Bypass Surgery Research Articles

Duodenal-Jejunal Bypass Surgery in Diet-Induced Obese Diabetic Mice.

The prevalence of obesity and type 2 diabetes is a serious global health concern. Obesity is a major pathogenic factor in type 2 diabetes, cardiovascular disease, and some cancers. Bariatric surgery offers a long-term and effective treatment option for both obesity and diabetes. Sleeve gastrectomy (SG) and Roux-en-Y gastric bypass (RYGB) are widely recognized as the most popular bariatric surgeries. Additionally, several exploratory bariatric surgeries have demonstrated promising therapeutic effects. Duodenal-jejunal bypass (DJB), specifically tailored for diabetics with low body mass index, has shown beneficial metabolic outcomes. However, its weight-independent metabolic benefits are not fully understood due to limited animal models. In this article, we describe the optimized care protocols and surgical techniques for performing DJB surgery in diet-induced obese (DIO) diabetic mice. Using a mouse model contributes to a better understanding of the nature of changes induced by DJB surgery while facilitating related clinical practice.

Coronary artery calcium measurement on attenuation correction computed tomography using artificial intelligence: correlation with coronary flow capacity and prognosis.

This study aimed to test whether the coronary artery calcium (CAC) burden on attenuation correction computed tomography (CTac), measured using artificial intelligence (AI-CACac), correlates with coronary flow capacity (CFC) and prognosis. We retrospectively enrolled patients who underwent [13N]ammonia positron emission tomography (PET) between September 2021 and May 2023. CTac data were obtained from all the patients. Patients with (history of) acute coronary syndrome, previous coronary stent insertion or bypass surgery, or left ventricular ejection fraction < 40% were excluded. The total Agatston score measured using a dedicated AI-CAC quantification software on CTac was defined as AI-CACac. The correlations between AI-CACac and PET-measured myocardial blood flow (MBF) and CFC and significant ischaemia (summed difference score ≥ 7) were analysed. Their prognostic values for major cardiovascular events (MACE), including death, nonfatal myocardial infarction, hospitalisation due to angina pectoris or heart failure, and late (> 90 days) revascularisation, were also evaluated. In total, 289 patients were included in this study. Significant negative correlations were found between AI-CACac and stress MBF (ρ = -0.363, p < 0.001) and MFR (ρ = -0.305, p < 0.001). AI-CACac > 10 was associated with a significantly higher prevalence of impaired CFC (31% vs. 7%, p < 0.001) and significant ischaemia (20% vs. 7%), which remained significant after adjusting for other risk factors. MACE occurred in 49 (17%) patients (median follow-up, 284 days), and those who experienced MACE had significantly higher AI-CACac (median, 166 vs. 56; p = 0.039). However, multivariable analysis revealed an independent prognostic association among impaired CFC, diabetes, smoking, but not for AI-CACac. AI-measured CACac correlates well with PET-measured MBF and CFC, but its prognostic significance requires further validation.

Thirty-day outcome of patients who present with chest pain to the emergency department of a tertiary care hospital of Sri Lanka

Background: Patients present with chest pain causes significant burden to the workload in an emergency department (ED). Quick but thorough attention is needed for life threatening emergencies and to minimize unnecessary admissions. We assess the burden of chest pain and 30-day outcome of patients who present with chest pain to the ED. Methodology: Prospective observational study of all adult patients presented to ED over one month with the primary complain of chest pain were evaluated and followed for 30 days. Results: A total of 661 (20.3% of total admissions) patients (mean age 56.7±1 4.9 years, 51% males) were studied. Common causes for the chest pain included gastroesophageal reflux disease (GORD) (29%) and acute coronary syndrome (ACS) (25%). ACS patients included ST-elevation myocardial infarction (STEMI) (10%), Non-ST-elevation myocardial infarction (6.7%) and unstable angina (8.3%). Fifty patients (75% of the STEMI patients) were thrombolysed. Primary angioplasty facility was not available in the hospital during the study period. Five patients (3% of the ACS patients) had coronary revascularization during the follow-up period – 2 patients had angioplasty and 3 patients had coronary bypass surgery. In-hospital mortality was 2.7%. Thirty-day mortality was 3.2%. Thirty three percent of them continued to have recurrent chest pain despite thorough investigation and treatment. Conclusions: Chest pain carries a significant burden to the workload of a busy ED. The commonest causes for chest pain were ACS and GORD. A considerable number of patients continued to experienced chest pain despite investigations and treatment.

