LA group used a class IV Multiwave Locked System (MLS) laser (Mphi laser, ASA Srl, Vicenza, Italy). MLS laser is a class IV NIR laser with two synchronized sources (905 nm with 75 W peak power, pulsed mode; 808 nm with power 1 W, continuous mode). Both laser beams were synchronized, the locked waves work with the range 1-2000 Hz.

In LA group, based on clinical experience, we choose 5 acupoints on the affected side. It includes ST2(Si Bai), ST4(Di Cang), ST6(Jia Che), GB14(Yang Bai), GB20(Feng chi). We choose 7 acupoints, including LI4 (He Gu), LI11(Qu Chi), ST25 (Tian Shu), ST36 (Zu San Li), SP6 (San Yin Jiao), KI3 (Tai Xi), LR3 (Tai Chong). The acupoints in the limbs and trunk area, were applied bilaterally. Power of laser device is 50%.

Oral vitamin B1.

LA group used a class IV Multiwave Locked System (MLS) laser (Mphi laser, ASA Srl, Vicenza, Italy). MLS laser is a class IV NIR laser with two synchronized sources (905 nm with 75 W peak power, pulsed mode; 808 nm with power 1 W, continuous mode). Both laser beams were synchronized, the locked waves work with the range 1-2000 Hz.

In LA group, based on clinical experience, we choose 5 acupoints on the affected side. It includes ST2(Si Bai), ST4(Di Cang), ST6(Jia Che), GB14(Yang Bai), GB20(Feng chi). We choose 7 acupoints, including LI4 (He Gu), LI11(Qu Chi), ST25 (Tian Shu), ST36 (Zu San Li), SP6 (San Yin Jiao), KI3 (Tai Xi), LR3 (Tai Chong). The acupoints in the limbs and trunk area, were applied bilaterally. Power of laser device is 25%.

Oral vitamin B1.

Treatments were performed with MLS laser (Mphi laser, ASA Srl, Italy). MLS laser is a class IV NIR laser with two synchronized sources (laser diodes). The first one is a pulsed laser diode, emitting at 905 nm, with 25 W peak power. The second laser diode (808 nm) was operated in a continuous mode with power 1 W. Both of the laser beams were synchronized, the locked waves work within the range 1-2000 Hz.

The House-Brackmann facial nerve grading system (HB grading) is based on a 6-grade score that offers a gross evaluation of facial motor function and includes the evaluation of sequelae. The prognoses of patients with House-Brackmann grade I or grade II were considered good, and the prognoses of those with grade 3 or higher were considered poor.

The Sunnybrook facial grading system (SB grading) is 13-items, self-reported questionnaire that used to evaluate the facial movement of patients. Among the overall 13 items of question, 3 items are resting symmetry, 5 items are symmetry of voluntary movement, and 5 items are synkinesis. Lower scores of Sunnybrook equate to greater severity of facial paralysis symptoms.

The goal of the Electroneurography (ENoG) testing is to measure the amount of neural degradation that has occurred distal to the site of facial nerve injury by measuring the muscle response to an electrical stimulus. The testing of ENoG involves recording the compound muscle action potential (CAMP) of the mimetic muscles, including Orbicularis oculi, Frontalis muscle, Orbicularis oris and Zygomaticus muscle.

ENoG is performed first on the healthy side of the face and then on the affected side. Nerve damage or nerve fiber degeneration leads to a decrease or loss of the CAMP. The amplitude of the CAMP on the affected side is compared to the CAMP of the healthy side and expressed as percent (amplitude of the paralyzed side divided by the amplitude of the normal side). A side difference of 30% or bigger is considered pathologic.