Symptoms that point to autonomic dysfunction
Autonomic symptoms are often dismissed as anxiety or dehydration. Typical patterns include light-headedness or blackouts on standing, a rapid heartbeat, exercise intolerance, heat intolerance, reduced or excessive sweating, bloating, constipation, urinary urgency and sexual dysfunction. Symptoms may worsen after meals, in heat, during menstruation or after standing for long periods.
The pattern matters. Postural orthostatic tachycardia syndrome (POTS) causes symptoms on standing with an exaggerated heart-rate rise. Orthostatic hypotension causes a fall in blood pressure. Vasovagal syncope causes intermittent fainting with a characteristic prodrome. Autonomic neuropathy may accompany diabetes, vitamin B12 deficiency, amyloidosis, Parkinson's disease or certain medicines.
- Dizziness, visual greying or fainting on standing
- Palpitations, tremor or breathlessness with upright posture
- Heat intolerance or abnormal sweating
- Early fullness, bloating, constipation or urinary symptoms
- Fatigue or exercise intolerance without another explanation
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How the assessment is structured
The consultation begins with a detailed history of timing, triggers, fluid and salt intake, sleep, menstrual cycle, medicines and other medical conditions. Blood pressure and heart rate are checked lying and standing, and a focused neurological examination looks for neuropathy or parkinsonism.
Initial tests may include ECG, blood count, glucose, thyroid, vitamin B12, kidney function, iron studies and medication review. Tilt-table testing, heart-rate variability, sweat testing or formal autonomic function tests are arranged at an affiliated centre when the diagnosis remains unclear or when the result will guide treatment.
Management and realistic expectations
Treatment starts with non-drug measures: adequate fluids, salt intake where safe, slow position changes, compression garments, exercise conditioning and avoiding prolonged standing or hot environments. These are adjusted for heart, kidney and blood-pressure conditions.
Medication may be considered for selected patients, for example fludrocortisone, midodrine or beta-blockers, but the choice depends on the subtype and comorbidities. Treating the underlying cause, reviewing aggravating medicines and coordinating with cardiology, endocrinology or gastroenterology are part of the plan. Improvement is often gradual, and the aim is function and safety rather than a permanent cure.
| Pattern | Typical clue | Initial focus |
|---|---|---|
| POTS | Heart rate rises on standing with symptoms | Fluids, salt, exercise, trigger review |
| Orthostatic hypotension | Blood pressure falls on standing | Medicines, hydration, compression, cause |
| Vasovagal syncope | Prodrome, intermittent fainting | Triggers, safety, reassurance, selected therapy |
| Autonomic neuropathy | Sweating, digestion, bladder, neuropathy | Identify diabetes, B12, amyloid or other cause |
Access and booking
Appointments are at Kathmandu Neurology Clinic & Cognitive Center, 117 Lal Durbar Marg, Kathmandu, opposite Yak & Yeti Hotel. Call +977-9747736624 or use /book-appointment. Bring prior reports, imaging, seizure or symptom records and a medication list. Neurophysiology tests are arranged at an affiliated laboratory or hospital when indicated; the consultation confirms whether the test is appropriate and explains the result.