ABSTRACT
Objective To evaluate the clinical efficacy and safety of different full spectrum light times in treating patients with Alzheimer's disease (AD).Methods A total of 127 AD patients with sleep disorder were randomly divided into a blank group (n=34),a 30 min group (n=31),a 60 min group (n=33) and a 120 min group (n=29).After one month treatment by 10 000 lux full spectrum fluorescent light,the improvements of sleep quality,excessive daytime sleepiness,cognitive ability,mental state,dementia degree were graded by Pittsburgh sleep quality index (PQSI),Epworth sleepiness scale (ESS),Neuropsychiatric inventory (NPI),mini-mental state examination (MMSE),global deterioration scale (GDS).The scores were compared among the groups before the treatment and after the treatment respectively.Results (1) Compared with before treatment,the scores of PQSI,ESS,NPI of the 30 min group,60min group and 120min group were statistically significant (in 30 min group 14.4 ±5.2vs 11.7±4.9,14.4±4.1 vs 11.8±3.7,14.2±1.3 vs 10.9±1.7,t=2.071,2.609,8.446.P=0.043,0.011,0.000; in 60 min group13.4±4.0 vs 8.1±3.7,14.5±3.0 vs 9.4±2.0,13.7±5.8 vs 8.7±4.3,t=5.650,8.209,3.902,all P＜0.01 ;in 120 min group 14.0±3.2 vs 7.0±2.3,14.7-±2.3 vs 7.0± 1.9,14.9±3.6 vs 8.1±3.7,t=9.474,13.926,7.062,all P＜0.01),but the scores of MMSE,GDS were not statistical significances(all P＞0.05).(2)Compared with the blank group,the scores of PQSI,ESS,NPI of 30 min group,60 min group and 120 min group were statistically significant (30 min group t=1.936,4.524,2.482,P=0.031,0.000,0.016.60 min group t=5.945,5.153,7.319,all P=0.000.120 min group t=7.896,6.767,10.776,all P=0.000), but the scores of MMSE,GDS were not statistical significances(all P＞0.05).(3)Compared with the 30 min group,the scores of PQSI,ESS,NPI of 60 min group and 120 min group were statistically significances (60 min group t =3.288,2.694,3.354,P=0.002,0.009,0.001.120 min group t=4.615,3.930,6.303,all P =0.000),the scores of MMSE,GDS were not statistical significances (all P＞0.05).Compared with the 60 min group,the scores of ESS of 120 min group was statistically significant(t=4.854,P=0.000),but the scores of PQSI,NPI,MMSE,GDS were not statistical significances (all P ＞ 0.05).Conclusion It is demonstrated good curative effects that light therapy treat patients on AD patients in the matter of sleep quality,excessive daytime sleepiness,mental state,but have not apparent effect for their cognitive ability and dementia degree.And the effect of light therapy with 60 or 120 minutes is better than that of 30 minute,illumination time of 120 minutes is superior to that of 60 minutes in improving excessive daytime sleepiness.Light therapy has no obvious impacts in the cognitive ability and the degree of dementia in the patients with AD and has not appear obvious adverse reaction in the process of treatment.