Liberal Fluid Research Articles

Priorities for paediatric critical care research: a modified Delphi study by the Australian and New Zealand Intensive Care Society Paediatric Study Group

Objective: Most interventions in paediatric critical care lack high grade evidence. We aimed to identify the key research priorities and key clinical outcome measures pertinent to research in paediatric intensive care patients. Design: Modified three-stage Delphi study combining staged online surveys, followed by a face-to-face discussion and final voting. Setting: Paediatric intensive care units in Australia and New Zealand. Participants: Medical and nursing staff working in intensive care. Main outcome measurements: Self-reported priorities for research. Results: 193 respondents provided a total of 267 research questions and 234 outcomes. In Stage 3, the top 56 research questions and 50 outcomes were discussed face to face, which allowed the identification of the top 20 research questions with the Hanlon prioritisation score and the top 20 outcomes. Topics centred on the use of intravenous fluids (restrictive v liberal fluids, use of fluid resuscitation bolus, early inotrope use, type of intravenous fluid, and assessment of fluid responsiveness), and patient- and family-centred outcomes (health-related quality of life, liberation) emerged as priorities. While mortality, length of stay, and organ support/organ dysfunction were considered important and the most feasible outcomes, long term quality of life and neurodevelopmental measures were rated highly in terms of their importance. Conclusions: Using a modified Delphi method, this study provides guidance towards prioritisation of research topics in paediatric critical care in Australia and New Zealand, and identifies study outcomes of key relevance to clinicians and experts in the field.

Preoperative fluid fasting : Establishment of a liberal fluid regimen using fasting cards

Preoperative fasting times for clear liquids surpass by far the recommendations of the specialist societies. The aim of this study was to introduce aliberal regimen for preoperative fasting of clear liquids using fasting cards as atraining tool and to evaluate the implementation. We developed aliberalized regimen of preoperative clear fluid fasting times, which allows patients to drink water, apple juice, tea and coffee until being called to the operating theatre. Each patient receives abed-side fasting card with written information specifying fasting times for solid food and liquids. Patients who are allowed to drink water, apple juice, tea and coffee until the call to the operating theatre receive ablue fasting card. Patients with coexisting diseases or conditions that can affect gastric emptying or who need longer fasting times because of the surgical procedure get ayellow fasting card on which fasting times for fluids and solids can be documented individually. Patients who need to be nil per os (for example patients with ileus or bowel obstruction, emergency care) receive ared fasting card. On the back of the card the information is written in English, Turkish, Russian and Arabic. After aperiod of 8 months all surgical ward managers were asked to complete aquestionnaire to assess the implementation of the new fasting regimen. The response rate of the questionnaire was 100%. Without exception all interviewees would recommend the use of our liberalized fasting regimen. Almost all would also support the implementation of fasting cards. Out of 11 wards 9 found that patients were more relaxed and asked for intravenous fluids less often while waiting for surgery. The multilingual nature of the cards makes it easier to deal with patients who do not speak German. All ward managers consistently approved the new regimen in the event they themselves would need an operation. In order to make the fasting cards also usable in the future for rescue centers and functional units, such as endoscopy, echo or cardiac catheters, the reasons for fasting on the blue and yellow cards have been extended to operation or examination and on the red card to illness, operation or upcoming examination. Patients should be allowed to drink water and hypotonic clear fluids until shortly before an operation to avoid complications of overly long fasting times. Fasting cards help to implement this by providing easy to understand information for patients and healthcare workers. This concept should be clearly structured, transparent for everyone, written down and brought to the attention of the patient without alanguage barrier.

Crossing the rubicon: Exploring different peri – Operative fluid resuscitation strategies in traumatic extremity free tissue transfer- a retrospective case control study

