Electrodiagnostic findings in patients with non-COVID-19- and COVID-19-related acute respiratory distress syndrome.

BACKGROUND: Critical illness polyneuropathy and myopathy (CIPNM) is a frequent neurological manifestation in patients with acute respiratory distress syndrome (ARDS) from coronavirus disease 2019 (COVID-19) infection. CIPNM diagnosis is usually limited to clinical evaluation. We compared patients with ARDS from COVID-19 and other aetiologies, in whom a neurophysiological evaluation for the detection of CIPNM was performed. The aim was to determine if there were any differences between these two groups in frequency of CINPM and outcome at discharge from the intensive care unit (ICU). MATERIALS AND METHODS: This was a single-centre retrospective study performed on mechanically ventilated patients consecutively admitted (January 2016-June 2020) to the ICU of Careggi Hospital, Florence, Italy, with ARDS of different aetiologies. Neurophysiological evaluation was performed on patients with stable ventilation parameters, but marked widespread hyposthenia (Medical Research Council score <48). Creatine phosphokinase (CPK), lactic dehydrogenase (LDH) and mean morning glycaemic values were collected. RESULTS: From a total of 148 patients, 23 with COVID-19 infection and 21 with ARDS due to other aetiologies, underwent electroneurography/electromyography (ENG/EMG) recording. Incidence of CIPNM was similar in the two groups, 65% (15 of 23) in COVID-19 patients and 71% (15 of 21) in patients affected by ARDS of other aetiologies. At ICU discharge, subjects with CIPNM more frequently required ventilatory support, regardless the aetiology of ARDS. CONCLUSION: ENG/EMG represents a useful tool in the identification of the neuromuscular causes underlying ventilator wean failure and patient stratification. A high incidence of CIPNM, with a similar percentage, has been observed in ARDS patients of all aetiologies.

The prognostic role of peak glycemia and glucose variability in trauma: a single-center investigation.

AIM: Admission hyperglycemia and glucose variability were associated with mortality in critically ill patients, but data on trauma patients are to date scarce and heterogeneous. METHODS: We assessed the prognostic role of ICU death of admission and peak glycemia and glucose variability (indicated by the standard deviation of mean glucose levels and the coefficient of variation of glucose) in 252 patients consecutively admitted for trauma in our ICU (January 1, 2016-December 31, 2018). RESULTS: The in-ICU mortality rate was 17% (43/252). When compared to patients who died during ICU stay, survivors were younger (p = 0.001), more frequently males (p = 0.002), with a lower incidence of hypertension (p = 0.023). Higher values of SAPS II, SOFA and ISS were observed in nonsurvivors (p < 0.001, p < 0.001, p < 0.001, respectively). Survivors exhibited significantly lower values of admission glycemia (p = 0.001), peak glycemia (p = 0.002) and mean glucose values measured during the first 24 h since ICU admission (p = 0.001). Glucose variability was significantly higher in nonsurvivors, as indicated by higher values of SD and CV (p = 0.001 and p = 0.001, respectively). At multivariate regression analysis, admission glycemia (Model 1), peak glycemia (Model 2) and glucose variability (Model 3 and 4) were independent predictors for in-ICU mortality. CONCLUSIONS: Our findings indicate that not only admission glycemia but also peak glycemia and glucose variability show a correlation with in-ICU mortality in trauma patients.

Out of hospital cardiac arrest and uncontrolled donation after circulatory death in a tertiary cardiac arrest center.

OBJECTIVES: Out of hospital cardiac arrest (OHCA) is worldwide quite a common disease, whose mortality still remains high. We aimed at assessing the number of potential donors after OHCA in a tertiary cardiac arrest center with extracorporeal membrane oxygenation (ECPR) and uncontrolled donation after circulatory death (uDCD) programs. METHODS: In our single center, prospective, observational study (June 2016 to December 2018), we included all OHCA consecutive patients aged or less 65 years. RESULTS: Our series included 134 OHCA patients. The percentage of patients with return of spontaneous circulation (ROSC) was 36% (48/134). Among patients with no ROSC, ECPR was implanted in 26 patients (26/86, 30%). Among patients without ROSC, 25 patients were eligible for uDCD (25/86, 29%), while 35 patients died at the emergency department. Among patients with ROSC, 15 patients died (15/48, 31%), among whom seven became donors after brain death (7/15, 49%), a percentage which did not vary during the study period. In the subgroup of the 26 patients treated with ECPR, 24 patients died (24/26, 92%) among whom eight were potential donors (33%, 8/34), and only two patients survived (7.7%, 2/26) though with good neurological outcome. CONCLUSIONS: The implementation of ECPR and uDCD programs in a tertiary cardiac center is feasible and increased the number of donors, because despite organizational and technical challenges, the uDCD donor pool was 62.5% of all potential donors (25/40).

