Two-plane EIT may improve lung ventilation mapping in horses: full analysis

A new study in Equine Veterinary Journal suggests thoracic electrical impedance tomography in horses may become more informative when clinicians move beyond the traditional single electrode belt. According to the study summary, a two-plane electrode configuration produced a more vertically uniform representation of ventilation and better captured peripheral lung fields than the standard one-plane approach, based on computational modeling and in vivo work in 20 horses. That matters because conventional EIT has been useful in horses for years, but it still represents only a limited slice of the thorax. (pubmed.ncbi.nlm.nih.gov)

The work builds on a longer arc of equine EIT development. Earlier studies established that EIT could feasibly assess ventilation distribution in standing horses, and subsequent work extended the technology into applications including airflow assessment, anesthesia monitoring, tidal volume estimation, and evaluation of horses with cardiopulmonary disease. In 2022, a veterinary consensus statement described thoracic EIT as a promising clinical monitoring tool and singled out two-plane EIT as an emerging advance because it can detect impedance changes over a greater craniocaudal volume of tissue and be reconstructed into multiple transverse slices or 3-D images. (pubmed.ncbi.nlm.nih.gov)

That background is important for understanding what changed here. Standard single-plane EIT in horses generates a two-dimensional image from a lens-shaped region of the thorax, which means structures farther from the electrode plane are represented less completely. The newer approach uses two electrode planes spaced apart; in related 2024 validation work from overlapping investigators, two-plane data collected from 20 standing sedated horses were reconstructed into cranial, middle, and caudal lung slices, and the distribution of ventilation in those slices corresponded with topographical equine lung anatomy. The new Equine Veterinary Journal paper appears to push that concept further by showing the two-plane configuration offers a more vertically uniform ventilation map and better peripheral lung representation than the legacy setup. (frontiersin.org)

There does not appear to be a dedicated institutional press release or broad industry reaction available yet, but the expert backdrop is notable. The 2022 consensus group, which included several researchers from the same broader EIT network, said veterinary thoracic EIT needs standardized approaches to data collection, analysis, interpretation, and nomenclature to make studies comparable and clinically meaningful. That same statement framed two-plane technology as a hoped-for route toward “true 3-D imaging” of the whole lung field, though it also noted the method was still in development rather than adopted into routine practice at that time. In other words, the new paper fits an expert-defined priority area rather than arriving out of nowhere. (frontiersin.org)

Why it matters: For veterinary professionals, especially equine internists, anesthesiologists, and respiratory researchers, the practical issue is whether EIT can reflect regional lung mechanics accurately enough to guide decisions. Horses are a challenging species for thoracic imaging because conventional modalities can miss subtle or deep parenchymal changes, while advanced imaging is often impractical in adult equine patients. If two-plane EIT better represents peripheral and vertically distributed ventilation, it could strengthen the technology’s value for monitoring horses with asthma, peri-anesthetic ventilation mismatch, recruitment maneuvers, or other disorders where regional heterogeneity matters. It may also improve the quality of research data by reducing the anatomic blind spots inherent in single-plane reconstruction. (pmc.ncbi.nlm.nih.gov)

There are still caveats. The available descriptions indicate the findings come from modeling plus in vivo testing in 20 horses, which is meaningful for a technical validation study but not the same as proving clinical benefit in diseased populations. And as the consensus statement emphasized, EIT results are sensitive to choices around belt design, electrode number, drive pattern, frame rate, reconstruction algorithm, and electrode position. That means the headline finding is promising, but translation into practice will require reproducible protocols and outcome-focused studies, not just better images. (pubmed.ncbi.nlm.nih.gov)

What to watch: Watch for follow-on studies testing two-plane EIT in horses with naturally occurring respiratory disease, during anesthesia, or during exercise-related respiratory assessments, as well as for any movement by device developers and consensus groups to formalize protocols that would let practices and referral centers use the method consistently. (frontiersin.org)