narrowing the number of articles to 2. Results Fitzpatrick JR, MD, Frederick JR, MD, Hiesinger W, MD, et al. Early planned institution of biventricular mechanical circulatory support results in improved outcomes compared with delayed conversion of a left ventricular assist device to a biventricular assist device. The Journal of Thoracic and Cardiovascular Surgery. 2009;137:971-977. The purpose of this article was to investigate differences in outcome between patients who received a planned BiVAD and patients who receive a BiVAD after right-sided failure on an LVAD. The use of left-sided mechanical circulatory support is a major risk factor for right- sided heart failure, leading to the need for concurrent right-sided support or biventricular support. Not all patients with left ventricular assist devices (LVADs) will develop the need for a right ventricular assist device (RVAD) or a biventricular assist device (BiVAD). Estimating the risk of a patient developing right-sided heart failure will help clinicians choose between implanting a BiVAD or an LVAD. The study was designed in an observational cohort fashion. The inclusion criterion was all patients who received an LVAD implantation at the Hospital of the University of Pennsylvania between April 1995 and June 2007 for a sample size of 99 patients needing biventricular support; 71 planned BiVADs and 28 delayed BiVADs. Data was collected retrospectively, however the groups were defined as P-BiVAD (patients who received a BiVAD as part of their operative plan), D-BiVAD (patients that received a BiVAD after first receiving an 5 LVAD), and patients that only had a LVAD, which acted as a control group. The only statistically significant (p < 0.05) differences between the P-BiVAD and D-BiVAD groups were preoperative heart rate (100.1 ± 21.6 beats/min in the P-BiVAD group and 113.9 ± 22.4 beats/min in the D-BiVAD group; p = 0.0299) and diastolic blood pressure (57.5 ± 12.5 mmHg in the P-BiVAD group and 51.2 ± 10.2 mmHg in the D-BiVAD group;
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