Publications by authors named "John Iguidbashian"

Background: A novel electronic health records (EHR)-based workflow was implemented at a quaternary referral center to improve the efficiency of inpatient surgical consultation processes for patients requiring trauma or acute care surgery (TACS) consultation.

Methods: The EHR-driven consultation workflow automated notifications, communication of patient information, and data-tracking. Timeliness of care was compared between pre-implementation (1/1/2020-1/31/2022), early post-implementation (2/1/2022-1/31/2023), and late post-implementation (2/1/2023-1/31/2024) cohorts.

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Objective: To develop a reproducible ex vivo heart perfusion (EVHP) and murine heart transplantation model and to evaluate the efficacy of hypothermic, acellular ex vivo perfusion with sphingosine-1-phosphate (S1P) as a strategy to mitigate transplantation-associated ischemia-reperfusion injury (IRI).

Methods: Donor hearts from wild-type mice were stratified by preservation technique. Group 1 hearts (n = 4) served as nontransplanted controls.

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The organ-level molecular response to cardiac surgery with cardiopulmonary bypass (CPB) remains inadequately understood and may be heterogeneous. Here, we measured organ-specific gene expression in a piglet model of CPB with deep hypothermic circulatory arrest (DHCA). Infant piglets underwent peripheral CPB with 75 min of DHCA and 6 h of critical care after separation from CPB.

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Aims: There is wide variability in the practice of cardiac preservation for heart transplantation. Prior reports suggest that the type of solution may be linked with a reduced incidence of posttransplantation complications.

Methods: Adult (≥18 years old) heart recipients who underwent transplantation between 2015 and 2021 in the United States were examined.

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Background: Aortic arch measurements provide a framework for surgical decision-making in neonatal aortic coarctation, specifically in the determination of approach for arch repair by lateral thoracotomy vs median sternotomy. The purpose of this study was to evaluate our experience with transthoracic echocardiography (TTE) and computed tomography angiography (CTA) in the preoperative evaluation of infants with aortic coarctation, specifically comparing arch dimensions as a function of imaging modality.

Methods: Imaging data were reviewed for all infants undergoing surgical repair of aortic coarctation at our institution from 2012 to 2022.

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Article Synopsis
  • This study investigates how travel time to heart transplantation centers affects healthcare accessibility and survival outcomes for patients.
  • It analyzed over 25,000 adult heart transplant recipients in the U.S. from 2012 to 2022, revealing that longer travel times were linked to poorer long-term survival, especially for white recipients.
  • The findings indicate that addressing long travel times could enhance healthcare accessibility and improve survival rates among heart transplant patients.
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Background: Inefficient clinical workflows can have downstream effects of increased costs, poor resource utilization, and worse patient outcomes. The surgical consultation process can be complex with unclear communication, potentially delaying care for patients requiring time-sensitive intervention in an acute setting. A novel electronic health records (EHR)-based workflow was implemented to improve the consultation process.

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Many end-stage kidney failure patients require hemodialysis as a life-sustaining treatment. Hemodialysis access via arteriovenous fistula or graft creation is preferred over long-term dialysis catheters, but intervention to maintain patency and prevent access failure is common. Endovascular and open surgical techniques are both utilized to address the underlying etiology of failure.

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  • * Researchers analyzed data from adult heart transplant recipients between 2012 and 2021, categorizing them based on their SVI into lower (<75%) and higher (≥75%) vulnerability groups.
  • * Results showed that while one-year survival rates were similar, five-year survival was significantly lower for individuals in vulnerable communities (74.8% vs 80.0%), and these individuals also faced higher rates of hospital readmission and graft rejection, highlighting a need for targeted support for these patients.
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Increasing the number of available hearts for transplantation is the best strategy to decrease waitlist mortality. This study examines organ procurement organizations (OPOs) and their role in the transplantation network to determine whether variability in performance exists across them. Adult deceased donors who met the criteria for brain death between 2010 and 2020 (inclusive) in the United States were examined.

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Lung transplantation survival estimates are traditionally reported as fixed 1-, 5-, and 10-year mortality rates. Alternatively, this study aims to demonstrate how conditional survival models can provide useful prognostic information tailored to the time a recipient has already survived from the date of transplantation. Recipient data was obtained from the Organ Procurement and Transplantation Network database.

