Imaging photoplethysmography for assessment of chronic pain patients

U. Rubins, Z. Marcinkevics, I. Logina, A. Grabovskis, E. Kviesis-Kipge

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

8 Citations (Scopus)


In present pilot study application of multi-spectral imaging photoplethysmography for assessment of chronic pain patients during topical skin heating test was proposed. Photoplethysmography signal was recorded at 420nm, 530nm and 810nm illumination from the skin and corresponding perfusion indexes and perfusion maps were calculated. The novel parameter-PPGflare index was introduced and compared in neuropathic patients and healthy volunteers. Preliminary results suggest that neuropathic patients exhibited significantly lower PPGflare index, and that local heating substantially change PPG waveform at heat exposed skin region. Present study emphasizes advantages of imaging photoplethysmography as a simple and cost-effective alternative to Laser Doppler with promising clinical potential in assessment of neuropathic patients. In this respect, we believe that our study adds novel information to the field of existing chronic pain diagnostics.

Original languageEnglish
Title of host publicationOptical Diagnostics and Sensing XIX
Subtitle of host publicationToward Point-of-Care Diagnostics
EditorsGerard L. Cote
ISBN (Electronic)9781510624122
Publication statusPublished - 2019
EventOptical Diagnostics and Sensing XIX 2019: Toward Point-of-Care Diagnostics - San Francisco, United States
Duration: 4 Feb 20195 Feb 2019

Publication series

NameProgress in Biomedical Optics and Imaging - Proceedings of SPIE
ISSN (Print)1605-7422


ConferenceOptical Diagnostics and Sensing XIX 2019: Toward Point-of-Care Diagnostics
Country/TerritoryUnited States
CitySan Francisco


  • Blood microcirculation
  • Chronic pain
  • Imaging photoplethysmography
  • Neuropathic pain
  • Pain assessment
  • Perfusion monitoring
  • Remote photoplethysmography
  • Tissue perfusion

Field of Science*

  • 3.2 Clinical medicine

Publication Type*

  • 3.1. Articles or chapters in proceedings/scientific books indexed in Web of Science and/or Scopus database


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