Invasive Hemodynamic Monitoring Research Articles

Analysis of hemodynamics and impedance using bioelectrical impedance analysis in hypovolemic shock-induced swine model

To treat hypovolemic shock, fluid infusion or blood transfusion is essential to address insufficient volume. Much controversy surrounds resuscitation in hypovolemic shock. We aimed to identify the ideal fluid combination for treating hypovolemic shock-induced swine model, analyzing bioelectrical impedance and hemodynamics. Fifteen female three-way crossbred pigs were divided into three different groups. The three resuscitation fluids were (1) balanced crystalloid, (2) balanced crystalloid + 5% dextrose water, and (3) balanced crystalloid + 20% albumin. The experiment was divided into three phases and conducted sequentially: (1) controlled hemorrhage (1 L bleeding, 60 min), (2) resuscitation phase 1 (1 L fluid infusion, 60 min), and (3) resuscitation phase 2 (1 L fluid infusion, 60 min). Bioelectrical impedance analysis was implemented with a segmental multifrequency bioelectrical impedance analyzer. A total of 61 impedance measurements were assessed for each pig at six different frequencies in five segments of the pig. Pulse rate (PR), mean arterial pressure (MAP), stroke volume (SV), and stroke volume variation (SVV) were measured using a minimally invasive hemodynamic monitoring device. The three-dimensional graph showed a curved pattern when infused with 1 L of balanced crystalloid + 1 L of 5% dextrose water and 1.6 L of balanced crystalloid + 400 ml of 20% albumin. The 1M impedance increased in all groups during the controlled hemorrhage, and continuously decreased from fluid infusion to the end of the experiment. Only balanced crystalloid + 20% albumin significantly restored MAP and SV to the same level as the start of the experiment after the end of fluid infusion. There were no significant differences in MAP and SV from the time of recovery to the initial value of 1M impedance to the end of fluid infusion in all groups. The change and the recovery of hemodynamic indices such as MAP and SV coincide with the change and the recovery of 1M impedance. Using balanced crystalloid mixed with 20% albumin in hypovolemic shock-induced swine model may be helpful in securing hemodynamic stability, compared with balanced crystalloid single administration.

Non-Invasive Hemodynamic Monitoring System Integrating Spectrometry, Photoplethysmography, and Arterial Pressure Measurement Capabilities.

Minimally invasive and non-invasive hemodynamic monitoring technologies have recently gained more attention, driven by technological advances and the inherent risk of complications in invasive techniques. In this article, an experimental non-invasive system is presented that effectively combines the capabilities of spectrometry, photoplethysmography (PPG), and arterial pressure measurement. Both time- and wavelength-resolved optical signals from the fingertip are measured under external pressure, which gradually increased above the level of systolic blood pressure. The optical channels measured at 434-731 nm divided into three groups separated by a group of channels with wavelengths approximately between 590 and 630 nm. This group of channels, labeled transition band, is characterized by abrupt changes resulting from a decrease in the absorption coefficient of whole blood. External pressure levels of maximum pulsation showed that shorter wavelengths (<590 nm) probe superficial low-pressure blood vessels, whereas longer wavelengths (>630 nm) probe high-pressure arteries. The results on perfusion indices and DC component level changes showed clear differences between the optical channels, further highlighting the importance of wavelength selection in optical hemodynamic monitoring systems. Altogether, the results demonstrated that the integrated system presented has the potential to extract new hemodynamic information simultaneously from macrocirculation tomicrocirculation.

EFFECT OF PULMONARY ARTERY CATHETERIZATION IN PATIENTS WITH NONISCHEMIC CARDIOGENIC SHOCK: A NATIONWIDE ANALYSIS.

