Intraoperative Blood Pressure Lability Acts as a Key Mediator in the Impacts of Goal-Directed Fluid Therapy on Postoperative Complications in Patients Undergoing Major Spine Surgery

Objective Although goal-directed fluid therapy(GDFT)has been proven to be effective in reducing the incidence of postoperative complications,the underlying mechanisms remain unknown.The aim of this study was to examine the mediating role of intraoperative hemodynamic lability in the association between GDFT and the incidence of postoperative complications.We further tested the role of this mediation effect using mean arterial pressure,a hemodynamic indicator.Methods This secondary analysis used the dataset of a completed nonrandomized controlled study to investigate the effect of GDFT on the incidence of postoperative complications in patients undergoing posterior spine arthrodesis.We used a simple mediation model to test whether there was a mediation effect of average real variability between the association of GDFT and postoperative complications.We conducted mediation analysis using the mediation package in R(version 3.1.2),based on 5,000 bootstrapped samples,adjusting for covariates.Results Among the 300 patients in the study,40%(120/300)developed postoperative complications within 30 days.GDFT was associated with fewer 30-day postoperative complications after adjustment for confounders(odds ratio:0.460,95%CI:0.278,0.761;P=0.003).The total effect of GDFT on postoperative complications was-0.18(95%CI:-0.28,-0.07;P<0.01).The average causal mediation effect was-0.08(95%CI:-0.15,-0.04;P<0.01).The average direct effect was-0.09(95%CI:-0.20,0.03;P=0.17).The proportion mediated was 49.9%(95%CI:18.3%,140.0%).Conclusions The intraoperative blood pressure lability mediates the relationship between GDFT and the incidence of postoperative complications.Future research is needed to clarify whether actively reducing intraoperative blood pressure lability can prevent postoperative complications.

Goal-directed fluid therapy in gastrointestinal cancer surgery:A prospective randomized study

Objective:To investigate the effects of perioperative goal-directed fluid therapy(GDFT)on intraoperative fluid balance,postoperative morbidity,and mortality.Methods:This is a prospective randomized study,and 90 patients who underwent elective open gastrointestinal cancer surgery between April 2017 and May 2018 were included.Patients were randomized into 2 groups that received liberal fluid therapy(the LFT group,n=45)and goal-directed fluid therapy(the GDFT group,n=45).Patients’Colorectal Physiologic and Operative Severity Score for the enUmeration of Mortality and Morbidity(CR-POSSUM)physiological score,Charlson Comorbidity Index(CCI),perioperative vasopressor and inotrope use,postoperative AKIN classification,postoperative intensive care unit(ICU)hospitalization,hospital stay,and 30-day mortality were recorded.Results:The volume of crystalloid used perioperatively and the total volume of fluid were significantly lower in the GDFT group compared to the LFT group(P<0.05).CR-POSSUM physiological score and CCI were significantly higher in the GDFT group(P<0.05).Although perioperative vasopressor and inotrope use was significantly higher in the GDFT group(P<0.05),postoperative acute kidney injury development was not affected.Postoperative mortality was determined to be similar in both groups(P>0.05).Conclusion:Although GDFT was demonstrated to be a good alternative method to LFT in open gastrointestinal cancer surgery,and it can prevent perioperative fluid overload,and the postoperative results are comparable in the two groups.

Effect of perioperative fluid therapy on early phase prognosis after liver transplantation

BACKGROUND: Although liver transplantation (LT) has made rapid progress, early pulmonary complications still occur. More attention should be paid to fluid therapy that may be an important factor leading to these complications. It is necessary to investigate the correlation between intraoperative and postoperative fluid therapy and early pulmonary complications after LT, then attempt to provide a reasonable fluid therapy in the perioperative period. METHODS: Sixty-two patients who had undergone Ff were enrolled and analyzed retrospectively. Based on early phase prognosis after LT, the 62 patients were divided into a non-pulmonary complication group and a pulmonary complication group. Twenty perioperative variables were analyzed in both groups to screen out several factors causing early pulmonary complications, then the parameters reflecting postoperative recovery were analyzed. RESULTS: The pulmonary complication group had 29 patients (46.77%), 3 (4.84%) of whom died during the perioperative period. Using monofactorial analysis for each variable, the two groups differed in the following variables: preoperative lung function, volume of intraoperative transfusion, volume of intraoperative bleeding, and volume of intraoperative net fluid retention and fluid balance (<=-500 ml) in >= 2 of the first 3 days after operation. Analysis of the relationship between multivariate factors and pulmonary complications after LT by logistic multivariate regression analysis showed that preoperative lung function, volume of intraoperative bleeding, and fluid balance (<=-500 ml) in >=-2 of the first 3 days after operation were influential factors. CONCLUSIONS: It is important to maintain fluid balance during the perioperative period of LT. If the hemodynamics are stable, appropriate negative fluid balance in the first 3 days after operation apparently decreases the incidence of early pulmonary complications after LT. These measures are associated with better postoperative recovery.

