Vasoactive Support Research Articles

Outcomes within 100 days of hematopoietic cell transplantation in pediatric patients: insights from an intensive care unit in Colombia.

Hematopoietic cell transplantation (HCT) has become an essential therapeutic modality for pediatric patients with malignant and non-malignant conditions. Despite its effectiveness, many patients experience post-transplant complications often leading into life-threatening conditions requiring specialized care in a Pediatric Intensive Care Unit (PICU). This study aims to describe clinical characteristics associated with mortality in pediatric HCT patients who needed PICU care within 100 days post-transplant in a resource-limited country. A retrospective cohort study was conducted involving pediatric HCT patients (<18 years old) admitted to our PICU from January 2012 to December 2021. Variables were characterized according to their nature, employing appropriate measures of central tendency and dispersion. The relationship between mortality and patient clinical characteristics was assessed using the Chi-square test or the Mann-Whitney U test, as applicable. A p-value of <0.05 was considered statistically significant. A Kaplan Meier survival curve was performed considering the days from HCT to death during PICU admission and a Cox regression analysis was conducted to analyze the association between PRISM III score and risk of death. Data analysis was executed utilizing the STATA SE v18 statistical software package. Of 316 HCTs, 69 patients required admission to the PICU. Haploidentical transplants from related donors were performed in 72.5% of these patients. The primary cause of PICU admission was infection, accounting for 68.1% (n = 47) of cases. Factors significantly associated with mortality included a PRISM III score > 20 (p < 0.002), mechanical ventilation (p < 0.007), renal replacement therapy (p < 0.002) and vasoactive support (p < 0.001). A total of 27 patients succumbed during their PICU stay. Kaplan Meier curve showed a survival rate of 51.6% at100-days post-transplant. A PRISM III score higher than 20 points was related with mortality (Hazard ratio 5.71 CI 95% 2.09-15.5). This study examines critical factors associated with mortality in pediatric HCT recipients who required admission to our PICU within the first 100 days post-transplant. Our findings indicate that infectious complications, alongside the need for advanced cardiovascular, respiratory, and renal support are strongly correlated with mortality. These results underscore the importance of early risk factor identification and targeted interventions to optimize patient outcomes.

Abstract 4138252: Association between Pressure-Adjusted Heart Rate and Mortality in Cardiogenic Shock

Introduction: Among patients with cardiogenic shock (CS), high right atrial pressure (RAP) and low mean arterial pressure (MAP) are associated with in-hospital mortality. Pressure-adjusted heart rate (PAHR), defined as heart rate * RAP-to-MAP ratio (HR * [RAP/MAP]), integrates these parameters and has been used to identify cardiovascular dysfunction in critical illness. Higher PAHR values associate with higher surgical ICU mortality, but the prognostic significance of PAHR has not been assessed in cardiac intensive care unit (CICU) patients with CS. Hypothesis: We hypothesized that higher PAHR values are associated with higher risk of in-hospital mortality in patients with CS. Methods: The Critical Care Cardiology Trials Network (CCCTN) is a multinational registry of CICUs coordinated by the TIMI Study Group. Among CS admissions (2018-2023) undergoing invasive hemodynamic assessment within 24h of CICU admission, we calculated PAHR (in bpm) and assessed its relationship with in-hospital mortality. Patients on temporary mechanical circulatory support were excluded. Odds ratios were adjusted for age, sex, vasoactive-inotropic score (VIS), SCAI stage, and preceding cardiac arrest. Subgroup analyses stratifying by CS subtype were performed. Results: Among the 1411 CS admissions in the analysis cohort (mean age 61 years, 31% women), 18% had AMI-CS, 75% had HF-CS, and 7% had secondary CS. At the time of assessment (median 1.4h after CICU admission), 75% were on vasoactive support (median VIS 3.8). Median HR was 92 (Q1-Q3 77-109) bpm, RAP 15 (Q1-Q3 10-19) mmHg, MAP 75 (Q1-Q3 67-87) mmHg, and PAHR 17 (Q1-Q3 11-24) bpm. A stepwise gradient of higher in-hospital mortality with increasing PAHR values (p-trend &lt;0.001; Fig ) was observed. In adjusted models, a higher PAHR was associated with higher in-hospital mortality (aOR per 10-bpm, 1.35 [95% CI, 1.15-1.58]), and had stronger prognostic associations with mortality than its individual hemodynamic components (Fig) . Conclusion: Higher PAHR is strongly associated with in-hospital mortality in CS patients. PAHR, a simple parameter which is readily calculable without needing a pulmonary artery catheter, may aid in identifying CS patients at higher risk of death.