Background: Pulmonary artery catheterization (PAC) has been widely used in critically ill patients, yielding mixed results. Prior studies on cardiogenic shock (CS) predominantly included patients with acute myocardial infarction. This study aims to examine the effect of PAC use in patients with nonischemic CS. Methods: This retrospective cohort study employed data from the National Inpatient Sample database, including weighted hospitalizations of adult patients with nonischemic CS during 2017 to 2019. In-hospital outcomes were compared between groups using inverse probability of treatment weighting. Results: A total of 303,970 patients with nonischemic CS were included, of whom 17.5% received a PAC during their hospitalization. The median age was 67 years (interquartile range: 57-77) and 61% were male. After inverse probability of treatment weighting, patients in the PAC group had significantly lower in-hospital mortality (24.8% vs. 35.3%, P < 0.001), renal replacement therapy (10.7% vs. 12.4%, P = 0.002), in-hospital cardiac arrest (7.1% vs. 9.6%, P < 0.001), and mechanical ventilation (44.6% vs. 50.4%, P < 0.001) compared to non-PAC group. In contrast, the PAC group had higher use of intra-aortic balloon pump (15.4% vs. 3.4%, P < 0.001), percutaneous ventricular assist devices (12.6% vs. 2.6%, P < 0.001), extracorporeal membrane oxygenation (3.9% vs. 2.5%, P < 0.001), and heart transplantation (2.1% vs. 0.4%, P < 0.001). Conclusion: In the real-world setting, invasive hemodynamic monitoring with PAC in patients with nonischemic CS is associated with survival benefits and a reduction in adverse events, including reduced need for renal replacement therapy, mechanical ventilation and risk of in-hospital cardiac arrest.

Correlation of Caval Index and Central Venous Pressure in Non-ventilated Critically ill Patients

Background: Determination of intravascular volume status can sometimes be challenging part of critically ill patient’s management in ICU. Invasive haemodynamic monitoring of central venous pressure is a useful guide in directing early resuscitative efforts and assist in reducing the morbidity and mortality of ICU patients with severe sepsis/septic shock. Obtaining invasive hemodynamic monitoring can lead to complications and time consuming. Sonographic measurement of the inferior vena cava (IVC) diameter and IVC collapsibility, termed the caval index is a non-invasive method of estimating the fluid status in critically ill patients. The study was designed to see the correlation between caval index and central venous pressure (CVP) in non-ventilated critically ill patients. Objectives: The aim of the study was to evaluate the correlation of caval index and central venous pressure in non-ventilated critically ill patients. Methods: It was a hospital based descriptive type of cross-sectional study, carried out in the ICU at the Department of Anaesthesia, Analgesia, Palliative &amp; Intensive Care Medicine, Dhaka Medical College Hospital, Dhaka from the period of May 2017 to October 2018. A total number of 86 patients were enrolled in this study. Study subjects were patients (age &gt;18 years) with critically-ill non-ventilated and whom central venous catheter inserted for CVP monitoring. Central venous pressure was measured first by CVP manometer. Then IVC diameter and caval index were measured with curvilinear probe of the Sonosite ultrasound device. The correlation of CVP and CI was calculated. Statistical analyses of the results were obtained by using window-based Microsoft Excel and Statistical Packages for Social Sciences (SPSS-24). Results: In this study, according to CVP 33.7% (29) of patients were hypovolemic with mean (±SD) CVP 5.3±1.2 cm H20, euvolemic were 38.3% (33) with mean (±SD) CVP 10.6±1.7 cm H20 and hypervolemic were 27.9% (24) with mean±SD CVP 16.1±1.5 cm H20. Mean caval index (CI) (%) mean (±SD) was found 57.1±7.23 in hypovolemic patients, 39.5±2.65 in euvolemic &amp; hypervolemic patients. So, the result shows &gt;50 % CI is associated with CVP &lt; 8 mm of Hg and &lt; 50% CI is associated with CVP &gt; 8 mm of Hg. Pearsons correlation coefficient test used to assess the strength and nature of correlation between two variables. There was a statistically significant correlation between the mean CVP and the caval index (p &lt; 0.001). So findings revealed that there is an inverse relationship between the caval index and CVP. Conclusion: The caval index had acceptable correlation with CVP at the level of IVC entry into the right atrium. It was concluded that there is an inverse relationship of CVP with the caval index. Bangladesh Crit Care J March 2024; 12 (1): 29-34

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.

Do Laparoscopic Colorectal Procedures Need Fluid Optimization?

