Table 4. Comparison of the transcutaneous electrical stimulation vs. hypoglossal nerve stimulation.

	Non-invasive stimulation	Hypoglossal nerve stimulation
Current intensity	++	++
Efficacy	+	++
Cost	Low	High
Long term follow up	–	+
Effect on cardiovascular parameters	–	+
Application	++	–
Stimulation	Triggered, continuous	Triggered, continuous
Target	Unspecific	Specific
Type of stimulation	Bilateral	Unilateral
Adverse events	Local skin irritation	+++
Set up	Patches, skin electrodes	Surgical intervention
Current level of evidence according to latest guidelines (49)	C	C

+, more or available; –, less or unavailable.