Insulin resistance is a significant determinant of sarcopenia in advanced kidney disease.

Maintenance hemodialysis (MHD) patients display significant nutritional abnormalities. Insulin is an anabolic hormone with direct effects on skeletal muscle (SM). We examined the anabolic actions of insulin, whole-body (WB), and SM protein turnover in 33 MHD patients and 17 participants without kidney disease using hyperinsulinemic-euglycemic-euaminoacidemic (dual) clamp. Gluteal muscle biopsies were obtained before and after the dual clamp. At baseline, WB protein synthesis and breakdown rates were similar in MHD patients. During dual clamp, controls had a higher increase in WB protein synthesis and a higher suppression of WB protein breakdown compared with MHD patients, resulting in statistically significantly more positive WB protein net balance [2.02 (interquartile range [IQR]: 1.79 and 2.36) vs. 1.68 (IQR: 1.46 and 1.91) mg·kg fat-free mass-1·min-1 for controls vs. for MHD patients, respectively, P < 0.001]. At baseline, SM protein synthesis and breakdown rates were higher in MHD patients versus controls, but SM net protein balance was similar between groups. During dual clamp, SM protein synthesis increased statistically significantly more in controls compared with MHD patients ( P = 0.03), whereas SM protein breakdown decreased comparably between groups. SM net protein balance was statistically significantly more positive in controls compared with MHD patients [67.3 (IQR: 46.4 and 97.1) vs. 15.4 (IQR: -83.7 and 64.7) µg·100 ml-1·min-1 for controls and MHD patients, respectively, P = 0.03]. Human SM biopsy showed a positive correlation between glucose and leucine disposal rates, phosphorylated AKT to AKT ratio, and muscle mitochondrial markers in controls but not in MHD patients. Diminished response to anabolic actions of insulin in the stimulated setting could lead to muscle wasting in MHD patients.

Giant cell arteritis associated with intravenous zoledronic acid administration.

Bisphosphonates frequently provoke a cytokine-driven acute clinical response (ACR) characterized by fever, chills, arthralgias, and myalgias. More rarely, an association between aminobisphosphonates, such as alendronate and zoledronic acid, and rheumatologic and/or immune-mediated syndromes (RIMS) has been described. Herein we report 2 patients, one with a prior history of rheumatic disease and one without, who developed giant cell arteritis meeting the American College of Rheumatology 2022 criteria following zoledronic acid infusion. We subsequently review existing mechanistic and clinical literature supporting this link. The duration of symptoms and elevation of inflammatory markers may serve as indicators for differentiating between the more common ACR and less frequent but potentially morbid RIMS. Although the benefit of bisphosphonates will outweigh the risk of RIMS for most patients with high fracture risk, clinicians should be aware of this phenomenon to assist earlier diagnosis and treatment in affected individuals.

Improving Intravenous and Subcutaneous Insulin Overlap During Treatment of Diabetic Ketoacidosis: A Quality Improvement Project.

Objective: To reduce the frequency of insufficient overlap of intravenous (IV) and subcutaneous (SC) insulin during the treatment of diabetic ketoacidosis (DKA) as a quality improvement project. Patients and Methods: Rates of insufficient IV and SC insulin overlap (< 2-hour overlap, SC insulin given after IV insulin discontinuation, or no SC insulin given after IV insulin discontinuation) were assessed in adults with DKA treated with IV insulin at a large tertiary care referral center in Rochester, Minnesota, from July 1, 2021, to March 15, 2023. After a preintervention analysis period, an electronic medical record-based best practice advisory was introduced to notify hospital providers discontinuing IV insulin if SC long-acting insulin had not been given in the previous 2-6 hours. Demographic characteristics and clinical outcomes before and after intervention were compared. Results: A total of 352 patient encounters were included (251 in the preintervention phase and 101 in the postintervention phase). The rate of insufficient IV to SC insulin overlap decreased from (88 of 251) 35.1% before intervention to (20 of 101) 19.8% after intervention (P=.005). The rate of posttransition hypoglycemia (<70 mg/dL; to convert to mmol/L, multiply by 0.0259) decreased from (27 of 251) 10.7% to (4 of 101) 4% after intervention (P=.04). Rates of posttransition hyperglycemia (>250 mg/dL), rebound DKA, length of hospital stay, and duration of IV insulin therapy were similar before and after intervention. Conclusion: Using quality improvement methodology, the rates of insufficient IV to SC insulin overlap during treatment of DKA in a large tertiary care referral center were measured and reduced through an electronic medical record-based best practice advisory targeting hospital providers.