BACKGROUND: Goal-directed fluid therapy (GDFT) with hemodynamic monitoring may not be of benefit to all elective patients undergoing major abdominal surgery, particularly those managed in enhanced recovery after surgery protocols (ERAS) setting. AIMS: We predicted different fluid and vasoactive drug consumption during the procedure and less complications in the group of patients, where invasive hemodynamic monitoring was used. METHODS: Two groups of patients undergoing elective laparoscopic colorectal surgery were compared: A control group (CG), with standard hemodynamic monitoring, and a study group, (SG) with invasive hemodynamic monitoring and appropriate intraoperative interventions. We compared differences in intraoperative fluid consumption, length of hospital stay (LOS) and post-operative morbidity. RESULTS: A group of 29 patients in SG had similar average intraoperative fluid balance (+438 mL) as 27 patients in CG (+345 mL) p = 0.432. Average LOS was 8 days (±4) in SG and 6 days (±1) in CG (p = 0.124). Acute renal failure, anastomotic dehiscence, and indication for antibiotic treatment were predictors of statistically significant prolongation of hospital stay 3rd day after surgery, but independent of SG. CONCLUSION: Since no differences between the groups were shown in overall fluid and vasoactive drug consumption, we conclude that GDFT is not needed in laparoscopic colorectal surgery, when ERAS is followed.

Semaglutide attenuates doxorubicin-induced cardiotoxicity by ameliorating BNIP3-Mediated mitochondrial dysfunction

AimsDoxorubicin is a powerful chemotherapeutic agent for cancer, whose use is limited due to its potential cardiotoxicity. Semaglutide (SEMA), a novel analog of glucagon-like peptide-1 (GLP-1), has received widespread attention for the treatment of diabetes. However, increasing evidence has highlighted its potential therapeutic benefits on cardiac function. Therefore, the objective of this study was to examine the efficacy of semaglutide in ameliorating doxorubicin-induced cardiotoxicity. Methods and resultsDoxorubicin-induced cardiotoxicity is an established model to study cardiac function. Cardiac function was studied by transthoracic echocardiography and invasive hemodynamic monitoring. The results showed that semaglutide significantly ameliorated doxorubicin-induced cardiac dysfunction. RNA sequencing suggested that Bnip3 is the candidate gene that impaired the protective effect of semaglutide in doxorubicin-induced cardiotoxicity. To determine the role of BNIP3 on the effect of semaglutide in doxorubicin-induced cardiotoxicity, BNIP3 with adeno-associated virus serotype 9 (AAV9) expressing cardiac troponin T (cTnT) promoter was injected into tail vein of C57/BL6J mice to overexpress BNIP3, specifically in the heart. Overexpression of BNIP3 prevented the improvement in cardiac function caused by semaglutide. In vitro experiments showed that semaglutide, via PI3K/AKT pathway, reduced BNIP3 expression in the mitochondria, improving mitochondrial function. ConclusionSemaglutide ameliorates doxorubicin-induced mitochondrial and cardiac dysfunction via PI3K/AKT pathway, by reducing BNIP3 expression in mitochondria. The improvement in mitochondrial function reduces doxorubicin-mediated cardiac injury and improves cardiac function. Therefore, semaglutide is a potential therapy to reduce doxorubicin-induced acute cardiotoxicity.

Photoplethysmography and intracardiac pressures: early insights from a pilot study.

Invasive haemodynamic monitoring of heart failure (HF) is used to detect deterioration in an early phase thereby preventing hospitalizations. However, this invasive approach is costly and presently lacks widespread accessibility. Hence, there is a pressing need to identify an alternative non-invasive method that is reliable and more readily available. In this pilot study, we investigated the relation between wrist-derived photoplethysmography (PPG) signals and the invasively measured pulmonary capillary wedge pressure (PCWP). Fourteen patients with aortic valve stenosis who underwent transcatheter aortic valve replacement with concomitant right heart catheterization and PPG measurements were included. Six unique features of the PPG signals [heart rate, heart rate variability, systolic amplitude (SA), diastolic amplitude, crest time (CT), and large artery stiffness index (LASI)] were extracted. These features were used to estimate the continuous PCWP values and the categorized PCWP (low < 12 mmHg vs. high ≥ 12 mmHg). All PPG features resulted in regression models that showed low correlations with the invasively measured PCWP. Classification models resulted in higher performances: the model based on the SA and the model based on the LASI both resulted in an area under the curve (AUC) of 0.86 and the model based on the CT resulted in an AUC of 0.72. These results demonstrate the capability to non-invasively classify patients into clinically meaningful categories of PCWP using PPG signals from a wrist-worn wearable device. To enhance and fully explore its potential, the relationship between PPG and PCWP should be further investigated in a larger cohort of HF patients.

