Cardiovascular Autonomic Neuropathy in Systemic Lupus Erythematosus

Area of Science:

• Rheumatology
• Cardiology
• Neurology

Background:

• Systemic Lupus Erythematosus (SLE) is a complex autoimmune disease with potential multi-organ involvement.
• Cardiovascular complications are a significant concern in SLE patients.
• Autonomic nervous system dysfunction may contribute to cardiovascular morbidity in SLE.

Purpose of the Study:

• To evaluate cardiovascular autonomic function in patients with Systemic Lupus Erythematosus (SLE).
• To assess autonomic function using simple, non-invasive tests.
• To determine the prevalence and type of autonomic dysfunction in SLE.

Main Methods:

• A case-control study involving 50 SLE patients and 50 age/sex-matched controls (18-50 years old).
• Parasympathetic function assessed via heart rate response to Valsalva maneuver, deep breathing, and standing.
• Sympathetic function evaluated by blood pressure response to standing and hand-grip test (HGT).

Main Results:

• SLE patients exhibited higher minimum resting heart rate and diastolic blood pressure.
• Significantly lower heart rate variation with deep breathing, expiratory-inspiratory ratio, and 30:15 ratio in SLE patients.
• Reduced diastolic blood pressure change in response to HGT and higher prevalence of autonomic impairment (60%) in SLE patients, predominantly parasympathetic dysfunction (27/30).

Conclusions:

• Autonomic dysfunction is a common finding in Systemic Lupus Erythematosus (SLE).
• Parasympathetic impairment is more prevalent than sympathetic dysfunction in SLE patients.
• Non-invasive autonomic function tests are valuable for assessing SLE patients.