Simultaneous monitoring of noninvasive hemodynamic profile and capnography for tissue perfusion evaluation.

To study the simultaneous variations of end-tidal CO pressure (PetCO) and aortic blood flow (ABF) during modifications of tissue perfusion, continuous noninvasive hemodynamic monitoring and continuous recording of PetCO were performed on 30 patients under general anesthesia and artificial mechanical ventilation. The 30 patients underwent orthopedic surgery on one of the lower limbs using a hemostatic tourniquet. Deflation of the pneumatic tourniquet resulted in a rise of ABF up to 39% (P<0.