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Introduction: Calcific aortic valve disease (CAVD) is a slowly progressive fibro-calcific valve leaflet disorder. The underlying pathophysiology is complex and not yet well understood. Complement is known to play a role in the pathogenesis of CAVD by upregulating Runx2 to induce profibrogenic change in human aortic valve interstitial cells (AVICs).

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Surgical site infections (SSI) following congenital heart surgery (CHS) remain a significant source of morbidity. Delayed sternal closure (DSC) is often required to minimize the potential for hemodynamic instability. The purpose of this study was to determine the incidence of SSI among patients undergoing DSC versus primary chest closure (PCC) and to define a potential inflection point for increased risk of SSI as a function of open chest duration (OCD).

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The intestinal microbiome is essential to human health and homeostasis, and is implicated in the pathophysiology of disease, including congenital heart disease and cardiac surgery. Improving the microbiome and reducing inflammatory metabolites may reduce systemic inflammation following cardiac surgery with cardiopulmonary bypass (CPB) to expedite recovery post-operatively. Limited research exists in this area and identifying animal models that can replicate changes in the human intestinal microbiome after CPB is necessary.

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Acute kidney injury (AKI) is a common cause of morbidity after congenital heart disease surgery. Progress on diagnosis and therapy remains limited, however, in part due to poor mechanistic understanding and a lack of relevant translational models. Metabolomic approaches could help identify novel mechanisms of injury and potential therapeutic targets.

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Article Synopsis
  • Lung transplantation is the primary treatment for end-stage respiratory failure, and this study compared the survival rates of transplant recipients to the general population using a nested case-control design.* -
  • The study analyzed data from 14,977 lung transplant patients and matched them with 74,885 control subjects, finding a 10-year survival rate of only 28% for transplant recipients and notably higher mortality rates, especially among females and Hispanic individuals.* -
  • Despite lung transplant recipients having over five times the mortality risk compared to the general population, the study shows that long-term mortality rates have been gradually improving since the 1990s.*
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  • The study investigated the potential increase in organ donations from donors after circulatory death (DCD), particularly focusing on heart transplants, as DCD heart usage has lagged behind other organs.
  • Researchers analyzed data from 12,813 DCD donors between 2015 and 2020 and found that 3,528 met the criteria for heart donation, resulting in only 70 hearts being transplanted.
  • If DCD heart donation becomes widely accepted, it could add approximately 580 additional heart transplants yearly in the U.S., representing the largest growth in the donor pool in recent heart transplantation history.
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Background: The COVID-19 pandemic has uniquely affected the United States. We hypothesize that transplantation would be uniquely affected.

Methods: In this population-based cohort study, adult transplantation data were examined as time series data.

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  • Methadone has potential benefits for early extubation in pediatric cardiac surgery, but data is limited in this area.
  • A study at a children's hospital analyzed 24 patients who received a multimodal analgesic approach, including methadone, showing high rates of early extubation with minimal adverse effects.
  • Results suggest that a methadone-based regimen can allow for safe early extubation, but further research is necessary to test its effectiveness across diverse patient populations and care teams.
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  • A 61-year-old male with a history of emphysema, obstructive sleep apnea, and hypertension experienced worsening shortness of breath and swelling, leading to an ER visit.
  • He showed symptoms of heart failure, including elevated jugular veins and fluid retention, and tests revealed a significantly reduced left ventricular ejection fraction (LVEF) suggestive of left ventricular non-compaction (LVNC).
  • The patient was treated according to heart failure guidelines, monitored for arrhythmias, and discharged with a wearable defibrillator, with plans for future evaluation for an implantable defibrillator for primary prevention.
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A 23-year-old, previously healthy female presented with lower abdominal pain and mildly elevated creatinine one month following a right ureter stent for non-specific ureteral thickening causing obstruction. On admission, computed tomography (CT) revealed moderate hydronephrosis of the left kidney that would require stent placement as well. During stent placement, it was noted that the gross appearance of the ureters resembled ureteritis cystica.

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A 66-year-old woman presented with 2 days of fever and severe diarrhoea. She has a history of ulcerative colitis (UC), well controlled with medication. She also has a history of Ehlers-Danlos syndrome, infective endocarditis following aortic valve replacement and pulmonary embolism.

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