scholarly journals Anterior Cervical Discectomy and Fusion Using Zero-P System for Treatment of Cervical Spondylosis: A Meta-Analysis

2021 ◽  
Vol 2021 ◽  
pp. 1-15
Author(s):  
Zhaoyang Guo ◽  
Xiaolin Wu ◽  
Shuai Yang ◽  
Chang Liu ◽  
Youfu Zhu ◽  
...  
Keyword(s):  
Meta Analysis ◽  
Fusion Rate ◽  
Cochrane Library ◽  
P System ◽  
Screw Loosening ◽  
Postoperative Dysphagia ◽  
Anterior Plate ◽  
Intervertebral Fusion ◽  
Sinking Rate ◽  
Cage System

Objective. The current study aimed to explore the efficacy of Zero profile intervertebral fusion system (Zero-P) and traditional anterior plate cage system (PC) in the treatment of cervical spondylotic myelopathy (CSM). Further, the present study evaluated effects of the treatments on medical security, height of intervertebral disc, adjacent-level ossification development (ALOD), and adjacent segmentation disease (ASD) through a systematic retrospective analysis. Methods. Studies on Zero-P system and traditional anterior plate cage system for ACDF in the treatment of CSM were searched in PubMed, Web of Science, Ovid, Embase, and Cochrane Library databases. Two independent researchers screened articles, extracted data, and evaluated the quality of the articles based on the inclusion and exclusion criteria of the current study. RevMan5.3 software was used for meta-analysis following the guidelines of Cochrane collaboration network. Cervical curvature, interbody fusion rate, preoperative and postoperative disc height index (DHI), fusion cage sinking rate, postoperative dysphagia, ASD, ALOD, and loosening of screw were compared between the two groups. Results. A total of 17 literatures were included in the present study, including 6 randomized controlled trials and 11 observational studies. The studies comprised a total of 1204 patients with CSM, including 605 patients in the Zero-P system group (Zero-P group) and 599 patients in the traditional animal plate cage group (PC group). Results of this meta-analysis showed that postoperative dysphagia [OR = 0.40, CI (0.28, 95% 0.58), P  < 0.00001], ALOD [OR = 0.09, CI (0.02, 95% 0.39), P  = 0.001], ASD [OR = 0.42, CI (0.20, 95% 0.86), P  = 0.02], and screw loosening [OR = 0.20, CI (0.08, 95% 0.52), P  = 0.0009] of the Zero-P group were significantly lower compared with the PC group. On the other hand, preoperative cervical curvature [WMD = −0.23, CI (−1.38, 95% 0.92), P  = 0.69], postoperative cervical curvature [WMD = −0.38, CI (−1.77, 95% 1.01), P  = 0.59], cage sinking rate [OR = 1.41, CI [0.52, 95% 3.82], P  = 0.50], intervertebral fusion rate [OR = 0.76, CI (0.27, 95% 2.48), P  = 0.38], preoperative DHI [WMD = −0.04, CI (−0.14, 95% 0.22), P  = 0.65], and postoperative DHI [WMD = 0.06, CI (−0.22, 95% 0.34), P  = 0.675] were not significantly different between the two groups. Conclusion. It was evident that the Zero-P system used in ACDF is superior compared with the traditional anterior plate cage system in postoperative dysphagia, avoiding ALOD, ASD, and screw loosening.

scholarly journals A comparison of the bridge-type ROI-C interbody fusion cage system and ACDF with plating and cage system in 2-level anterior cervical discectomy and fusion: A retrospective study

2021 ◽  
Author(s):  
Shuangjun He ◽  
Zhangzhe Zhou ◽  
Xiaofeng Shao ◽  
Changhao Zhang ◽  
Xinfeng Zhou ◽  
...  
Keyword(s):  
Interbody Fusion ◽  
Operation Time ◽  
Fusion Rate ◽  
Postoperative Dysphagia ◽  
Cage System ◽  
Group A ◽  
Bridge Type ◽  
Group B ◽  
Fusion Cage

