Significant Changes In Hemodynamic Parameters Research Articles

Changes in perfusion and permeability in glioblastoma model induced by the anti-angiogenic agents cediranib and thalidomide.

The poor delivery of drugs to infiltrating tumor cells contributes to therapeutic failure in glioblastoma. During the early phase of an anti-angiogenic treatment, a remodeling of the tumor vasculature could occur, leading to a more functional vessel network that could enhance drug delivery. However, the restructuration of blood vessels could increase the proportion of normal endothelial cells that could be a barrier for the free diffusion of drugs. The net balance, in favor or not, of a better delivery of compounds during the course of an antiangiogenic treatment remains to be established. This study explored whether cediranib and thalidomide could modulate perfusion and vessel permeability in the brain U87 tumor mouse model. The dynamic evolution of the diffusion of agents outside the tumor core using the fluorescent dye Evans Blue in histology and Gd-DOTA using dynamic contrast-enhanced (DCE)-MRI. CD31 labelling of endothelial cells was used to measure the vascular density. Cediranib and thalidomide effectively reduced tumor size over time. The accessibility of Evans Blue outside the tumor core continuously decreased over time. The vascular density was significantly decreased after treatment while the proportion of normal vessels remained unchanged over time. In contrast to histological studies, DCE-MRI did not tackle any significant change in hemodynamic parameters, in the core or margins of the tumor, whatever the parameter used or the pharmacokinetic model used. While cediranib and thalidomide were effective in decreasing the tumor size, they were ineffective in transiently increasing the delivery of agents in the core and the margins of the tumor.

Central sleep apnea in chronic heart failure with hypoxemia - treatment efficacy and hemodynamic effects of three different treatment modalities: a case report

BackgroundThe optimal treatment for central sleep apnea (CSA) depends on the underlying pathophysiology and should consider the potential for hemodynamic impairment when using positive airway pressure devices. While the long-term effects on overall cardiovascular outcome have been investigated for different device settings, the immediate hemodynamic consequences are not well understood. This is mainly due to a lack of hemodynamic monitoring during routine polysomnographic assessment. The application of most monitoring devices is either restricted by their invasiveness, e.g. in thermodilution, or cannot be used continuously like in echocardiography. Impedance cardiography (ICG), however, enables physicians to implement a continuous non-invasive monitoring of different hemodynamic parameters which can be useful in various clinical scenarios. In sleep medicine, the hemodynamic effect of initiating positive airway pressure treatment in patients with pre-existing heart failure should be of special concern.Case presentationIn this case report, we compare the efficacy of three different treatment modalities in a patient with CSA related to chronic heart failure considering the resolution of respiratory events on polysomnography (PSG). In addition, we outline the hemodynamic effects of each treatment device using ICG for non-invasive hemodynamic monitoring. Regarding the reduction of respiratory central events, long-term oxygen treatment (LTOT) and adaptive servoventilation (ASV) proved to be more efficient compared with automatic positive airway pressure (APAP). Hemodynamically, substantial differences of the cardiac performance were observed between the treatment devices. This especially applied to ASV which led to a pronounced drop in cardiac output.ConclusionOur case report indicates that treatment of CSA may induce significant changes of hemodynamic parameters which would remain undetected during routine polysomnographic assessment. We conclude that non-invasive hemodynamic monitoring may be considered when positive airway pressure treatment is initiated in patients at risk of hemodynamic impairment.

Effectiveness of Segmental Thoracic Spinal Anaesthesia in Breast Surgery: An Observational Study

Effectiveness of Segmental Thoracic Spinal Anaesthesia in Breast Surgery: An Observational Study

Physiological and Anesthetic Considerations of Safe and Optimal Pneumoperitoneal Pressures for Laparoscopic Surgeries in Children.