Free tissue transfer has added to the plastic surgeon's armamentarium and has afforded patients more chances towards limb salvage in recent decades following severe trauma. Venous congestion is a common occurrence, can be the result of several reasons and has devastating results in patients' outcomes. Recent studies have highlighted the importance of restrictive fluid administration. We hypothesized that a restrictive fluid administration in the intra – operative period would be associated with a lower incidence of venous congestion in patients undergoing free flap reconstruction of traumatic defects of the extremities. All patients undergoing a perforator free flap soft tissue reconstruction of traumatic defects of the extremities, from 2005 to 2019 were retrospectively identified. Patient's demographics, comorbidities and technical aspects of the operation were extracted. The study population was divided in two groups based on the amount of fluids administered (restrictive: < 6 ml/kg/hr; liberal: ≥ 6 ml/kg/hr). Multivariate analyses were performed to identify the impact of fluid strategy on the development of clinically significant venous congestion. A total of 75 patients were identified. Out of these, 24 patients had clinically significant venous congestion. Fluid administration strategy [AOR (95% CI): 1.53 (1.22, 1.92)], use of the superficial venous system [0.03 (0.01, 0.26)], operative time [1.98 (1.97, 1.99)] and age>50 [5.60 (1.10, 28.52)]. A cut – off analysis identified 6 ml/kg/hr as the cut off point for fluid administration. Liberal fluid administration (≥6 ml/kg/hr) was independently associated with a higher incidence of venous congestion and return to the OR for flap debridement, both overall and after exclusion of anastomotic revisions. Venous congestion in free flap reconstruction following traumatic defects of the extremities remains high. Several factors are associated with congestion. Liberal fluid administration ≥6 ml/kg/hr is independently associated with this complications and should be avoided when possible. • Free Fasciocutaneous tissue transfer in lower extremity trauma is challenging. • Venous congestion can result in complete or partial flap loss. • Peri – operative fluid administration has been shown to increase the complication rate infree flaps. • Fluid administration intra – operative of more than 6 ml/kg/hr resulted in a higher incidence of venous congestion. • Judicious fluid administration may be warranted.

Early restrictive fluid resuscitation has no clinical advantage in experimental severe pediatric acute respiratory distress syndrome.

Intravenous fluids are widely used to treat circulatory deterioration in pediatric acute respiratory distress syndrome (PARDS). However, the accumulation of fluids in the first days of PARDS is associated with adverse outcome. As such, early fluid restriction may prove beneficial, yet the effects of such a fluid strategy on the cardiopulmonary physiology in PARDS are unclear. In this study, we compared the effect of a restrictive with a liberal fluid strategy on a hemodynamic response and the formation of pulmonary edema in an animal model of PARDS. Sixteen mechanically ventilated lambs (2-6 wk) received oleic acid infusion to induce PARDS and were randomized to a restrictive or liberal fluid strategy during a 6-h period of mechanical ventilation. Transpulmonary thermodilution determined extravascular lung water (EVLW) and cardiac output (CO). Postmortem lung wet-to-dry weight ratios were obtained by gravimetry. Restricting fluids significantly reduced fluid intake but increased the use of vasopressors among animals with PARDS. Arterial blood pressure was similar between groups, yet CO declined significantly in animals receiving restrictive fluids (P = 0.005). There was no difference in EVLW over time (P = 0.111) and lung wet-to-dry weight ratio [6.1, interquartile range (IQR) = 6.0-7.3 vs. 7.1, IQR = 6.6-9.4, restrictive vs. liberal, P = 0.725] between fluid strategies. Both fluid strategies stabilized blood pressure in this model, yet early fluid restriction abated CO. Early fluid restriction did not limit the formation of pulmonary edema; therefore, this study suggests that in the early phase of PARDS, a restrictive fluid strategy is not beneficial in terms of immediate cardiopulmonary effects.

Severe Intraabdominal Hypertension in Critically Ill COVID-19 Patients With Acute Kidney Injury

Severe Intraabdominal Hypertension in Critically Ill COVID-19 Patients With Acute Kidney Injury

Drinking during low-risk labor: monocentric randomized clinical trial on patients’ satisfaction, and maternal and neonatal outcomes

