If you have had recurrent syncope (fainting spells), the tilt table test can help determine your body responses to changes in position. During the test, you lie on a table that can be moved to a nearly upright position while your symptoms, heart rate, and blood pressure are continuously monitored.

The tilt table test is designed to induce syncope under controlled conditions. The upright position during the tilt table test causes the blood to pool (collect) in the lower part of the body, especially the legs. As a result of the test, less blood returns to the heart, less blood is available for the heart to pump, and the blood pressure tends to drop. Normally, the nerves that control the function of the heart and blood vessels are able to maintain the blood pressure by increasing the heart rate and by tightening the blood vessels. In people susceptible to vasovagal syncope, these nerves do not work properly. As a result, the heart rate slows down, the blood pressure drops, and the person loses consciousness. Once the person lies flat, normal flow is restored, and he or she regains consciousness.

The tilt table test is generally safe. By design, the test may cause you to faint for a few moments. Should this happen, the table is returned quickly to a flat position and the test is stopped. Well-trained personnel are available to handle any emergency. The test takes approximately 1-1 1/2 hours.