Gastric bypass elicits persistent gut adaptation and unique diabetes remission-related metabolic gene regulation.

We have previously shown that early intestinal adaptation precedes and relates to metabolic improvement in humans after Roux-en-Y gastric bypass surgery (RYGB). We hypothesized that intestinal adaptation would persist at the 1-year postoperative time point and that gene expression (GE) signatures would relate to type 2 diabetes remission, providing insight into potential mechanisms for intestinally mediated metabolic improvement after RYGB. We determined GE by RNA sequencing in jejunum (Roux limb [RL]) collected from 28 patients before and 12 months after RYGB. Global GE from paired baseline and 1-year jejunal samples did not separate according to clinical phenotype (type 2 diabetesremission, sustained weight loss). In general, GE was consistent with persistent RL remodeling, and microvilli were elongated by 39%. Remodeling was not attenuated in patients with lack of diabetes remission or with weight regain. Patients with diabetes remission demonstrated greater jejunal activation of lipogenesis-related pathways driven by RXR, LXR, and SREBP. RL adaptation is a key feature of RYGB in all patients, likely reflecting the dramatic alterations to gastrointestinal anatomy, but jejunal lipogenesis appears to be more strongly activated in those patients with diabetes remission. Further study is needed to understand whether these pathways may drive metabolic remission after RYGB.

Fungal bezoar of bladder in type 2 diabetic mellitus patient: A case report

A 54 year male, post operated case of bypass surgery presented to a Urologist with acute retention of urine. Patient was relieved by catheterization and bladder irrigation. WBC’s and RBC’s were increased in Urine. Cystoscopy revealed fungal balls in the bladder which on histopathological examination showed aseptate hyphae and spores. Patient was managed by systemic voriconazole and diluted povidone iodine bladder wash. Predisposing factors were diabetes mellitus and dyslipidemia. This case stresses the importance of considering isolated fungal urinary infections in predisposed individuals.

In vivo mapping of postprandial hepatic glucose metabolism using dynamic magnetic resonance spectroscopy combined with stable isotope flux analysis in Roux-en-Y gastric bypass adults and non-operated controls: A case-control study.

Roux-en-Y gastric bypass (RYGB) surgery alters postprandial glucose profiles, causing post-bariatric hypoglycaemia (PBH) in some individuals. Due to the liver's central role in glucose homeostasis, hepatic glucose handling might differ in RYGB-operated patients with PBH compared to non-operated healthy controls (HC). We enrolled RYGB-operated adults with PBH and HCs (n = 10 each). Participants ingested 60 g of [6,6'-2H2]-glucose (d-glucose) after an overnight fast. Deuterium metabolic imaging (DMI) with interleaved 13C magnetic resonance spectroscopy was performed before and until 150 min post-d-glucose intake, with frequent blood sampling to quantify glucose enrichment and gluco-regulatory hormones until 180 min. Glucose fluxes were assessed by mathematical modelling. Outcome trajectories were described using generalized additive models. In RYGB subjects, the hepatic d-glucose signal increased early, followed by a decrease, whereas HCs exhibited a gradual increase and consecutive stabilization. Postprandial hepatic glycogen accumulation and the suppression of endogenous glucose production were lower in RYGB patients than in HCs, despite higher insulin exposure, indicating lower hepatic insulin sensitivity. The systemic rate of ingested d-glucose was faster in RYGB, leading to a higher, earlier plasma glucose peak and increased insulin secretion. Postprandial glucose disposal increased in RYGB patients, without between-group differences in peripheral insulin sensitivity. Exploiting DMI with stable isotope flux analysis, we observed distinct postprandial hepatic glucose trajectories and parameters of glucose-insulin homeostasis in RYGB patients with PBH versus HCs. Despite altered postprandial glucose kinetics and higher insulin exposure, there was no evidence of impaired hepatic glucose uptake or output predisposing to PBH in RYGB patients.