Introduction This study aimed to assess satisfaction of patients affected by various fluid regimes during uncomplicated labor; to identify factors possibly associated with the level of satisfaction; to compare obstetrical and neonatal outcomes between the intervention groups. Methods Between October and December 2014, 40 women were included in the study set at the Poitiers University Hospital, France. Women were randomly allocated to two study arms: 20 to strict and 20 to liberal fluid regime group. Women’s satisfaction was assessed using visual analog scale. Categorical obstetrical and neonatal outcomes were analyzed using Chi-squared test and Fischer’s exact test. The between-group difference was assessed with Mann–Whitney U-test. Results Overall satisfaction was higher among women from the liberal fluid regime than from the strict fluid regime group (median score: 88, interquartile range [IQR]: 21 vs. 72, IQR: 21; p = 0.03). The active phase of the second stage of labor was shorter in the liberal fluid regime than in the strict fluid regime group (median 9 min, IQR: 7 vs. 17 min, IQR: 12; p = 0.02). The length of stay in the delivery room was significantly shorter in liberal fluid regime than in strict fluid regime group (median 190 min, IQR: 128 vs. 340 min, IQR: 195, p = 0.04). There were no significant differences in other obstetrical and neonatal outcomes. Conclusion Liberal fluid regime during labor was associated with significantly higher satisfaction of women. The active phase of the second stage of labor and the length of stay in the delivery room were significantly shorter in the liberal fluid regime group.

Restrictive versus liberal perioperative fluid strategies to prevent post-dural puncture headache after cesarean delivery

BackgroundPost-dural puncture headache is a common complication after cesarean delivery. The role of fluid therapy in prevention of post-dural puncture headache is not clear. The aim of this work is to compare restrictive versus liberal perioperative fluid protocols in prevention of post-dural puncture headache. A randomized controlled trial was conducted including 100 full-term pregnant women undergoing cesarean delivery under spinal block. After receiving spinal block, all patients received 1.5 mcg/kg phenylephrine and crystalloid co-load at a rate of 10 mL/h. Patients were assigned into either restrictive group (did not receive fluid preload + received postoperative crystalloid therapy at a rate of 2 mL/kg/h till resuming oral fluids) or liberal group (received crystalloid preload 5 mL/kg before spinal block + received postoperative crystalloids at a rate of 6 mL/kg/h till resuming oral fluids. Both groups were compared according to the incidence of post-dural puncture headache, pain scores, systolic blood pressure, heart rate, incidence of post-spinal hypotension, nausea, and vomiting.ResultsThe incidence of post-dural puncture headache was lower in the restrictive group compared to the liberal group {10(20%) vs 22(44%), P = 0.018}. All other secondary outcomes were comparable between both groups.ConclusionRestrictive fluid therapy was associated with lower incidence of PDPH after cesarean delivery without impacting patient hemodynamic profile.

Effect of fluid strategy on stroke volume, cardiac output, and fluid responsiveness in adult patients undergoing major abdominal surgery: a sub-study of the Restrictive versus Liberal Fluid Therapy in Major Abdominal Surgery (RELIEF) trial

BackgroundWe designed a prospective sub-study of the larger Restrictive versus Liberal Fluid Therapy in Major Abdominal Surgery (RELIEF) trial to measure differences in stroke volume and other haemodynamic parameters at the end of the intraoperative fluid protocols. The haemodynamic effects of the two fluid regimens may increase our understanding of the observed perioperative outcomes. MethodsStroke volume and cardiac output were measured with both an oesophageal Doppler ultrasound monitor and arterial pressure waveform analysis. Stroke volume variation, pulse pressure variation, and plethysmographic variability index were also obtained. A passive leg raise manoeuvre was performed to identify fluid responsiveness. ResultsAnalysis of 105 patients showed that the primary outcome, Doppler monitor-derived stroke volume index, was higher in the liberal group: restrictive 38.5 (28.6–48.8) vs liberal 44.0 (34.9–61.9) ml m−2; P=0.043. Similarly, there was a higher cardiac index in the liberal group: 2.96 (2.32–4.05) vs 2.42 (1.94–3.26) L min−1 m−2; P=0.015. Arterial-pressure-based stroke volume and cardiac index did not differ, nor was there a significant difference in stroke volume variation, pulse pressure variation, or plethysmographic variability index. The passive leg raise manoeuvre showed fluid responsiveness in 40% of restrictive and 30% of liberal protocol patients (not significant). ConclusionsThe liberal fluid group from the RELIEF trial had significantly higher Doppler ultrasound monitor-derived stroke volume and cardiac output compared with the restrictive fluid group at the end of the intraoperative period. Measures of fluid responsiveness did not differ significantly between groups. Clinical trial registrationACTRN12615000125527.

Goal-directed Therapy and Postcystectomy Ileus: Comment.

