title: Surface electromyography analysis of blepharoptosis correction by transconjunctival incisions.
abstract: Upper eyelid movement depends on the antagonistic actions of orbicularis oculi muscle and levator aponeurosis. Blepharoptosis is an abnormal drooping of upper eyelid margin with the eye in primary position of gaze. Transconjunctival incisions for upper eyelid ptosis correction have been a well-developed technique. Conventional prognosis however depends on clinical observations and lacks of quantitatively analysis for the eyelid muscle controlling. This study examines the possibility of using the assessments of temporal correlation in surface electromyography (SEMG) as a quantitative description for the change of muscle controlling after operation. Eyelid SEMG was measured from patients with blepharoptosis preoperatively and postoperatively, as well as, for comparative study, from young and aged normal subjects. The data were analyzed using the detrended fluctuation analysis method. The results show that the temporal correlation of the SEMG signals can be characterized by two indices associated with the correlation properties in short and long time scales demarcated at 3ms, corresponding to the time scale of neural response. Aging causes degradation of the correlation properties at both time scales, and patient group likely possess more serious correlation degradation in long-time regime which was improved moderately by the ptosis corrections. We propose that the temporal correlation in SEMG signals may be regarded as an indicator for evaluating the performance of eyelid muscle controlling in postoperative recovery.
authors.affiliation: Department of Biology Science and Technology, National Chiao Tung University, Hsinchu, Taiwan; Department of Plastic Surgery, Mackay Memorial Hospital, Taipei, Taiwan.
authors.forename: Lung-Chen
authors.initials: LC
authors.lastname: Tu
authors.affiliation: Research Center for Adaptive Data Analysis, National Central University, Chungli, Taiwan; Institute of Physics, Academia Sinica, Taipei, Taiwan. Electronic address: mcwu@ncu.edu.tw.
authors.forename: Ming-Chya
authors.initials: MC
authors.lastname: Wu
authors.affiliation: Department of Biology Science and Technology, National Chiao Tung University, Hsinchu, Taiwan.
authors.forename: Hsueh-Liang
authors.initials: HL
authors.lastname: Chu
authors.affiliation: Department of Rehabilitation, Mackay Memorial Hospital, Taipei, Taiwan.
authors.forename: Yi-Pin
authors.initials: YP
authors.lastname: Chiang
authors.affiliation: Department of Rehabilitation, Mackay Memorial Hospital, Taipei, Taiwan.
authors.forename: Chih-Lin
authors.initials: CL
authors.lastname: Kuo
authors.affiliation: Department of Biology Science and Technology, National Chiao Tung University, Hsinchu, Taiwan; Department of Pediatrics, Taipei Veterans General Hospital, Taoyuan Branch, Taoyuan, Taiwan.
authors.forename: Hsing-Yuan
authors.initials: HY
authors.lastname: Li
authors.affiliation: Department of Biology Science and Technology, National Chiao Tung University, Hsinchu, Taiwan; Institute of Physics, Academia Sinica, Taipei, Taiwan. Electronic address: ccchang01@faculty.nctu.edu.tw.
authors.forename: Chia-Ching
authors.initials: CC
authors.lastname: Chang
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D019882:Blepharoplasty / Q000379:methods; D001763:Blepharoptosis / Q000175:diagnosis* / Q000503:physiopathology / Q000601:surgery*; D003228:Conjunctiva / Q000502:physiology / Q000601:surgery*; D004576:Electromyography / Q000379:methods*; D005143:Eyelids / Q000502:physiology; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009801:Oculomotor Muscles / Q000502:physiology; D011182:Postoperative Care / Q000379:methods*; D012189:Retrospective Studies; D016896:Treatment Outcome
keywords: Blepharoptosis; Detrended fluctuation analysis; Surface electromyography; Transconjunctival incision