Clinical experiences of laser Doppler blood flow sensor for thoracic paravertebral nerve block

A thoracic paravertebral nerve block (TPVB) is a technique where a bolus of local anesthetic is injected in the paravertebral space and can block ipsilateral somatic and sympathetic nerve blocks [1]. That is to say, we can confirm the increase of blood flow if the procedure of TPVB is successful. A laser Doppler flow sensor can measure a peripheral blood flow in the living by applying the optical disc technology. However, we cannot sometimes measure the peripheral blood flow exactly because of noise.

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