A structured evaluation of fainting and near-fainting, distinguishing benign vasovagal causes from rhythm-related, structural, or autonomic causes that need targeted treatment. Performed by Ilyas K. Colombowala, MD, FACC, FHRS, board-certified cardiac electrophysiologist serving Northwest Houston and surrounding communities.
A new procedure center at the Texas Medical Center
The Advanced Cardiovascular Institute at the Texas Medical Center, at 6624 Fannin St, Houston, TX 77030, opens in June 2026, our new ambulatory surgery center for cardiac electrophysiology. It will perform catheter ablation, pacemaker, ICD, and loop recorder procedures in the Texas Medical Center for the comfort and convenience of our patients.
Consultations and follow-up continue at our Hargrave Rd clinic in Northwest Houston, with procedures performed at the most appropriate location: Houston Methodist Willowbrook, Houston Methodist Cypress, Baylor St. Luke’s Medical Center, St. Luke’s The Vintage, Memorial Hermann Memorial City, or the new TMC ASC. Learn more → or call (832) 478-5067 to schedule.
Why syncope deserves an EP visit
Most fainting is benign. Vasovagal syncope is the most common cause, particularly in younger patients with classic triggers (prolonged standing, heat, emotional stress, blood draws). But some syncope is the first warning sign of a dangerous arrhythmia, an autonomic disorder like POTS, or an underlying structural heart problem.
The job of an EP visit is to sort which kind of syncope you have and pick the right next step, often after the cardiology workup has been negative.
How we evaluate
The workup is layered. We start with a careful history (often the most informative single step), a physical exam, and a 12-lead ECG. Based on what we find we may add:
Tilt-table testing: diagnoses vasovagal syncope, POTS, and orthostatic hypotension with a controlled provocation in the office
Ambulatory rhythm monitoring: Holter, patch, mobile telemetry, or implantable loop recorder depending on symptom frequency
Echocardiogram: rules out structural heart disease
Electrophysiology study: for selected patients where a rhythm cause is strongly suspected but not yet documented
Genetic testing: when an inherited arrhythmia syndrome is on the differential
Treatment depends on the cause
Vasovagal syncope is treated with lifestyle measures (hydration, salt, counter-pressure maneuvers) and sometimes medication. POTS responds to a structured program of fluid expansion, compression, exercise reconditioning, and selected medications. Rhythm-related syncope is treated with pacing, ablation, or an ICD depending on the underlying problem. The right answer follows from the diagnosis, not the symptom.
Most fainting is benign, but you should see a cardiac electrophysiologist if you faint without warning, faint during exertion or while lying down, have heart disease or a family history of sudden death, or if a standard cardiology workup has not explained your episodes. The goal of the visit is to separate harmless fainting from the kind that signals a rhythm or heart problem.
What causes syncope (fainting)?
The most common cause is vasovagal syncope, a reflex drop in heart rate and blood pressure triggered by things like prolonged standing, heat, or emotional stress. Other causes include heart rhythm disorders, autonomic conditions such as POTS, and structural heart problems. Sorting which type you have is the central job of the evaluation.
How is syncope evaluated?
The workup is layered. It starts with a careful history, a physical exam, and a 12-lead ECG, which together are often the most informative steps. Depending on findings, it may add tilt-table testing, ambulatory rhythm monitoring, an echocardiogram, an electrophysiology study, or genetic testing. The aim is to match the test to the most likely cause.
What is a tilt-table test?
A tilt-table test reproduces fainting under controlled conditions in the office. You lie on a table that is slowly tilted upright while your heart rate and blood pressure are monitored. It helps diagnose vasovagal syncope, POTS, and orthostatic hypotension, and it is one of several tools chosen based on your history.
How is syncope treated?
Treatment follows the diagnosis, not the symptom. Vasovagal syncope is managed with hydration, salt, counter-pressure maneuvers, and sometimes medication. POTS responds to a structured program of fluids, compression, and exercise reconditioning. Rhythm-related syncope is treated with pacing, ablation, or an ICD depending on the underlying problem.