Characteristics and Outcomes of Children and Young Adults With Sepsis Requiring Continuous Renal Replacement Therapy: A Comparative Analysis From the Worldwide Exploration of Renal Replacement Outcomes Collaborative in Kidney Disease (WE-ROCK).

Pediatric sepsis-associated acute kidney injury (AKI) often requires continuous renal replacement therapy (CRRT), but limited data exist regarding patient characteristics and outcomes. We aimed to describe these features, including the impact of possible dialytrauma (i.e., vasoactive requirement, negative fluid balance) on outcomes, and contrast them to nonseptic patients in an international cohort of children and young adults receiving CRRT. A secondary analysis of Worldwide Exploration of Renal Replacement Outcomes Collaborative in Kidney Disease (WE-ROCK), an international, multicenter, retrospective study. Neonatal, cardiac and PICUs at 34 centers in nine countries from January 1, 2015, to December 31, 2021. Patients 0-25 years old requiring CRRT for AKI and/or fluid overload. None. Among 1016 patients, 446 (44%) had sepsis at CRRT initiation and 650 (64%) experienced Major Adverse Kidney Events at 90 days (MAKE-90) (defined as a composite of death, renal replacement therapy [RRT] dependence, or > 25% decline in estimated glomerular filtration rate from baseline at 90 d from CRRT initiation). Septic patients were less likely to liberate from CRRT by 28 days (30% vs. 38%; p < 0.001) and had higher rates of MAKE-90 (70% vs. 61%; p = 0.002) and higher mortality (47% vs. 31%; p < 0.001) than nonseptic patients; however, septic survivors were less likely to be RRT dependent at 90 days (10% vs. 18%; p = 0.011). On multivariable regression, pre-CRRT vasoactive requirement, time to negative fluid balance, and median daily fluid balance over the first week of CRRT were not associated with MAKE-90; however, increasing duration of vasoactive requirement was independently associated with increased odds of MAKE-90 (adjusted OR [aOR], 1.16; 95% CI, 1.05-1.28) and mortality (aOR, 1.20; 95% CI, 1.1-1.32) for each additional day of support. Septic children requiring CRRT have different clinical characteristics and outcomes compared with those without sepsis, including higher rates of mortality and MAKE-90. Increasing duration of vasoactive support during the first week of CRRT, a surrogate of potential dialytrauma, appears to be associated with these outcomes.

Conservative fluid resuscitation protocol does not reduce the incidence of reoperation for bleeding after emergency CABG

Reoperation for bleeding (ROB) after emergency coronary artery bypass grafting (eCABG) has been identified as an independent risk factor for mortality. Consecutively, the influence of fluid intake, fluid output, fluid balance, blood loss, and inotropic demand on ROB were analyzed. This retrospective single-center study included 265 patients undergoing eCABG between 2011 and 2020. From 2018, postoperative hemodynamic management was performed with lower volume administration and higher vasoactive support. The primary outcome measure was the incidence of ROB within 48 h according to altered fluid resuscitation strategy. Consecutively, the influence of fluid intake, fluid output, fluid balance, blood loss, and inotropic demand on ROB were analyzed. Incidence of ROB was independent from the volume resuscitation protocol (P = .3). The ROB group had a higher perioperative risk, which was observed in EuroSCORE II. Fluid intake (P = .021), fluid balance (P = .001), and norepinephrine administration (P = .004) were associated with ROB. Fluid output and blood loss were not associated with ROB (P = .22). Post-test probability was low among all variables. Although fluid management might have an impact on specific postoperative complications, different fluid resuscitation protocols did not alter the incidence of ROB after emergency CABG.Trial registration: www.clinicaltrials.gov registration number NCT04533698; date of registration: August 31, 2020 (retrospectively registered due to nature of the study); URL: https://classic.clinicaltrials.gov/ct2/show/NCT04533698

Withdrawal/Withholding of Life-Sustaining Therapies: Limitation of Therapeutic Effort in the Intensive Care Unit.

