Parallel veno-venous and veno-arterial extracorporeal membrane circuits for coexisting refractory hypoxemia and cardiovascular failure: a case report.

BACKGROUND: The complexity of extracorporeal membrane oxygenation (ECMO) techniques continues to evolve. Different cannulation methods and configurations have been proposed as a response to a challenging cardiovascular and pulmonary physiology of the patients. The use of parallel ECMO circuits represents a unique and novel approach for patients with refractory respiratory failure and cardiovascular collapse with very large body surface areas. CASE PRESENTATION: We present the case of a 25-year-old morbidly obese male patient admitted for severe acute respiratory distress syndrome (ARDS) and refractory hypoxemia, requiring institution of double cannulation for veno-venous ECMO. Since his hypoxemia persisted, likely due to insufficient flows given his large body surface area, an additional drainage venous cannula was implemented to provide higher flows, temporarily addressing his oxygenation status. Unfortunately, the patient developed concomitant cardiogenic shock refractory to inotropic support and extracorporeal fluid removal, further worsening his oxygenation status, thus the decision was to institute four-cannulation/parallel-circuits veno-venous and veno-arterial ECMO, successfully controlling both refractory hypoxemia and cardiogenic shock. CONCLUSIONS: Our case illustrates a novel and complex approach for combined severe ARDS and cardiovascular collapse through the use of parallel veno-venous and veno-arterial ECMO circuits, and exemplifies the expansion of ECMO techniques and its life-saving capabilities when conservative approaches are futile.

Use of venovenous extracorporeal membrane oxygenation for resection of a large paratracheal mass causing critical tracheal stenosis: A case report.

Critical airway stenosis is challenging for surgeons and anesthesiologists to secure a reliable airway for ventilation. The use of venovenous (VV)-extracorporeal membrane oxygenation (ECMO) has been described as a strategy to provide adequate gas exchange in such instances. We present a case of a young female with a complex paratracheal mass significantly compressing the trachea; a planned intraoperative VV-ECMO was instituted to allow safe orotracheal intubation of a double-lumen endotracheal tube for lung isolation and tumor resection.

Cefazolin plus ertapenem and heart transplantation as salvage therapy for refractory LVAD infection due to methicillin-susceptible Staphylococcus aureus: A case series.

The use of left ventricular assist devices (LVADs) is increasingly more common as the availability of donor organs in relation to failing hearts is outstandingly limited. Infections are the most common complications in LVAD recipients, particularly those caused by Staphylococcus spp. Refractory LVAD-related infections are not uncommon as achieving adequate source control is often not feasible before heart transplantation. Evidence suggest that cefazolin plus ertapenem is effective in refractory methicillin-susceptible Staphylococcus aureus (MSSA) bacteremia, but this approach has not been described in LVAD recipients. In this article, we report two cases of refractory MSSA bacteremia in LVAD recipients that were successfully treated with salvage therapy with cefazolin plus ertapenem and subsequent heart transplantation. This treatment strategy should be considered in patients with refractory LVAD-associated infection due to MSSA that are not responding to standard treatment.

Early prediction of transition to durable mechanical circulatory support in patients undergoing peripheral veno-arterial extracorporeal membrane oxygenation for critical cardiogenic shock.

Peripheral veno-arterial extracorporeal membrane oxygenation (pVA-ECMO) has gained increasing value in the management of patients with critical cardiogenic shock (cCS), allowing time for myocardial recovery. Failure of myocardial recovery has life-altering consequences: transition to durable mechanical circulatory support (dMCS), urgent heart transplantation, or withdrawal of support. Clinical factors controlling myocardial recovery under these circumstances remain largely unknown. Using a retrospective cohort, we developed a model for early prediction of transition to dMCS in patients undergoing pVA-ECMO for cCS. To promote myocardial recovery, our clinical management centered around left ventricular pressure unloading, that is, targeting pulmonary capillary wedge pressures (PCWP) ≤18 mm Hg. We collected demographic data, laboratory findings, inotrope use, and two-dimensional transthoracic echocardiography measurements, all limited to the first 72h of pVA-ECMO (D1-3). Out of 70 patients who were alive after pVA-ECMO, 27 patients underwent implantation of dMCS. There was no significant difference in survival to hospital discharge between patients with or without transition to dMCS. Ejection fractionD1-3 (per 10% increase, OR 0.37 [0.17-0.79]) and amount of inotropic supportD1-3 (OR 4.77 [1.6-14.18]) but neither myocardial wall tension nor PCWP emerged as significant predictors of transition to dMCS. Optimism-corrected c-index (0.90 [0.89-0.90]) revealed an excellent discriminative ability of our model. In summary, our model for early prediction of transition to dMCS in patients with cCS undergoing pVA-ECMO identifies indicators of inotropic state as relevant factors. Absence of markers for myocardial oxygen consumption or left ventricular pressure loading allows us to hypothesize sufficient cardiac unloading in our cohort with PCWP-targeted management.