Effect of Goal-Directed Fluid Therapy on Lung Function, Cognitive Function and Inflammatory Response in Patients Undergoing Radical Esophageal Cancer Surgery under One-Lung Ventilation

Objective: To explore the effects of goal-directed fluid therapy (GDFT) on lung function, cognitive function and inflammatory response in patients undergoing radical esophageal cancer surgery under one-lung ventilation. Methods: Sixty-seven patients undergoing radical esophageal cancer surgery were divided into GDFT group (GDFT therapy) and control group (conventional liquid therapy). The changes in patients’ pulmonary function, cognitive function and inflammatory response were evaluated. Results: Both alveolar-arterial oxygen partial pressure difference [P(A-a)O2] and respiratory index (RI) increased at one-lung ventilation for 30 minutes (T2) and decreased at one-lung ventilation for 60 minutes (T3), and after surgery (T4) in the two groups, and the GDFT group was lower than the control group (P < 0.05);theoxygenation index (OI) of the two groups decreased at T2, T3, and T4 compared with that at T1 (before one-lung ventilation), and the GDFT group was higher than the control group (P < 0.05). At T4 and T5, the tumor necrosis factor α (TNF-α), interleukin 6 (IL-6), central nervous system specific protein (S100β), and neuron specific enolase (NSE) in the GDFT group were lower compared to the control group (P < 0.05), while interleukin-10 (IL-10) was higher compared to the control group (P < 0.05);the incidence of perioperative neurocognitive disorder (PND) in the GDFT group was lower than that in the control group (P < 0.05). Conclusion: GDFT can help prevent lung injury during radical esophageal cancer surgery under one-lung ventilation, reduce the body’s inflammatory response, and reduce the incidence of perioperative cognitive disorder to a certain extent.

Effect of inferior vena cava respiratory variability-guided fluid therapy after laparoscopic hepatectomy:a randomized controlled clinical trial

Background:After major liver resection,the volume status of patients is still undetermined.However,few concerns have been raised about postoperative fluid management.We aimed to compare gut function recovery and short-term prognosis of the patients after laparoscopic liver resection(LLR)with or without inferior vena cava(IVC)respiratory variability-directed fluid therapy in the anesthesia intensive care unit(AICU).Methods:This randomized controlled clinical trial enrolled 70 patients undergoing LLR.The IVC respiratory variability was used to optimize fluid management of the intervention group in AICU,while the standard practice of fluid management was used for the control group.The primary outcome was the time to flatus after surgery.The secondary outcomes included other indicators of gut function recovery after surgery,postoperative length of hospital stay(LOS),liver and kidney function,the severity of oxidative stress,and the incidence of severe complications associated with hepatectomy.Results:Compared with patients receiving standard fluid management,patients in the intervention group had a shorter time to anal exhaust after surgery(1.5±0.6 days vs.2.0±0.8 days)and lower C-reactive protein activity(21.4[95%confidence interval(CI):11.9-36.7]mg/L vs.44.8[95%CI:26.9-63.1]mg/L)24 h after surgery.There were no significant differences in the time to defecation,serum concentrations of D-lactic acid,malondialdehyde,renal function,and frequency of severe postoperative complications as well as the LOS between the groups.Conclusion:Postoperative IVC respiratory variability-directed fluid therapy in AICU was facilitated in bowel movement but elicited a negligible beneficial effect on the short-term prognosis of patients undergoing LLR.Trial Registration:ChiCTR-INR-17013093.

