Patients with uncomplicated type 1 diabetes mellitus and normal cardiorespiratory fitness exhibited higher supine systolic blood pressure and greater sympathetic activation during orthostatic tests compared to healthy controls.
Cross-Sectional (n=45)
No
Do patients with uncomplicated type 1 diabetes mellitus and normal V̇O2max exhibit altered cardiovascular autonomic function during orthostatic testing compared to healthy controls?
Patients with uncomplicated type 1 diabetes and normal cardiorespiratory fitness exhibit subclinical cardiovascular autonomic dysfunction, characterized by higher systolic blood pressure and greater sympathetic activation during orthostatic stress.
Effect estimate: Mean difference 9.3 (95% CI 1.4-17.1)
Absolute Event Rate: 131.6% vs 122.4%
p-value: p=0.022
Abstract Purpose Cardiovascular autonomic neuropathy remains underdiagnosed in type 1 diabetes mellitus, posing a risk for severe complications, particularly in patients with lowered V̇O 2max , compared to controls. This study aimed to determine whether heart rate variability during cardiovascular autonomic reflex tests reveals early signs of cardiovascular autonomic neuropathy in patients with uncomplicated type 1 diabetes mellitus and normal cardiovascular fitness, compared to healthy controls. Methods A type 1 diabetes mellitus group ( n = 14) with no other diagnosed diseases (diabetes duration 15 ± 7 years) and a control group ( n = 31) underwent deep breathing test, passive orthostatic test, and cardiopulmonary exercise test. Participants were assessed for heart rate variability, heart rate, blood pressure, and V̇O 2max (mL/min/kg). Results Participant characteristics, including V̇O 2max (mL/min/kg), showed no significant differences. The type 1 diabetes mellitus group had higher systolic blood pressure during the supine phase of the orthostatic test than healthy controls (131.6 ± 14.7 mmHg vs. 122.4 ± 10.8 mmHg, p = 0.022). After 5 mins in the upright position, systolic blood pressure (132.2 ± 20.6 mmHg vs. 118.7 ± 11.7 mmHg, p = 0.036), heart rate (85 (76; 89) bpm vs. 75 (72; 83) bpm, p = 0.013), and the root mean square of successive RR interval differences (20.22 (11.22; 27.42) vs. 27.11 (19.90; 35.52), p = 0.033) were significantly different compared to controls. Conclusion Patients with uncomplicated type 1 diabetes mellitus, despite having normal cardiorespiratory fitness, exhibited higher systolic pressure and greater sympathetic activation in orthostatic tests, suggesting subclinically altered cardiovascular autonomic function.
Sorola et al. (Tue,) conducted a cross-sectional in Uncomplicated type 1 diabetes mellitus (n=45). Type 1 diabetes mellitus vs. Healthy controls was evaluated on Systolic blood pressure during the supine phase of the orthostatic test (mmHg) (Mean difference 9.3, 95% CI 1.4-17.1, p=0.022). Patients with uncomplicated type 1 diabetes mellitus and normal cardiorespiratory fitness exhibited higher supine systolic blood pressure and greater sympathetic activation during orthostatic tests compared to healthy controls.