Abstract Objective: A study was conducted to explore the clinical efficacy and radioactive results of the bridge-type ROI-C interbody fusion cage (ROI-C) and anterior cervical discectomy and fusion with plating and cage system (ACDF) for cervical spondylopathy.Methods: From January 2014 to January 2018, 45 patients who underwent operations were retrospectively analyzed, including 24 cases of ROI-C (group A) and 21 cases of ACDF (group B). The operation time, blood loss, Neck Disability Index (NDI), Japanese Orthopaedic Association score (JOA), postoperative complications, imaging results including cervical Cobb angle, and fusion were compared between groups.Results: All patients were successfully treated with surgery. No cerebrospinal fluid leakage, esophageal fistula, or hoarseness occurred after the surgery. The operation time and blood loss in group A were lower than those in group B (P<0.05). During the follow-up period, JOA score increased and NDI score decreased after the operation (P<0.05), but no significant difference was found between the groups (P>0.05). In group A, the incidence of postoperative dysphagia was 12.5%, which returned to normal after 1 month. In group B, the incidence of postoperative dysphagia was 38.1%, which was 19% after 1 month and 4.8% at the final follow-up. In group A, the fusion rate was 83.3% at 3 months after surgery and 100% at the last follow-up. The rate of adjacent level ossification development was 12.5%. In group B, the fusion rate was 85.7% at 3 months after surgery and 100% at the last follow-up. The rate of adjacent level ossification development was 23.8%.Conclusion: Both ROI-C and ACDF achieved satisfactory results, but ROI-C had a shorter operation time, less bleeding, and lower incidence of dysphagia in the short term.

scholarly journals Is laminoplasty or laminectomy the best strategy for C3 segment in French-door laminoplasty? A systematic review and meta-analysis

2021 ◽  
Vol 16 (1) ◽  
Author(s):  
Tiantian Chen ◽  
Xun Zhang ◽  
Fanchao Meng ◽  
Jinglong Yan ◽  
Gongping Xu ◽  
...  
Keyword(s):  
Clinical Outcomes ◽  
Recovery Rate ◽  
Operative Time ◽  
Meta Analysis ◽  
Japanese Orthopaedic Association ◽  
Fusion Rate ◽  
Cochrane Library ◽  
Bony Fusion ◽  
Registration Number ◽  
Multilevel Cervical Spondylotic Myelopathy

Abstract Background To compare the clinical outcomes of C3 laminectomy and C3 laminoplasty at the C3 segment during French-door laminoplasty. Methods The Cochrane Library, PubMed, Embase, and Web of Science databases were searched from inception to November 10, 2020 for studies comparing the clinical outcomes of two types of French-door laminoplasty in the treatment of multilevel cervical spondylotic myelopathy (MCSM). Review Manager 5.3 was used to analyze the following outcomes: operative time, intraoperative blood loss, preoperative and postoperative Japanese Orthopaedic Association (JOA) scores, recovery rate, cervical curvature, cervical range of motion (ROM), incidence of axial symptoms (AS), and C2-3 bony fusion rate. Results A total of eight studies involving 776 patients were included; there were 424 patients in the C3 laminectomy group and 352 patients in the C3 laminoplasty group. The results of the meta-analysis showed that the C3 laminectomy group was superior to the C3 laminoplasty group in terms of operative time (P < 0.00001), cervical ROM (P = 0.04), and incidence of AS (P < 0.0001). However, no statistically significant differences between the two groups were noted regarding intraoperative bleeding (P = 0.44), preoperative JOA score (P = 0.57), postoperative JOA score (P = 0.09), recovery rate (P = 0.25), cervical curvature (P = 0.22), and C2-3 bony fusion rate (P = 0.06). Conclusion This meta-analysis demonstrated that both C3 laminoplasty and C3 laminectomy could effectively improve neurological function in patients with MCSM in French-door laminoplasty. However, C3 laminectomy can reduce the operative time, preserve cervical ROM, and reduce the incidence of postoperative AS. Trial registration PROSPERO registration number is CRD42021230798. Date of registration: February 11, 2021.

scholarly journals Ankle arthrodesis-Open versus arthroscopic in the Treatment of Ankle Arthritis: A meta-analysis

2019 ◽  
Author(s):  
Tsz Ngai Mok ◽  
Qiyu He ◽  
Soundarya Panneerselvam ◽  
Huige Hou ◽  
Huajun Wang ◽  
...  
Keyword(s):  
Blood Loss ◽  
Open Surgery ◽  
Meta Analysis ◽  
Fusion Rate ◽  
Functional Improvement ◽  
Cochrane Library ◽  
Ankle Arthritis ◽  
Tourniquet Time ◽  
Pooled Data ◽  
Estimated Blood Loss

