Related Experiment Video
Updated: May 15, 2026

Electrocardiogram Recordings in Anesthetized Mice using Lead II
Published on: June 20, 2020
Prevalence and risk factors of prolonged QTc interval among Chinese patients with type 2 diabetes
Xiang Li1, Hui Ren, Zhang-rong Xu
1Diabetes Center, The 306th Hospital of PLA, Beijing 100101, China.
Objectives:
The aim of this study was to evaluate the prevalence and the risk factors of prolonged QTc interval among Chinese patients with type 2 diabetes.
Methods:
The retrospective study included 3156 outpatients from the Diabetes Centre, the 306th Hospital of PLA, during the period from September 2003 to June 2010. QT interval was measured manually in the 12-lead conventional electrocardiogram. The QT interval corrected for heart rate (QTc) was calculated using Bazett's formula. Additional demographic and laboratory data were also collected. Potential risk factors of prolonged QTc interval were assessed using multivariable regression.
Results:
The prevalence of prolonged QTc interval among Chinese patients with type 2 diabetes was 30.1%. Height (OR 0.156, 95% CI 0.032~0.748), waist circumference (OR 1.025, 95% CI 1.010~1.040), diastolic blood pressure (OR 1.016, 95% CI 1.007~1.026), postprandial glucose (OR 1.040, 95% CI 1.022~1.059), fasting insulin (OR 1.014, 95% CI 1.003~1.025), and presence of microalbuminuria (OR 1.266, 95% CI 1.033~1.551) were significant risk factors.
Conclusions:
The prevalence of prolonged QTc interval among Chinese patients with type 2 diabetes is high. Risk factors for prolongation of QTc interval were low height, high waist circumference, increasing diastolic blood pressure levels, high postprandial glucose levels, high fasting insulin levels, and presence of microalbuminuria.
Related Concept Videos
Type II Diabetes I: Introduction
Type II Diabetes Mellitus III: Clinical Manifestations and Diagnosis
Diabetes Mellitus: Type 2 and Gestational
Type II Diabetes II: Pathophysiology
Dysrhythmias II: Classification of Tachyarrhythmias
ECG Interpretation of Arrhythmias II: Atrial, Junctional and Ventricular Arrhythmias