Goal-directed Fluid Therapy May Improve Hemodynamic Stability of Parturient with Hypertensive Disorders of Pregnancy Under Combined Spinal Epidural Anesthesia for Cesarean Delivery and the Well-being of Newborns

Background： Hypotension induced by combined spinal epidural anesthesia in parturient with hypertensive disorders of pregnancy （HDP） can easily compromise blood supply to vital organs including uteroplacental perfusion and result in fetal distress. The aim of this study was to investigate whether the goal-directed fluid therapy （GDFT） with LiDCOrapid system can improve well-being of both HDP parturient and their babies. Methods： Fifty-two stable HDP parturient scheduled for elective cesarean delivery were recruited. After loading with 10 ml/kg lactated Ringer＇s solution （LR）, parturient were randomized to the GDFT and control group. In the GDFT group, individualized fluid therapy was guided by increase in stroke volume （ASV） provided via LiDCO rapid system. The control group received the routine fluid therapy. The primary endpoints included maternal hypotension and the doses of vasopressors administered prior to fetal delivery. The secondary endpoints included umbilical blood gas abnormalities and neonatal adverse events. Results： The severity of HDP was similar between two groups. The total LR infusion （P 〈 0.01） and urine output （P 〈 0.05） were higher in the GDFT group than in the control group. Following twice fluid challenge tests, the systolic blood pressure, mean blood pressure, cardiac output and SV in the GDFT group were significantly higher, and the heart rate was lower than in the control group. The incidence of maternal hypotension and doses of phenylephrine used prior to fetal delivery were significantly higher in the control group than in the GDFT group （P 〈 0.01）. There were no differences in the Apgar scores between two groups. In the control group, the mean values of pH in umbilical artery/vein were remarkably decreased （P 〈 0.05）, and the incidences of neonatal hypercapnia and hypoxemia were statistically increased （P 〈 0.05） than in the GDFT group. Conclusions： Dynamic responsiveness guided fluid therapy with the LiDCOrapid system may provide potential benefits to stable HDP parturient and their babies.

Bioreactance-guided fluid therapy for excision of a giant brain tumor in an infant under general anesthesia:A case report and literature review

Pediatric patients are more likely to suffer from brain tumors.Surgical resection is often the optimal treatment.Perioperative management of pediatric brain tumor resection brings great challenges to anesthesiologists,especially for fluid therapy.In this case,the infant-patient was only 69-day-old,weighed 6 kg,but she was facing a gaint brain tumor(7.9 cm×8.1 cm×6.7 cm)excision.The infant was at great risks such as hemorrhagic shock,cerebral edema,pulmonary edema,congestive heart failure,coagulation dysfunction,etc.However,we tried to use the parameters obtained by bioreactance-based NICOM^(■)device(Cheetah Medical)to guide the infant’s intraoperative fluid therapy,and successfully avoided these complications and achieved a good prognosis.

Perioperative fluid management in major hepatic resection: an integrative review

BACKGROUND: Fluid intervention and vasoactive pharmacological support during hepatic resection depend on the preference of the attending clinician, institutional resources, and practice culture. Evidence-based recommendations to guide perioperative fluid management are currently limited. Therefore, we provide a contemporary clinical integrative overview of the fundamental principles underpinning fluid intervention and hemodynamic optimization for adult patients undergoing major hepatic resection. DATA SOURCES: A literature review was performed of MEDLINE, EMBASE and the Cochrane Central Registry of Controlled Trials using the terms 'surgery', 'anesthesia', 'starch', 'hydroxyethyl starch derivatives', 'albumin', 'gelatin', 'liver resection', 'hepatic resection', 'fluids', 'fluid therapy', 'crystalloid', 'colloid', 'saline', 'plasma-Lyte', 'plasmalyte', 'hartmann's', 'acetate', and 'lactate'. Search results for MEDLINE and EMBASE were additionally limited to studies on human populations that included adult age groups and publications in English. RESULTS: A total of 113 articles were included after appropriate inclusion criteria screening. Perioperative fluid management as it relates to various anesthetic and surgical techniques is discussed.CONCLUSIONS: Clinicians should have a fundamental understanding of the surgical phases of the resection, hemodynamic goals, and anesthesia challenges in attempts to individualize therapy to the patient's underlying pathophysiological condition. Therefore, an ideal approach for perioperative fluid therapy is always individualized. Planning and designing large-scale clinical trials are imperative to define the optimal type and amount of fluid for patients undergoing major hepatic resection. Further clinical trials evaluating different intraoperative goal-directed strategies are also eagerly awaited.

