Correlation study of brain function changes after chemotherapy in breast cancer patients by automated fiber quantification based on diffusion tensor imaging

by Yun Feng, Wei Chen, Yang Lu, Haifei Zhou

Purpose

The aim of this study is to evaluate the changes of white matter microstructure in breast cancer patients before and after chemotherapy based on automated fiber quantification (AFQ),as well as determine if these dispersion indexes are significantly correlated with clinical data.

Materials and Methods

Twenty-four breast cancer patients scheduled for chemotherapy were enrolled. Diffusion tensor imaging (DTI), neuropsychological tests and self-report measures, and hematological tests were conducted before chemotherapy(time 0,T0) and within one week after chemotherapy(time 1,T1). AFQ was used to track 20 fiber tracts in the brain. The correlation between average abnormal tracts and changes in neuropsychological tests and self-report measures and blood indicators was analyzed.

Results

Compared to T0, subjects at T1 showed decreased scores on the verbal fluency test; increased scores on the self-rating anxiety scale(SAS)and self-rating depression scale (SDS). Estrogen concentration was lower while luteinizing hormone(LH), follicle-stimulating hormone, and triglyceride levels were higher. Mean fractional anisotropy (FA) value decreased in the right cingulum cingulate(CGC)while mean radial diffusivity (RD) increased in the right CGC; mean axial diffusivity (AD) value decreased in callosum forceps major and callosum forceps minor. Changes in FA with in the right CGC were positively correlated with changes in SDS and LH, while changes in RD with in the right CGC were negatively correlated with changes in SDS and LH.

Conclusion

Early changes observed in brain white matter fiber tracts, along with persistent hormone and triglyceride metabolism disorders, could potentially serve as neurobiological markers for monitoring chemotherapy-induced cognitive impairment.

Evaluating the Clinical Effectiveness of Nurse‐Led Rehabilitation for Stroke Survivors: A Systematic Review and Meta‐Analysis

ABSTRACT

Aim

To systematically compare nurse-led versus traditional rehabilitation in improving clinical outcomes for stroke survivors.

Design

Systematic review and meta-analysis.

Methods

Data were extracted from Cochrane, PubMed, Embase, and Web of Science (searched up to July 2024). Analyses with standardized mean differences (SMDs) and risk ratios (RRs) as the estimates were performed in Review Manager 5.4 and Stata 15.0. Randomized controlled trials investigating nurse-led stroke rehabilitation with outcomes such as mental component summary (MCS) and physical component summary (PCS) of quality of life, self-efficacy, National Institutes of Health Stroke Scale (NIHSS), stroke-specific quality of life (SS-QOL), Barthel Index (BI), Geriatric Depression Scale-15 (GDS-15), and pain were included. Sensitivity analyses and Grading of Recommendations Assessment, Development and Evaluation (GRADE) were performed.

Results

A total of 12 articles were included. The quality assessment indicated that most studies did not have a serious risk of bias. Nurse-led rehabilitation showed significant improvements in SS-QOL (SMD: 3.33, 95% CI: 1.26, 5.40; very low-quality evidence), depressive symptoms (GDS-15, SMD: −2.21; 95% CI: −2.80, −1.63; high-quality evidence), pain (SMD: −1.61; 95% CI: −2.14, −1.08; high-quality evidence), and BI (SMD: 0.24, 95% CI: 0.01, 0.48; low-quality evidence). However, there were no significant differences in MCS, PCS, self-efficacy, or NIHSS between the two groups. Sensitivity analysis showed that the results for SS-QOL and BI were unstable and should be interpreted with caution.

Conclusion

Nurse-led rehabilitation is effective in improving psychological outcomes, particularly depression (GDS-15) and pain, although this high-quality evidence is based on a single study. Functional independence (BI) and SS-QOL are also improved, but the evidence for these outcomes is of low quality and highly unstable in sensitivity analyses. No significant benefits are found for other outcomes. The evidence quality varies, and future high-quality studies are needed to confirm these findings.

Implications for the Profession and/or Patient Care

Incorporating nurse-led rehabilitation into stroke guidelines and implementing standardized depression screening programs and non-pharmacological pain interventions in community rehabilitation could be beneficial for populations with depressive symptoms and chronic pain.

Reporting Method

This study adhered to the PRISMA (Preferred Reporting Items for Systematic Reviews and Meta-Analyses) guidelines for transparent reporting of systematic reviews.

Patient or Public Contribution

This study did not include patient or public involvement in its design, conduct, or reporting.