Abstract Background: This study intends in evaluating the comparsion between arthroscopic arthrodesis and open surgery for patients with ankle arthritis by performing a meta-analysis. Methods: A literature search for this meta-analysis was conducted using four English databases (Pubmed, Embase, Medline and the Cochrane Library), up to August 2019. These included two prospective cohort study and 7 retrospective cohort studies, enrolling a total of 507 patients with ankle arthritis. Result: For fusion rate, the pooled data showed significantly higher rate of fusion during the arthroscopic arthrodesis compared with open surgery (odds ratio 0.25, 95% CI 0.11 to 0.57, p = 0.0010). Regarding to the estimated blood loss, the pooled data showed significantly smaller blood losses during arthroscopic arthrodesis as compared with open surgery (WMD 52.04, 95% CI 14.14 to 89.94, p = 0.007). For tourniquet time, the pooled data showed smaller tourniquet time during arthroscopic arthrodesis compared with open surgery (WMD 22.68, 95% CI 1.92 to 43.43, p = 0.03). In the length of stay in the hospital, the pooled data showed less time of hospitalization for patients undergoing arthroscopic arthrodesis compared with open surgery (WMD 1.62, 95% CI 0.97 to 2.26, p < 0.00001). The pooled data showed better recovery for the patients who experienced arthroscopic arthrodesis as compared with open surgery at 1 year (WMD 14.73, 95% CI 6.66 to 22.80, p = 0.0003). Conclusion: For patients with ankle arthritis, arthroscopic arthrodesis seems to be associated with a higher fusion rate, lesser amount of estimated blood loss, shorter tourniquet time, shorter length of hospitalization and better functional improvement at 1 year.

scholarly journals Does zero-profile anchored cage accompanied by a higher postoperative subsidence compared with cage-plate construct? A meta-analysis

2019 ◽  
Author(s):  
Yingjie Lu ◽  
Yuepeng Fang ◽  
Xu Shen ◽  
Dongdong Lu ◽  
Liyu Zhou ◽  
...  
Keyword(s):  
Clinical Symptoms ◽  
Meta Analysis ◽  
Operation Time ◽  
Fusion Rate ◽  
Anterior Plate ◽  
Subsidence Rate ◽  
Significant Difference ◽  
Multi Level ◽  
Final Followup ◽  
Definition Of

Abstract Background Zero-profile anchored cage (ZP) has been widely used for its lower occurrence of dysphagia. However, it is still controversial whether it has the same stability as the cage-plate construct (CP) and increases the incidence of postoperative subsidence. We compared the rate of subsidence after anterior cervical discectomy and fusion (ACDF) with ZP and CP to determine whether the zero-profile device had a higher subsidence rate?Methods We performed a meta-analysis of studies which compared the subsidence rate of ZP and CP. An extensive and systematical search covered Medline, Embase and Web of Science databases according to PRISMA guidelines and identified ten articles that satisfied our inclusion criteria. Relevant clinical and radiological data were extracted and analysed by RevMan 5.3 software.Results Ten trials involving 626 patients were included in this meta-analysis. The incidence of postoperative subsidence in ZP group was significantly higher than with CP group [15.1% (89/588) vs. 8.8% (51/581), OR = 1.97 (1.34, 2.89), P = 0.0005]. In subgroup analysis, we found that the definition of subsidence did not affect the higher subsidence rate in the ZP group. Considering the quantity of operative segments, there was no significant difference in the incidence of subsidence between the two groups after single-level fusion (OR 1.43, 95% CI 0.61-3.37, P = 0.41). However, the subsidence rate of the ZP group was significantly higher than the CP group (OR 2.61, 95% CI 1.55-4.40, P = 0.0003) after multi-level surgery. There were no significant differences in intraoperative blood loss, JOA score, NDI score, fusion rate and cervical aligment in the final followup between the two groups. In addition, the CP group had a longer operation time and a higher incidence of dysphagia at each follow-up time than the ZP group.Conclusion ZP had a higher risk of postoperative subsidence than CP. Although there was a high occurrence of swallowing discomfort, we are more agreed that the anterior plate should be used in multi-level surgery as far as possible to reduce the subsidence and adverse clinical symptoms in the long term.