Background/Objectives: The change in critically ill patients makes limitation of therapeutic effort (LTE) a widespread practice when therapeutic goals cannot be achieved. We aimed to describe the application of LTE in a post-surgical Intensive Care Unit (ICU), analyze the measures used, the characteristics of the patients, and their evolution. Methods: Retrospective observational study, including all patients to whom LTE was applied in a postsurgical ICU between January 2021 and December 2022. The LTE defined were brain death, withdrawal of measures, and withholding. Withholding limitations included orders for no cardiopulmonary resuscitation, no orotracheal intubation, no reintubation, no tracheostomy, no renal replacement therapies, and no vasoactive support. Patient and ICU admission data were related to the applied LTE. Results: Of the 2056 admitted, LTE protocols were applied to 106 patients. The prevalence of LTE in the ICU was 5.1%. Data were analyzed in 80 patients. A total of 91.2% of patients had been admitted in an emergency situation, and 56.2% had been admitted after surgery. The most widespread limitation was treatment withholding (83.8%) compared to withdrawal (13.8%). No differences were found regarding who made the decision and the type of limitation employed. However, patients with the limitation of no intubation had a longer stay (p = 0.025). Additionally, the order of not starting or increasing vasopressor support resulted in a longer hospital stay (p = 0.007) and a significantly longer stay until death (p = 0.044). Conclusions: LTE is a frequent measure in critically ill patient management and is less common in the postoperative setting. The most widespread measure was withholding, with the do-not-resuscitate order being the most common. The decision was made mainly by the medical team and the family, respecting the wishes of the patients. A joint patient-centered approach should be made in these decisions to avoid futile treatment and ensure end-of-life comfort.

Left ventricular outflow tract obstruction in Takotsubo syndrome with cardiogenic shock: prognosis and treatment

BackgroundPatients with Takotsubo syndrome (TTS) who develop cardiogenic shock may present with left ventricular outflow tract obstruction (LVOTO). The prognosis and treatment of this population have not been defined in...

Identification and transcriptomic assessment of latent profile pediatric septic shock phenotypes

BackgroundSepsis poses a grave threat, especially among children, but treatments are limited owing to heterogeneity among patients. We sought to test the clinical and biological relevance of pediatric septic shock subclasses identified using reproducible approaches.MethodsWe performed latent profile analyses using clinical, laboratory, and biomarker data from a prospective multi-center pediatric septic shock observational cohort to derive phenotypes and trained a support vector machine model to assign phenotypes in an internal validation set. We established the clinical relevance of phenotypes and tested for their interaction with common sepsis treatments on patient outcomes. We conducted transcriptomic analyses to delineate phenotype-specific biology and inferred underlying cell subpopulations. Finally, we compared whether latent profile phenotypes overlapped with established gene-expression endotypes and compared survival among patients based on an integrated subclassification scheme.ResultsAmong 1071 pediatric septic shock patients requiring vasoactive support on day 1 included, we identified two phenotypes which we designated as Phenotype 1 (19.5%) and Phenotype 2 (80.5%). Membership in Phenotype 1 was associated with ~ fourfold adjusted odds of complicated course relative to Phenotype 2. Patients belonging to Phenotype 1 were characterized by relatively higher Angiopoietin-2/Tie-2 ratio, Angiopoietin-2, soluble thrombomodulin (sTM), interleukin 8 (IL-8), and intercellular adhesion molecule 1 (ICAM-1) and lower Tie-2 and Angiopoietin-1 concentrations compared to Phenotype 2. We did not identify significant interactions between phenotypes, common treatments, and clinical outcomes. Transcriptomic analysis revealed overexpression of genes implicated in the innate immune response and driven primarily by developing neutrophils among patients designated as Phenotype 1. There was no statistically significant overlap between established gene-expression endotypes, reflective of the host adaptive response, and the newly derived phenotypes, reflective of the host innate response including microvascular endothelial dysfunction. However, an integrated subclassification scheme demonstrated varying survival probabilities when comparing patient endophenotypes.ConclusionsOur research underscores the reproducibility of latent profile analyses to identify pediatric septic shock phenotypes with high prognostic relevance. Pending validation, an integrated subclassification scheme, reflective of the different facets of the host response, holds promise to inform targeted intervention among those critically ill.Graphical abstract

Altered Microvascular Reactivity During a Skin Thermal Challenge Is Associated With Organ Dysfunction and Slow Recovery After Cardiac Surgery

ObjectivesTo assess microvascular reactivity during a skin thermal challenge early post-cardiac surgery and its association with outcome. DesignNon-invasive physiological study. SettingThirty-five-bed department of intensive care. ParticipantsPatients admitted to the ICU post-cardiac surgery. InterventionsThermal challenge. Measurements and Main ResultsForty-six patients were included; 14 needed vasoactive support or ventilatory support for at least 48 hours (slow recovery) and 32 had a more rapid recovery. Skin blood flow (SBF) was measured on the anterior proximal forearm using skin laser Doppler (SLD). A thermal challenge was performed by abruptly increasing local skin temperature from 37°C to 43°C while monitoring SBF. The ratio between the SBFs at 43°C and 37°C was calculated as a measure of microvascular reactivity. SBF at 37°C was not significantly different in patients with a slow recovery and those with a rapid recovery, but SBF after 9 min at 43°C was lower [48.5 (17.3-69.0) vs 85.1 (45.2-125.7), p<0.01], resulting in a lower SBF ratio [2.8 (1.5-4.7) vs 4.8 (3.7-7.8), p<0.01]. Patients with lower SBF ratios were more likely to have dysfunction of at least 1 organ (as assessed using the sequential organ dysfunction [SOFA] score) 48 hours post-cardiac surgery than those with higher ratios: 88% vs 40% vs 27% (p<0.01), respectively, for the lowest, middle, and highest tertiles of SBF ratio. In multivariable analysis, lower SBF ratio was an independent risk factor for slow recovery. ConclusionsEarly alterations in microvascular reactivity as evaluated by a skin thermal challenge are correlated with organ dysfunction. These observations may help in the development of new, simple, non-invasive monitoring systems in postoperative patients.

