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Related Experiment Video

Updated: Jan 13, 2026

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Heart Rate Variability and Intrinsic Autonomic Coupling in Ehlers-Danlos Syndrome.

Waqas Alauddin1, Prajakta M Radke2, Nithya Janardhana3

  • 1Physiology, Naraina Medical College and Research Centre, Kanpur, IND.

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|January 12, 2026
PubMed
Summary
This summary is machine-generated.

Patients with Ehlers-Danlos syndrome (EDS) show significant autonomic dysregulation, including sympathetic overactivity and reduced vagal modulation. Heart rate variability (HRV) analysis reveals impaired cardiovascular autonomic integration in EDS patients.

Keywords:
autonomic nervous systemcardiovascular autonomic dysfunctiondysautonomiaehlers-danlos syndromeheart rate variabilityorthostatic intoleranceparasympathetic nervous systemparasympathetic tonepostural tachycardia syndromesympathetic nervous system

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Area of Science:

  • Cardiology
  • Neurology
  • Genetics

Background:

  • Ehlers-Danlos syndrome (EDS) is a group of inherited connective tissue disorders.
  • Autonomic dysfunction is increasingly recognized in EDS, but systematic physiologic evaluations are limited.
  • Understanding cardiovascular autonomic function in EDS is crucial for comprehensive patient care.

Purpose of the Study:

  • To characterize cardiovascular autonomic function in EDS patients using standardized autonomic testing and heart rate variability (HRV) indices.
  • To explore the intrinsic autonomic coupling by correlating resting heart rate with HRV parameters in EDS.
  • To identify potential biomarkers for autonomic dysfunction in EDS.

Main Methods:

  • A cross-sectional study involving 30 patients with EDS and 30 healthy controls.
  • Short-term HRV analysis (5-minute supine ECG) and standard autonomic testing (including head-up tilt).
  • Analysis of HRV indices using Fast Fourier Transform (FFT) algorithms and correlation analysis.

Main Results:

  • EDS patients exhibited higher resting heart rate and lower parasympathetic HRV indices (SDNN, RMSSD) compared to controls.
  • Altered frequency-domain HRV markers (LF, HF power, LF/HF ratio) indicated sympathetic predominance in EDS.
  • Orthostatic intolerance was more prevalent in EDS patients (53.3% vs 10%), and resting HR correlated with HRV measures, suggesting impaired autonomic integration.

Conclusions:

  • Patients with EDS demonstrate significant autonomic dysregulation, characterized by sympathetic predominance and diminished vagal modulation.
  • The correlation between resting heart rate and HRV indices suggests impaired cardiovascular autonomic integration in EDS.
  • HRV profiling serves as a valuable noninvasive biomarker for early identification and monitoring of autonomic dysfunction in EDS.