Does non-institutionalized elders have a better oral health status compared to institutionalized ones? A systematic review and meta-analysis

2020 ◽  
Vol 25 (6) ◽  
pp. 2177-2192 ◽  
Author(s):  
Ilky Pollansky Silva e Farias ◽  
Simone Alves de Sousa ◽  
Leopoldina de Fátima Dantas de Almeida ◽  
Bianca Marques Santiago ◽  
Antonio Carlos Pereira ◽  
...  
Keyword(s):  
Systematic Review ◽  
Health Status ◽  
Oral Health ◽  
Dental Caries ◽  
Meta Analysis ◽  
Oral Health Status ◽  
Cochrane Library ◽  
Caries Experience ◽  
Institutionalized Elderly ◽  
Periodontal Status

Abstract This systematic review compared the oral health status between institutionalized and non-institutionalized elders. The following electronic databases were searched: PubMed (Medline), Scopus, Web of Science, Lilacs and Cochrane Library, in a comprehensive and unrestricted manner. Electronic searches retrieved 1687 articles, which were analyzed with regards to respective eligibility criteria. After reading titles and abstracts, five studies were included and analyzed with respect their methodological quality. Oral status of institutionalized and non-institutionalized elderly was compared through meta-analysis. Included articles involved a cross-sectional design, which investigated 1936 individuals aged 60 years and over, being 999 Institutionalized and 937 non-institutionalized elders. Studies have investigated the prevalence of edentulous individuals, the dental caries experience and the periodontal status. Meta-analysis revealed that institutionalized elderly have greater prevalence of edentulous (OR = 2.28, 95%CI = 1.68-3.07) and higher number of decayed teeth (MD = 0.88, 95%CI = 0.71-1.05) and missed teeth (MD = 4.58, 95%CI = 1.89-7.27). Poor periodontal status did not differ significantly between groups. Compared to non-institutionalized, institutionalized elders have worse dental caries experience.

Laser Influence on Dental Sensitivity Compared to Other Light Sources Used During In-office Dental Bleaching: Systematic Review and Meta-analysis

2020 ◽  
Vol 45 (6) ◽  
pp. 589-597
Author(s):  
BGS Casado ◽  
EP Pellizzer ◽  
JR Souto Maior ◽  
CAA Lemos ◽  
BCE Vasconcelos ◽  
...  
Keyword(s):  
Randomized Clinical Trials ◽  
Color Change ◽  
Meta Analysis ◽  
Present Review ◽  
Cochrane Library ◽  
Light Sources ◽  
Eligibility Criteria ◽  
Tooth Color ◽  
Significant Difference ◽  
Meta Analyses

Clinical Relevance The use of laser light during bleaching will not reduce the incidence or severity of sensitivity and will not increase the degree of color change compared with nonlaser light sources. SUMMARY Objective: To evaluate whether the use of laser during in-office bleaching promotes a reduction in dental sensitivity after bleaching compared with other light sources. Methods: The present review was conducted following the Preferred Reporting Items for Systematic Reviews and Meta-analyses (PRISMA) and is registered with PROSPERO (CDR42018096591). Searches were conducted in the PubMed/Medline, Web of Science, and Cochrane Library databases for relevant articles published up to August 2018. Only randomized clinical trials among adults that compared the use of laser during in-office whitening and other light sources were considered eligible. Results: After analysis of the texts retrieved during the database search, six articles met the eligibility criteria and were selected for the present review. For the outcome dental sensitivity, no significant difference was found favoring any type of light either for intensity (mean difference [MD]: −1.60; confidence interval [CI]: −3.42 to 0.22; p=0.09) or incidence (MD: 1.00; CI: 0.755 to 1.33; p=1.00). Regarding change in tooth color, no significant differences were found between the use of the laser and other light sources (MD: −2.22; CI: −6.36 to 1.93; p=0.29). Conclusions: Within the limitations of the present study, laser exerts no influence on tooth sensitivity compared with other light sources when used during in-office bleaching. The included studies demonstrated that laser use during in-office bleaching may have no influence on tooth color change.

Indicated preventive interventions for anxiety in children and adolescents: a review and meta-analysis of school based programs

2019 ◽  
Author(s):  
Siobhan Hugh-Jones ◽  
Sophie Beckett ◽  
Pavan Mallikarjun
Keyword(s):  
Meta Analysis ◽  
Child And Adolescent ◽  
Sensitivity Analyses ◽  
Cochrane Library ◽  
Control Groups ◽  
Adolescent Anxiety ◽  
School Based ◽  
Intervention Intensity ◽  
Randomised Controlled ◽  
And Control

