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Myocardial Protection in High-Risk Cardiopulmonary Bypass Support

The development of cardioplegia has facilitated complex cardiac surgery and allowed high-risk patients to safely tolerate life-saving procedures. By following the principles of electromechanical arrest, inducing hypothermia, and using adjunctive agents to help mitigate the effects of hypothermia and ischemia reperfusion injury, cardioplegia can be safely induced with various commercially available compositions, which can be delivered by several different surgical techniques. Although many studies have compared these methods, there is little consensus on whether any one method is superior to another. Just as a surgeon may need to modify technique according to individual patient factors, so too must a surgeon be flexible and be prepared to use different cardioplegia strategies according to the clinical circumstances. Increasing evidence shows the advantage of coronary artery bypass grafting (CABG) over percutaneous interventions in patients with low ejection fractions. Thus, optimal myocardial protection will continue to be necessary in this higher-risk cohort. Moreover, while patients in cardiogenic shock rarely present for CABG, the high mortality in this cohort demonstrates the need for ongoing efforts to improve myocardial protection. Lastly, there may be circumstances in which alternative approaches involving fibrillatory arrest or keeping the heart beating are more effective than conventional cardioplegia. These techniques should all be part of the surgeon’s armamentarium, enabling the surgeon to tailor the operation to the individual patient.

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Role of Midodrine on Vasopressor Duration in Patients with Sepsis

Existing literature evaluating the off-label use of midodrine has focused primarily on postoperative hypotensive patients requiring a single vasopressor. This study aimed to evaluate the impact of midodrine on vasopressor duration and length of stay in patients receiving vasopressors for sepsis-related hypotension. This is an institutional review board-approved, single-center, retrospective analysis of critically ill patients with hypotension secondary to sepsis who received midodrine and intravenous vasopressors compared to those who received intravenous vasopressors alone. Patients were matched by Acute Physiology and Chronic Health Evaluation II score, suspected source of infection, and presence of bacteremia. One hundred patients were included in this analysis. The median duration of vasopressors in the midodrine group (n = 50) was 36 hours (interquartile range [IQR] 18.94-61.94) compared to 26 hours (IQR 13.75-59.88) in the vasopressor-only group (P = .127). Patients in the midodrine group were in the intensive care unit (ICU) for a median of 3.9 days compared to 2.6 days in the vasopressor-only group (P = .017). Midodrine patients had a median hospital length of stay 3.7 days longer than the vasopressor-only group (P = .008). Eight patients (16%) were discharged on midodrine without an indication for therapy. This report assesses the use of midodrine in patients with sepsis requiring one or more vasopressors. Initiation of midodrine did not decrease the time to vasopressor discontinuation. The evaluation of midodrine indication and potential for its discontinuation is an intervention pharmacists can target at the transition of care from the ICU.

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Extracorpor acorporeal Membr eal Membrane Oxy ane Oxygenation Ther genation Therapy in CO y in COVID-19 Patients with Acute Respir atients with Acute Respiratory Distr y Distress Syndr ess Syndrome

Patients with coronavirus disease of 2019 (COVID-19) may present with a wide range of symptoms ranging from asymptomatic to critically ill. Approximately 10-14% of patients require hospitalization. Those individuals requiring hospitalization can deteriorate rapidly with worsening hypoxemia or new-onset pneumonia, resulting in 20-30% of patients developing acute respiratory distress syndrome (ARDS). When refractory to medical management, severe ARDS secondary to other illnesses has been successfully treated with extracorporeal membrane oxygenation (ECMO). We completed a comprehensive literature review of ECMO utilization for patients with severe COVID-19 who were unresponsive to critical care management. Of the 1419 patients with a reported diagnosis of COVID-19-related ARDS requiring ECMO therapy, 53.6% were discharged alive, 8.4% remained on ECMO in the intensive care unit, and 43.0% are deceased. These results are similar to the discharge rate of 60% for patients with non-COVID-related ARDS treated with ECMO. Data reported by the Extracorporeal Life Support Organization notes that 49% of patients with COVID-19 ARDS were discharged alive, 38% of whom were discharged home or to a long-term facility, and 11% were discharged to another hospital. In summary, using ECMO to treat patients with severe ARDS unresponsive to critical care management yields similar results in both non-COVID and COVID-related ARDS.

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