Microvascular Autoregulation in Skeletal Muscle Using Near-Infrared Spectroscopy and Derivation of Optimal Mean Arterial Pressure in the ICU: Pilot Study and Comparison With Cerebral Near-Infrared Spectroscopy.

Microvascular autoregulation (MA) maintains adequate tissue perfusion over a range of arterial blood pressure (ABP) and is frequently impaired in critical illness. MA has been studied in the brain to derive personalized hemodynamic targets after brain injury. The ability to measure MA in other organs is not known, which may inform individualized management during shock. This study determines the feasibility of measuring MA in skeletal muscle using near-infrared spectroscopy (NIRS) as a marker of tissue perfusion, the derivation of optimal mean arterial pressure (MAPopt), and comparison with indices from the brain. Prospective observational study. Medical and surgical ICU in a tertiary academic hospital. Adult critically ill patients requiring vasoactive support on the first day of ICU admission. Fifteen critically ill patients were enrolled. NIRS was applied simultaneously to skeletal muscle (brachioradialis) and brain (frontal cortex) while ABP was measured continuously via invasive catheter. MA correlation indices were calculated between ABP and NIRS from skeletal muscle total hemoglobin (MVx), muscle tissue saturation index (MOx), brain total hemoglobin (THx), and brain tissue saturation index (COx). Curve fitting algorithms derive the MAP with the lowest correlation index value, which is the MAPopt. MAPopt values were successfully calculated for each correlation index for all patients and were frequently (77%) above 65 mm Hg. For all correlation indices, median time was substantially above impaired MA threshold (24.5-34.9%) and below target MAPopt (9.0-78.6%). Muscle and brain MAPopt show moderate correlation (MVx-THx r = 0.76, p < 0.001; MOx-COx r = 0.69, p = 0.005), with a median difference of -1.27 mm Hg (-9.85 to -0.18 mm Hg) and 0.05 mm Hg (-7.05 to 2.68 mm Hg). This study demonstrates, for the first time, the feasibility of calculating MA indices and MAPopt in skeletal muscle using NIRS. Future studies should explore the association between impaired skeletal muscle MA, ICU outcomes, and organ-specific differences in MA and MAPopt thresholds.

Comparison of Ductal Stent Versus Surgical Shunt as Initial Intervention for Neonates with Pulmonary Atresia with Intact Ventricular Septum.

Data comparing surgical systemic-to-pulmonary artery shunt and patent ductus arteriosus (PDA) stent as the initial palliation procedure for patients with pulmonary atresia with intact ventricular septum (PA-IVS) are limited. We sought to compare characteristics and outcomes in a multicenter cohort of patients with PA-IVS undergoing surgical shunts versus PDA stents. We retrospectively reviewed neonates with PA-IVS from 2009 to 2019 in 19 United States centers. Bivariate comparisons and multivariable logistic regression analysis were performed to determine the relationship between initial palliation strategy and outcomes including major adverse cardiovascular events (MACE): stroke, mechanical circulatory support, cardiac arrest, or death. Included were 187 patients were included: 38 PDA stents and 149 surgical shunts. Baseline characteristics did not differ statistically between groups. Post-procedural MACE occurred in 4 patients (11%) with PDA stents versus 38 (26%) with surgical shunts, p = 0.079. Overall, the initial palliation strategy was not significantly associated with MACE (aOR:0.37; 95% CI,0.13-1.02). In patients with moderate-to-severe right ventricle hypoplasia, PDA stents were significantly associated with decreased odds of MACE (aOR:0.36; 95% CI,0.13-0.99). PDA stents were associated with lower vasoactive inotrope scores (median 0 versus 5, p < 0.001), greater likelihood to be extubated at the end of their procedure (37% versus 4%, p < 0.001), and shorter duration of mechanical ventilation (median 24 versus 96h, p < 0.001). PDA stents were associated with significantly more unplanned reinterventions for hypoxemia compared to surgical shunts (42% vs. 20%, p = 0.009). In this multicenter study, neonates with PA-IVS who underwent PDA stenting received less vasoactive and ventilatory support postoperatively compared to those who had surgical shunts. Furthermore, patients with the most severe morphology had decreased odds of MACE.