Schools are promising sites for the delivery of prevention and early intervention programs to reduce child and adolescent anxiety. It is unclear whether universal or targeted approaches are most effective. This review and meta-analysis examines the effectiveness of school-based indicated interventions and was registered with PROSPERO [CRD42018087628].MEDLINE, EMBASE, PsycINFO and the Cochrane Library were searched for randomised controlled trials comparing indicated school programs for child and adolescent anxiety to active or inactive control groups. Twenty original studies, with 2076 participants, met the inclusion criteria and 18 were suitable for meta-analysis. Sub-group and sensitivity analyses explored intervention intensity, delivery agent and control type. A small beneficial effect was found for indicated programs compared to controls on self-reported anxiety symptoms at post-test (g = -0.28, CI = -0.50, -0.05, k= 18). The small effect was maintained at 6 (g = -0.35, CI= -0.58, -0.13, k = 9) and 12 months (g = -0.24, CI = -0.48, 0.00, k = 4). Based on two studies, &gt;12 month effects were very small (g = -0.01, CI= -0.38, 0.36). No differences were found based on intervention intensity, delivery agent and control type. There was evidence of publication bias and a relatively high risk of contamination in studies. Findings support the value of school based indicated programs for child and adolescent anxiety. Effects at 12 months outperform many universal programs. High quality, randomised controlled and pragmatic trials are needed, with attention control groups and beyond 12 month diagnostic assessments are needed.

Comparative Efficacy and Safety of Duration of Dual Antiplatelet Therapy in Patients with CAD Undergoing Drug-eluting Stent Implantation: A Systematic Review and Network Meta-analysis

2020 ◽  
Vol 26 (44) ◽  
pp. 5739-5745
Author(s):  
Jieqiong Guan ◽  
Wenjing Song ◽  
Pan He ◽  
Siyu Fan ◽  
Hong Zhi ◽  
...  
Keyword(s):  
Antiplatelet Therapy ◽  
Major Bleeding ◽  
Dual Antiplatelet Therapy ◽  
Meta Analysis ◽  
Cochrane Library ◽  
Drug Eluting Stent ◽  
Efficacy And Safety ◽  
Risk Of Bleeding ◽  
Increased Risk ◽  
Drug Eluting

Objective: The aim was to evaluate the efficacy and safety of duration of dual antiplatelet therapy (DAPT) for patients who received percutaneous coronary intervention (PCI) with a drug-eluting stent. Background: The optimal duration of DAPT to balance the risk of ischemia and bleeding in CAD patients undergoing drug-eluting stent (DES) implantation remains controversial. Methods: PubMed, Cochrane Library, Web of Science, Clinicaltrials.gov, CNKI and Wanfang Databases were searched for randomized controlled trials of comparing different durations of DAPT after DES implantation. Primary outcomes were major adverse cardiac and cerebrovascular events (MACCE), and major bleeding, and were pooled by Bayes network meta-analysis. Net adverse clinical and cerebral events were used to estimate the surface under the cumulative ranking (SUCRA) curves. The subgroup analysis based on clinical status, follow-up and area was conducted using traditional pairwise meta-analysis. Results: A total of nineteen trials (n=51,035) were included, involving six duration strategies. The network metaanalysis showed that T2 (<6-month DAPT followed by aspirin, HR:1.51, 95%CI:1.02-2.22), T3 (standard 6-month DAPT, HR:1.47, 95%CI:1.14-1.91), T4 (standard 12-month DAPT, HR:1.41, 95%CI:1.15-1.75) and T5 (18-24 months DAPT, HR:1.47, 95%CI:1.09-1.97) was associated with significantly increased risk of MACCE compared to T6 (>24-month DAPT). However, no significant difference was found in MACCE risk between T1 (<6-month DAPT followed by P2Y12 monotherapy) and T6. Moreover, T5 was associated with significantly increased risk of bleeding compared to T1(RR:3.94, 95%CI:1.66-10.60), T2(RR:3.65, 95%CI:1.32-9.97), T3(RR:1.93, 95%CI:1.21-3.50) and T4(RR:1.89, 95%CI:1.15-3.30). The cumulative probabilities showed that T6(85.0%), T1(78.3%) and T4(44.5%) were the most efficacious treatment compared to the other durations. In the ACS (<50%) subgroup, T1 was observed to significantly reduce the risk of major bleeding compared to T4, but not in the ACS (≥50%) subgroup. Conclusions: Compared with other durations, short DAPT followed by P2Y12 inhibitor monotherapy showed non-inferiority, with a lower risk of bleeding and not associated with an increased MACCE. In addition, the risk of major bleeding increased significantly, starting with DAPT for 18-month. Compared with the short-term treatment, patients with ACS with the standard 12-month treatment have a better prognosis, including lower bleeding rate and the decreased risk of MACCE. Due to study's limitations, the results should be verified in different risk populations.