In the era of minimally invasive surgeries, pediatric laparoscopic surgeries are now becoming the standard of care. In this study, we aim to determine the safe and optimal pneumoperitoneal pressures (PPs) for laparoscopic surgery in children aged 1-5 years, along with the technical ease for the surgeon. Prospective, randomized, single-blinded study was conducted at SGPGI Lucknow. Children aged 1-5 years were randomized into Group I (n = 24): PP = 6-8 mmHg and Group II: (PP) = 9-10 mmHg. Hemodynamic, ventilatory, and blood gas changes were measured before CO2 insufflation (T0), 20 min after insufflation (T1), before desufflation (T2), and 10 min after desufflation (T3). Surgeon's technical ease of surgery, postoperative pain, the requirement of rescue analgesia, time to resume feeding, and complications were recorded and analyzed. Paired t-test, Mann-Whitney test, and Wilcoxon signed-rank test were used for nonparametric/parametric data. Chi-square/Fisher's test was used for nominal data. Partial pressure of CO2 (PaCO2) was significantly higher in Group II at T1, T2, and T3, requiring frequent changes in ventilatory settings. Postoperative pain scores were higher in Group II at 1, 6, and 12 h, requiring rescue analgesia. Surgeon's scores and hemodynamics were similar in both groups. Higher PP in Group II caused significant changes in PaCO2, end-tidal CO2, and postoperative pain requiring rescue analgesia, but blood gas changes were clinically insignificant and there were no significant changes in hemodynamic parameters. Since the surgeon's ease of performing surgery was similar in both groups, we recommend that laparoscopy in children aged 1-5 years can be started with lower PPs of 6-8 mmHg, which can be increased if needed based on the surgeon's comfort and the patient's body habitus.

A comparative study of the efficacy of intravenous magnesium sulphate and intravenous dexmedetomidine in attenuating haemodynamic response to laryngoscopy and endotracheal intubation

Both laryngoscopy and tracheal intubation elicit a sympathetic and parasympathetic response, which varies depending on the depth of anaesthesia, duration of laryngoscopy, and patient characteristics. Although different methods have been used to suppress the response, an ideal agent has yet to be discovered. This study compares and contrasts the effectiveness of intravenous dexmedetomidine and intravenous magnesium sulphate in reducing hemodynamic response during laryngoscopy and endotracheal intubation.: This 18-month prospective, randomised, double-blind, placebo-controlled comparative research was conducted in the Department of Anaesthesiology and Critical Care, Bokaro General Hospital, Bokaro Steel City, Jharkhand. One hundred twenty consenting study participants were randomly divided into three groups of forty. Before induction, Group A received IV normal saline as a placebo. Group B received 1 mcg/kg IV dexmedetomidine before induction, while Group C received 30 mg/kg IV 50% magnesium sulphate before induction.: Gender distribution was consistent and equal among 120 patients. Gender, age, weight, ASA, and type of surgery did not differ significantly across groups. The three groups had no statistically significant difference in baseline hemodynamic parameters. When compared to the Control Group (A), there were statistically significant changes in hemodynamic parameters in the Dexmedetomidine (B) and Magnesium sulphate (C) groups. There was no hypotension, bradycardia, nausea, vomiting, dry mouth, or arrhythmias.: Dexmedetomidine and magnesium sulphate efficiently reduced the hemodynamic stress response to laryngoscopy and intubation, although dexmedetomidine attenuated the sympathetic response more effectively.

Study on Perioperative Management of Blood Pressure and Effects of Anaesthesia in Hypertensive Patients Undergoing General & Orthopaedic Surgery

Background and Aim: During anesthesia, hypertension is the most common additional risk factor that contributes to higher mortality rate. Antihypertension medicine’s withdrawal might leads to symptoms such as anxiety, rebound hypertension, myocardial infarction, tachyarrhythmia, angina exaggeration, and sudden death. The present study aimed to assess the perioperative management of blood pressure and effects of anesthesia in hypertensive patients undergoing general and orthopedic surgery. Patients and Methods: This cross-sectional study was carried out on 162 hypertensive patients in the General Surgery and Orthopedics Units of Khyber Teaching Hospital, Peshawar for the duration from April 2022 to September 2022. Study protocol was approved by institute ethical committee. Patients aged 16 to 70 years of either gender underwent general surgery and orthopaedic surgery were enrolled. The data was acquired during the anesthetist’s initial visit to the operated hypertensive patients' 24 hour postoperative period. Antihypertensive medications, hemodynamics, anesthesia drugs, fluid use, and blood loss were main variables noted. Heart rate, systolic blood pressure, and diastolic blood pressure were Intraoperative hemodynamics. SPSS version 27 was used for data analysis. Results: Of the total 162 hypertensive patients, there were 68 (42%) male and 94 (58%) females. The overall mean age was 58.62±8.4 years. Before surgery, about 119 (73.5%) patients took antihypertensive medication whereas 124 (76.5%) had antihypertensive medication within 24 hours. The most prevalent antihypertensive medication used and most common class during postoperative management was Calcium channel Blockers and Amlodipine. The most prevalent used anesthetic drug use was Bupivacaine. The incidence of Systolic Blood Pressure (SBP) fall and rise was found in 28 and 6 patients respectively. The incidence of Diastolic Blood Pressure (DBP) fall and rise during intraoperative management was 11 and 8 patient respectively. Conclusion: The present study found that a decreased heart rate in patients who were taking beta blockers consistently. Those who took diuretics had greater DBP and HR at the completion of the procedure. There was no significant change in hemodynamic parameters with any other antihypertensive treatment. Keywords: Hypertension, General Surgery, Orthopaedic, Hemodynamics

