Perioperative medicine & outcomes
Change in pulse wave transit time measured using ear plethysmography is a useful substitute for finger plethysmography
Main finding · Agreement of %ΔPWTT-ear vs %ΔPWTTResult — go to the resultBias (Bland-Altman) - 0.04 % CI - 0.17 to 0.17Authors' conclusion
PWTT-ear was shorter than PWTT, but the % change in PWTT-ear was similar to that in PWTT. PWTT measured using ear plethysmography can be used as a substitute for measuring changes in PWTT.
Study context
- Population
- Patients undergoing elective hepatectomy, December 2021–April 2022311 paired readings
- Participants
- 50 patients
- Exposure
- Pulse wave transit time (PWTT) by ear plethysmography vs finger plethysmography
- Outcome
- Global agreement of all PWTT measurements
Methodological detailsmethod comparison
- Method comparison
Main finding
Agreement of %ΔPWTT-ear vs %ΔPWTT
Bias (Bland-Altman)
- 0.04 %
CI - 0.17 to 0.17
As reported in the abstract
- PWTT-ear shorter than PWTT
- 68.1 ± 15.1 ms
- Correlation %ΔPWTT-ear vs %ΔPWTT (r)
- 0.85
- Correlation P
- P < 0.001
- Percentage error (2 SD/mean %ΔPWTT)
- 4.2%
Observational data: associations, not effects.
Secondary outcomes
Trending ability during hemodynamic changes
- Conductance rate (four-quadrant plot)
- 95.9%
- Angular conductance rate (polar plot)
- 98.9%
- Radial limit
- ± 25.3
Original publication
Change in pulse wave transit time measured using ear plethysmography is a useful substitute for finger plethysmography. J Clin Monit Comput. Published 19 July 2025. doi:10.
Composed by AI from the published abstract and checked against it. How Briefs are made →