Aorto-pulmonary bypass shunt for intraoperative right ventricular support during LVAD implantation.

We describe a simple modification of the cardiopulmonary bypass (CPB) circuit that allows selective intraoperative circulatory support of the right ventricle during left ventricular assist device (LVAD) implantation. The addition of a side branch to the arterial line and an intermediate line connector allows selective venting and perfusion through a cannula inserted in the main pulmonary artery. This modification of the CPB circuit allows for selective evaluation of right ventricular function, titration of inotropic support, and early identification of patients that require right ventricular assist device (RVAD) support.

"Heart and kidney transplant from donor with recent veno-arterial extracorporeal cardiopulmonary resuscitation".

OBJETIVES: ECMO is progressively being adopted as a last resort to stabilize patients receiving cardiopulmonary resuscitation (ECMO CPR). A significant number of these patients will present recovery of end-organ function, but evolve with brain death, accounting for only 30% of patients discharged from the hospital alive. Harvesting organs from donors on VA ECMO has recently been proposed as a strategy to expand the pool of available organs for transplantation. METHODS: We present a case of combined heart and kidney transplantation from a brain death donor with recent out of hospital cardiac arrest rescued with eCPR. RESULTS: A 31 year old male patient was admitted to local hospital with diagnosis of drowning after seizure episode. Patient received two rounds of CPR for 8 and 30 minutes respectively, and required emergency insertion of VA ECMO. Patient developed compartment syndrome of right lower extremity (RLE) with CPK = 30,720, prompting discontinuation of ECMO support within 48 hours as cardiac function had recovered, reflected on echocardiographic and enzymatic parameters. Patient was declared brain death and became organ donor. Multiple organ procurement was performed. Combined heart and right kidney transplant was then performed on a 61-year-old male with uneventful course, and with normal function of all implanted allografts at 3 months follow up. CONCLUSION: Our experience supports the concept that VA ECMO is not a contraindication for solid organ donation. Individual evaluation of organ function can lead to successful transplantation of multiple organs from donors with recent history of VA ECMO support.

Advanced heart failure therapies in patients with stable HIV infection.

BACKGROUND: Human immunodeficiency virus (HIV) infection affects nearly 38 million people worldwide. Patients living with HIV (PLHIV) on modern highly active antiretroviral therapy face significant morbidity and mortality related to the progression of chronic diseases, which lead to an increase in the burden of end-stage organ disease and organ failure. PLHIV present a two fold increased risk of heart failure as compared with the general population, with a prevalence of clinical heart failure of 6.5 %. Orthotopic heart transplantation (OHT) is rarely performed in HIV-positive patients despite the fact that HIV-associated cardiomyopathy is a major long-term complication of HIV infection. MATERIAL AND METHODS: We present a case of PLHIV presenting with decompensated heart failure, requiring initial therapy with left ventricular assist device, followed by heart transplantation, accompanied by an update on current concepts, and experience in the field. DISCUSSION AND CONCLUSION: HIV-associated cardiomyopathy is a major long-term complication of HIV infection. LVAD support or OHT should also be encouraged among HIV-positive patients as current data indicates that AHFT is safe in carefully selected HIV-positive patients and outcomes are similar to those of HIV-negative patients.

Refractory traumatic bronchopleural fistula: Is extracorporeal membrane oxygenation the new gold standard?