Comparison Between Volume Controlled Ventilation and Pressure Controlled Ventilation in Laparoscopic Cholecystectomy and their Effects on Hemodynamic and Respiratory Parameters

Background: Laparoscopic cholecystectomy is a minimally invasive surgical technique for amputation of anunhealthy gallbladder. This procedure has several advantages including shorter stay in hospital, minimal postoperativepain and fast recovery after procedure. The disadvantages of this procedure due to increase intraabdominalpressure, patient position and general anesthesia. Many of anesthetist apply VCV in this procedure.VCV can deliver adequate minute volume but this is corresponded by an increase in airway pressure, so otheralternative mode can be used to solve this problem like PCV.Aim of the Study: To compare effect of volume controlled ventilation versus pressure controlled ventilation onrespiratory and haemodynamic parameters during laproscopic cholycystectomy.Patients and method: A prospective comparative observational study, conducted at the Department of generalsurgery in Baghdad Teaching Hospital/Medical city complex, from October 2019 - October 2020. Fifty participantsunderwent laparoscopic cholecystectomy within the inclusion criteria were included in the present study. Eachgroup consist of 25 patients .one group received VCV and others receive PCV. peak airway pressure, mean airwaypressure, MAP, and heart rate was recorded intraoperatively at 5,10 and 30 minute intervals. The collected datawere analyzed by SSPS version 22 program.Results: In pressure control group of patients, the peak airway pressure was significantly deceased after 10 and30minutes after start of laparoscopy (20.2and 20.8) versus (24.3 and 24.1) respectively and mean airway pressurewas significantly increased after same time (10.6 and10.6) versus (9.7 and 9.7) respectively relative to volumecontrol group. No significant change in hemodynamic parameters. Conclusion: PCV mode is a safe alternative &offers protection to the lungs but there was no beneficial effect of PCV regarding mean airway pressures whichreflect oxygenation, minute ventilation &ETCO2.

Motion-corrected 4D-Flow MRI for neurovascular applications

Neurovascular 4D-Flow MRI has emerged as a powerful tool for comprehensive cerebrovascular hemodynamic characterization. Clinical studies in at risk populations such as aging adults indicate hemodynamic markers can be confounded by motion-induced bias. This study develops and characterizes a high fidelity 3D self-navigation approach for retrospective rigid motion correction of neurovascular 4D-Flow data. A 3D radial trajectory with pseudorandom ordering was combined with a multi-resolution low rank regularization approach to enable high spatiotemporal resolution self-navigators from extremely undersampled data. Phantom and volunteer experiments were performed at 3.0T to evaluate the ability to correct for different amounts of induced motions. In addition, the approach was applied to clinical-research exams from ongoing aging studies to characterize performance in the clinical setting. Simulations, phantom and volunteer experiments with motion correction produced images with increased vessel conspicuity, reduced image blurring, and decreased variability in quantitative measures. Clinical exams revealed significant changes in hemodynamic parameters including blood flow rates, flow pulsatility index, and lumen areas after motion correction in probed cerebral arteries (Flow: P<0.001 Lt ICA, P=0.002 Rt ICA, P=0.004 Lt MCA, P=0.004 Rt MCA; Area: P<0.001 Lt ICA, P<0.001 Rt ICA, P=0.004 Lt MCA, P=0.004 Rt MCA; flow pulsatility index: P=0.042 Rt ICA, P=0.002 Lt MCA). Motion induced bias can lead to significant overestimation of hemodynamic markers in cerebral arteries. The proposed method reduces measurement bias from rigid motion in neurovascular 4D-Flow MRI in challenging populations such as aging adults.

The Effect of Aminophylline on Urine Output and Fluid Balance after a Single Dose in Children Admitted to the Pediatric Cardiac Intensive Care Unit

AbstractThe purpose of this retrospective study was to investigate the effects of a single dose of aminophylline on urine output and fluid balance in children admitted to the cardiac intensive care unit. A retrospective study was performed to compare variables of interest before and 24 hours after aminophylline administration in children under the age of 18 years who were admitted to the cardiac intensive care unit at our institution from January 2011 onwards. Variables of interest included age, weight, aminophylline dose, concurrently administered diuretics, specific hemodynamic parameters, and blood urea nitrogen and creatinine levels. Variables such as urine output and fluid balance were measured through a binary endpoint. Data were compared in a paired fashion and continuous variables were compared through paired t-tests. Analyses were conducted using SPSS Version 23.0. A total of 14 patients were included in the study. There was no significant change in hemodynamic parameters or creatinine levels before and after intravenous aminophylline administration of 5 mg/kg. There was a significant difference in urine output, fluid balance, and blood urea nitrogen levels from the baseline value. Concurrent usage of diuretics did not show significant association with a difference in urine output or fluid balance from baseline. No significant adverse reactions were noted 24 hours after administration of aminophylline. Use of aminophylline dosed at 5 mg/kg is safe and leads to improvement in urine output and fluid balance without negatively impacting systemic oxygen delivery or renal filtration function.