A novel intraoperative “Faucet” technique for assessing patency of superficial temporal artery to middle cerebral artery bypass and for prevention of microemboli

PurposeThis technical note introduces the novel faucet technique, which enables neurosurgeons to evaluate the patency of a bypass during superficial temporal artery–middle cerebral artery bypass surgery. The technique is particularly useful when there is a lack of equipment such as micro-Doppler or indocyanine green in the operating rooms. This is often the case in Central Asian countries.MethodsThe faucet technique involves carefully examining the graft by gently opening a valve, comparable to a faucet, to observe the blood flow through the bypassed vessel. Overall, 36 procedures underwent the faucet technique for assessing the superficial temporal artery–middle cerebral artery bypass patency.ResultsThe results indicate that the bypass remained patent in all cases, as confirmed through the intraoperative faucet technique, postoperative magnetic resonance angiography, or cerebral angiography.ConclusionBy visually inspecting the blood flow through the faucet technique, surgeons can confirm the effectiveness of the graft and ensure that the bypass remains unobstructed during the surgery.

The Effectiveness of Anemia Treatment with Injectable Iron within 48 to 72 Hours before Coronary Artery Bypass Surgery on Cardiac Function and Postoperative Outcome: A Randomized Clinical Trial

Background: Anemia is considered as one of the risk factors affecting the outcomes after cardiac surgery. Accordingly, the improvement of iron deficiency anemia through injection or oral may be associated with the improvement of post-procedure results, especially the improvement of cardiovascular function. This study was aimed at investigating the effectiveness of iron treatment shortly before surgery in reducing the need for blood transfusion and improving myocardial performance parameters (left ventricular ejection fraction) in coronary bypass surgery patients. Methods: This study was a single-blind randomized clinical trial. In total, 60 candidates for coronary bypass surgery having iron deficiency anemia before the operation were randomly divided into two groups treated with injectable iron supplement (iron sucrose at a dose of 200 mg/200 ml of normal saline injected in 30 minutes) 48 to 72 hours before surgery or without therapeutic intervention. The patients were examined during and after the operation in terms of surgical outcomes. Results: Treatment with injectable iron before surgery was associated with improvement in serum hemoglobin level after surgery and a significant reduction in the need for intraoperative and postoperative transfusions. Preoperative treatment of iron deficiency was associated with a reduction in the length of hospitalization of the patients after surgery. Conclusion: Treatment of iron deficiency anemia within 48 to 72 hours before surgery will improve the condition of patients’ anemia and compensate serum hemoglobin, reduce the need for blood transfusion during surgery and the length of hospitalization of the patients after surgery.

Extracellular vesicles from human cardiac stromal cells up-regulate cardiomyocyte protective responses to hypoxia

BackgroundCell therapy can protect cardiomyocytes from hypoxia, primarily via paracrine secretions, including extracellular vesicles (EVs). Since EVs fulfil specific biological functions based on their cellular origin, we hypothesised that EVs from human cardiac stromal cells (CMSCLCs) obtained from coronary artery bypass surgery may have cardioprotective properties.ObjectivesThis study characterises CMSCLC EVs (C_EVs), miRNA cargo, cardioprotective efficacy and transcriptomic modulation of hypoxic human induced pluripotent stem cell-derived cardiomyocytes (iPSC-CMs). C_EVs are compared to bone marrow mesenchymal stromal cell EVs (B_EVs) which are a known therapeutic EV type.MethodsCells were characterised for surface markers, gene expression and differentiation potential. EVs were compared for yield, phenotype, and ability to protect hiPSC-CMs from hypoxia/reoxygenation injury. EV dose was normalised by both protein concentration and particle count, allowing direct comparison. C_EV and B_EV miRNA cargo was profiled and RNA-seq was performed on EV-treated hypoxic hiPSC-CMs, then data were integrated by multi-omics. Confirmatory experiments were carried out using miRNA mimics.ResultsAt the same dose, C_EVs were more effective than B_EVs at protecting CM integrity, reducing apoptotic markers, and cell death during hypoxia. While C_EVs and B_EVs shared 70–77% similarity in miRNA content, C_EVs contained unique miRNAs, including miR-202-5p, miR-451a and miR-142-3p. Delivering miRNA mimics confirmed that miR-1260a and miR-202/451a/142 were cardioprotective, and the latter upregulated protective pathways similar to whole C_EVs.ConclusionsThis study demonstrates the potential of cardiac tissues, routinely discarded following surgery, as a valuable source of EVs for myocardial infarction therapy. We also identify miR-1260a as protective of CM hypoxia.

