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Diagnostic Tests – Tilt-Table Testing
What Is Tilt-Table Testing?
Tilt-table testing is a diagnostic procedure used to evaluate unexplained syncope, particularly when fainting episodes may be related to autonomic dysfunction or abnormal cardiovascular reflexes. The test involves monitoring blood pressure and heart rate while the patient is gradually tilted from a lying to an upright position. By changing the angle of the patient’s body, clinicians can observe how the cardiovascular system responds to positional changes that mimic everyday standing.
How Is Tilt-Table Testing Performed?
The patient is secured on a motorized table that can be tilted to various angles. Blood pressure and heart rate are recorded at baseline and during each positional shift. The test attempts to reproduce symptoms such as dizziness, lightheadedness, or syncope.
An abnormal result occurs when tilting produces:
- Syncope or near-syncope
- Significant dizziness
- An inappropriate or exaggerated drop in blood pressure
- Inadequate compensatory heart rate response (e.g., inappropriate bradycardia)
To enhance sensitivity, medications such as isoproterenol or nitroglycerin may be used as provocative agents, increasing the likelihood of triggering symptoms in susceptible patients.
When Is Tilt-Table Testing the Correct Answer?
Tilt-table testing is appropriate in cases of unexplained syncope, particularly when initial evaluation (history, physical exam, EKG, and routine labs) does not reveal a clear cause. It is especially valuable when syncope appears related to orthostatic changes, such as:
- Episodes of fainting when standing
- Symptoms consistent with neurocardiogenic (vasovagal) syncope
- A paradoxical or inappropriate bradycardia upon standing
- Suspected autonomic dysfunction
In these situations, a tilt-table test helps confirm whether syncope is due to abnormal autonomic reflexes rather than cardiac arrhythmias, structural disease, or neurologic disorders.
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