The Effect of Non-Invasive Goal Directed Fluid Administration on Graft Function in Deceased Donor Renal Transplantation: A Pilot Study

Background: Non-invasive goal directed fluid therapy during deceased donor renal transplant (CRT) may reduce the incidence of delayed graft function. Plethysmograph Variability Index (PVI) has been shown to predict fluid responsiveness during surgery. This pilot study evaluated the feasibility of goal directed fluid administration protocol based upon PVI studying the incidence of delayed graft function (DGF) in renal transplant recipients. Methods: Twenty patients underwent primary CRT. The Control group received intravenous fluid (IVF) at a calculated constant rate. The Treatment group received a baseline IVF infusion throughout the surgery. PVI values greater than 13% were treated with 250 ml boluses of IVF. Primary end point was DGF;total IVF administration and urinary biomarker NGAL levels were secondary endpoints. Results: Treatment group at every time point received significantly less IVF. There was no significant difference in incidence of DGF between the groups. 2 patients in the Control group and 6 in the Treatment group developed DGF. NGAL was not associated with the group assignment or total IVF given (p < 0.2). Conclusions: The effectiveness of goal directed fluid therapy with non-invasive dynamic parameters has not been validated in renal transplant surgery and larger prospective studies are needed to determine its utility in renal transplantation.

Management of Rhabdomyolysis and Acute Renal Failure Following Strenuous Exercise in Young Adult: A Case Report

Introduction: Rhabdomyolysis is severe and life threating condition in which skeletal muscles are damaged by dissolution of striped muscles. Acute kidney injury (AKI) has been widely reported (13% - 50%) as a complication of Rhabdomyolysis in which the main pathophysiological mechanisms are intra-renal vasoconstriction, intraluminal cast formation (Tamm-Horsefall) and direct myoglobin toxicity. In this report we are going to describe the management of Acute Kidney Injury due to Rhabdomyolysis that is not responding to vigorous rehydration. Objective: Reporting about acute renal failure induced by Rhabdomyolysis due to Excessive Exercise and dehydration in young patient. Case Report: A 20 years male came to the outpatient clinic complaining of sever lower limb pain, back pain and vomiting. He was anuric and hypertensive (BP = 150/90 mmHg) with serum creatinine and urea levels of 15.72 mg/dl and 235 mg/dl, respectively. The diagnosis was based on the laboratory finding of creatine kinase = 3127 IU/l. The patient, then, has been referred to the emergency department. The Management plan was based on two arms: Emergency Management with Urgent Hemodialysis for AKI and high fluid replacement therapy. Patient started to recover after three hemodialysis sessions but the peak of recovery was noted after starting manual fluid replacement therapy with a target urine output of greater than 2 ml/kg, a urine pH of greater than 6. Manual fluid replacement therapy consisted of loop diuretics, intravenous fluids and intravenous sodium bicarbonate 1.26%. Full recovery was noted after one month of hospital admission with inpatient care and regular follow-up. A follow-up after one month has been set to assess the patient progression and monitor his kidney functions. Relevance and Impact: Home messages and lessons are;Firstly, young adults are vulnerable to Rhabdomyolysis, second, the diagnosis of Rhabdomyolysis can be made on the clinical bases but a confirmatory laboratory test of Creatine Kinase is mandatory, and lastly’ acute kidney injury needs to be treated urgently. Also, reducing the risk of infection is one of the management objectives to achieve recovery.

Perioperative"remote"acute lung injury:recent update

Perioperative acute lung injury（ALI） is a syndrome characterised by hypoxia and chest radiograph changes.It is a serious post-operative complication,associated with considerable mortality and morbidity.In addition to mechanical ventilation,remote organ insult could also trigger systemic responses which induce ALI.Currently,there are limited treatment options available beyond conservative respiratory support.However,increasing understanding of the pathophysiology of ALI and the biochemical pathways involved will aid the development of novel treatments and help to improve patient outcome as well as to reduce cost to the health service.In this review we will discuss the epidemiology of peri-operative ALI;the cellular and molecular mechanisms involved on the pathological process;the clinical considerations in preventing and managing perioperative ALI and the potential future treatment options.