Preoperative collateralization depending on posterior components in the prediction of transient neurological events in moyamoya disease.

Changes in local cerebral blood flow (CBF) are a major cause of transient neurological events (TNEs) after revascularization for moyamoya disease (MMD); however, the influence of preoperative collateral pathway development on TNEs has not yet been investigated. This study included 28 hemispheres from 28 consecutive patients with MMD who underwent surgical revascularization, including a superficial temporal artery (STA) to middle cerebral artery (MCA) bypass, between January 2014 and March 2022. The collateralization pathways included the anterior communicating artery (AcomA) collaterals, posterior communicating artery (PcomA) collaterals, transdural collaterals, posterior pericallosal anastomosis, lenticulostriate anastomosis, thalamic anastomosis, and choroidal anastomosis. These collateral pathways were analyzed to identify predictive factors significantly associated with TNEs. TNEs were observed in 11 (39.3%) hemispheres. The development of posterior pericallosal anastomosis and choroidal anastomosis was a significant independent predictor of the occurrence of TNEs after bypass surgery for MMD (P = 0.01, OR 26.9, 95% CI 1.50-480.0; P = 0.002, OR 47.6, 95% CI 2.65-856.6). The development of choroidal and posterior pericallosal anastomosis could be reliable preoperative predictors of TNEs after bypass surgery for MMD. Our results provide useful information for future studies aimed at clarifying the mechanisms underlying TNEs.

Navigating the aftermath: Risk factors of recurrence following coronary bypass surgery in Indonesia

Coronary heart disease (CHD) remains a leading cause of mortality in Indonesia, and coronary artery bypass graft (CABG) surgery is frequently employed to manage arterial blockages. Despite its efficacy, the recurrence of heart disease post-surgery is a significant concern, highlighting the need for a deeper understanding of its influencing factors. The aim of this study was to examine the factors associated with the incidence of heart disease recurrence after coronary bypass surgery. This study employed a prospective observational design, analyzing hospital claim data from Indonesia's Social Security Agency for Health, known as Badan Penyelenggara Jaminan Sosial (BPJS) Kesehatan, from 2017 to 2022. The analysis included 5,947 patients who survived CABG surgery. Multivariable logistic regression was utilized to assess the relationship between patient demographics, comorbidities, socioeconomic status, and compliance with follow-up visits, as well as their impact on the recurrence of cardiovascular disease. The study found that 24.1% of patients experienced hospitalization recurrence. Patients with irregular follow-ups were less likely to experience recurrence (adjusted odds ratio (AOR): 0.63; 95%CI: 0.51–0.78). Other significant risk factors for recurrence included being self-employed (AOR: 2.09; 95%CI: 1.72–2.55), having comorbid conditions such as disorders of fluid, electrolyte, and acid-base balance (AOR: 3.55; 95%CI: 2.97–4.24), and experiencing cerebral infarction or stroke (AOR: 10.85; 95%CI: 8.24–14.29). In contrast, older age (AOR: 0.89; 95%CI: 0.88–0.91) and the presence of non-insulin-dependent diabetes mellitus (AOR: 0.35; 95%CI: 0.29–0.42) were associated with a lower risk of recurrence. Sex did not significantly influence the risk of recurrence (AOR: 1.18; 95%CI: 0.86–1.62). In conclusion, the study indicates a considerable rate of cardiovascular disease recurrence post-CABG in Indonesia, highlighting several key risk factors. Tailored postoperative management and strict adherence to follow-up protocols are essential for mitigating recurrence. These findings offer crucial insights for improving post-CABG health management strategies in Indonesia.

Meta-Analysis of Randomised Controlled Trials Comparing Bypass and Endovascular Revascularisation for Peripheral Artery Disease.