Pediatric Takotsubo cardiomyopathy: a review and insights from a national multicentric registry

Abstract Funding Acknowledgements None. Background Takotsubo syndrome (TTS) in the pediatric population is an infrequent but relevant cause of morbidity and mortality, with limited studies addressing its clinical course and prognosis. Objectives We aimed to analyze the clinical features and prognosis of pediatric TTS in a nation-wide multicenter registry and considering the published literature. Methods we included a total of 54 patients from 4 different hospitals in Spain, as well as pediatric TTS patients from the published literature. Comparisons between groups were performed in order to assess for statistically and clinically relevant prognostic differences between pediatric and adult population features. Results Comparison between the RETAKO general population is detailed in Table 1. Pediatric patients with TTS had a median age of 11 years (IQR = 4-14). When compared to the RETAKO general population, they were more often male (51.9% vs 23.3%, p&amp;lt;0.001), and displayed a higher prevalence of secondary forms (90.7% vs 35.6% in adults, p&amp;lt;0.001). Regarding race, 11 cases (20.4%) were from Asia and 42 (77.8%) were Caucasian; whereas in RETAKO 1420 (94.9%) were Caucasians, with under 5 cases (&amp;lt;0.1%) being Asian. Pediatric patients presented less commonly with angina (11.1% vs 64.1%, p&amp;lt;0.001) or dyspnea (30% vs 41.7%, p&amp;lt;0.001), compared to the general RETAKO cohort. Nevertheless, pediatric patients with TTS exhibited a higher Killip status on admission (Killip IV 74.1% vs 10.5%, p&amp;lt;0.001), and higher needs of vasoactive and mechanical ventilatory support during hospitalization. Regarding complementary exams, pediatric patients presented with lower LVEF on admission (30.5+10.4 vs 36.9+16.9, p = 0.014) together with greater prevalence of atypical (basal or midventricular) TTS patterns on echocardiography (30.2% vs 15.8%, p = 0.006). Additionally, there were significantly less ST-segment alterations in the pediatric population (either ST-segment elevation or depression), without differences on T wave inversion in the admission ECG. During follow-up, all-cause deaths (11.1% vs 12,5%, p = 0.761) and TTS recurrences (3.8% vs 3,8%, p = 0.863) were similar between groups. Conclusions TTS in the pediatric population presents a distinctive clinical profile, with higher prevalence of atypical symptoms and physical triggers; as well as higher rates of cardiogenic shock on admission and similar mortality and recurrence rates than those of the adult population. This study provides valuable insights into understanding pediatric TTS and underscored the necessity for further research in this age group.Table 1

Management Changes After Echocardiography Are Associated With Improved Outcomes in Critically Ill Children.

To evaluate management changes and outcomes in critically ill children after formal echocardiography. Retrospective cohort study between January 1, 2011, and December 31, 2020. Tertiary care children's hospital. Patients from 1 to 18 years who had formal echocardiography within 72 hours of ICU admission and who were intubated and on vasoactive infusions at the time of the study. Patients were stratified into two cardiac function groups: 1) near-normal cardiac function and 2) depressed cardiac function. Clinical variables were abstracted from the electronic medical record and placed in time sequence relative to echocardiography. Vasoactive and fluid management strategies in place before echocardiography were associated with markers of tissue perfusion and volume overload. Management changes after echocardiography were characterized and associated with outcomes. None. Among patients eventually found to have depressed cardiac function, the use of vasoconstrictors was associated with worse lactate clearance and oxygen extraction ratio. Use of vasoconstrictors in this cohort was also associated with a more liberal fluid management strategy, evidence of increased lung water, and a worse Sp o2 /F io2 . An echocardiogram demonstrated depressed cardiac function was likely to be followed by management changes that favored inotropes and more conservative fluid administration. Patients with depressed cardiac function who were switched to inotropes were more likely to be extubated and to wean off vasoactive support compared with those patients who remained on vasoconstrictors. Among patients with depressed cardiac function, alterations in management strategy after echocardiography are associated with shortened duration of intensive care interventions.

Early Serial Assessment of Aggregate Vasoactive Support and Mortality in Cardiogenic Shock: Insights From the Critical Care Cardiology Trials Network Registry.