We read the article by Arslan-Carlon et al.1 with great interest. The authors are to be congratulated for their research on the impact of fluid therapy on postoperative ileus. In this recent randomized, controlled trial including 283 patients, they found no difference in the incidence of postoperative ileus between patients treated with a goal-directed therapy compared with a standard procedure in a homogenous open radical cystectomy patient cohort from a high caseload center.The pathogenesis of postoperative ileus is clearly multifactorial (fluid overload, opioids, neurohormonal dysregulation, gastrointestinal stretch, inflammatory response).2,3 In the era of enhanced recovery protocols including multiple preoperative, intraoperative, and postoperative optimization steps, it is not surprising to find that intraoperative goal-directed therapy alone has no impact on the return of bowel function compared with a moderate liberal fluid standard fluid administration. Furthermore, it remains questionable whether postoperative fluid substitution should be uniformly managed in patients who received either an intraoperative goal-directed therapy or a restrictive or relatively liberal fluid administration. Indeed, in this study net fluid during the hospitalization was higher in the standard group (−1,986 ml vs. −1,296 ml) but resulted in similar maximum body weight changes (2.7 kg vs. 3.0 kg) and could be interpreted as the consequence of a more aggressive diuretic therapy in the standard group postoperatively. This is of importance because postoperative submucosal edema has been postulated as a risk factor for a delayed return of gastrointestinal function.3 Unfortunately, the authors did not give any information on the postoperative administration of diuretics.The problem of adequate terminology is another ongoing issue. We were surprised by the authors’ comment in the discussion that the term constipation was not adequately described in the article by Wuethrich et al., as both the term constipation as well as the term ileus were defined in the appendix. Constipation was defined as no passage of stool without signs of ileus by postoperative day 5 and could be considered similar to what was considered a primary postoperative ileus in the article by Arslan-Carlon et al. This definition was based on the nomenclature resulting from a well-performed case series analysis aiming to standardize complications after cystectomy from the Department of Urology at the Sloan-Kettering Cancer Center (New York, New York).5 Perhaps the authors could specify why they did not apply their own above-mentioned definition in the present study. We recognize that the publication by Shabsigh et al. is more than 10 yr old, but the goal of a good standardized reporting methodology should be its continued long-term applicability. The Clavien Dindo classification remains the best example hereof.4,6 In the context of prevention of postoperative ileus, it would also be interesting to know which opioid antagonist was administered subcutaneously perioperatively.Finally, no data are presented about the systemic administration of opioids, a known risk factor for delayed return of bowel function. We only learn that patients received an epidural analgesia with a mixture containing a very low dose of bupivacaine (0.05%) and a relatively high dosage of opioid (8 μg/ml hydromorphone).In conclusion, the saying “one size does not fit all” can also be applied to fluid therapy. This study is of importance because it shows no benefit of goal-directed therapy in terms of reducing gastrointestinal-related complication rates. A more selective and differentiated approach in fluid management is needed. In some cases, restrictive fluid therapy may be beneficial, and in other cases, a modestly liberal fluid administration resulting in a postoperative weight gain of approximately 2 to 3 kg would make no difference in outcome. Fluid management is only part of a complex battery of interventions affecting outcome after open radical cystectomy.The authors declare no competing interests.

Comparison of liberal and goal-directed fluid therapy after small intestinal surgery for strangulating lesions in horses.

There are few guidelines for the appropriate mode of fluid administration during and after colic surgery, and is challenging to reach the right balance while avoiding overhydration. This study aimed to compare goal-directed fluid therapy (GDFT) and 'liberal' fluid regimens (LFRs) in horses undergoing small intestinal surgery. Eighteen horses subjected to small intestinal surgery were matched according to the surgical lesion, type of anastomosis, length of resection, and duration of clinical signs. Horses in the LFR group were administered intravenous (IV) fluids for at least 24 h. In the GDFT group, IV fluids were administered only when considered necessary based on clinical parameters. Postoperative reflux (POR), packed cell volume, total protein, heart rate, venous lactate level, complications, and long-term survival rates were compared. Three horses in the LFR and one in the GDFT group developed POR. Horses in the GDFT group had a shorter time interval to first oral water intake and shorter hospitalisation time. Postoperative complication rates and survival were not different between groups. Further studies are necessary to set guidelines for the evaluation of hydration status and to plan postoperative fluid administration; however, GDFT may be a valid alternative to liberal fluid therapy after colic surgery.