Effect of antihypertensive drugs on cognition and behavioral symptoms of patients with Alzheimer’s disease: A meta-analysis

2020 ◽  
Vol 21 ◽  
Author(s):  
Roja Rahimi ◽  
Shekoufeh Nikfar ◽  
Masoud Sadeghi ◽  
Mohammad Abdollahi ◽  
Reza Heidary Moghaddam ◽  
...  
Keyword(s):  
Alzheimer’S Disease ◽  
Alzheimer's Disease ◽  
Randomized Clinical Trials ◽  
Antihypertensive Drugs ◽  
Meta Analysis ◽  
Behavioral Symptoms ◽  
Cochrane Library ◽  
Mean Differences ◽  
Global Impression Of Change ◽  
State Examination

Background: It has been found that there is a link between hypertension and elevated risk of Alzheimer’s disease (AD). Herein, a meta-analysis based on randomized clinical trials (RCTs) was used to assess the effect of antihypertensive drugs on cognition and behavioral symptoms of AD patients. Method: The three databases – PubMed/Medline, Scopus, and Cochrane Library- were searched up to March 2020. The quality of the studies included in the meta-analysis was evaluated by the Jadad score. Clinical Global Impression of Change (CGIC) included in two studies, Mini-Mental State Examination (MMSE) included in three studies, and Neuropsychiatric Inventory (NPI) in three studies were the main outcomes in this systematic review. Results: Out of 1506 studies retrieved in the databases, 5 RCTs included and analyzed in the meta-analysis. The pooled mean differences of CGIC, MMSE, and NPI in patients with AD receiving antihypertensive drugs compared to placebo was -1.76 with (95% CI = -2.66 to -0.86; P=0.0001), 0.74 (95% CI = 0.20 to 1.28; P= 0.007), and -9.49 (95% CI = -19.76 to 0.79; P = 0.07), respectively. Conclusion: The findings of the present meta-analysis show that antihypertensive drugs may improve cognition and behavioral symptoms of patients with AD. However, more well-designed RCTs with similar drugs are needed to achieve more conclusive results.

Characteristics of Insulin-degrading Enzyme in Alzheimer's Disease: A Meta-Analysis

2018 ◽  
Vol 15 (7) ◽  
pp. 610-617 ◽  
Author(s):  
Huifeng Zhang ◽  
Dan Liu ◽  
Huanhuan Huang ◽  
Yujia Zhao ◽  
Hui Zhou
Keyword(s):  
Alzheimer’S Disease ◽  
Alzheimer's Disease ◽  
Enzyme Activity ◽  
Protein Level ◽  
Senile Plaque ◽  
Meta Analysis ◽  
Cochrane Library ◽  
Insulin Degrading Enzyme ◽  
Degrading Enzyme ◽  
Significant Difference

Background: β-amyloid (Aβ) accumulates abnormally to senile plaque which is the initiator of Alzheimer's disease (AD). As one of the Aβ-degrading enzymes, Insulin-degrading enzyme (IDE) remains controversial for its protein level and activity in Alzheimer's brain. Methods: The electronic databases PubMed, EMBASE, The Cochrane Library, OVID and Sinomed were systemically searched up to Sep. 20th, 2017. And the published case-control or cohort studies were retrieved to perform the meta-analysis. Results: Seven studies for IDE protein level (AD cases = 293; controls = 126), three for mRNA level (AD cases = 138; controls = 81), and three for enzyme activity (AD cases = 123; controls = 75) were pooling together. The IDE protein level was significantly lower in AD cases than in controls (SMD = - 0.47, 95% CI [-0.69, -0.24], p < 0.001), but IDE mRNA and enzyme activity had no significant difference (SMD = 0.02, 95% CI [-0.40, 0.43] and SMD = 0.06, 95% CI [-0.41, 0.53] respectively). Subgroup analyses found that IDE protein level was decreased in both cortex and hippocampus of AD cases (SMD = -0.43, 95% CI [-0.71, -0.16], p = 0.002 and SMD = -0.53, 95% CI [-0.91, -0.15], p = 0.006 respectively). However, IDE mRNA was higher in cortex of AD cases (SMD = 0.71, 95% CI [0.14, 1.29], p = 0.01), not in hippocampus (SMD = -0.26, 95% CI [-0.58, 0.06]). Conclusions: Our results indicate that AD patients may have lower IDE protease level. Further relevant studies are still needed to verify whether IDE is one of the factors affecting Aβ abnormal accumulation and throw new insights for AD detection or therapy.

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