Peripheral artery disease affects approximately 250 million people globally. Multiple randomised controlled trials have compared bypass and endovascular interventions but the optimum revascularisation approach remains unclear. The recently published BEST-CLI and BASIL-2 trials provide current and robust data addressing this question, however their findings are not concordant. This systematic review and meta-analysis provides an overview of the worldwide randomised evidence comparing bypass surgery and endovascular revascularisation in lower limb peripheral artery disease. A comprehensive literature search of MEDLINE, Embase and CENTRAL databases was performed of all time periods up to 7 May 2023 to identify randomised controlled trials comparing bypass and endovascular revascularisation for treating lower limb peripheral artery disease. The primary outcome was major amputation. Secondary outcomes were mortality, re-intervention, 30-day adverse events and 30-day mortality. Odds ratios were calculated and pooled using the random-effects model. Risk of bias was assessed using the Cochrane risk of bias 2 tool. Fourteen cohorts were identified across thirteen studies, enrolling 3840 patients. There was no significant difference in major amputation (OR 1.12; 95% CI 0.80-1.57) or mortality (OR 0.96; 95% CI 0.79-1.17) between the bypass and endovascular groups. Bypass was associated with a significant reduction in re-intervention compared with endovascular treatment (OR 0.57, 95% CI 0.40-0.82). These findings suggest that rates of major amputation and mortality are similar following bypass and endovascular interventions. Patients who undergo bypass surgery have a significantly lower re-intervention rate post-operatively.

Prediction of Successful Liberation from Continuous Renal Replacement Therapy Using a Novel Biomarker in Patients with Acute Kidney Injury after Cardiac Surgery-An Observational Trial.

An acute kidney injury (AKI) is the most common complication following cardiac surgery, and can lead to the initiation of continuous renal replacement therapy (CRRT). However, there is still insufficient evidence for when patients should be liberated from CRRT. Proenkephalin A 119-159 (PENK) is a novel biomarker that reflects kidney function independently of other factors. This study investigated whether PENK could guide successful liberation from CRRT. Therefore, we performed a prospective, observational, single-center study at the Medical University of Vienna between July 2022 and May 2023, which included adult patients who underwent cardiac surgery for a cardiopulmonary bypass; patients on preoperative RRT were excluded. The PENK levels were measured at the time of AKI diagnosis and at the initiation of and liberation from CRRT, and were subsequently compared to determine whether the patients were successfully liberated from CRRT. We screened 61 patients with postoperative AKI; 20 patients experienced a progression of AKI requiring CRRT. The patients who were successfully liberated from CRRT had mean PENK levels of 113 ± 95.4 pmol/L, while the patients who were unsuccessfully liberated from CRRT had mean PENK levels of 290 ± 175 pmol/L (p = 0.018). For the prediction of the successful liberation from CRRT, we found an area under the curve of 0.798 (95% CI, 0.599-0.997) with an optimal threshold value of 126.7 pmol/L for PENK (Youden Index = 0.53, 95% CI, 0.10-0.76) at the time of CRRT liberation (sensitivity = 0.64, specificity = 0.89). In conclusion, PENK is a novel biomarker that has the potential to predict the successful liberation from CRRT for patients with AKI after cardiac surgery.

A Behavioral Change-Based Mobile Intervention for Promoting Regular Physical Activity in Medical Rehabilitation Maintenance of Patients With Coronary Artery Disease: Controlled Trial.