What's New in Shock, February 2021?

What's New in Shock, February 2021?

Higher Fluid Balance is Associated With Worse Outcome in Critically Ill Traumatic Brain Injury Patients

Background: Fluid therapy is a ubiquitous part of management of critically ill patients with traumatic brain injury (TBI) and may impact on outcome. Our aim was to quantify variability in current fluid therapy in patients with TBI admitted at European and Australian Intensive Care Units (ICUs) and to study the association between fluid therapy and outcome after TBI. Methods: We analyzed data from patients admitted to the ICU with TBI and aged 16 and older included in the observational European CENTER-TBI and Australian OzENTER-TBI studies. The association of net daily fluid balance and -input with outcome (ICU mortality and functional outcome at 6 months) was analyzed at patient level with mixed effects logistic and ordinal regression with a random intercept for centre and adjustment for patient characteristics, and at centre level with centre as instrumental variable. Findings: In total, 2125 patients were included (1005 patients with isolated TBI). Mean daily fluid input ranged from 1·5 to 4·2L per centre. More positive daily mean fluid balance and fluid input were associated with worse outcome in patient-level analyses (fluid balance: ORs per 0·1L increase 1·10 [95%CI:1·07–1·13] and 1·03 [95%CI:1·02–1·05] for ICU mortality and functional outcome respectively; fluid input: ORs 1·05 [95%CI:1·03–1·06] and 1·03 [95%CI:1·02–1·04]). Centre-level analysis showed similar associations for fluid balance (ORs 1·15 [95%CI:1·02-1·29]; and 1·07 [95%CI:1·01-1·12], but not for fluid input (ORs: 0·95 [95%CI: 0·90-1·00]; and 1·01 [95%CI:0·99–1·03]). Interpretation: In critically ill patients with TBI, there is significant variability in fluid management with more positive fluid balances being associated with worse outcomes. Further research is needed to establish whether mitigation of positive fluid balance by less liberal fluid administration contributes to improved outcome. Funding: This research was funded by the European Commission 7th Framework program (602150) and the Australian Health and Medical Research Council (NHMRC 1074181). Declaration of Interests: DJC is an Australian NHMRC Practitioner Fellow and reports grants from the NHMRC and consulting fees to Monash University from PresSura Neuro. AIM declares consulting fees from PresSura Neuro, Integra Life Sciences, and NeuroTrauma Sciences. DKM reports grants from the UK National Institute for Health Research, during the conduct of the study; grants, personal fees, and non-financial support from GlaxoSmithKline; personal fees from Neurotrauma Sciences, Lantmaanen AB, Pressura, and Pfizer, outside of the submitted work. ES reports personal fees from Springer, during the conduct of the study. All other authors declare no competing interests. Ethics Approval Statement: In each recruiting site ethical approval was given.

Understanding Restrictive Versus Liberal Fluid Therapy for Major Abdominal Surgery Trial Results: Did Liberal Fluids Associate With Increased Endothelial Injury Markers?

The restrictive versus liberal fluid therapy for major abdominal surgery trial was an international, randomized, assessor-blinded trial comparing restrictive with liberal IV fluid regimens that represented traditional care in patients undergoing major abdominal surgery. Cohort of restrictive versus liberal fluid therapy for major abdominal surgery bloods was collected at a single major site (161 patients) prior to, day 1 and day 3 after surgery. Bloods were blindly and randomly batch analyzed for plasma markers of endothelial/glycocalyx injury-angiopoietin-1, angiopoietin-2, soluble tyrosine-protein kinase-2 receptor, soluble intracellular adhesion molecule-1, syndecan, and tumor necrosis factor-α. Data were examined as restrictive versus liberal enrollment groups and high versus low (± 5,000 mL) fluid groups. Differences were examined by linear mixed modeling. There were no significant differences in any biomarkers between the restrictive (n = 75) and liberal (n = 86) groups. When examined as low (n = 81) and high (n = 79) fluid groups, plasma angiopoietin-2 (p = 0.009) and soluble intracellular adhesion molecule-1 (p = 0.01) were elevated in the high fluid group. There were no differences in other biomarkers. Although these results are consistent with previous findings of vascular injury following liberal fluid therapy, they suggest alternative mechanisms underlie the clinical outcomes from restrictive versus liberal fluid therapy for major abdominal surgery study. NCT01424150.