Activities of an ECMO Center for Severe Respiratory Failure: ECMO Retrieval and Beyond, A 4-Year Experience.

OBJECTIVE: Beyond retrieval and management of patients with severe acute respiratory distress syndrome, an extracorporeal membrane oxygenation (ECMO) center also encompasses several other actions, such as on-call consultations, advice, and counseling, to the physicians at the peripheral centers, but few data are available on this topic. Therefore, the authors describe the composite activities of retrieval and counseling of an ECMO center since 2014. DESIGN: The referral calls addressed to the authors' ECMO center for patients with respiratory failure were prospectively recorded in a dedicated database. Referral call frequency, patient data, and results of the calls were analyzed. SETTING: The 12-bed intensive care unit of Careggi Hospital in Florence, the ECMO referral center for Tuscany, and the center of Italy, with a mobile ECMO team. PARTICIPANTS: Patients from intensive care units of peripheral hospitals for whom a referral call was addressed to the authors' ECMO center. INTERVENTIONS: Many possible responses were given after a referral call, varying from ECMO team deployment to advice or to refusal. MEASUREMENTS AND MAIN RESULTS: From January 1, 2014, to December 31, 2017, 231 calls were received at the authors' ECMO center, of which 220 calls were for acute respiratory failure cases. Throughout the study period the overall number of calls did not vary, but the percentage of ECMO retrievals decreased, whereas the percentage of ARF patients from peripheral hospital admitted to our ECMO center on conventional ventilation increased. Fifty-five patients were treated by the mobile ECMO team and were transferred on ECMO; 59 were admitted on ventilatory support. In flu periods the overall calls were more frequent than in the no-flu periods (171 v 82 calls), and more ECMO retrieval missions were deployed. CONCLUSIONS: During the study period, a decreased number of patients retrieved on ECMO was observed, whereas patients transferred on ventilation increased, with an overall unchanged number of referred patients.

Reduction of non-enzymatic antioxidants in plasma during ECMO-treatment in ARDS by influence A H1N1.

PURPOSE: In critically ill patient it is observed a severe oxidative stress, not only due to the acute pathology but also for some therapeutic treatments. The aim of the present study was to analyze the variations of non-enzymatic antioxidants in plasma during veno-venous ECMO-treatment in a homogeneous population of critical patients with ARDS. MATERIALS AND METHODS: We carried out a retrospective study enrolling all patients with ARDS by influence A H1N1 treated with veno-venous ECMO. In all patients included, we have recorded clinical and laboratory parameters considered indicators of oxidative stress during the first week of treatment. RESULTS: With regard to non-enzymatic antioxidants evaluated, we observed that both albumin and uric acid decreased significantly, at all observation times, after ECMO-treatment [(25.88±4.51, 18.05±4.27, 16.32±4.57, 19.07±5.10, p<0.05)(g/l), (5.46±1.43, 2.30±1.15, 2.90±2.09, 2.07±1.03, p<0.05)(mg/dl), respectively]. At the same time the amount of insulin administered daily was increased with statistical significance (p=0.03). CONCLUSIONS: The veno-venous ECMO-treatment causes a significant reduction of some of the major non-enzymatic antioxidants and a possible increase in insulin resistance in patients with ARDS by influence A H1N1.

The 8-Year Experience of the Florence Referral ECMO Center and Retrieval Team for Acute Respiratory Failure.

