Laser Doppler perfusion monitoring (LDPM) is a
method to assess microvascular perfusion. A modified,
ECG-triggered LDPM system has been developed to
measure myocardial perfusion with minimum influence
from heart motion. With this method, one systolic (PLS)
and one diastolic (PLD) perfusion value is obtained.
The aim of this study was to analyse breathing-related
variations in PLS and PLD measured during open-heart
surgery. The phase delays between PLS, PLD, mean
arterial blood pressure (MAP), heart rate and, indirectly,
the respiration were determined.
MAP tended to be in phase with or precede the
variations in PLD, i.e., PLD was at a maximum at the end
of inspiration or at the beginning of expiration. No clear
relation between PLS and any of the other signals could
2006. Vol. 33, 181-184 p.