Pulmonary Complications in Esophagectomy Based on Intraoperative Fluid Rate: A Single-Center Study

Esophagectomy is associated with significant morbidity and mortality. The authors assessed the relationship between intraoperative fluid (IOF) administration and postoperative pulmonary outcomes in patients undergoing a transthoracic, transhiatal, or tri-incisional esophagectomy. Retrospective cohort study (level 3 evidence). Tertiary care referral center. Patients who underwent esophagectomy from 2007 to 2017. The IOF rate (mL/kg/h) was the predictor variable analyzed both as a continuous and binary categorical variable based on median IOF rate for this cohort (11.90 mL/kg/h). Primary outcomes included rates of acute respiratory distress syndrome (ARDS) within ten days after esophagectomy. Secondary outcomes included rates of reintubation, pneumonia, cardiac or renal morbidity, intensive care unit admission, length of stay, procedure-related complications, and mortality. Multivariate regression analysis determined associations between IOF rate and postoperative outcomes. Analysis was adjusted for age, sex, body mass index, procedure type, year, and thoracic epidural use. A total of 1,040 patients comprised this cohort. Tri-incisional esophagectomy was associated with a higher hospital mortality rate (7.8%) compared with transthoracic esophagectomy (2.6%, p = 0.03) or transhiatal esophagectomy (0.7%, p = 0.01). Regression analysis revealed a higher IOF rate was associated with greater ARDS within ten days (adjusted odds ratio [OR] = 1.03, p = 0.01). For secondary outcomes, a higher IOF rate was associated with greater hospital mortality (adjusted OR = 1.05, p = 0.002), although no significant association with 30-day hospital mortality was identified. Increased IOF administration during esophagectomy may be associated with worse postoperative pulmonary complications, specifically ARDS. Future well-powered studies are warranted, including randomized, controlled trials comparing liberal versus restrictive fluid administration in this surgical population.

Hipertermik İntraperitoneal Kemoterapi Yapılan Hastalarda İntraoperatif Restriktif Sıvı Tedavisinin Postoperatif Sonuçlar Üzerine Etkisi

INTRODUCTION: Hyperthermic intraperitoneal chemotherapy (HIPEC) and cytoreductive surgery (CRC) are effective multimodal treatment options in patients with peritoneal carcinomatosis. Procedures are long-lasting operations with excessive blood and fluid loss. Intraoperative fluid management is very important because of major hemodynamic, respiratory and metabolic changes. This study aims to investigate the effect of intraoperative restrictive fluid therapy on postoperative outcome in patients undergoing HIPEC and SRS. METHODS: Patients who underwent HIPEC and SRS in our clinic between 2014-2018 were included in the study. The demographic, intraoperative and postoperative data of all patients were retrospectively analyzed. The patients who underwent restrictive fluid replacement were named Group R, and the group with liberal fluid replacement was named Group L. RESULTS: It was observed that the mean age was 54.6 ± 11.4 years, the female gender was 60.5% and the malignancy originating from the gastrointestinal system was 76.3%. There was no effect of liberal and restrictive fluid treatments on postoperative minor and major complications, length of stay in hospital and intensive care, and mortality. DISCUSSION AND CONCLUSION: We concluded that intraoperative restrictive fluid therapy did not affect postoperative complications and mortality in HIPEC and SRS surgeries.