OBJECTIVE: Many extracorporeal membrane oxygenation (ECMO) centers for respiratory failure and ECMO mobile teams were instituted during the H1N1 pandemic. Data on transportation are scarce and heterogeneous. The authors therefore described the experience of their referral ECMO center for severe respiratory failure from 2009 to 2016 and gave a comprehensive report of transfers performed by their mobile ECMO team. DESIGN: Observational retrospective study. SETTING: An intensive care unit (ECMO referral center) in a teaching hospital. PARTICIPANTS: One hundred and sixty consecutive patients with acute respiratory distress syndrome refractory to conventional treatment requiring veno-venous (VV)-ECMO. INTERVENTION: VV-ECMO implantation. MEASUREMENTS AND MAIN RESULTS: In this series, the transferred patients on ECMO averaged 57%, with annual percentages ranging from 28% to 90% over the years. No adverse event was observed during transportation. A progressive increase in simplified acute physiology score (SAPS) values and in the use of norepinephrine were detectable (p = 0.048 and p = 0.037, respectively) as well as in neuromuscular blockers use (p = 0.004). Dual-lumen cannule were more frequently used in recent years (p < 0.001). The overall mortality rate was 40% (64/160), with no differences over the years or between transferred and local patients. Body mass index and pre-ECMO neuromuscular blockers and SAPS were independent predictors for early mortality (when adjusted for age). CONCLUSIONS: The workload of the authors' referral center and mobile team did not change, documenting that severe respiratory failure requiring VV-ECMO support is still a clinical need. No difference in mortality rate was detectable during this period or between transferred and local patients who were managed by the same team.

The utility of serial echocardiograms for organ procurement in brain death.

Heart transplantation rates are limited by a shortage of donor hearts, and left ventricular dysfunction is an important cause. We hypothesized that an early echocardiographic evaluation in severe brain injury (performed within 12 hours from ICU admission) could allow the detection of potentially reversible left ventricular (LV) abnormalities and thus the initiation of tailored treatment whose effects could be assessed at a second echocardiogram performed when brain death develops. We assessed this hypothesis in 49 patients with severe brain injury who were potential heart donors. A reduction in LV ejection fraction (LVEF) (<55%) was present in five patients (10.2%): diffuse hypokinesia in three patients (6.1%), segmental wall motion abnormalities in two (4.1%). Two patients showed apical ballooning (normal LVEF). The three patients with diffuse hypokinesia showed, at the echocardiogram performed 12 hours later, a complete recovery of wall motion and LVEF. Among patients with apical ballooning, a complete resolution was observed in both patients. Two patients were considered potentially eligible for heart donation, resulting in 20% increase in donor retrieval rate. In serious encephalic lesions, potentially evolving toward brain death, echocardiography performed after ICU admission allowed the identification of LV abnormalities, which could be specifically treated with complete resolution.

Extracorporeal life support and multiorgan donation in a severe polytrauma patient: A case report.

INTRODUCTION: Organ availability represents a key factor in transplants due to an almost universal shortage of deceased donors. PRESENTATION OF CASE: We present the case of a 41-year-old patients with severe polytrauma, where extracorporeal life support (ECLS) allowed brain death (BD) declaration and multiorgan retrieval and transplantation. DISCUSSION: Organ procurement is of utmost importance for transplant procedures. The presented case could rise ethical doubts as ECLS could be viewed as a tool for organ preservation instead of patient support. Nonetheless, it is obvious how organ preservation represents the necessary condition for patient preservation. CONCLUSION: Besides it' role in non heart beating donors, ECLS is emerging as an adjunctive tool for brain dead donors management when standard treatment fails, potentially allowing a substantial increase in organ availability.

Atypical clinic presentation of pandemic influenza A successfully rescued by extracorporeal membrane oxygenation - Our experience and review of the literature.