Intraoperative Goal-Directed Therapies in Femoral and Pelvic Osteotomies in Children and In-Hospital Postoperative Outcomes

Background: Femoral and pelvic osteotomies are potential hemorrhagic interventions where transfusion requirements can be necessary. Objective: We undertook a secondary analysis of patients who underwent femoral and pelvic osteotomy in the initial cohort. The objective of this secondary analysis was to describe intraoperative and postoperative outcomes and to describe intraoperative management in these patients in terms of blood product management and fluid and hemodynamic therapy with the aim of implementing optimization management protocols for postoperative outcome improvement. Methods: A secondary analysis of patients who underwent femoral and pelvic osteotomy surgery was included in the initial retrospective study. Results: There were eighteen patients with a mean age of 104 ± 47.1 months. Four (22.2%) patients had intraoperative and/or postoperative complications. One patient (5.6%) had an intraoperative hemorrhagic shock, two patients (11.1%) had postoperative neurologic failure, and one patient (5.6%) had postoperative wound sepsis. The transfusion rate was 50% in nine patients. Conclusion: Femoral and pelvic osteotomies are interventions where blood, transfusion and fluid requirements can be increased;thus, this implies the necessity of a global patient blood management protocol with point-of-care tests and fluid- and hemodynamic-guided protocols with validated tools in children for intraoperative and postoperative outcome optimization.

Veno-Venous Extra-Corporeal Membrane Oxygenation (ECMO) in a Child with Hemoptysis and Fontan Circulation

Background: Extracorporeal membrane oxygenation is a rescue life support technique used in life threatening conditions of refractory respiratory and/or cardiac distress. Indication for extracorporeal life support in children depends on age and varies from pulmonary to cardiac pathologies. In some cases, it may be used as a bridge to a therapeutic procedure. We described here the management of respiratory failure due to hemoptysis in a child with a Fontan circulation and veno-venous extracorporeal membrane oxygenation which served as a bridge to angio-embolization. Hemoptysis can be a life threatening condition which can lead to hypovolemic shock and impaired alveolar gas exchange. The latter can result in respiratory failure and consequent asphyxia. When hemoptysis occurs in a patient with a univentricular heart and a Fontan circulation, management of this clinical situation can be challenging due to the particular physiology of the latter. Total cavopulmonary connection is a palliative surgical repair which constitutes Fontan circulation as a definitive treatment in patients with a univentricular heart. Methods: Case report description of a 16 year-old boy with a univentricular heart and a Fontan circulation who presented hemoptysis managed with a veno-venous extracorporeal membrane oxygenation (ECMO) as a bridge to angio-embolization. Results: Hemoptysis due to diffuse intra-alveolar hemorrhage from collateral circulation was successfully treated in this young patient with pulmonary vascular embolization. This allowed to wean the patient from extra-corporeal membrane oxygenation. Conclusion: Veno-venous ECMO can be life-saving as a bridge to angio-embolization for severe hemoptysis in patients with Fontan circulation. The reported case allows to underline that our multidisciplinary approach in this complex pediatric patient surely participated to improve outcome.

Assessment effect of central venous pressure in fluid resuscitation in the patients with shock： a multi-center retrospective research