Impact of lateral positioning on oxygenation in noninvasively ventilated COVID-19 patient

Background: Due to the sudden outbreak of covid 19, we lost almost 6230357 deaths till date. Covid 19 causes hypoxemia. As we know, body positions can improve oxygenation by various physiological changes. Many literatures showed prone position improved oxygenation in covid19 patients. So, we want to explore whether lateral position improves oxygenation status in covid19 infected noninvasively ventilated patients during first wave of covid19 pandemic. Objectives: Aim of this prospective observational study to evaluate the impact of lateral position on oxygenation in non-invasively ventilated covid 19 patients. Methods: we enrolled non-invasively ventilated covid 19 patients from 18 years to 70 years of age and hemodynamically stable patients who were in supine position but planned to give lateral position by ICU consultant. We noted hemodynamic, oxygenation status and ABGA parameter after one hour of lateral positioning. Results: Out of 100 patients, 67 were male and 33 were female. 31 patients had Diabetes as a comorbidity, 35 patients had hypertension. Out of 3 patients, 4 had IHD and 3 had hypothyroidism. SpO2 by pulse oximetry, SO2 and PO2 from ABGA showed statistically significant increase after one hour of lateral positioning. There were no significant changes in hemodynamic parameters after lateral positioning.

Comparative study of bupivacaine-lignocaine to bupivacaine-lignocaine-dexamethasone in providing postoperative analgesia in interscalene block for shoulder arthroscopy

Interscalene brachial plexus block has gained prominence nowadays and has benefits of lesser intraoperative anaesthetic use, lesser analgesic requirement and lesser incidence of postoperative nausea and vomiting. Adjuvants are added to local anaesthetics for prolonging postoperative analgesia with interscalene block. Among the adjuvants, dexamethasone has been used extensively in past decade in neuraxial and peripheral nerve blocks. The aim of the study was to compare the duration of postoperative analgesia with lignocaine- bupivacaine combination and dexamethasone added to lignocaine - bupivacaine in interscalene block for shoulder arthroscopy. In this comparative study, 48 patients of ASA grade I and II were selected and divided into 2 groups of 24 each. After obtaining informed written consent, general anaesthesia was given to patients satisfying inclusion criteria and ultrasound guided interscalene block was performed. Time of demand for additional analgesic supplementation by the patient were noted. Hemodynamic and respiratory monitoring were done to assess any side effects and complications.Duration of analgesia was prolonged in group II (10.33±1.45 hours) i.e in lignocaine-bupivacaine-dexamethasone group than Group I(7.17±0.87 hours) i.e in lignocaine-bupivacaine group with p value less than 0.001. There were no significant differences between the two groups in secondary outcomesbased on hemodynamic parameters. Dexamethasone at a dose of 8 mg in addition to lignocaine-bupivacaine, given perineurally in interscalene block provided better quality of block and prolonged duration of analgesia by almost 3 hours, without any significant changes in hemodynamic parameters. There were no major adverse effects noted.

Continuous transthoracic echocardiographic monitoring for changes in maternal cardiac hemodynamics during cesarean section under combined epidural-spinal anesthesia: a prospective, observational study.

The change in maternal hemodynamics during cesarean section has not been well studied. Continuous transthoracic echocardiography can monitor cardiac function continuously. This study aimed to evaluate the effectiveness of maternal hemodynamic parameters monitoring during cesarean section using continuous transthoracic echocardiography. In this prospective, observational study, women with an uncomplicated singleton pregnancy scheduled for elective cesarean section at term under combined spinal-epidural anesthesia were enrolled. Maternal hemodynamic parameters were assessed by continuous transthoracic echocardiography at 11 pre-set time points. The image quality of continuous transthoracic echocardiography was evaluated before measurement was performed. Totally, one hundred parturients were recruited, and transthoracic echocardiography images with sufficient quality for further analysis were obtained in 72 women. Following anesthesia, maternal heart rate decreased by 11.18% and cardiac output decreased by 7.82%, but stroke volume remained stable. After delivery of the neonate and placenta, stroke volume and cardiac output increased by 21.09% and 22.33%, respectively. End-diastolic volume also increased significantly after delivery of the neonate, but end-systolic volume was unchanged. Following delivery of the neonate, fractional shortening increased till the end of the cesarean section while total peripheral resistance decreased significantly. In conclusion, continuous transthoracic echocardiographic monitoring revealed that there were significant changes in hemodynamic parameters during cesarean section after delivery of the newborn and placenta, which warranted further investigation.