Successful treatment of severe calcium channel blocker poisoning, new experience with the guidance of invasive hemodynamic monitoring in a 17-year-old girl: a case report

BackgroundCalcium channel blocker poisoning is one of the most lethal cardiac drugs overdoses. Calcium and high-dose insulin infusion are the first-line therapy for symptomatic patients, and Intralipid emulsion infusion is useful for refractory cases.Case presentationIn this report, we describe a 17-year-old Iranian girl who took 250 mg of the drug for a suicidal attempt and presented with refractory hypotension and non-cardiogenic pulmonary edema treated successfully with the guidance of invasive hemodynamic parameters.ConclusionFor complicated cases, in addition to supportive care and adjuvant therapy such as high-dose insulin and Intralipid, it is mandatory to utilize advanced hemodynamic monitoring to treat hypotension in severe calcium channel blocker poisoning to guide the treatment.

Interhospital Variation in Admissions Managed With Critical Care Therapies or Invasive Hemodynamic Monitoring in Tertiary Cardiac Intensive Care Units: An Analysis From the Critical Care Cardiology Trials Network Registry.

Wide interhospital variations exist in cardiovascular intensive care unit (CICU) admission practices and the use of critical care restricted therapies (CCRx), but little is known about the differences in patient acuity, CCRx utilization, and the associated outcomes within tertiary centers. The Critical Care Cardiology Trials Network is a multicenter registry of tertiary and academic CICUs in the United States and Canada that captured consecutive admissions in 2-month periods between 2017 and 2022. This analysis included 17 843 admissions across 34 sites and compared interhospital tertiles of CCRx (eg, mechanical ventilation, mechanical circulatory support, continuous renal replacement therapy) utilization and its adjusted association with in-hospital survival using logistic regression. The Pratt index was used to quantify patient-related and institutional factors associated with CCRx variability. The median age of the study population was 66 (56-77) years and 37% were female. CCRx was provided to 62.2% (interhospital range of 21.3%-87.1%) of CICU patients. Admissions to CICUs with the highest tertile of CCRx utilization had a greater burden of comorbidities, had more diagnoses of ST-elevation myocardial infarction, cardiac arrest, or cardiogenic shock, and had higher Sequential Organ Failure Assessment scores. The unadjusted in-hospital mortality (median, 12.7%) was 9.6%, 11.1%, and 18.7% in low, intermediate, and high CCRx tertiles, respectively. No clinically meaningful differences in adjusted mortality were observed across tertiles when admissions were stratified by the provision of CCRx. Baseline patient-level variables and institutional differences accounted for 80% and 5.3% of the observed CCRx variability, respectively. In a large registry of tertiary and academic CICUs, there was a >4-fold interhospital variation in the provision of CCRx that was primarily driven by differences in patient acuity compared with institutional differences. No differences were observed in adjusted mortality between low, intermediate, and high CCRx utilization sites.

INVASIVE HEMODYNAMIC MONITORING WITH PULMONARY ARTERY CATHETER IN SEPSIS-ASSOCIATED CARDIOGENIC SHOCK.

