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What Is Syncope?

Syncope is a transient, self-limited loss of consciousness caused by a temporary reduction in blood flow to the brain. It is commonly known as fainting. Presyncope refers to the feeling of impending faintness without actual loss of consciousness — lightheadedness, dizziness, dimming of vision, or near-blackout. Syncope is common, accounting for approximately 1–3% of emergency department visits. While most episodes are benign, syncope can be the first sign of a serious cardiac arrhythmia or structural heart problem. Determining the cause is critical, as cardiac syncope carries increased risk of sudden cardiac death.

Types and Causes of Syncope

Vasovagal Syncope (Neurocardiogenic Syncope) — The most common cause of fainting, particularly in young people. Triggered by prolonged standing, emotional distress, pain, heat exposure, or dehydration. The vagus nerve causes a sudden drop in heart rate and blood pressure. Typical prodrome includes nausea, lightheadedness, sweating, and dimming of vision before losing consciousness. Recovery is rapid and complete.

Orthostatic Hypotension — A drop in blood pressure upon standing, causing lightheadedness or syncope within seconds to minutes of position change. Common in older adults, patients on antihypertensive medications or diuretics, and patients with autonomic neuropathy from diabetes or Parkinson’s disease.

Cardiac Arrhythmia — Syncope caused by an abnormally fast (tachyarrhythmia) or slow (bradyarrhythmia) heart rate. High-degree AV block, sick sinus syndrome, and ventricular tachycardia are the most concerning arrhythmic causes. Arrhythmic syncope typically occurs without prodrome, may happen in any position, and may be associated with palpitations or post-event disorientation.

Structural Cardiac Syncope — Severe aortic stenosis, hypertrophic obstructive cardiomyopathy (HOCM), and pulmonary embolism can cause exertional or positional syncope by obstructing cardiac output. Exertional syncope is a red flag warranting urgent cardiac evaluation.

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Red Flags Requiring Urgent Evaluation

Certain features of syncope indicate high-risk presentations requiring prompt cardiology evaluation: syncope occurring during exertion, syncope without prodrome or warning, syncope associated with palpitations, syncope in a patient with known heart disease or family history of sudden cardiac death, recurrent unexplained syncope, and syncope resulting in serious injury. These presentations suggest a cardiac etiology that must be ruled out urgently.

Syncope Evaluation

A structured syncope evaluation begins with a detailed history, physical examination, lying and standing blood pressure measurements, and a 12-lead EKG. Echocardiography assesses for structural heart disease including valvular abnormalities and cardiomyopathy. Ambulatory cardiac monitoring — Holter monitors, extended event recorders, or implantable loop recorders (ILR) — is critical for capturing arrhythmias that occur infrequently. Tilt-table testing is used to evaluate for vasovagal or orthostatic syncope when clinical history is suggestive. In selected patients, electrophysiology study (EPS) is performed to assess the cardiac conduction system and induce arrhythmias under controlled conditions.

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Treatment of Syncope

Treatment is directed at the underlying cause. Vasovagal syncope is managed with education about triggers, counterpressure maneuvers (leg crossing, tensing limb muscles at onset of prodrome), increased salt and fluid intake, and compression stockings. Orthostatic hypotension is treated with medication adjustment, volume expansion, and fludrocortisone or midodrine in refractory cases. Bradyarrhythmias causing syncope are treated with permanent pacemaker implantation. Ventricular tachycardia or fibrillation causing syncope is treated with an implantable cardioverter-defibrillator (ICD). Structural causes — such as aortic stenosis or HOCM — are managed with appropriate intervention once diagnosed.

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Why Choose Cross County Cardiology?

• Board-Certified, FACC Cardiologists — Fellowship of the American College of Cardiology credentialed physicians
• Affiliated with Mount Sinai & Hackensack Meridian Health — Academic medical center connectivity for electrophysiology and structural referrals
• 5 NJ Locations — Secaucus, Edgewater, Teaneck, Hoboken, and North Bergen
• Same-Week Appointments Available — Fast access without long waits
• Comprehensive Cardiac Monitoring — Holter monitors, event recorders, echocardiography, and tilt-table testing coordination on-site and through affiliated centers

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Frequently Asked Questions

Is fainting always dangerous?

Not always — vasovagal syncope, the most common type, is benign and not associated with increased mortality. However, cardiac syncope caused by arrhythmias or structural heart disease does carry increased risk of sudden cardiac death and requires thorough evaluation. The challenge is that clinical features alone cannot always distinguish benign from dangerous syncope. Any loss of consciousness — especially recurrent, exertional, or injury-causing episodes — warrants formal cardiac evaluation.

What is an implantable loop recorder?

An implantable loop recorder (ILR) is a small cardiac monitor — approximately the size of a USB drive — inserted just under the skin of the chest in a minimally invasive outpatient procedure. It records the heart’s electrical activity continuously for up to 3 years and transmits data wirelessly to your cardiologist. ILR is the most sensitive tool for detecting intermittent arrhythmias in patients with unexplained syncope where shorter-term monitoring has not captured an episode.

What is tilt-table testing?

Tilt-table testing is a diagnostic procedure in which the patient is secured to a motorized table that tilts from horizontal to upright position while heart rate and blood pressure are monitored continuously. It is designed to reproduce the conditions that trigger vasovagal syncope or orthostatic hypotension in a controlled environment. A positive test — syncope or presyncope with the characteristic vasovagal heart rate and blood pressure changes — confirms the diagnosis and guides management.

Can syncope be caused by medications?

Yes. Antihypertensive medications (beta-blockers, diuretics, calcium channel blockers, ACE inhibitors), alpha-blockers, nitrates, and certain antiarrhythmics can all lower blood pressure or heart rate sufficiently to cause orthostatic hypotension or syncope, particularly in older patients or those who are volume-depleted. A thorough medication review is part of every syncope evaluation. Dosage adjustment or medication changes may resolve syncope without additional intervention.

Should I drive after a fainting episode?

Driving restrictions after syncope vary by cause and jurisdiction. In New Jersey, patients with unexplained or recurrent syncope are generally advised not to drive until the cause has been identified and treated, or until a specified period free of episodes has passed. Patients with cardiac syncope due to a dangerous arrhythmia have stricter restrictions. Your cardiologist will provide specific guidance based on the diagnosis and applicable state regulations.