Вплив ранолазину на перебіг ішемічної хвороби серця після черезшкірного коронарного втручання

Optimization of antiischemic therapy is necessary in many patients with stable forms of coronary heart disease after or during revascularization. From the standpoint of current guidelines, the addition of second-line drugs, in particular ranolazine, to beta-blockers and/or calcium antagonists is considered during anginal attacks due to incomplete revascularization, to prevent myocardial damage during percutaneous coronary interventions, and in cases when revascularization is not possible. The results of many clinical studies have proven the antiischemic effect and safety of ranolazine after coronary artery stenting. Potential advantages of ranolazine compared with other second-line antianginal drugs are the absence of significant changes in hemodynamic parameters, good tolerability and proven antiarrhythmic effects. Key words: chronic ischemic heart disease, percutaneous coronary intervention, ranolazine.

Changes in Arterial Blood Pressure and Oxygen Tension as a Result of Hoisting in Isoflurane Anesthetized Healthy Adult Horses.

Background: In anesthetized adult horses, changes in recumbency can influence the cardiovascular system but how arterial blood pressures and oxygen tension change in isoflurane anesthetized animals as a direct result of hoisting has not been investigated.Objective: To evaluate effects of hoisting on hemodynamic function and pulmonary gas exchange in isoflurane-anesthetized horses.Study Design: Prospective, experimental study.Methods: Six adult horses were anesthetized three times using isoflurane in pure oxygen (inspired fraction 0.9–1.0), and allowed breathing spontaneously in lateral recumbency. After 45 min horses were hoisted using a single hoist-hobble system for 5 min and returned into left lateral recumbency. Heart rate (HR), respiratory rate (RR), and systolic (SAP), diastolic (DAP), and mean arterial blood pressures (MAP) were measured every minute starting from 5 min before to 5 min after hoisting. Arterial blood gas samples were collected before, during, and after hoisting.Results: Significant changes in hemodynamic parameters and PaO2 but not PaCO2 were found between baseline recordings and measurements obtained during and early after hoisting. The MAP decreased within the 1st min of hoisting from a mean of 74 ± 17 mmHg at baseline to 57 ± 20 mmHg (p < 0.05). Thereafter, it rapidly recovered to baseline before continuing to rise to higher than baseline values and then remaining elevated for 5 min after horses were returned into lateral recumbency. Simultaneously, the HR increased by 6–9 beats per min during the initial 3 min of hoisting before returning close to baseline values (p < 0.05). The PaO2 decreased significantly from a mean of 324.9 ±137.0 mmHg at baseline to a mean of 141.3 ± 104.2 mmHg during hoisting (p < 0.001) without recovering any more to baseline values.Clinical significance: Hoisting an adult horse during or at the end of isoflurane anesthesia carries the risk of a precipitous, though short-lived (1–2 min), drop in arterial blood pressures and a persistent decrease in arterial oxygenation. While in systemically healthy animals the observed functional impairments were not life-threatening, they may be more severe in systemically compromised horses.Therefore, arterial blood pressures and oxygenation must be carefully monitored when hoisting sick equine patients during or at the end of inhalant anesthesia.

Abstract 14553: Mitochondrial Calcium Uptake via Mitochondrial Calcium Uniporter Suppress Ventricular Arrhythmia in the Ischemic Heart Failure Mice