Associations of early changes in vasoactive support with cardiogenic shock (CS) mortality remain incompletely defined. The Critical Care Cardiology Trials Network is a multicenter registry of cardiac intensive care units. Patients admitted with CS (2018-2023) had vasoactive dosing assessed at 4 and 24 hours from cardiac intensive care unit admission and quantified by the vasoactive-inotropic score (VIS). Prognostic associations of VIS at both time points, as well as change in VIS from 4 to 24 hours, were examined. Interaction testing was performed based on mechanical circulatory support status. Among 3665 patients, 82% had a change in VIS <10, with 7% and 11% having a ≥10-point increase and decrease from 4 to 24 hours, respectively. The 4 and 24-hour VIS were each associated with cardiac intensive care unit mortality (13%-45% and 11%-73% for VIS <10 to ≥40, respectively; Ptrend <0.0001 for each). Stratifying by the 4-hour VIS, changes in VIS from 4 to 24 hours had a graded association with mortality, ranging from a 2- to >4-fold difference in mortality comparing those with a ≥10-point increase to ≥10-point decrease in VIS (Ptrend <0.0001). The change in VIS alone provided good discrimination of cardiac intensive care unit mortality (C-statistic, 0.72 [95% CI, 0.70-0.75]) and improved discrimination of the 24-hour Sequential Organ Failure Assessment score (0.72 [95% CI, 0.69-0.74] to 0.76 [95% CI, 0.74-0.78]) and the clinician-assessed Society for Cardiovascular Angiography and Interventions shock stage (0.72 [95% CI, 0.70-0.74] to 0.77 [95% CI, 0.75-0.79]). Although present in both groups, the mortality risk associated with VIS was attenuated in patients managed with versus without mechanical circulatory support (odds ratio per 10-point higher 24-hour VIS, 1.36 [95% CI, 1.23-1.49] versus 1.84 [95% CI, 1.69-2.01]; Pinteraction <0.0001). Early changes in the magnitude of vasoactive support in CS are associated with a gradient of risk for mortality. These data suggest that early VIS trajectory may improve CS prognostication, with the potential to be leveraged for clinical decision-making and research applications in CS.

Exploration of factors affecting hemodynamic stability following pheochromocytoma resection - cohort study.

Surgery is the only way to cure pheochromocytoma; however, postoperative hemodynamic instability is one of the main causes of serious complications and even death. This study's findings provide some guidance for improved clinical management. This study was to investigate the factors leading to postoperative hemodynamic instability in the postoperative pathology indicated pheochromocytoma from May 2016 to May 2022. They were divided into two groups according to whether vasoactive drugs were used for a median number of days or more postoperatively. The factors affecting the postoperative hemodynamics in the perioperative period (preoperative, intraoperative, and postoperative) were then evaluated. The median number of days requiring vasoactive drug support postoperatively was three in 234 patients, while 118 (50.4%) patients required vasoactive drug support for three days or more postoperatively. The results of the multivariate analysis indicated more preoperative colloid use (odds ratio [OR]=1.834, confidence interval [CI]:1.265-2.659, P=0.001), intraoperative use of vasoactive drug (OR=4.174, CI:1.882-9.258, P<0.001), and more postoperative crystalloid solution input per unit of body weight per day (ml/kg/d) (OR=1.087, CI:1.062-1.112, P<0.001) were risk factors for predicting postoperative hemodynamic instability. The optimal cutoff point of postoperative crystalloid use were 42.37 ml/kg/d. Hemodynamic instability is a key issue for consideration in the perioperative period of pheochromocytoma. The amount of preoperative colloid use, the need for intraoperative vasoactive drugs, and postoperative crystalloid solution are risk factors for predicting postoperative hemodynamic instability (registration number: ChiCT2300071166).

Acute Kidney Injury Associated with Severe Leptospirosis: Fatal Re-Emerging Disease in Latin America

Leptospirosis is a re-emerging zoonotic disease that has had an unprecedented impact on most health systems in the world. The spectrum of symptoms is variable and usually ranges from asymptomatic cases to severe manifestations involving multiple organ dysfunction accompanied by jaundice, hemorrhage, meningitis, and acute kidney injury that requires the need for intensive care assistance. Although early antibiotic treatment is usually effective, in severe cases, it may require renal replacement therapy, invasive mechanical ventilation, vasoactive support, and invasive hemodynamic monitoring, increasing the risk of death. In Latin America, the real burden of acute kidney injury in this condition is unknown and may be underestimated due to the rapid progression of the disease, similar to other vector zoonoses, and the low coverage of diagnostic tests in primary care, especially in rural regions. Therefore, below, we review the clinical aspects and describe the scientific, clinical, and therapeutic evidence of acute kidney injury attributed to Leptospira spp. and its relevance in patients with severe leptospirosis in Latin America.

