Table 1.

Comparison of relative merits of tilt table test and implantable loop recorders

	TTT	ILR
Advantages	Noninvasive, nonexpensive	Reliable diagnosis of arrhythmias causing presyncope or syncope
	Differentiates between reflex syncope, orthostatic hypotension, carotid sinus hypersensitivity and pseudosyncope
	Assesses function of autonomic system
Disadvantages	Significant false negative response (up to 30%)	Invasive
	Pharmacological chellenge may be required	Cannot assess nonarrhythmic causes of syncope

TTT: Tilt table test; ILR: Implantable loop recorder.