Role of Fluid Management on Renal Failure in Hospitalized COVID-19 Patients

Introduction: The reported incidence of AKI with COVID-19 varies from 0.5% to 22%. Several mechanisms were postulated as a cause of AKI in patients infected with COVID-19. The appropriate management of AKI in patients with COVID-19 remains unclear at this time. One point of absolute importance, is the consideration of volume status. Given the paucity of knowledge with regards to the role of different strategies for fluid management during an episode of AKI in patients with COVID-19, this retrospective study aims to compare renal outcome and overall prognosis in patients who received conservative versus liberal fluid management. Methods: This is a single-center retrospective observational cohort study at a community hospital in Westchester County, NY. All adult patients who tested positive for the COVID-19 infection by PCR testing of a nasopharyngeal swab and were hospitalized from March 22, 2020 to May 25, 2020 are eligible. Among those identified with AKI, patients were divided into two groups: conservative fluid administration versus liberal fluid administration. Results: Of the 136 patients, 84 (61.76%) were admitted to the ICU, with 60% of patients under the conservative fluid strategy and 40% receiving liberal fluid management. On the other hand, 52 (38.23%) patients were admitted on the medical floors, with more patients (67.31%) receiving liberal fluid management. Discussion: In our cohort of 136 patients with COVID-19 respiratory illness and AKI, there was a significant difference in renal outcome, in terms of improvement of renal function in patients receiving liberal fluid management (55.07%) versus conservative fluid management (16.41%, p ≤ 0.001), with more patients in the liberal group having lower peak creatinine before levels improved. This, as well, was associated with improvement in oxygenation, characterized by improvement in respiratory status, facilitating weaning of oxygen supplementation (p < 0.001). On the other hand, there was no significant difference between the conservative and liberal groups in terms of undergoing renal replacement therapy. Twenty-one of the 136 patients with AKI required RRT and 19 (90%) of them were admitted to the ICU and mechanically ventilated. On the other hand, there was no statistical difference in mortality rate of patients who underwent renal replacement therapy, regardless of whether they were in the conservative or liberal strategy group. Conclusion: Our data report that liberal fluid management in COVID-19 patients with AKI, had better outcomes, in terms of renal function, oxygenation and mortality rate, as compared to patients in the conservative fluid management group. Once patients are started on renal replacement therapy, however, renal and lung outcomes and mortality rate become insignificant between the two groups.

Goal Directed Fluid Therapy based on Stroke Volume Variation and Oxygen Delivery Index using Electrical Cardiometry in patients undergoing Scoliosis Surgery

ABSTRACT Background: The primary outcome was to evaluate whether goal-directed fluid therapy (GDFT) protocol, established on stroke volume variation (SVV) and oxygen delivery index (DO2I) using electrical cardiometry (EC) monitor, would be effective in reducing perioperative packed red blood cells (RBCs) transfusion, whereas the secondary outcome was to compare the effects of GDFT with liberal fluid therapy (LFT) as regards total amount of fluids transfused, perioperative complications, and postoperative length of ICU and total hospital stay. Settings and Design: This study was a prospective randomized controlled clinical trial. Methods: The study was carried out on 48 patients scheduled for scoliosis surgery. Twenty-four patients, whose intraoperative fluid administration was managed with the GDFT protocol, were compared with 24 patients who received a liberal intraoperative fluid therapy. The proposal and raw data were registered on PACTR as PACTR202007901764021. Results: Patients in group II received less units of packed RBCs (P < 0.001) and a lower volume of intraoperative crystalloids (P < 0.001). They had significantly lower serum lactate levels 2 h after induction (P = 0.033), at the end of surgery (P = 0.001) and 2 h postoperatively (P < 0.001) with shorter ICU stay (P < 0.001), total hospital length of stay (P < 0.001), and faster return of bowel function (P = 0.005). Conclusion:: Application of a GDFT protocol, established o SVV and DO2I using EC monitor in patients undergoing scoliosis surgery, can lead to reduced packed RBCs transfusions, reduced total crystalloid volume infusions, less postoperative pulmonary complications, shorter ICU, and total hospital stay with faster return of gastrointestinal function. Abbreviations: GDFT: goal-directed fluid therapy; SVV: stroke volume variation; DO2I: oxygen delivery index; EC: electrical cardiometry; LFT: liberal fluid therapy; CI: cardiac index; RBCs: red blood cells; CO: cardiac output; IVC: inferior vena cava; CVP: central venous pressure; MAP: mean arterial pressure; CaO2: arterial oxygen content; UOP: urine output; ASA: American Society of Anesthesiologist; BMI: body mass index; ROC: receiver operating characteristic; AUC: area under the curve; FFP: fresh frozen plasma

Prevent deterioration and long-term ventilation: intensive care following thoracic surgery.

