The role of surface electromyography in confirming the effect of blepharoplasty on strength of levator palpebrae superioris muscle in congenital blepharoptosis

Egyptian Rheumatology and Rehabilitation

Table 4 The electrophysiological and clinical improvement of cases post-blepharoplasty in relation to pre-operative SEMG parameters

Pre-operative SEMG	Clinical improvement		Student t test (p-value)	Electrophysiological improvement		Student t test (p-value)
Pre-operative SEMG	Improved (N = 36)	Not-improved (N = 4)	Student t test (p-value)	Improved (N = 33)	Not-improved (N = 7)	Student t test (p-value)
Amplitude (uV)	253.7 ± 51.7 188–339	162.5 ± 15.3 150–180	7.65 (< 0.001)**	259.2 ± 50.0 200–339	173.7 ± 17.6 150–190	3.31 (0.002)*
Firing frequency (Hz)	29.3 ± 2.2 27–33	34.5 ± 0.6 34–35	3.43 (0.001)*	29.7 ± 1.4 27–32	33.9 ± 0.9 33–35	4.27 (< 0.001)**