Cardiac rehabilitation is known to reduce coronary artery disease (CAD) severity and symptoms, but adoption of a healthy postrehabilitation lifestyle remains challenging. Innovative eHealth solutions could help, but behavioral change-based eHealth maintenance programs for patients with CAD are scarce. RehaPlus+ aims to improve postrehabilitation outcomes with a personalized eHealth intervention built on behavioral change concepts emphasizing healthy lifestyle changes, especially regular physical activity (PA). This study aims to evaluate the effectiveness of the personalized eHealth program RehaPlus+ for promoting regular PA against usual care. A total of 169 patients with CAD who had undergone stent implantation or bypass surgery were recruited after completing center-based phase II rehabilitation. They were then divided, without blinding, into 2 groups using a quasi-experimental approach: a case manager-assisted 24-week eHealth program (RehaPlus+; n=84) and a conventional physician-assisted outpatient program (usual care; n=85). The study was designed as a noninferiority trial. RehaPlus+ participants received motivational messages twice weekly for 6 months, and the usual care group engaged in a 6-month outpatient program (twenty-four 90-minute strength and endurance training sessions). The primary outcomes, evaluated using the self-assessed Bewegungs- und Sportaktivität questionnaire, were regular PA (≥150 min/wk) and weekly activities of daily living (ADLs) 6 months after rehabilitation. Secondary outcomes involved PA during work and floors climbed weekly (measured by Bewegungs- und Sportaktivität questionnaire), psychological well-being (assessed by the 5-item World Health Organization Well-Being Index), cardiac self-efficacy, health-related quality of life (measured by the 36-Item Short Form Survey), and work ability (using the Work Ability Index). Data of 105 patients (RehaPlus+: n=44, 41.9%; usual care: n=61, 58.1%; male patients: n=80, 76.2%; female patients: n=25, 23.8%; mean age 56.0, SD 7.3 years) were available at the 6-month follow-up. At 6 months after discharge from phase II cardiac rehabilitation, the RehaPlus+ group exhibited 182 (SD 208) minutes per week of PA and the usual care group exhibited 119 (SD 175) minutes per week of PA (P=.15), with no interaction effect (P=.12). The RehaPlus+ group showed an ADL level of 443 (SD 538) minutes per week compared to the usual care group with 308 (SD 412) minutes per week at the 6-month follow-up, with no interaction effect (P=.84). The differences observed in PA and ADL levels between the RehaPlus+ and usual care groups were within the predefined 1-sided noninferiority margin, indicating that the RehaPlus+ intervention is not inferior to usual care based on these outcomes. There were no differences between the groups for all secondary outcomes (P>.05). RehaPlus+ is not inferior to the usual care program, as both groups improved PA and ADLs to a similar extent. These findings emphasize the potential of eHealth interventions to assist in maintaining healthy lifestyles after rehabilitation. ClinicalTrials.gov NCT06162793; https://clinicaltrials.gov/study/NCT06162793.

Perioperative assessment of diaphragmatic dysfunction in cardiac surgery patients and its effect on outcome; a prospective observational study

Objectives: While the assessment of the diaphragm in different clinical scenarios is quite frequent, there remains a scarcity of studies focused on assessing diaphragm dysfunction using ultrasound in cardiac surgery patients. We investigated the impact of cardiopulmonary bypass (CPB) surgery on diaphragm function and evaluated its effects on mechanical ventilation. Methodology: A prospective cohort study, on 100 consecutive adult cardiac surgery patients, was conducted at National Heart Institute. Diaphragmatic displacement (DD) or excursion and diaphragmatic thickening fraction (DTF) were measured using motion-mode ultrasound during quite normal breathing pre-operatively (the day before surgery) and post-operatively on mechanical ventilation, while the patient was fully conscious and spontaneously breathing on continuous positive airway pressure (CPAP) mode + pressure support 10 cmH2O. Then, the results were correlated to CBP time and important patient outcomes. Results: Post-operative DD was significantly less as compared to the pre-operative reading; (1.39 ± 0.42 cm vs. 2.3 ± 0.52 cm; P &lt; 0.001), as was DTF (23% ± 10% vs. 40% ± 13%; P &lt; 0.001). The incidence of diaphragmatic dysfunction post-cardiac surgery was 17% by the definition of DD &lt; 1 cm, and 49% by the definition of DTF ≤ 20%. DD was positively correlated with CBP time, as well as total ventilation time and ICU stay, indicating a negative impact on overall patient outcomes. Conclusion: The results suggest that diaphragmatic dysfunction is positively correlated with CPB time, total ventilation time and ICU stay, underscoring the importance of monitoring diaphragmatic function in post-operative patients, who are difficult to wean from mechanical ventilation with apparently normal chest X-ray, particularly those with prolonged CPB time. Keywords: cardiac surgery; cardiopulmonary bypass; diaphragm dysfunction; diaphragmatic displacement; diaphragm ultrasound; mechanical ventilation. Citation: Omara ISM, Nagi HK, Mohamed KAA, Abd El Haq HH, Awdallah FF. Perioperative assessment of diaphragmatic dysfunction in cardiac surgery patients and its effect on outcome; a prospective observational study. Anaesth. pain intensive care 2024;28(5):816−823; DOI: 10.35975/apic.v28i5.2555 Received: June 28, 2024; Reviewed: September 04, 2024; Accepted: September 06, 2024

Impact of Surgical Revascularization on Regression of Enlarged Perivascular Spaces in Adult Moyamoya Disease.