Patients with indication for lung surgery besides the pulmonary pathology often suffer from independent comorbidities affecting several other organ systems. Preventing patients from harmful complications due to decompensation of underlying organ insufficiencies perioperatively is pivotal. This review draws attention to the peri- and postoperative responsibility of the anaesthetist and intensivist to prevent patients undergoing lung surgery deterioration. During the last decades we had to accept that 'traditional' intensive care medicine implying deep sedation, controlled ventilation, liberal fluid therapy, and broad-spectrum antimicrobial therapy because of several side-effects resulted in prolongation of hospital length of stay and a decline in quality of life. Modern therapy therefore should focus on the convalescence of the patient and earliest possible reintegration in the 'life-before.' Avoidance of sedative and anticholinergic drugs, early extubation, prophylactic noninvasive ventilation and high-flow nasal oxygen therapy, early mobilization, well-adjusted fluid balance and reasonable use of antibiotics are the keystones of success. A perioperative interprofessional approach and a change in paradigms are the prerequisites to improve outcome and provide treatment for elder and comorbid patients with an indication for thoracic surgery.

Effect of the Type of Intraoperative Restrictive Fluid Management on the Outcome of Pancreaticoduodenectomy: A Systematic Review and Meta-Analysis

Background. The perioperative management of pancreaticoduodenectomy is complicated, and the significant morbidity and mortality may be influenced by the method of intraoperative fluid management. Whether intraoperative restrictive fluid therapy can affect the outcomes of pancreaticoduodenectomy or not is controversial. Methods. PubMed, EMBASE, Cochrane Library, and clinicaltrials.gov were searched for prospective and retrospective studies comparing restrictive and liberal intraoperative fluids in patients undergoing pancreaticoduodenectomy. Following study identification, a systematic review and meta-analysis were performed. Results. Fourteen studies, including six prospective trials and eight retrospective studies, involving 2,596 patients, were included. Intraoperative restrictive fluid regimens had no effect on the mortality compared to liberal fluid regimens in the overall cohort (odds ratio [OR]: 1.39; 95% confidence interval [CI]: 0.82–2.35, p = 0.773 ). Liberal fluid regimens could increase the risk of pulmonary adverse events (OR: 1.66; 95% CI: 1.10–2.50, p = 0.131 ) and prolong the length of hospital stay (SMD -0.10; 95% CI -0.19– -0.01, p = 0.375 ). There were no significant differences in the incidence of pancreatic fistulas. Conclusions. Restrictive fluid regimens have a slight effect on the outcomes of pancreaticoduodenectomy. The clinical relevance of this finding needs to be interpreted. The existing evidence may not be adequate; therefore, further studies are warranted.

Ultrasound assessment of gastric emptying time after intake of clear fluids in children scheduled for general anesthesia-A prospective observational study.

While many clinics have changed their local regimen toward a more liberal policy regarding clear fluid fasting for general anesthesia, there is a lack of studies evaluating gastric emptying time in a clinical setting. Based on this and before implementation of a more liberal preoperative clear fluid fasting policy for children, we studied gastric emptying time of clear fluids in children and hypothesized that the mean gastric emptying time would be 1hour. Between March and December 2019, children scheduled for general anesthesia at our University Children's Hospital were enrolled in this prospective observational study. After overnight fasting, gastric emptying was examined by sonographic measurements of the gastric antral area before and 5, 15, 30, 45, and 60minutes after intake of water or fruit juice. Twenty-six children were enrolled in this study, and 24 aged 11 (range 4-17) years were included for statistical analysis. The median ingested fluid volume was 4.7 (range 1.8-11.8)mLkg-1 . The gastric antral area of the children initially increased and subsequently decreased after intake of clear fluids and correlated significantly with fasting time (r=-0.55, P<.0001). After 1hour, the gastric antral area had returned to the baseline level in 20 children but not in four children with a fluid intake >5mLkg-1 . There was no difference in the gastric antral area between water and fruit juice. Using a linear regression model, the calculated mean gastric emptying time of clear fluids was 52minutes. This study showed that the gastric emptying time of children after intake up to 5mLkg-1 clear fluids was <1hour in a clinical setting. These results support the more liberal fasting regimen favoring a 1-hour fasting time and suggest 5mLkg-1 as an upper limit for clear fluids (eg, water, sugared water or tea or diluted fruit juice) from 2hours to 1hour before induction of anesthesia in children.