Background: Delayed after depolarization by calcium (Ca 2+ ) leak from sarcoplasmic reticulum (SR) via Ryanodine receptor is one of the causes of ventricular arrhythmias (VAs) in heart failure (HF). Ca 2+ uptake into mitochondria via mitochondrial calcium uniporter (MCU) is participated in Ca 2+ handling, but the relationship between VAs in HF and Ca 2+ uptake into mitochondria is unclear. Purpose: We sought to investigate whether increased Ca 2+ uptake into mitochondria via MCU reduces diastolic Ca 2+ leak and suppresses VAs in ischemic HF mice. Methods: Ten-week-old male C57BL/6J mice were divided into 2 groups; sham operation mice (Sham) or HF mice (HF) in which myocardial infarction was induced by left coronary artery ligation. After 4-6 weeks, cardiomyocyte or mitochondria were isolated respectively from the myocardium of Sham and the non-infarct myocardium of HF. Ca 2+ waves (CaWs) were measured on an epifluorescence microscopy. Calcium transients and calcium sparks were measured on a confocal microscope in linescan mode. Mitochondrial Ca 2+ uptake were measured by estimating the extra-mitochondrial Ca 2+ reduction with Fluo-5N on a spectrofluoro-photometer. VAs was induced in the Langendorff perfused hearts. Left ventricular (LV) pressure was measured using a microtip transducer catheter . Results: HF mice showed left ventricular dysfunction and increased heart and lung weights compared to Sham. Kaempferol, a MCU activator, increased mitochondrial Ca 2+ uptake in the isolated mitochondria both in Sham and HF. CaWs and Ca spark frequency in the presence of isoproterenol was attenuated by 10 μM Kaempferol. Kaempferol did not show significant changes in Ca 2+ transient amplitude, however increased the time to 50% decay significantly. The incidence of induced VAs was suppressed by Kaempferol. In vivo measurements, intravenous administration of Kaempferol (5mg/kg) did not show significant changes in hemodynamic parameters in HF mice. Conclusions: Ca 2+ uptake into mitochondria via MCU suppresses VAs in HF. Despite the adverse influence of the traditional antiarrhythmic drugs for HF condition, a novel strategy that promotes Ca 2+ uptake into mitochondria might be a potential therapeutic approach for VA treatment in HF patients.

Transcervical minimally invasive esophagectomy: hemodynamic study on an animal model.

BackgroundTranscervical esophagectomy is a less invasive procedure performed within mediastinum. However, the mediastinum offers limited surgical space and the surgery via this route differs from conventional minimally invasive esophagectomy. Therefore, the physiological study of this surgical approach on an animal model would be necessary before the procedure gained more popularity.MethodsWe conducted transcervical minimally invasive esophagectomy on animal model (swine) under CO2 pneumomediastinum. The hemodynamic parameters were monitored using float catheter cannulated via right jugular vein. At different anatomical level (the upper, middle, and lower thoracic part of the animal esophagus), increased artificial pneumomediastinal pressures (0, 4, 8, 12, and 16 mmHg) were consecutively allocated to record the intra-operative changes of blood pressure, cardiac output (CO), central venous pressure (CVP), pulmonary artery pressure (PAP) and extravascular lung water (EVLW). Meanwhile, the surgical field under different pneumomediastinum pressure was recorded and balanced with animals’ hemodynamic changes to determine the optimal pressure for transcervical minimally invasive esophagectomy.ResultsThe animal procedures were accomplished without conversions. During the upper thoracic stage, increased CO2 pressures did not lead to significant changes in hemodynamic parameters including the blood pressure, CO, CVP, PAP or the level of EVLW. During the middle thoracic stage, pneumomediastinum under 4–12 mmHg did not lead to significant changes in hemodynamic parameters. However, pneumomediastinum at 16 mmHg resulted in lower CO (P=0.038) when compared to 0–12 mmHg. During lower thoracic stage, as the pneumomediastinum pressures increased from 0 to 16 mmHg, significant decrease in CO (P=0.022), and increase in CVP (P=0.036) was recorded. In compared to 4 mmHg pneumomediastinum, the surgical field under 8–16 mmHg artificial CO2 pneumomediastinum was suitable for mediastinal manipulation.ConclusionsDuring transcervical minimally invasive esophagectomy on animal model, the mobilization of swine thoracic esophagus with optimal pneumomediastinum pressure 8–12 mmHg is safe and effective based on hemodynamic analysis.

Suppression of ventricular arrhythmia by mitochondrial calcium uptake via mitochondrial calcium uniporter in the ischemic heart failure mice

