Obesity and Diabetes Together Quietly Weaken the Heart’s Right Ventricle, Speckle-Tracking Study Finds

Researchers using two-dimensional speckle tracking imaging (2D-STI) have uncovered evidence that excess body weight and type 2 diabetes mellitus (T2DM) act together to weaken the right ventricle of the heart, long before patients notice any symptoms. The study, published in Frontiers in Clinical Diabetes and Healthcare, examined how different body mass index (BMI) levels affect right ventricular systolic and diastolic function in people with newly diagnosed T2DM, offering a fresh perspective on a cardiac chamber that is often overlooked in routine diabetes care.

The research team enrolled 128 participants, dividing them into four groups: 30 normal-weight healthy controls with BMI between 18.5 and 23.9 kg/m², 31 overweight or obese individuals without diabetes whose BMI was 24.0 kg/m² or higher, 33 normal-weight patients with newly diagnosed T2DM, and 34 overweight or obese patients with T2DM. All participants underwent comprehensive echocardiographic assessment, including conventional ultrasound measurements and advanced 2D-STI analysis of right ventricular free wall strain, early diastolic strain rate (SRe), and late diastolic strain rate (SRa).

Right ventricular function was evaluated through multiple complementary parameters. The researchers measured right ventricular free wall global longitudinal strain (RVFWS), tricuspid annular plane systolic excursion (TAPSE), right ventricular fractional area change (FAC), and the SRe/SRa ratio, which reflects the balance between early and late diastolic relaxation of the right ventricle. They also assessed the myocardial performance index (MPI) and right ventricular outflow tract Doppler velocities to capture a complete picture of right-sided cardiac performance.

The results revealed a clear stepwise pattern of right ventricular deterioration across the four groups. Normal-weight healthy controls showed the best right ventricular performance, while overweight or obese individuals without diabetes already displayed measurable impairment in RVFWS and diastolic strain rates compared with their lean counterparts. Patients with normal-weight T2DM showed further declines, and those who carried both excess weight and diabetes exhibited the most severe right ventricular dysfunction of all four groups, with the lowest RVFWS values and the most abnormal SRe/SRa ratios.

Statistical analysis confirmed that both BMI and T2DM status independently contributed to right ventricular impairment, and that the combination produced a more pronounced effect than either factor alone. Two-way analysis of variance demonstrated significant main effects of BMI and diabetes on RVFWS, SRe, SRa, and the SRe/SRa ratio, along with a significant interaction between the two factors for several parameters. This interaction suggests that obesity and diabetes do not merely add their separate harms to the right ventricle but may amplify each other’s damaging influence through overlapping metabolic and inflammatory pathways.

Multiple linear regression analysis strengthened the case for BMI as a key driver of right ventricular damage. After adjusting for age, sex, heart rate, blood pressure, and glycemic control, BMI remained an independent predictor of reduced RVFWS and abnormal diastolic strain rates in the combined patient population. The findings indicate that every additional unit of BMI carries a measurable cost for right ventricular mechanics, even in people whose diabetes is newly diagnosed and not yet complicated by advanced cardiovascular disease.

The study also explored whether conventional echocardiographic parameters could detect the same pattern of right ventricular dysfunction. While TAPSE and FAC showed some differences between groups, these traditional measures were less sensitive than 2D-STI strain parameters in distinguishing early subclinical changes. This observation underscores the value of speckle tracking technology, which tracks the movement of individual speckles within the myocardial tissue frame by frame, providing a more nuanced assessment of regional cardiac deformation than visual estimation or single-plane measurements.

Mechanistically, the researchers propose several pathways through which excess adiposity and hyperglycemia converge to injure the right ventricle. Increased visceral fat promotes chronic systemic inflammation, elevates circulating free fatty acids, and fosters insulin resistance, all of which can impair cardiomyocyte metabolism and promote myocardial fibrosis. At the same time, chronic hyperglycemia accelerates the formation of advanced glycation end products, increases oxidative stress, and disrupts calcium handling within cardiac cells. The right ventricle, with its thinner walls and greater dependence on subendocardial blood supply, may be particularly vulnerable to these combined metabolic insults.

The clinical implications of the study are significant for the millions of people worldwide living with both obesity and diabetes. Right ventricular dysfunction is increasingly recognized as a predictor of adverse outcomes in heart failure, pulmonary hypertension, and other cardiovascular conditions, yet it often goes undetected until the disease is advanced. The findings suggest that 2D-STI could serve as a practical screening tool to identify patients at risk of early right ventricular damage, allowing clinicians to intervene earlier with weight management, glycemic control, and other cardioprotective strategies before irreversible structural changes take hold.

The authors acknowledge several limitations of their work, including its cross-sectional design, which cannot establish causality or track how right ventricular function evolves over time. The study also focused on newly diagnosed patients without established cardiovascular complications, so the findings may not generalize to those with long-standing diabetes or advanced heart disease. Nevertheless, the research adds compelling evidence that the right ventricle deserves closer attention in metabolic disease, and that the combination of elevated BMI and T2DM represents a particularly potent threat to this underappreciated cardiac chamber. Future longitudinal studies using serial speckle tracking assessments could clarify how quickly right ventricular function declines with ongoing metabolic exposure and whether early interventions can preserve or restore normal cardiac mechanics.

Subject of Research: Right ventricular function in type 2 diabetes and obesity

Article Title: Assessment of the impact of body mass index on right ventricular systolic and diastolic function in patients with type 2 diabetes mellitus using two-dimensional speckle tracking imaging

Article References: Wang, W., Peng, Y., Zhao, K., Zheng, Z., Feng, J., Zou, C., Sun, Y., Lin, B., Wang, L., Hu, B., & Yang, S. (2026). Assessment of the impact of body mass index on right ventricular systolic and diastolic function in patients with type 2 diabetes mellitus using two-dimensional speckle tracking imaging. Frontiers in Clinical Diabetes and Healthcare, 7, Article 1694955. https://doi.org/10.3389/fcdhc.2026.1694955

Image Credits: AI Generated

DOI: 10.3389/fcdhc.2026.1694955

Keywords: type 2 diabetes, obesity, right ventricle, speckle tracking, echocardiography, cardiac strain, diastolic function, BMI, cardiometabolic risk, subclinical dysfunction, Assessment, impact