Background: Both sepsis-induced cardiomyopathy and worsening of preexisting cardiac disease can contribute to circulatory shock in septic patients. The early use of pulmonary artery catheter (PAC) could play a pivotal role in the management of sepsis-associated cardiogenic shock. In this study, we aimed to evaluate the impact of early invasive hemodynamic monitoring with PAC in patients with sepsis-associated cardiogenic shock. Method: We performed a retrospective study using the National Inpatient Sample data from January 2017 to December 2019. The early use of PAC was defined as the use of PAC within 2 days from the admission. We performed the multivariable logistic regression analysis to investigate the association between the early use of PAC and in-hospital mortality in patients with sepsis-associated cardiogenic shock and sepsis without cardiogenic shock, respectively. Results: There was no difference in in-hospital mortality between PAC and no PAC groups in sepsis without cardiogenic shock (adjusted odds ratio [aOR] = 1.05, 95% confidence interval [CI] = 0.82-1.35, P = 691). On the other hand, the early use of PAC was independently associated with lower in-hospital mortality in patients with sepsis-associated cardiogenic shock (aOR = 0.58, 95% confidence interval [CI] = 0.46-0.72, P < 0.001). The use of PAC was also associated with increased use of mechanical circulatory support in those with sepsis-associated cardiogenic shock (aOR = 12.26, 95% CI = 9.37-16.03, P < 0.001). For patients with sepsis-associated cardiogenic shock, the use of PAC after 2 days of admission was associated with significantly higher in-hospital mortality and decreased use of mechanical circulatory support. Conclusion: The use of pulmonary artery catheters in sepsis-associated cardiogenic shock was associated with significantly lower in-hospital mortality and increased use of mechanical circulatory supports in patients with sepsis-associated cardiogenic shock.

The Role of Invasive Hemodynamic Monitoring in Patients with Severe Mitral Regurgitation Undergoing Herniorrhaphy Operation

Background: Mitral regurgitation (MR) indeed presents challenges during noncardiac surgeries, especially as the severity of MR tends to increase with age and poses a higher risk of perioperative complications. Accurate hemodynamic monitoring becomes crucial in these cases to manage potential complications effectively. However, the standard monitoring in MR conditions during operation, such as TEE, is not always available, but there are other options for invasive monitoring, such as arterial lines, which provide accurate hemodynamic monitoring.&#x0D; Case presentation: A 64-year-old, male, presented with Reponible Lateral Inguinal Hernia with comorbid of severe mitral and tricuspid regurgitation alongside congestive heart failure. The patient was premedicated with fentanyl 25 mcg intravenously, followed by oxygen supplementation with 3 lpm nasal cannula and insertion of the arterial line. Anaesthesia was performed using a lumbar epidural technique, with the insertion of an epidural catheter in the L1-L2 intervertebral space, Reponible Lateral Inguinal Hernia. The local anesthesia agent chosen was plain bupivacaine with a concentration of 0.5% and a volume of 8 ml. The onset of action of epidural anesthesia is achieved within 20 minutes as long as the operation reaches a total blockade as high as T8. The patient is monitored with standard monitors and an artery line during surgery. There were no complaints of shortness of breath, chest heaviness, or chest pain felt by the patient during the operation.&#x0D; Conclusion: Epidural anesthesia technique can provide stable hemodynamics in patients with severe mitral-tricuspid regurgitation and congestive heart failure and hemodynamic monitoring plays an important role postoperatively to prevent further deterioration and maintain stability.

Cardiac intensive care unit: where we are in 2023

Cardiac intensive care has been a constantly evolving area of research and innovation since the beginning of the 21st century. The story began in 1961 with Desmond Julian's pioneering creation of a coronary intensive care unit to improve the prognosis of patients with myocardial infarction, considered the major cause of death in the world. These units have continued to progress over time, with the introduction of new therapeutic means such as fibrinolysis, invasive hemodynamic monitoring using the Swan-Ganz catheter, and mechanical circulatory assistance, with significant advances in percutaneous interventional coronary and structural procedures. Since acute cardiovascular disease is not limited to the management of acute coronary syndromes and includes other emergencies such as severe arrhythmias, acute heart failure, cardiogenic shock, high-risk pulmonary embolism, severe conduction disorders, and post-implantation monitoring of percutaneous valves, as well as other non-cardiac emergencies, such as septic shock, severe respiratory failure, severe renal failure and the management of cardiac arrest after resuscitation, the conversion of coronary intensive care units into cardiac intensive care units represented an important priority. Today, the cardiac intensive care units (CICU) concept is widely adopted by most healthcare systems, whatever the country's level of development. The main aim of these units remains to improve the overall morbidity and mortality of acute cardiovascular diseases, but also to manage other non-cardiac disorders, such as sepsis and respiratory failure. This diversity of tasks and responsibilities has enabled us to classify these CICUs according to several levels, depending on a variety of parameters, principally the level of care delivered, the staff assigned, the equipment and technologies available, the type of research projects carried out, and the type of connections and networking developed. The European Society of Cardiology (ESC) and the American College of Cardiology (ACC) have detailed this organization in guidelines published initially in 2005 and updated in 2018, with the aim of harmonizing the structure, organization, and care offered by the various CICUs. In this state-of-the-art report, we review the history of the CICUs from the creation of the very first unit in 1968 to the discussion of their current perspectives, with the main objective of knowing what the CICUs will have become by 2023.