INTRODUCTION: A refractory bronchopleural fistula leading to respiratory failure in a trauma patient is one of the most challenging pathologies to manage in one of the most challenging patient populations. Modern equipment and techniques have decreased and perhaps even eliminated the need for anticoagulation with ECMO, and it is finding an important niche in saving this patient population from refractory hypoxia. We review here our experience with three refractory traumatic bronchopleural fistulae utilizing venovenous ECMO as the primary treatment modality. MATERIAL AND METHODS: Retrospective chart review of three cases of refractory traumatic bronchopleural fistula treated primarily with ECMO and an ultra-lung protective strategy. RESULTS: The use of an ultra-lung protective strategy with ECMO allowed sealing of all three bronchopleural fistula. CONCLUSIONS: Traumatic bronchopleural fistulae require careful thought and early utilization of lung protective strategies to facilitate healing of the injured lung.

Horner's syndrome following single lung transplantation.

Lung transplantation have significantly improved quality of life in patients with end stage respiratory failure, however use of lifelong immunosuppressive therapy and development of bronchiolitis obliterans reflects in a 5-year survival is less the 60%. Ophthalmic complications following lung transplantation are uncommon. Some cases of infectious and malignant ophthalmic complications have been described previously. Here we describe a case of Horner's syndrome following single lung transplantation.

EMPROVING outcomes: Evaluating the effect of an ultralung protective strategy for patients with ARDS treated with ECMO.

OBJECTIVE: Since the initiation of an adult extracorporeal membrane oxygenation (ECMO) program at our institution, the program has managed well over 200 patients with ECMO in a 3-year time frame. While there is a plethora of research evaluating ECMO for acute respiratory distress syndrome (ARDS), few studies have evaluated the impact that ventilator management after cannulation might have on outcomes. We hypothesized that failure to properly protect the lungs after cannulation would lead to higher mortality. MATERIALS AND METHODS: This was a retrospective observational study performed from 1 January 2014 to 8 July 2018. RESULTS: A total of 196 patients were treated with ECMO, 57 of whom were diagnosed with ARDS and treated with venovenous ECMO. The univariable analysis revealed a statistically higher total serum bilirubin and lower total days on ECMO in those who died vs those who lived. During ECMO, higher mean peak inspiratory pressures (PIP) and higher FiO2 were found in those who died vs those who lived. In multivariable analysis, increasing age (odds ratio [OR] = 1.2; confidence interval [CI] = 1.04-1.39, P = .02), increasing mean PIP, and increasing mean FiO2 concentration during ECMO (PIP: OR = 1.40, CI = 1.03-1.89, P = .03; FiO2 : OR = 1.16, CI = 1.02-1.32, P = .02) were all associated with increased mortality. CONCLUSION: Failing to protect the lungs with a lung protective strategy such as the EMPROVE protocol after ECMO cannulation was associated with mortality. For every 1 mm Hg increase in the mean PIP, the odds of dying increased 1.4 times, and for every 1% increase in the mean FiO2 , the odds of dying increased 1.16 times. For lung rest to truly be effective, the lungs must be relieved of the burden of gas exchange.

Long-term outcomes of elderly patients receiving continuous flow left ventricular support.

BACKGROUND: Heart failure is an epidemic affecting over 6 million people in the United States. Eighty percent of all heart failure patients are older than 65 years of age. Heart transplant is the gold standard treatment for patients suffering advanced heart failure, but only 18.5% of patients receiving heart transplant in the United States are 65 years of age or older. Continuous-flow left ventricular assist devices are a safe and effective therapy for patients with advanced heart failure, and can be used to bridge patients to a heart transplant or to support patients long-term as destination therapy. MATERIAL AND METHODS: We sought to characterize long-term outcomes of elderly patients receiving continuous-flow left ventricular support in our program. CONCLUSION: Elderly patients with advanced heart failure presented comparable operative results to those of younger patients. The rate of complications up to 6 years of support was low, and comparable to those of younger patients. An effective and safe alternative for patients whom are less likely to receive heart transplantation.

DCD and DBD lung transplantation optimized by ex vivo perfusion: What to do when the pump fails.

BACKGROUND: Ex vivo perfusion is a safe and feasible method of assessing and using high-risk donor organs. AIM: We describe a case of successfully ex vivo treated and transplanted human lung allografts. METHODS: Donor human lungs were assessed using ex vivo, our trouble shooting protocol allowed safe recovery. RESULTS: We successfully implanted our ex vivo treated organs.

Is it safe to remove an infected cardiac implantable electronic device at the time of heart transplantation? Report of two cases.