Abstract Background In heart failure (HF), diastolic calcium (Ca) leak from sarcoplasmic reticulum (SR) via ryanodine receptor (RyR) causes delayed after depolarization (DAD), leading ventricular arrhythmias (VAs). Recent study reported that Ca uptake into mitochondria via mitochondrial calcium uniporter (MCU) suppress Ca waves (CaWs) and DAD in catecholaminergic polymorphic ventricular tachycardia, in which diastolic Ca leak is thought to be a major cause of VAs as in HF. However, such anti-arrhythmic effect of mitochondrial Ca uptake via MCU remains unclear in HF. Purpose We sought to investigate whether mitochondrial Ca uptake via MCU decreases CAWs and VAs incidence in ischemic HF mice. Methods Ten-week-old male C57BL/6J mice were divided into 2 groups; sham operation mice (Sham) or HF mice (HF) in which myocardial infarction was induced by left coronary artery ligation. After 4–6 weeks, cardiomyocyte or mitochondria was isolated respectively from the myocardium of Sham and the non-infarct myocardium of HF. Influence of MCU activation on Ca dynamics, VA inducibility and left ventricular hemodynamics were evaluated using Kaemenpferol, a MCU activator. Intracellular Ca dynamics and mitochondrial Ca uptake were measured in isolated cardiomyocytes loaded with Fluo-4 AM on an epifluorescence microscopy and by estimating the extra-mitochondrial Ca reduction with Fluo-5N on a spectrofluoro-photometer, respectively. VAs was induced by programmed stimulation in the Langendorff perfused hearts. Left ventricular (LV) pressure was measured using a microtip transducer catheter. Finally, the effect of intravenous administration of Kaempferol (5mg/kg) on hemodynamic parameters was examined 30 minutes after administration in Sham and HF. Results HF mice showed left ventricular dysfunction, as well as the increased heart and lung weights compared to Sham. MCU protein expression in cardiomyocytes did not differ between Sham and HF. Kaempferol increased mitochondrial Ca uptake in the isolated mitochondria both in Sham and HF. The number of the diastolic CaWs was higher in HF compared to Sham. Such increased number of CaWs in HF was attenuated by 10 μM Kaempferol, which was, however, abolished by a MCU blocker Ruthenium Red. The incidence of induced VA was significantly higher in HF than Sham, which was suppressed by Kaempferol. In vivo measurements, intravenous administration of Kaempferol did not show significant changes in hemodynamic parameters in Sham and HF mice. Conclusions Mitochondrial Ca uptake via MCU suppresses CaWs and VAs, but did not change LV hemodynamics in HF. Whereas traditional antiarrhythmic drugs have limited use in heart failure patients, a novel strategy that promotes Ca uptake into mitochondria might be a new and safer option for treating VAs in HF. Funding Acknowledgement Type of funding source: None

Efficiency and safety of peripheral regional anesthesia application in urgent traumatology

In Ukraine, more than 4.5 million people sustain injuries of varying severity annually, and damage to extremities constitutes 60–65 % in the structure of traumatism. Patients with traumatic limb injuries require effective anesthesia / analgesia at an early stage. An urgent anesthesia should provide a sufficient relaxation of the extremity, adequate operative and postoperative pain management and should be safe for patients of different age groups. Peripheral regional anesthesia meets the requirements indicated, but there are a number of outstanding issues: difficulties in identifying plexuses and nerves, high rate of complications. Neither a larger injection volume of local anesthetic nor plexuses and nerves identification using a neurostimulator solves the problem completely. At the same time, ultrasound-guided nerve block does not have the weaknesses mentioned and its use is increasingly covered in literature. The purpose of this work is to analyze the effectiveness and safety of the ultrasound-guided nerve block of the extremities in urgent traumatology. Material and methods. Cases of isolated mechanical traumatic injuries of the limbs in patients who were at the clinical base of the Department of Disaster Medicine, Military Medicine, Anesthesiology and Intensive Care of Zaporizhzhia State Medical University from 2016 to 2018 were analyzed. The average age of the trauma patients was 62.5 (47.0; 82.5) years with a body weight of 78.7 (64.3; 94.6) kg. All the patients underwent ultrasound-guided nerve block using an ultrasound device Logiq E with a standard 12 MHz linear array transducer or the “classical” method (anatomical landmark and paraesthesia technique of plexus location). Anesthesia was performed with 0.5 % bupivacaine at a dose of 1–2 mg/kg. Analgesia was performed with a solution of propofol at 1.5–2.0 mg/kg /h with the addition of ketamine at 1–2 mg/kg/h in case of need. The level of analgesia was evaluated on the Ramsay sedation scale. The study analyzed the duration of plexus and nerves location, block onset time, the duration of motor and sensory block; hemodynamics monitoring with the help of UM-300 monitor at the study stages; complications were recorded. Statistical analysis of the data included descriptive statistics methods. When the values did not follow a normal distribution, these data were expressed as a median (lower quartile; higher quartile). Mann-Whitney U test was used to compare variables; the categorical data were analyzed by Chi-square test with Yates correction and Fischer's exact test. In all statistical calculations, P < 0.05 was the level of significance. Data processing was performed using Statistica 10.0 software. Results . The ultrasound-guided method of plexus and nerves location was faster than the “classical” method by paresthesia (3.8 (2.8; 4.3) min and 7.2 (4.2; 9.4) min, respectively; P = 0.001). But the method of plexus and nerves location did not influence the block onset time and the motor and sensory block duration. However, the level of analgesia in patients with ultrasound-guided nerve block (according to the Ramsay sedation scale) at the III and IV study stages was lower than in those with the “classical” method by paresthesia (3.2 (2.4; 3.7 ) and 5.4 (3.8; 5.7) points, respectively; P = 0.027), indicating a greater efficiency of ultrasound-guided plexus and nerve sensory block. The absence of statistically significant changes in hemodynamic parameters at the study stages indicated an effective intraoperative analgesia in patients with ultrasound-guided nerve block which was complicated in 6 cases (6.0 %). But the “classical” method of plexus and nerve block by paresthesia was complicated in 16 cases (32.0 %). Therefore, the ultrasound-guided method of plexus and nerve block was safer. Thus, it can be concluded that ultrasound-guided location of plexuses and nerves was faster than paresthesia method (3.8 (2.8; 4.3) min and 7.2 (4.2; 9.4) min, respectively; P = 0.001) in urgent traumatology. The sensory block in patients according to the analgesia level on the Ramsay sedation scale at the III and IV study stages was lower as compared to the “classical” method by paresthesia (3.2 (2.4; 3.7) and 5,4 (3.8; 5,7) points, respectively, indicating a more effective ultrasound-guided block of plexuses and nerves. Ultrasound-guided block was effective for intraoperative analgesia based on hemodynamic parameters in urgent traumatology. The method of ultrasound-guided block of plexuses and nerves was safer (6.0 % of complications versus 32.0 % when using the “classical” method by paresthesia).