A novel hemodynamic index characterizing mitral regurgitation undergoing transcatheter edge to edge repair: the mitral pulse pressure fraction

Abstract Objectives Our study sought to investigate the role of invasive hemodynamic monitoring during Transcatheter Edge to Edge Repair (TEER) procedure on top of transesophageal echocardiographic (TEE) guidance. Background Direct hemodynamic impact of residual MR after TEER is not always univocally measured by TEE assessment alone. When analyzing TEER procedure result operators often encounter discrepancy between TEE guidance and invasive hemodynamic monitoring. Methods We analyzed 78 patients with moderate-to-severe or severe mitral regurgitation (MR) who underwent TEER. Mitral pulse Pressure Fraction (MPF) was extracted from intraprocedural continuous left atrial pressure monitoring. 23 patients with the same grade of MR not undergoing TEER were included as a control group. Results TEER had a significant impact reducing MR burden on both TEE guidance and invasive hemodynamic monitoring. Post-TEER MPF was significantly reduced compared to both pre-TEER setting (p &amp;lt; 0.001) and control group (p = 0.004). MR reduction assessed by TEE guidance was not found to be correlated with improved clinical and functional status at follow-up as assessed by New York Heart Association (NYHA) classification (p = 0.424) and 12-items Kansas City Cardiomyopathy Questionnaire (KCCQ) (p = 0.1). On the contrary, a greater reduction in MPF was associated with a significant amelioration of both NYHA classification (p = 0.003) and 12-items KCCQ (p&amp;lt;0.001) during the follow-up period. Conclusions MPF provides an immediate estimate of the real hemodynamic impact of MR and can offer a prompt prediction of the functional improvement after TEER.

MCS current practice and weaning: CCCTN survey of CICU directors at academic medical centers

Abstract Background/Introduction As the treatment of cardiogenic shock evolves, temporary mechanical circulatory support (MCS) use is increasing. Few studies have examined Cardiac Intensive Care Unit (CICU) practices for management and weaning of MCS. Purpose We aimed to describe current management and weaning practices for patients supported with an intra-aortic balloon pump (IABP) or Impella in CICUs. Methods During December 2022, a 45-question survey was electronically distributed by the Critical Care Cardiology Trials Network (CCCTN) to the CICU directors of 44 academic medical centers in North America. Descriptive statistics were used to summarize the results. Results A response rate of 84% was achieved. Among respondents, CICU bed capacity ranged from 8-32 (Mean of 17). Staffing was primarily by cardiologists without board certification in heart failure or critical care (38%). One-in-four centers reported staffing by a multi-disciplinary team consisting of cardiologists and intensivists. Most centers use heparin anticoagulation for both IABP (32, 87%) and Impella (32, 91%) and primarily used PTT to monitor anticoagulation (23, 62%) with a target of 50-70 seconds (27, 73%). While using Impella support, daily TTE (29%), plasma free hemoglobin measurements (34%) and prophylactic antibiotics (3%) were uncommon. Most institutions did not have a formal weaning protocol for IABP (78%) or Impella (66%). The majority of centers reported IABP weaning to be a subjective decision led by the CICU attending (65%), while Impella weaning was commonly a decision made by a multi-disciplinary team including the CICU attending (57%). PACs are used routinely when weaning Impella (83%) but not IABP (46%). IABP removal is most commonly done at bedside by CICU team (70%), whereas Impella removal is most commonly done in the catheterization laboratory (43%). Conclusions In this survey of academic CICUs, IABP and Impella management showed substantial variability across centers. Use of invasive hemodynamic monitoring was common but its use during weaning was not uniform. Multidisciplinary involvement was more common with Impella support and weaning when compared to IABP. These heterogeneous results highlight the need for further investigation to guide best practices in MCS management.