Cardiac implantable electronic device (CIED) infections are treated with antibiotics and device explantation. Lack of CIED removal is associated with infection recurrence. However, CIED removal can be associated with major complications including death. We reported two patients with advanced heart disease who developed CIED infection due Staphylococcus epidermidis while awaiting for orthotopic heart transplantation (OHT). Both patients were managed with a different approach. They were treated with antibiotic therapy and had their CIED removal postponed until OHT. Both patients were kept on suppressive antibiotic treatment until undergoing simultaneous OHT and removal of infected CIED. None of the patients had infection recurrence. Large studies are needed to assess whether the approach of delaying CIED removal until OHT is safe among carefully selected patients with CIED infection.

In vivo resuscitation, perfusion, and transplantation of a porcine cardiac allograft donated after circulatory death.

OBJECTIVES: To test the feasibility of a novel method of heart donation under circulatory death criteria that allows precardiectomy donor heart assessment. MATERIALS AND METHODS: This is a translational study utilizing 16 female Yorkshire pigs in a series of eight heart transplant procedures under a circulatory death model. RESULTS: Successful resuscitation of the donor hearts occurred in seven out of eight animals. All seven of these hearts were deemed to have good function and were successfully transplanted. In the animal in which donor heart resuscitation was not successful, the transplant was aborted, and a left ventricular assist device (LVAD) was placed in the recipient's heart. CONCLUSION: This animal study demonstrates the feasibility of using this novel technique for resuscitation and precardiectomy evaluation of donated after circulatory death hearts. For those donor hearts without adequate function, an LVAD can be safely implanted as a "bail-out" option. The limitations of this technique are the patient population to which it can be applied (only those patients eligible and consented for LVAD).

Combined off-pump coronary bypass grafting without heparin and liver transplantation: A novel approach to a complex dilemma.

Cardiac disease is a leading cause of early mortality for patients undergoing liver transplantation (LT), and severe coronary artery disease (CAD) is usually considered a contraindication for LT in patients with cirrhosis. Incidence of CAD in LT candidates has increased in recent years. While stable patients might be candidates for percutaneous interventions, patients with decompensated liver failure, or critical coronary lesions present a therapeutic challenge, and are often not considered candidates for LT. We present the case of a 60 year old male patient with decompensated liver failure, and critical CAD, who received successful combined off-pump coronary bypass grafting without heparin and LT using ex vivo normothermic liver perfusion machine. This approach represents a novel strategy to offer LT to this very selective group of patients.

Central vs peripheral venoarterial ECMO in postcardiotomy cardiogenic shock.

OBJECTIVES: Central or peripheral venoarterial extracorporeal membrane oxygenation (va ECMO) is widely used in postcardiotomy cardiogenic shock (PCS). Available data suggest controversial results for both types. Our aim was to investigate PCS patients treated with either peripheral (pECMO) or central ECMO (cECMO) concerning their outcome. METHODS: Between April 2006 and October 2016, 156 consecutive patients with va ECMO therapy due to PCS were identified and included in this retrospective analysis. Patients were divided into cECMO and pECMO groups. Statistical analysis of risk factors concerning 30-day mortality of the mentioned patient cohort was performed using IBM SPSS Statistics. RESULTS: Fifty-six patients received cECMO and 100 patients were treated with pECMO due to PCS. In the group of cECMO peripheral vascular disease was significantly more present (cECMO 19 [34%] vs pECMO 14 [14%]; P < .01). On-site ECMO complications occurred significantly more frequent in patients treated with cECMO (cECMO 44 [79%] vs pECMO 54 [54%] g/dL; P < 0.01). More often cECMO patients required a second look operation due to mediastinal bleeding (cECMO 52 [93%] vs pECMO 61 [61%] g/dL; P < .01). Thirty-day mortality was comparable with nearly 70% in both cohorts (cECMO 39 [70%] vs pECMO 69 [69%]; P = .93). CONCLUSION: Patients supported by cECMO or pECMO due to refractory PCS did not show significant differences in 30-day mortality, despite a lower incidence of on-site ECMO complications and re-exploration in pECMO patients. PCS itself is associated with high mortality and peripheral cannulation might help to save resources compared with central cannulation.

Rescue therapy for hypercapnia due to high PEEP mechanical ventilation in patients with ARDS and renal failure.