Background Central venous pressure （CVP） and intrathoracic blood volume index （ITBVI） were used to assess the fluid status. It has previously been shown that CVP is not as accurate as ITBVI for all the shock patients. We therefore hypothesized that the change of CVP has the ability to predict fluid responsiveness in some clinical cases of shock. Methods From September 1st 2009 to September 1st 2011, sixty-three patients with shock from different Intensive Care Unit （ICU） were collected into this retrospective study. All the patients received fluid challenge strategy （infusing 300 ml hydroxyethyl starch in 20 minutes）, were monitored with CVP and pulse-indicated continuous cardiac output （PICCO）. The correlation between changes in cardiac index （ACI）, CVP （ACVP） and ITBVI （AITBVI） were analyzed. Fluid responsiveness was defined as an increase in CI 〉10%. Receiver operating characteristic （ROC） curves were generated for ACVP and AITBVI. Results For all the patients, there was no correlation between ACI and ACVP （P=0.073）, but in the subgroup analysis, the correlation between ACI and ACVP was significant in those younger than 60 years old （P=0.018） and those with hypovolemic shock （P=0.001）. The difference of areas under the ROC curves of ACVP and AITBVI were not statistically significant in the group younger than 60 years old or hypovolemic shock group （P 〉0.05, respectively）. However, no similar results can be found in the group older than 60 years old and the other two shock type groups from ROC curves of ACVP and AITBVI. Conclusions ACVP is not suitable for evaluating the volume status of the shock patients with fluid resuscitation regardless of their condition. However, in some ways, ACVP have the ability to predict fluid responsiveness in the younger shock patients or in the hypovolemic shock patients.

Fluids administration and coagulation characteristics in patients with different model for end-stage liver disease scores undergoing orthotopic liver transplantation

Background There have been many studies investigating the impact of the model for end-stage liver disease （MELD） score on predicting post-transplant outcome. But it is unclear whether MELD is correlated to intraoperative fluid therapy and coagulation status. We investigated the relationship between the severity of liver diseases as measured by MELD score and intraoperative fluid requirements and the changes of coagulation characteristics. Methods Ninety patients were included in this retrospective study. The patients were stratified into three groups according to the MELD scores： 〈15 （low）, 15-25 （medium） and 〉25 （high）. Intraoperatively, volume was restored with allogeneic and/or salvaged red blood cells （RBC）, fresh-frozen plasma （FFP）, platelet and other types of fluids according to hemodynamic data, hematocrit, and clotting data. Intraoperative coagulation data, blood requirements and other fluids administered were compared among the 3 groups. Results Before surgery, in addition to the three variables used to calculate MELD scores in other baseline laboratory values, including ratio of activated partial thromboplastin time （R-APTT）, D-Dimer, hematocrit, platelet and blood urea nitrogen （BUN） were significantly different among the 3 groups. The blood loss increased with increasing MELD. The volume of RBC （allogeneinc, salvaged and total）, FFP, platelet and the total volume of transfusion were also significantly different among the three groups （P〈0.01）. The requirements for prothrombin complex and fibrinogen showed a similar pattern. During operation, the changing trends of each coagulation variable were different. Compared with baseline, during each intraoperative stage, INR and R-APPT increased in the low MELD group. While in the medium MELD and high MELD groups, INR did not changed significantly during the operation, and R-APPT significantly increased only after reperfusion. Conclusions This study provided some useful information for perioperative management of patients undergoing liver transplantation. Careful preoperative planning and resource preparation are crucial for patients with high MELD scores. Close communication between surgeon, anesthesiologist and the transfusion staff of blood bank before and during surgery should be stressed.

Resuscitation fluids as drugs:targeting the endothelial glycocalyx

Fluid resuscitation is an essential intervention in critically ill patients,and its ultimate goal is to restore tissue perfusion.Critical illnesses are often accompanied by glycocalyx degradation caused by inflammatory reactions,hypoperfusion,shock,and so forth,leading to disturbed microcirculatory perfusion and organ dysfunction.Therefore,maintaining or even restoring the glycocalyx integrity may be of high priority in the therapeutic strategy.Like drugs,however,different resuscitation fluids may have beneficial or harmful effects on the integrity of the glycocalyx.The purpose of this article is to review the effects of different resuscitation fluids on the glycocalyx.Many animal studies have shown that normal saline might be associated with glycocalyx degradation,but clinical studies have not confirmed this finding.Hydroxyethyl starch(HES),rather than other synthetic colloids,may restore the glycocalyx.However,the use of HES also leads to serious adverse events such as acute kidney injury and bleeding tendencies.Some studies have suggested that albumin may restore the glycocalyx,whereas others have suggested that balanced crystalloids might aggravate glycocalyx degradation.Notably,most studies did not correct the effects of the infusion rate or fluid volume;therefore,the results of using balanced crystalloids remain unclear.Moreover,mainly animal studies have suggested that plasma may protect and restore glycocalyx integrity,and this still requires confirmation by high-quality clinical studies.