Novel uses for implanted haemodynamic monitoring in adults with subaortic right ventricles

BackgroundPulmonary hypertension (PH) is a common complication in patients with complete dextro-transposition of the great arteries (TGA) after atrial switch (D-TGA/AS) and congenitally corrected TGA (ccTGA). In this population with...

Diastolic blood pressure impact on pediatric refractory septic shock outcomes

Septic shock is the progression of sepsis, defined as cardiovascular dysfunction during systemic infection, and it has a mortality rate of 40%-80%. Loss of vascular tone is an important pathophysiological feature of septic shock. Diastolic blood pressure (DBP) was reported to be associated with vascular tone. This study aimed to identify the associations of several hemodynamic indices, especially DBP, with outcome in pediatric septic shock to allow for timely interventions. Children with persistent catecholamine-resistant shock had a pulse index continuous cardiac output (PiCCO®) system implanted for invasive hemodynamic monitoring and were enrolled in the current study. Serial cardiac index, systemic vascular resistance index (SVRI), systolic blood pressure (SBP), mean arterial pressure (MAP), and DBP were recorded during the first 24h following PiCCO® initiation. All hemodynamic parameters associated with 28-day mortality were further analyzed using receiver operating characteristic curve analysis. Thirty-three children with persistent catecholamine-resistant shock were enrolled. The median age was 12 years and the youngest children were 5 years old. Univariate analysis noted that SVRI, SBP, MAP, and DBP were significantly higher, and shock index was significant lower, in survivors compared with non-survivors (p<0.05). In the multivariate analysis, only SVRI and DBP remained independent predictors of 28-day mortality. DBP had the best correlation with SVRI (r=0.718, n=219, p<0.001). The area under the receiver operating characteristic curves of SVRI and DBP for predicting 28-day mortality during the first 24h of persistent catecholamine-resistant shock were >0.75, indicating a good prediction for mortality. DBP correlated well with SVRI and it can serve as a predictor for mortality in pediatric septic shock. Furthermore, DBP was a superior discriminator of mortality when compared with SBP and MAP. A lower DBP was an independent hemodynamic factor associated with 28-day mortality.

The association of eicosanoids and eicosanoid-related metabolites with pulmonary hypertension.

Eicosanoids are bioactive lipids that regulate systemic inflammation and exert vasoactive effects. Specific eicosanoid metabolites have previously been associated with pulmonary hypertension (PH), yet their role remains incompletely understood. We studied 482 participants with chronic dyspnoea who underwent clinically indicated cardiopulmonary exercise testing (CPET) with invasive haemodynamic monitoring. We performed comprehensive profiling of 888 eicosanoids and eicosanoid-related metabolites using directed non-targeted mass spectrometry, and examined associations with PH (mean pulmonary arterial pressure (mPAP) >20 mmHg), PH subtypes and physiological correlates, including transpulmonary metabolite gradients. Among 482 participants (mean±sd age 56±16 years, 62% women), 200 had rest PH. We found 48 eicosanoids and eicosanoid-related metabolites that were associated with PH. Specifically, prostaglandin (11β-dhk-PGF2α), linoleic acid (12,13-EpOME) and arachidonic acid derivatives (11,12-DiHETrE) were associated with higher odds of PH (false discovery rate q<0.05 for all). By contrast, epoxide (8(9)-EpETE), α-linolenic acid (13(S)-HOTrE(γ)) and lipokine derivatives (12,13-DiHOME) were associated with lower odds. Among PH-related eicosanoids, 14 showed differential transpulmonary metabolite gradients, with directionality suggesting that metabolites associated with lower odds of PH also displayed pulmonary artery uptake. In individuals with exercise PH, eicosanoid profiles were intermediate between no PH and rest PH, with six metabolites that differed between rest and exercise PH. Our findings highlight the role of specific eicosanoids, including linoleic acid and epoxide derivatives, as potential regulators of inflammation in PH. Of note, physiological correlates, including transpulmonary metabolite gradients, may prioritise future studies focused on eicosanoid-related pathways as important contributors to PH pathogenesis.

