Comparing Electrical Modalities Carefully

TENS, vagus nerve stimulation (VNS) and PEMF refer to different ways of delivering a signal. TENS applies current through skin electrodes; VNS targets vagal pathways through different possible routes; PEMF describes pulsed magnetic-field exposure. Delivery route alone does not establish comparative benefit or safety.

Evidence is not interchangeable

A chronic non-cancer pain device review pooled selected heterogeneous studies, including TENS combinations and PEMF for low-back pain, and asked for larger diverse cohorts. It does not demonstrate that one modality outperforms the others or works for every condition. An inflammatory-reflex review concerns neural immune regulation, not head-to-head pain-device outcomes.

What a comparison should measure

Each device would need a specified waveform or exposure, target, population and comparator. Patient-relevant pain and function, adverse effects and adherence should be reported alongside physiological measures. “Programmable” means parameters can be varied, not that each setting produces a predictable therapeutic outcome.

A common sensor-and-software architecture is a proposal, not evidence of one engine treating multiple diseases. Postoperative symptoms, fractures and biofilms would each require independent sources and indication-specific testing; they cannot be inferred from this pain review.

TENS, VNS and PEMF use different forms of stimulation TENS: stimulation through skin electrodes

VNS: targeting vagal pathways

PEMF: exposure to pulsed electromagnetic fields

What the linked references do not establish: The pain-device review and inflammatory-reflex review do not establish that TENS, VNS and PEMF are interchangeable.