Comparison of efficacy and safety of preemptive infusion protocols of ephedrine and phenylephrine - prevention of hypotension and effects on hemodynamic parameters during spinal anesthesia for caesarean section

Introduction/Objective. Spinal anesthesia (SA) for cesarean section may lead to significant changes in hemodynamic parameters, especially hypotension. The aim of this study was to determine and compare the efficacy and safety of preemptive infusion protocols of the two most commonly used vasopressors, ephedrine (Group E, n = 29) and phenylephrine (Group P, n = 31) not only on prevention of hypotension but also to determine their effect on hemodynamic parameters, such as stroke volume (SV) and cardiac output (CO) using a continuous non-invasive hemodynamic monitor. Methods. The infusion of ephedrine was administered at the rate of 5 mg/min. immediately after SA. Phenylephrine was administered at an infusion rate of 25 ?g/min for two minutes prior to SA. Results. In Group E, mean systolic blood pressure (SBP) and heart rate (HR) were similar to baseline. CO was higher (p &lt; 0.001), while systemic vascular resistance (SVR) was lower than baseline (p &lt; 0.001). In Group P, mean SBP and diastolic blood pressure (DBP) were lower than baseline, respectively (p = 0.006, p &lt; 0.001). SBP, DBP, CO, SV, SVR, and HR were significantly different between the E and P groups (p &lt; 0.001). Conclusion. E and P vasopressors are both effective in the prevention of hypotension during SA.

Icariin attenuates isoproterenol-induced cardiac toxicity in Wistar rats via modulating cGMP level and NF-κB signaling cascade.

Icariin, a major component of Epimedium species, was evaluated using isoproterenol (ISO)-induced cardiotoxicity in Wistar rats. Rats were treated with icariin at the doses of 1, 5, and 10 mg kg-1 orally for 15 days. Afterward, rats were administered with ISO (85 mg kg-1, subcutaneous) on 14th and 15th day to produce cardiac injury. Sildenafil (0.7 mg kg-1, intraperitoneal) was used as a positive reference to compare the effects of icariin. ISO-treated rats showed significant changes in hemodynamic parameters. Elevated levels of cardiac troponin T, nitric oxide, and tumor necrosis factor-alpha in serum, positive expression of nuclear factor-kappa B (NF-κB) and inducible nitric oxide synthase in cardiac tissue, and a decrease in serum level of interleukin-10, manifested inflammation and associated cardiac injury. However, pretreatment with icariin and sildenafil significantly prevented the hemodynamic fall and showed improved contractile and lusitropic states. Furthermore, pretreatment groups also showed a reversal of other toxicity markers to normal. Additionally, pretreatment with icariin and sildenafil significantly increased the myocardial cyclic guanosine monophosphate (cGMP) levels. Our results thus indicated the potential role of icariin in the restoration of the ISO-induced cardiac toxicity and restored membrane integrity through modulation of cGMP and NF-κB signaling.