Cardiac Output and Stroke Volume Assessments by Transthoracic Echocardiography and Pulse index Continuous Cardiac Output Monitor in Critically ill Adult Patients: A Comparative Study.

Bedside transthoracic echocardiography (TTEcho) is a noninvasive cardiac output (CO) monitoring method that has grown recently. However, there are questions regarding its accuracy compared to invasive methods. We aimed to evaluate the agreement and correlation of TTEcho and pulse index continuous CO (PiCCO) monitor measurements for CO and systolic volume (SV) in critically ill patients. This prospective experimental study included consecutive adult patients who required invasive hemodynamic monitoring admitted at an intensive care unit in the Federal District, Brazil, from January/2019 to January/2021. Correlation and agreement between SV and CO measurements by PiCCO and TTEcho were performed using the Spearman correlation and the Bland-Altman analysis. The study enrolled 29 patients, with adequate TTEcho evaluations in all patients. There were very strong correlations between CO-TTEcho and CO-PiCCO (r = 0.845, P < .001) and SV-TTEcho and SV-PiCCO (r = 0.800, P < .001). TTEcho estimations for CO and SV were feasible within the limits of agreement in 96.6% (28/29) compared to PiCCO. The mean difference between CO-PiCCO and CO-TTEcho was 0.250 L/min (limits of agreement: -1.083 to 1.583 L/min, percentage error: 21.0%), and between SV-PiCCO and SV-TTEcho was 2.000 mL (limits of agreement: -16.960 to 20.960, percentage error: 24.3%). The reduced cardiac index (CI) measurements by TTEcho showed an accuracy of 89.7% (95% IC: 72.6%-97.8%) and an F1 score of 92.7% (95% IC: 75.0%-98.0%), considering the CI-PiCCO as the gold standard. Echocardiographic measurements of CO and SV are comparable to measurements by PiCCO. These results reinforce echocardiography as a reliable tool to evaluate hemodynamics in critically ill patients.

Obesity-Related Biomarkers Are Associated With Exercise Intolerance and HFpEF.

Obesity and adiposity are associated with an increased risk of heart failure with preserved ejection fraction (HFpEF); yet, specific underlying mechanisms remain unclear. We sought to examine the association of obesity-related biomarkers including adipokines (leptin, resistin, adiponectin), inflammatory markers (CRP [C-reactive protein], IL-6 [interleukin-6]), and insulin resistance (HOMA-IR) with HFpEF status, exercise capacity, and cardiovascular outcomes. We studied 509 consecutive patients with left ventricular ejection fraction ≥50% and chronic dyspnea, who underwent clinically indicated cardiopulmonary exercise test with invasive hemodynamic monitoring between 2006 and 2017. We defined HFpEF based on the presence of elevated left ventricular filling pressures at rest or during exercise. Fasting blood samples collected at the time of the cardiopulmonary exercise test were used to assay obesity-related biomarkers. We examined the association of log-transformed biomarkers with HFpEF status and exercise traits using multivariable-adjusted logistic regression models. We observed associations of obesity-related biomarkers with measures of impaired exercise capacity including peak VO2 (P≤0.002 for all biomarkers). The largest effect size was seen with leptin, where a 1-SD higher leptin was associated with a 2.35 mL/kg per min lower peak VO2 (β, -2.35±0.19; P<0.001). In addition, specific biomarkers were associated with distinct measures of exercise reserve including blood pressure (homeostatic model assessment of insulin resistance, leptin, adiponectin; P≤0.002 for all), and chronotropic response (CRP, IL-6, homeostatic model assessment of insulin resistance, leptin, and resistin; P<0.05 for all). Our findings suggest that among the obesity-related biomarkers studied, higher levels of leptin and CRP are independently associated with increased odds of HFpEF, with odds ratios of 1.36 (95% CI, 1.09-1.70) and 1.25 (95% CI, 1.03-1.52), respectively. Specific obesity-related pathways including inflammation, adipokine signaling, and insulin resistance may underlie the association of obesity with HFpEF and exercise intolerance.