Extracorporeal removal of carbon dioxide in patients experiencing severe hypercapnia due to lung protective mechanical ventilation was first described over four decades ago. There have been many devices developed and described in the interim, many of which require additional training, resources, and staff. This manuscript describes a readily available and relatively simple adjunct that can provide partial lung support in patients with acute respiratory distress syndrome complicated by severe hypercapnia and acute kidney injury requiring dialysis.

Heparineless off-pump coronary artery bypass in a patient with gunshot wound to chest and heart.

OBJECTIVES: Administration of heparin is standard in coronary artery bypass grafting (CABG) with or without cardiopulmonary bypass (OPCABG). In some circumstances, the risk of heparinization may outweigh its benefits, and there is scarce literature on how to proceed in these cases. We describe the technique used for OPCABG without heparin. METHODS: We report the case of a patient with a gunshot wound to the chest resulting in multiple lung lacerations and transection of the proximal left anterior descending coronary artery (LAD) leading to hemorrhagic shock with tamponade, and cardiogenic shock due to myocardial ischemia who received OPCABG without heparin. RESULTS: A 23-year-old patient suffered multiple gunshot wounds to the chest and was admitted in shock with massive left hemothorax. Emergency left thoracotomy revealed multiple lung lacerations and transection of the proximal left anterior coronary artery. The patient presented acute myocardial ischemia and progressed to cardiogenic shock requiring insertion of intra-aortic balloon pump (IABP) to try to support hemodynamics. OPCABG with a segment of reversed saphenous vein graft to the LAD coronary artery was performed using standard techniques but without heparinization. The graft was flushed with normal saline before completing both anastomosis. Myocardial ischemic changes reversed, and the patient stabilized immediately after completing OPCABG, allowing to wean off IABP in the operating room. Postoperative recovery was unremarkable, and the patient was discharged home on postoperative day 9. CONCLUSION: Benefits of OPCABG include decreased bleeding and lower requirement of blood transfusions. This experience shows that OPCABG can be performed without systemic heparinization in selected cases.

Refractory Pulmonary Edema and Upper Body Hypoxemia During Veno-Arterial Extracorporeal Membrane Oxygenation-A Case for Atrial Septostomy.

Veno-arterial extracorporeal membrane oxygenation (VA-ECMO) provides mechanical circulatory support for patients with advanced cardiogenic shock, facilitating myocardial recovery and limiting multi-organ failure. In patients with severely limited left ventricular ejection, peripheral VA-ECMO can further increase left ventricular and left atrial pressures (LAP). Failure to decompress the left heart under these circumstances can result in pulmonary edema and upper body hypoxemia, that is, myocardial and cerebral ischemia. Atrial septostomy can decrease LAP in these situations. However, the effects of atrial septostomy on upper body oxygenation remain unknown. After IRB approval, we identified 9 out of 242 adult VA-ECMO patients between January 2011 and June 2016 who also underwent atrial septostomy for refractory pulmonary edema/upper body hypoxemia. We analyzed LAP/pulmonary capillary wedge pressure (PCWP), right atrial pressures (RAPs), Pa O2 /Fi O2 ratios (blood samples from right radial artery), intrathoracic volume status, and resolution of pulmonary edema before and up to 48 h after septostomy. There were no procedure-related complications. Thirty-day survival was 44%. LAP/PCWP decreased by approximately 40% immediately following septostomy and remained so for at least 24 h. Pa O2 /Fi O2 ratios significantly increased from 0.49 (0.38-2.12) before to 5.35 (3.01-7.69) immediately after septostomy and continued so for 24 h, 6.6 (4.49-10.93). Radiographic measurements also indicated a significant improvement in thoracic intravascular volume status after atrial septostomy. Atrial septostomy reduces LAP and improves upper body oxygenation and intrathoracic vascular volume status in patients developing severe refractory pulmonary edema while undergoing peripheral VA-ECMO. Atrial septostomy therefore appears safe and suitable to reduce the risk of upper body ischemia under these circumstances.

A Weaning Protocol for Venovenous Extracorporeal Membrane Oxygenation With a Review of the Literature.

Several articles have discussed the weaning process for venoarterial extracorporeal membrane oxygenation; however, there is no published report to outline a standardized approach for weaning a patient from venovenous extracorporeal membrane oxygenation (ECMO). This complex process requires an organized approach and a thorough understanding of ventilator management and ECMO physiology. The purpose of this article is to describe the venovenous ECMO weaning protocol used at our institution as well as provide a review of the literature.