The novel pandemic influenza A (H1N1) caused an epidemic of critical illness, and some patients developed severe acute respiratory distress syndrome (ARDS) or severe cardiopulmonary failure despite the use of conventional management. Extracorporeal membrane oxygenation (ECMO) support may successfully rescue these severely ill patients. We demonstrate the causative role of H1N1 in refractory ARDS of a previously healthy 15-year-old man who presented to the intensive care unit with a hypoxic and persistent cardiogenic shock refractory to conventional management as the leading symptom of influenza A. Because of compromised cardiopulmonary function, venovenous ECMO was applied 24 h after admission. Despite that the patient was manifesting heart failure, we decided the placement of venovenous ECMO because we believed that the real problem was the uncontrollable hypoxia and hypercapnia. A normal left ventricular ejection fraction was documented on a 2D echocardiography on day 2. The patient, after 6 days of ECMO, recovered completely and was successfully weaned from the mechanical ventilator on the 9th day after admission. The patient was discharged from the hospital on the 15th day. This experience showed that ECMO can be lifesaving for severe H1N1 infection also in patients with atypical clinical presentation of influenza.

Late decompressive craniectomyafter traumatic brain injury: neurological outcome at 6 months after ICU discharge.

INTRODUCTION: The choice of optimal treatment in traumatic brain injured (TBI) patients is a challenge. The aim of this study was to verify the neurological outcome of severe TBI patients treated with decompressive craniectomy (early < 24 h, late > 24 h), compared to conservative treatment, in hospital and after 6-months. METHODS: A total of 186 TBI patients admitted to the ICU of the Emergency Department of a tertiary referral center (Careggi Teaching Hospital, Florence, Italy) from 2005 through 2009 were retrospectively studied. Patients treated with decompressive craniectomy were divided into 2 groups: "early craniectomy group" (patients who underwent to craniectomy within the first 24 hours); and "late craniectomy group" (patients who underwent to craniectomy later than the first 24 hours). As a control group, patients whose intracranial hypertension was successfully controlled by medical treatment were included in the "no craniectomy group". RESULTS: Groups included 41 patients who required early decompressive craniectomy, 21 patients treated with late craniectomy (7.7 days after trauma, on average), and 124 patients for whom intracranial hypertension was successfully controlled through conservative treatment. Groups were comparable in age and trauma/critical illness scores, except for a significantly higher Marshall score in early craniectomized patients. The Glasgow Outcome Scale was comparable between groups at ICU, at the time of hospital discharge and at 6 months. CONCLUSIONS: In our sample, a late craniectomy in patients with refractory intracranial hypertension produced a comparable 6-months neurological outcome if compared to patients responder to standard treatment. This data must be reproduced and confirmed before considering as goal-treatment in refractory intracranial hypertension.

Feasibility of inter-hospital transportation using extra-corporeal membrane oxygenation (ECMO) support of patients affected by severe swine-flu(H1N1)-related ARDS.

BACKGROUND: To describe the organization of an ECMO-centre from triage by telephone to the phase of inter-hospital transportation with ECMO of patients affected by H1N1-induced ARDS, describing techniques and equipment used. METHODS: From September 2009 to January 2010, 18 patients with H1N1-induced ARDS were referred to our ECMO-centre from other hospitals. Six patients had contraindications to treatment with ECMO and remained in the local hospital. Twelve patients were transported to our centre and were included in this study. Four patients were transported on ECMO (Group A) and eight on conventional ventilation (Group B). The groups were compared on the basis of adverse events during transport, clinical characteristics and outcome. RESULTS: The PaO2/FiO2 ratio was lower in the patients of Group A (46.8 vs 89.7 [median]) despite the PEEP values being higher (15.0 vs 8.5 [median]). The Murray score was higher in Group A (3.50 vs 2.75 [median]). During the transfer there were no significant complications noted in Group A, whereas two patients in Group B were reported with hypoxia (SpO2 < 90%). One patient in Group A died. All the other patients of the two groups have been discharged from hospital. CONCLUSIONS: The creation of an ECMO team, with various experts in the treatment of ARDS, assured a safe transfer of patients with severe hypoxia, over long distances, when in other cases they wouldn't have been be transportable.

Ventilatory and ECMO treatment of H1N1-induced severe respiratory failure: results of an Italian referral ECMO center.