Morning or Afternoon Scheduling for Elective Coronary Artery Bypass Surgery: Influence of Longer Fasting Periods from Metabolic and Hemodynamic Perspectives.

Prolonged preoperative fasting may worsen postoperative outcomes. Cardiac surgery has higher perioperative risk, and longer fasting periods may be not well-tolerated. We analysed the postoperative metabolic and hemodynamic variables in patients undergoing elective coronary artery bypass grafting (CABG) according to their morning or afternoon schedule. Single-centre retrospective study at University teaching hospital (1-year data collection from electronic medical records). Using a mixed-effects linear regression model adjusted for several covariates, we compared metabolic (lactatemia, pH, and base deficit [BD]) and haemodynamic values (patients on vasoactive support, and vasoactive inotropic score [VIS]) at 7 prespecified time-points (admission to intensive care, and 1st, 3rd, 6th, 12th, 18th, and 24th postoperative hours). 339 patients (n = 176 morning, n = 163 afternoon) were included. Arterial lactatemia and BD were similar (overall P = 0.11 and P = 0.84, respectively), while pH was significantly lower in the morning group (overall P < 0.05; mean difference -0.01). Postoperative urine output, fluid balance, mean arterial pressure, and central venous pressure were similar (P = 0.59, P = 0.96, P = 0.58 and P = 0.53, respectively). A subgroup analysis of patients with diabetes (n = 54 morning, n = 45 afternoon) confirmed the same findings. The VIS values and the proportion of patients on vasoactive support was higher in the morning cases at the 18th (P = 0.002 and p=0.04, respectively) and 24th postoperative hours (P = 0.003 and P = 0.04, respectively). Mean intensive care length of stay was 1.94 ± 1.36 days versus 2.48 ± 2.72 days for the afternoon and morning cases, respectively (P = 0.02). Patients undergoing elective CABG showed similar or better metabolic and hemodynamic profiles when scheduled for afternoon surgery.

The association between different anesthetic techniques and outcomes in patients undergoing transfemoral aortic valve replacement.

There is an increasing number of patients undergoing transfemoral aortic valve replacement (TAVR) with sedation. There is limited data assessing the efficacy and safety of the different types of sedative drugs. The objective was to compare two sedation techniques with regard to the need for vasoactive support, respiratory support, rate of conversion to general anesthesia (GA), common perioperative morbidities, intensive care unit (ICU) stay, and in-hospital mortality. A retrospective chart review study conducted among patients who underwent TAVR at a specialized cardiac center between January 2016 and December 2019. Data collection included patient diagnosis, preoperative comorbidities, intraoperative outcomes, and postoperative outcomes. A total of 289 patients received local anesthesia; 210 received propofol infusion and 79 received a mixed propofol-ketamine infusion (Ketofol). The average age was 75.5 ± 8.9 years and 58.1% of the patients were females. Comparing propofol and ketofol groups, 31.2% and 34.2% of the patients required drug support, 7.6% and 6.3% required conversion to GA, 46.7% and 59.5% required respiratory support, respectively. These intraoperative outcomes were not significantly different between groups, P = 0.540, P = 0.707, and P = 0.105, respectively. In-hospital 30-day mortality in propofol and ketofol groups were 1.9% and 3.8%, respectively, P = 0.396. In both groups, the median post-procedure coronary care unit stay was 26 hours while post-procedure hospital stay was 3 days. There were no significant differences in perioperative or postoperative outcomes in TAVR patients receiving either propofol or ketofol. Propofol infusion, either alone or with ketamine, is reliable and safe, with minimal side effects.

Analysis of haemodynamics surrounding blood transfusions after the arterial switch operation: a pilot study utilising real-time telemetry high-frequency data capture.