Previous studies have suggested that enlarged perivascular spaces (EPVSs) are potential radiological markers of cerebral ischemia in moyamoya disease (MMD). However, serial changes in EPVSs after surgical revascularization have not yet been clarified. We aimed to elucidate the postoperative changes in EPVSs in adult patients with MMD, clinical and radiological factors affecting the number of EPVSs, and the degree of postoperative changes. We counted the EPVSs in the centrum semiovale in each hemisphere on a T2-weighted MRI performed before surgery. EPVSs were quantified 3months and 2years after combined bypass surgery in surgically treated patients and compared with the number of EPVSs before surgery. We performed multivariate logistic regression analysis to identify the clinical and radiological factors associated with the number of EPVSs. This study included 120 hemispheres of 65 adults with MMD. Older age (P < 0.01), posterior cerebral artery (PCA) involvement (P < 0.01), and cerebral blood flow (CBF) impairment (P = 0.02) were significantly associated with a large number of EPVSs. The number of EPVSs markedly decreased at 3months and 2years after surgery compared with that before surgery (P < 0.01). PCA involvement (P = 0.04) and CBF impairment (P = 0.02) were independent predictors of the regression of EPVSs after surgery. The number of EPVSs in the centrum semiovale was closely associated with age, PCA involvement, and CBF impairment in adult patients with MMD, which remarkably regressed after surgical revascularization, especially in the hemispheres with PCA involvement and CBF impairment. EPVSs are reversible radiological markers reflecting impaired cerebral hemodynamics in adult patients with MMD.

Acute Kidney Injury after Isolated Coronary Bypass Surgery

AbstractAcute kidney injury (AKI) is among the most serious of the common postoperative complications of cardiac surgeries, which can increase the short- and long-term morbidity and mortality of patients. This study aimed to examine possible risk factors that lead to AKI. We sought to compare our AKI rates to national averages in coronary artery bypass grafting (CABG) reported by the Society of Thoracic Surgeons (STS). We reviewed our institution's data for renal failure in CABG procedures performed between January 1, 2020, and June 30, 2023. From the database, we identified 1,068 CABG patients and reviewed demographics, nonmodifiable conditions, and modifiable risk factors. The STS database uses the Risk, Injury, Failure, Loss, and End-stage renal disease definition for renal failure. Of our patient sample, 14 (1.3%) experienced renal failure. The national rate for AKI after isolated CABG was 1.9% in 2023. Chronic lung disease was a risk factor for AKI development. The mean perfusion, cross-clamp, ventilator times, and hospital stay increased in AKI patients. All patients who suffered from AKI had undergone perioperative blood transfusion. Our single-center experience with renal failure is slightly better than the national average. In our population, chronic lung disease and lower preoperative ejection fractions were associated with increased rates of AKI. Modifiable risk factors in our population included perioperative blood transfusion and increased perfusion/cross-clamp times. Lastly, AKI patients spent longer time on ventilators, increased lengths of stay, and increased postoperative mortality.

Comparable bleeding and inflammation outcomes between heparin-coated and uncoated minimal invasive extracorporeal circuits in isolated coronary artery bypass surgery - A double-blinded randomized control trial.

