Several kinds of inotropes have been used in critically ill patients to improve hemodynamics and renal dysfunction after cardiac surgery; however, the treatment strategies for reducing mortality and increasing renal protection in patients who underwent cardiac surgery remain controversial. Therefore, we performed a comprehensive network meta-analysis to overcome the lack of head-to-head comparisons. A systematic database was searched up to 31 December 2020, for randomized controlled trials that compared different inotropes on mortality outcomes and renal protective effects after cardiac surgery. A total of 29 trials were included and a frequentist network meta-analysis was performed. Inconsistency analyses, publication bias, and subgroup analyses were also conducted. Compared with placebo, use of levosimendan significantly decreased the risks of mortality (odds ratio (OR): 0.74; 95% confidence interval (CI): 0.56–0.97) and risk of acute renal injury (OR: 0.61; 95% CI: 0.45–0.82), especially in low systolic function patients. Use of levosimendan also ranked the best treatment based on the P-score (90.1%), followed by placebo (64.5%), milrinone (49.6%), dopamine (49.5%), dobutamine (29.1%), and fenoldopam (17.0%). Taking all the available data into consideration, levosimendan was a safe renal-protective choice for the treatment of patients undergoing cardiac surgery, especially for those with low systolic function.

BACKGROUND AND PURPOSEAppetite suppression induced by amphetamine has been attributed to its inhibition of neuropeptide Y (NPY) neurons and activation of pro-opiomelanocortin (POMC) neurons in the hypothalamus. This study examined whether STAT3 was involved in these actions of amphetamine. EXPERIMENTAL APPROACHRats were given amphetamine daily for 4 days. Changes in the expression of NPY, POMC, melanocortin MC3 receptors, PI3K and STAT3 in the hypothalamus were assessed by RT-PCR and Western blotting. Antisense oligonucleotides to STAT3 were also used. KEY RESULTSExpression of NPY decreased with a maximum effect day 2 of amphetamine treatment. Expression of POMC, MC3 receptors, PI3K and STAT3 increased with a maximum response on day 2. Moreover, phosphorylation of STAT3 and its DNA binding activity increased and was expressed in a similar pattern. Infusion (i.c.v.) of STAT3 antisense at 60 min before amphetamine treatment, partly blocked amphetamine-induced anorexia and modulated expression of NPY, POMC, MC3 receptors and PI3K, indicating the involvement of STAT3 in amphetamine-treated rats. CONCLUSIONS AND IMPLICATIONSHypothalamic PI3K-STAT3 signalling participated in the regulation of NPY-and POMC-mediated appetite suppression. These findings may contribute to a better understanding of anorectic drugs.

Prevention of cardiorenal syndrome through treatment with inotropic agents remains challenging. This network meta-analysis evaluated the safety and renoprotective effects of inotropes on patients with advanced heart failure (HF) using a frequentist random-effects model. A systematic database search was performed until 31 January 2021, and a total of 37 trials were included. Inconsistency, publication bias, and subgroup analyses were conducted. The levosimendan group exhibited significantly decreased mortality compared with the control (odds ratio (OR): 0.62; 95% confidence interval (CI): 0.46–0.84), milrinone (OR: 0.50; 95% CI: 0.30–0.84), and dobutamine (OR: 0.75; 95% CI: 0.57–0.97) groups. In terms of renal protection, levosimendan (standardized mean difference (SMD): 1.67; 95% CI: 1.17–2.18) and dobutamine (SMD: 1.49; 95% CI: 0.87–2.12) more favorably improved the glomerular filtration rate (GFR) than the control treatment did, but they did not significantly reduce the incidence of acute kidney injury. Furthermore, levosimendan had the highest P-score, indicating that it most effectively reduced mortality and improved renal function (e.g., GFR and serum creatinine level), even in patients with renal insufficiency. In conclusion, levosimendan is a safe alternative for protecting renal function on cardiorenal syndrome in patients with advanced HF.

The prevailing view is that ClC-Ka chloride channel (mouse Clc-k1) functions in thin ascending limb for urine concentration, whereas ClC-Kb (mouse Clc-k2) in thick ascending limb (TAL) for salt reabsorption, respectively. Mutations of ClC-Kb cause classic Bartter syndrome with renal salt wasting with onset from perinatal to adolescent.We study the roles of Clc-k channels in perinatal mouse kidneys using constitutive or inducible kidney-specific gene ablation and 2-D and advanced 3-D imaging of optically cleared kidneys. We show that Clc-k1 and -k2 are broadly expressed and colocalized in perinatal kidneys. Deletion of Clc-k1 and -k2 reveals that both participate in NKCC2-and NCC-mediated NaCl reabsorption in neonatal kidneys. Embryonic deletion of Clc-k2 causes tubular injury and impairs renal medulla and TAL development. Inducible deletion of Clc-k2 begins after medulla maturation produces mild salt wasting resulting from reduced NCC activity. Thus, both Clc-k1 and -k2 contribute to salt reabsorption in TAL and DCT in neonates, potentially explaining less severe phenotypes in classic Bartter. As opposed to the current understanding that salt wasting in adult Bartter patients is due to Clc-k2 deficiency in adult TAL, our results suggest that it is mainly originated from medulla and TAL defects during development. Table 2. Plasma and urine biochemistries of 8-week-old Clc-k1-null and Clc-k2-null mice WT Clc-k1 -/-WT Clc-k2 -/-Plasma BUN (mg/dL) 29.7±1.6 26.6±2.0 30.4±1.7 63.6±3.0** Creatinine (mg/dL) 0.25±0.03 0.29±0.03 0.26±0.01 0.39±0.03** Table 3 Plasma and urine biochemistries in 10-week-old inducible Clc-k2 deficient mice.

No abstract