BACKGROUND: Since the first outbreak of a respiratory illness caused by H1N1 virus in Mexico, several reports have described the need of intensive care or extracorporeal membrane oxygenation (ECMO) assistance in young and often healthy patients. Here we describe our experience in H1N1-induced ARDS using both ventilation strategy and ECMO assistance. METHODS: Following Italian Ministry of Health instructions, an Emergency Service was established at the Careggi Teaching Hospital (Florence, Italy) for the novel pandemic influenza. From Sept 09 to Jan 10, all patients admitted to our Intensive Care Unit (ICU) of the Emergency Department with ARDS due to H1N1 infection were studied. All ECMO treatments were veno-venous. H1N1 infection was confirmed by PCR assayed on pharyngeal swab, subglottic aspiration and bronchoalveolar lavage. Lung pathology was evaluated daily by lung ultrasound (LUS) examination. RESULTS: A total of 12 patients were studied: 7 underwent ECMO treatment, and 5 responded to protective mechanical ventilation. Two patients had co-infection by Legionella Pneumophila. One woman was pregnant. In our series, PCR from bronchoalveolar lavage had a 100% sensitivity compared to 75% from pharyngeal swab samples. The routine use of LUS limited the number of chest X-ray examinations and decreased transportation to radiology for CT-scan, increasing patient safety and avoiding the transitory disconnection from ventilator. No major complications occurred during ECMO treatments. In three cases, bleeding from vascular access sites due to heparin infusion required blood transfusions. Overall mortality rate was 8.3%. CONCLUSIONS: In our experience, early ECMO assistance resulted safe and feasible, considering the life threatening condition, in H1N1-induced ARDS. Lung ultrasound is an effective mean for daily assessment of ARDS patients.

Diagnosis of carotid arterial injury in major trauma using a modification of Memphis criteria.

BACKGROUND: Incidence of Blunt Cerebrovascular Injuries (BCVI) after head injury has been reported as 0.5-1% of all admissions for blunt trauma, with a high stroke and mortality rate. The purpose of this study is to evaluate if a modification of Memphis criteria could improve the rate of BCVI diagnosis. METHODS: Trauma patients consecutively admitted to Intensive Care Unit (ICU) from Jan 2008 to Oct 2009 were considered for the study. Memphis criteria comprehend: basilar skull fracture with involvement of the carotid canal, cervical spine fracture, neurological exam not explained by brain imaging, Horner's syndrome, LeFort II-III fractures, and neck soft tissue injury. As single criteria modification, we included all patients with petrous bone fracture, even without carotid canal involvement. In all patients at risk of BCVI, 64-slice angio-CT-scans was performed. RESULTS: During the study period, 266 patients were admitted to the ICU for blunt major trauma. Among them, 162 presented traumatic brain injury or cervical spine fracture. In accordance with the proposed modified-Memphis criteria, 53 patients showed risk factors for BCVI compared to 45 using the original Memphis criteria. Among the 53 patients, 6 resulted as having carotid lesions (2.2% of all blunt major traumas; one patient more than when using Memphis criteria). Anticoagulant therapy with low molecular weight heparin was administered in all patients. No stroke or hemorrhagic complications occurred. Clinical examination at 6-months showed no central neurological deficit. CONCLUSION: A modification of a single criteria of Memphis screening protocol might permit the identification of a higher percentage of BCVI. Limited by sample size, this study needs to be validated.

Implantation of 3951 long-term central venous catheters: performances, risk analysis, and patient comfort after ultrasound-guidance introduction.

BACKGROUND: Despite evidence demonstrating improved safety with ultrasound-guided placement of central venous catheters (CVC) in comparison with the use of anatomical landmarks, ultrasound guidance is still not routinely used by all physicians when obtaining central venous access. METHODS: We report data pertaining to the placement of long-term CVCs in a 7-year period before and after ultrasound guidance was introduced. We included 3951 procedures (total of 1,642,402 catheter days) in our study: 1584 using the anatomical landmark method (landmark group, January 2000 to May 2003), and 2367 with ultrasound guidance (ultrasound group, June 2003 to May 2007). All procedures were performed by the same team of intensivists. Comparison criteria included procedural data, complications, patient's comfort, and perceptions. Variables were analyzed with Student's t test and χ(2) test. Multivariate analysis was performed according to the Cox proportional hazards regression model. RESULTS: Using ultrasound guidance, we noted a significant reduction in procedure time in both port (mean difference 4.9 ± 0.4 minutes, confidence interval [CI] 4.1 to 5.7) and tunneled catheter (mean difference 2.4 ± 0.8 minutes, CI 0.9 to 3.8) placement. The landmark method was associated with an increased risk of overall perioperative complications (4.5, CI 3.6 to 5.6). Among disease entities, acute leukemia patients had a significantly higher risk of CVC-related infections (2.6, CI 2.1 to 3.8). On the basis of questionnaires submitted to patients from both groups, ultrasound guidance was associated with improved patient comfort and satisfaction. CONCLUSIONS: Ultrasound guidance reduces complications and improves patient comfort. Further studies are needed to define whether acute leukemia patients should be considered a separate category with regard to the higher incidence of infections.