Packed red blood cell transfusions occur frequently after congenital heart surgery to augment haemodynamics, with limited understanding of efficacy. The goal of this study was to analyse the hemodynamic response to packed red blood cell transfusions in a single cohort, as "proof-of-concept" utilising high-frequency data capture of real-time telemetry monitoring. Retrospective review of patients after the arterial switch operation receiving packed red blood cell transfusions from 15 July 2020 to 15 July 2021. Hemodynamic parameters were collected from a high-frequency data capture system (SickbayTM) continuously recording vital signs from bedside monitors and analysed in 5-minute intervals up to 6 hours before, 4 hours during, and 6 hours after packed red blood cell transfusions-up to 57,600 vital signs per packed red blood cell transfusions. Variables related to oxygen balance included blood gas co-oximetry, lactate levels, near-infrared spectroscopy, and ventilator settings. Analgesic, sedative, and vasoactive infusions were also collected. Six patients, at 8.5[IQR:5-22] days old and weighing 3.1[IQR:2.8-3.2]kg, received transfusions following the arterial switch operation. There were 10 packed red blood cell transfusions administered with a median dose of 10[IQR:10-15]mL/kg over 169[IQR:110-190]min; at median post-operative hour 36[IQR:10-40]. Significant increases in systolic and mean arterial blood pressures by 5-12.5% at 3 hours after packed red blood cell transfusions were observed, while renal near-infrared spectroscopy increased by 6.2% post-transfusion. No significant changes in ventilation, vasoactive support, or laboratory values related to oxygen balance were observed. Packed red blood cell transfusions given after the arterial switch operation increased arterial blood pressure by 5-12.5% for 3 hours and renal near-infrared spectroscopy by 6.2%. High-frequency data capture systems can be leveraged to provide novel insights into the hemodynamic response to commonly used therapies such as packed red blood cell transfusions after paediatric cardiac surgery.

Reduction in Postoperative Right Ventricular Echocardiographic Indices Predicts Longer Duration of Vasoactive Support After Cardiac Surgery

ObjectivesTo assess perioperative RV echocardiographic indices and their relationship to vasopressor and inotropic support in cardiac surgical patients. We hypothesized that a reduction in echocardiographic parameters of RV function is associated with longer duration of vasopressor and inotropic support in the ICU. DesignA prospective observational study. SettingA quaternary care hospital affiliated to McGill University, Canada. ParticipantsAdult patients undergoing elective cardiac surgery. InterventionsTransesophageal echocardiography and hemodynamics measurements with a pulmonary artery catheter was performed after induction of anesthesia (pre-cardiopulmonary bypass; pre-CPB) and at post-CPB. Measurements and Main ResultsEchocardiographic measurements included anatomical M-mode tricuspid annular plane systolic excursion (AMM-TAPSE), fractional area change (FAC), tricuspid annulus peak systolic velocity (S’) and myocardial performance index (MPI). The primary outcome was the duration of vasopressor and inotropic support in the intensive care unit (ICU).Of the 122 patients who were enrolled in the study, 83 underwent coronary artery bypass graft surgery. At the end of the procedure, 94.3% of the subjects were supported with a vasopressor or inotrope. A reduction in post-CPB TAPSE was found in 88.2% (105 patients) and 56.8% (63 patients) had a reduction in FAC. Patients with a post-CPB TAPSE below 17 mm and a post-CPB FAC below 35% required a longer duration of inotropic support in the ICU. ConclusionPatients with post-CPB TAPSE <17 mmHg require longer duration of inotropic support in the ICU. From all measured RV echocardiographic indices, post-CPB FAC is an independent predictor of vasopressor and inotropic support. A reduction of post-CPB TAPSE and FAC in patients undergoing cardiac surgery is indicative of RV dysfunction requiring a longer use of vasopressor and inotropic support and potentially longer stay in the cardiovascular ICU.

Association Between Nurse Copatient Illness Severity and Mortality in the ICU.

In the context of traditional nurse-to-patient ratios, ICU patients are typically paired with one or more copatients, creating interdependencies that may affect clinical outcomes. We aimed to examine the effect of copatient illness severity on ICU mortality. We conducted a retrospective cohort study using electronic health records from a multihospital health system from 2018 to 2020. We identified nurse-to-patient assignments for each 12-hour shift using a validated algorithm. We defined copatient illness severity as whether the index patient's copatient received mechanical ventilation or vasoactive support during the shift. We used proportional hazards regression with time-varying covariates to assess the relationship between copatient illness severity and 28-day ICU mortality. Twenty-four ICUs in eight hospitals. Patients hospitalized in the ICU between January 1, 2018, and August 31, 2020. None. The main analysis included 20,650 patients and 84,544 patient-shifts. Regression analyses showed a patient's risk of death increased when their copatient received both mechanical ventilation and vasoactive support (hazard ratio [HR]: 1.30; 95% CI, 1.05-1.61; p = 0.02) or vasoactive support alone (HR: 1.82; 95% CI, 1.39-2.38; p < 0.001), compared with situations in which the copatient received neither treatment. However, if the copatient was solely on mechanical ventilation, there was no significant increase in the risk of death (HR: 1.03; 95% CI, 0.86-1.23; p = 0.78). Sensitivity analyses conducted on cohorts with varying numbers of copatients consistently showed an increased risk of death when a copatient received vasoactive support. Our findings suggest that considering copatient illness severity, alongside the existing practice of considering individual patient conditions, during the nurse-to-patient assignment process may be an opportunity to improve ICU outcomes.