Vertical sleeve gastrectomy significantly improves cardiac and kidney MRI markers in youth-onset type 2 diabetes. A recent 12-month study demonstrates notable reductions in left ventricular mass, aortic pulse wave velocity, total kidney volume, and albuminuria, alongside enhanced tubular oxygen handling.
Investigators harmonized baseline data across three cohorts—IMPROVE-T2D, ULTRA-T2D, and SWEET-HEART—to analyze 58 participants, comparing normal-weight controls, youth with obesity without diabetes, and those with youth-onset type 2 diabetes. All individuals underwent comprehensive cardiovascular magnetic resonance imaging.
Cardiac and Kidney Phenotypes at Baseline
Baseline assessments revealed that left ventricular wall thickness was greater in both the obesity group and the type 2 diabetes group compared to normal-weight controls. Biventricular cardiac output, however, was higher only among participants in the obesity group, while aortic wall shear stress showed increases exclusively in the participants with type 2 diabetes. Cardiac MRI phenotypes otherwise did not differ significantly between the obesity and type 2 diabetes cohorts.
Participants with severely increased albuminuria—defined as a urine albumin-to-creatinine ratio of 300 mg/g or higher—exhibited greater left ventricular wall thickness and a higher resting heart rate. According to the investigators, these early cardiac perturbations tracked directly with kidney disease severity.
Twelve-Month Outcomes Following Vertical Sleeve Gastrectomy
Within the IMPROVE-T2D cohort, 19 participants underwent cardiac and kidney MRI evaluations both before and 12 months after undergoing vertical sleeve gastrectomy. Kidney MRI quantified total kidney volume alongside cortical and medullary furosemide-suppressible oxygen consumption, an index used to measure tubular oxygen handling.
At the 12-month mark, left ventricular mass decreased by 12.3 g and resting heart rate dropped by 12 beats/min. Aortic pulse wave velocity fell by 12%, total kidney volume decreased by 69.5 mL, and the urine albumin-to-creatinine ratio declined by 28.2%. Meanwhile, medullary furosemide-suppressible oxygen consumption increased by 124%, while the glomerular filtration rate remained stable.
Narongkiatikhun described the furosemide-suppressible oxygen consumption finding as the most notable result, noting that it reflects shifts in kidney physiology that conventional clinical measures like eGFR and albuminuria might fail to capture.
Future Directions and Study Limitations
Investigators noted that larger studies featuring appropriate comparison groups and extended follow-up are necessary to determine whether these early imaging changes successfully predict long-term cardiovascular and kidney outcomes. Future work will examine whether weight loss, glycemic control, or a combination of both drives these physiological changes, as well as the specific mechanisms behind the improvements observed in total kidney volume and tubular oxygen handling.
Identify the potential treatment or intervention for these changes before the irreversible target organ damage occurs.
Narongkiatikhun
Identify the potential treatment or intervention for these changes before irreversible target organ damage occurs, as noted by Narongkiatikhun.
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