Extracorporeal life support for management of refractory cardiac or respiratory failure: initial experience in a tertiary centre.

INTRODUCTION: Extracorporeal Life Support (ECLS) and extracorporeal membrane oxygenation (ECMO) have been indicated as treatment for acute respiratory and/or cardiac failure. Here we describe our first year experience of in-hospital ECLS activity, the operative algorithm and the protocol for centralization of adult patients from district hospitals. METHODS: At a tertiary referral trauma center (Careggi Teaching Hospital, Florence, Italy), an ECLS program was developed from 2008 by the Emergency Department and Heart and Vessel Department ICUs. The ECLS team consists of an intensivist, a cardiac surgeon, a cardiologist and a perfusionist, all trained in ECLS technique. ECMO support was applied in case of severe acute respiratory distress syndrome (ARDS) not responsive to conventional treatments. The use of veno-arterial (V-A) ECLS for cardiac support was reserved for cases of cardiac shock refractory to standard treatment and cardiac arrests not responding to conventional resuscitation. RESULTS: A total of 21 patients were treated with ECLS during the first year of activity. Among them, 13 received ECMO for ARDS (5 H1N1-virus related), with a 62% survival. In one case of post-traumatic ARDS, V-A ECLS support permitted multiple organ donation after cerebral death was confirmed. Patients treated with V-A ECLS due to cardiogenic shock (N = 4) had a survival rate of 50%. No patients on V-A ECLS support after cardiac arrest survived (N = 4). CONCLUSIONS: In our centre, an ECLS Service was instituted over a relatively limited period of time. A strict collaboration between different specialists can be regarded as a key feature to efficiently implement the process.

Experimentally-induced acute lung injury: the protective effect of hydroxyethyl starch.

The objective of this study was to evaluate the effects of hydroxyethyl starch, (130/0.4) 6%, compared to Ringer's acetate and modified gelatin on hypoxemia, inflammatory response, and oxidative stress in an experimental model of acute lung injury (ALI). The ALI/Adult Respiratory Distress Syndrome (ARDS) experimental model was produced by a bronchoalveolar saline lavage. Mature New Zealand white rabbits were anesthetized, provided with a tracheostomy and vascular catheters, and randomized to receive 25 ml/kg/hr of Ringer's acetate (group R, n = 7), 25 ml/kg/hr of modified gelatin (group G, n = 7), or 25 ml/kg/hr of hydroxyethyl starch (group S, n = 7). All of the rabbits received mechanical ventilation to maintain the PaCO2 between 35 and 45 mm Hg. Blood gas levels and hemodynamic values were recorded before induction of lung injury (T0) and 10 (T10), 120 (T120) and 240 (T240) min following induction of lung injury. At the same time-points, blood samples were collected to measure the plasma levels of TNFalpha (tumor necrosis factor-alpha) and TBARS (thiobarbituric acid-reactive substances). The experiment yielded the following results: The blood PaO2/FiO2 ratio was higher in group S than in groups R and G at T10, T120, and T240 (p <0.05). In group S, the plasma TNFalpha and TBARS concentrations were lower than in groups R and G at T120 and T240 (p <0.05). In conclusion, rabbits treated with hydroxyethyl starch, (130/0.4) 6%, demonstrated reductions of hypoxemia, inflammatory response, and oxidative lung damage, compared to raabbits treated with Ringer's acetate or modified gelatin.