Minimally invasive extracorporeal circulation has been shown to be non-inferior or even superior to conventional cardiopulmonary bypass circuits in isolated coronary artery bypass grafting, but there is little evidence whether the addition of a heparin-coated circuit can further reduce the inflammatory response and amount of bleeding in these patients. A single-center randomized control trial enrolled 49 adult patients scheduled to undergo isolated coronary artery bypass grafting with minimally invasive extracorporeal circulation (MiECC) between January 2015 and December 2018. Patients were randomized 1:1 to either the heparin-coated circuit group, or the uncoated (control) circuit group. The primary outcome was chest tube output 18h after weaning from MiECC, and secondary outcomes included inflammatory (TNF-α, IL-6, IL-8, IL-10) and complement (C3a, C4d, C5a, sC5b-9) biomarkers, platelet count and function (D2D, TAT, SDC1, PF4), number of transfused blood products, and 30-day survival. Patients were randomized to undergo myocardial revascularization using heparin-coated circuits (n = 25), and to the uncoated MiECC circuit (n = 24), with comparable baseline demographics. No significant difference was observed in chest tube output and for all secondary outcomes. IL-6 and IL-8 were increased from baseline at 18h after weaning (effect size 0.29 and 0.05, respectively) and sC5b-9 was lower (effect size 0.11) in the heparin-coated than in the uncoated MiECC, although not significantly different. Compared with an uncoated MiECC circuit, heparin-coated MiECC circuit was not associated with a reduction in postoperative bleeding, transfusion, inflammation, complement activation, and platelet biomarkers, following isolated coronary artery bypass grafting.

Noninvasive ventilation outside the intensive care unit for respiratory rehabilitation after on-pump cardiac surgery: a prospective randomized controlled trial

BACKGROUND: Сardiac surgery with cardiopulmonary bypass is associated with a high risk of postoperative respiratory complications. Perioperative damage to the lungs caused by ischemia and reperfusion, mechanical ventilation, trauma, etc., is a trigger for aseptic inflammation in the lungs, and it makes compromised lungs an easy target for infection. Actively developed methods of protecting the lungs, such as lung-protective ventilation, are limited to the perioperative and resuscitation stages and do not exhaust the entire range of respiratory support required in the later stages of postoperative hospitalization. This indicates the need for methods of respiratory rehabilitation following transfer from the intensive care unit. AIM: To evaluate the effectiveness of respiratory rehabilitation using noninvasive mask lung ventilation performed outside the intensive care unit in cardiosurgical patients compared to standard breathing exercises. MATERIALS AND METHODS: This prospective, randomized, single-center study included 60 patients aged 62±12 years who underwent cardiac surgery with cardiopulmonary bypass (86±17 min) with bypass grafting of 2±1 coronary arteries and required mechanical lung ventilation for more than 6 hours following surgery. After transfer from the intensive care unit, patients in the control group (n=30) underwent standard respiratory rehabilitation, and those in the main group (n=30) additionally received four sessions of noninvasive mask lung ventilation. RESULTS: The patients in the main group had a more rapid respiratory function recovery and, thus, reduced postoperative hospitalization time (10 [8; 15]) compared to those in the standard group (14 [13; 20]). CONCLUSION: The use of noninvasive mask lung ventilation outside the intensive care unit along with the standard respiratory activation protocol is safe and speeds up respiratory rehabilitation and reduces postoperative hospitalization of patients after coronary bypass surgery.

Near Complete Biliopancreatic Segment Necrosis: A Rare and Unknown Entity Observed After Roux-en-Y Gastric Bypass-A Case Report.

Roux-en-Y gastric bypass is one of the common bariatric surgery procedures performed worldwide. Necrosis of the biliopancreatic or Roux limbs in the late period after RYGB is a rarely observed condition, the most common causes of which are postoperative adhesion, inflammatory entities, volvulus, intussusception, and internal herniations. The goal of surgical treatment is the removal of the necrotic segment and the reconstruction of biliopancreatic or gastric drainage. Here, we present a rare case in which a patient developed complete necrosis of the third and fourth segments of the duodenum and proximal jejunal limb in the postoperative seventh month after undergoing Roux-en-Y gastric bypass surgery. Necrosis occurring after RYGB surgery often affects the Roux limb, though necrosis of the biliopancreatic limb is extremely rare. The goal of surgery is to remove the necrotic segment and reconstruct the drainage. An area of ischemia is often observed in the jejunum, while a large ischemic area was noted in the present case that encompassed the third and fourth parts of the duodenum. Although in general necrosis of the Roux limb occurs due to volvulus, intussusception, or internal herniation following RYGB surgery, it must be taken into account that necrosis of the jejunal, duodenal, or complete biliopancreatic segment may occur in cases in which the underlying etiology cannot be exactly revealed.