Objective: The aim of this study was to systematically evaluate the therapeutic effects of Dihuang Yinzi decoction on Alzheimer's disease (AD) and provide a medical evidence-based clinical application of traditional Chinese medicine (TCM).

Methods: A comprehensive search was conducted across multiple databases, including PubMed, Embase, Cochrane Library, China National Journals Full-text Database, VIP Database for Chinese Technical Periodicals, Wan Fang database, and SinoMed database, to collect clinical randomized controlled trials of Dihuang Yinzi decoction in the treatment of AD. Strict literature screening was performed based on predefined inclusion and exclusion criteria. The Cochrane Collaboration risk of bias assessment tool and the Grading of Recommendations Assessment, Development, and Evaluation (GRADE) system recommendation-level method was used to assess the quality of the included studies. Review Manager 5.4 and Stata 17 software were used for data synthesis and processing, while GRADE Profiler 3.6 software was used to evaluate the quality of evidence for outcome indicators (risk ratio, standardized mean difference, and weighted mean difference).

Results: A total of 11 studies involving 798 patients met the inclusion criteria. Dihuang Yinzi decoction, whether used alone or in combination with conventional Western medicine, demonstrated superior efficacy compared to conventional Western medicine alone in improving the clinical effective rate, TCM syndrome score, activity of daily living score, Mini-Mental State Examination score, and Hasegawa Dementia Scale score in AD treatment. Furthermore, it exhibited a favorable safety profile. However, the GRADE evidence quality rating for the included studies was low.

Conclusions: Dihuang Yinzi decoction, either used alone or in combination with conventional Western medicine, shows promising results in enhancing cognitive and memory functions as well as the self-care ability of patients with AD. However, the low GRADE evidence quality rating highlights the need for focused advancements in the planning and execution of clinical randomized controlled trials during future research attempts.

Unlabelled: ZIELZiel dieser Studie ist es, die therapeutischen Effekte von Dihuang Yinzi-Dekokt auf die Alzheimer-Krankheit systematisch zu bewerten und eine evidenzbasierte klinische Anwendung der traditionellen chinesischen Medizin (TCM) bereitzustellen.MethodenEs wurde eine umfassende Suche in mehreren Datenbanken, darunter PubMed, Embase, Cochrane Library, China National Journals Volltext-Datenbank, VIP Database for Chinese Technical Periodicals, Wan Fang Datenbank und SinoMed-Datenbank durchgeführt, um randomisierte, kontrollierte klinische Studien zu Dihuang Yinzi-Dekokt in der Behandlung der Alzheimer-Krankheit zu erfassen. Die strenge Literatursuche erfolgte auf Grundlage von vordefinierten Ein-und Ausschlusskriterien. Zur Bewertung der Qualität der eingeschlossenen Studien wurden das Risk-of-Bias-Tool von Cochrane und das GRADE (Grading of Recommendations Assessment, Development, and Evaluation)-System zur Beurteilung der Empfehlungsgrade herangezogen. Die Datensynthese und -verarbeitung erfolgten mithilfe der Review Manager 5.4- und der Stata 17-Software, während für die Bewertung der Evidenzqualität der Outcome-Indikatoren (Risikoverhältnis, standardisierte Mittelwertdifferenz und gewichtete Mittelwertdifferenz) die Software GRADE Profiler 3.6 verwendet wurde.ErgebnisseInsgesamt erfüllten 11 Studien, an denen 798 Patienten teilnahmen, die Einschlusskriterien. Dihuang Yinzi-Dekokt zeigte allein oder in Kombination mit konventioneller westlicher Medizin eine überlegene Wirksamkeit gegenüber der alleinigen Verwendung von konventioneller westlicher Medizin in Bezug auf die klinische Gesamtwirksamkeitsrate, den TCM-Syndrom-Score, den Score für die Alltagsaktivitäten, den Mini-Mental State Examination-Score und den Score der Hasegawa-Demenz-Skala in der Behandlung der Alzheimer-Krankheit. Darüber hinaus wies es ein günstiges Sicherheitsprofil auf. Die Evidenzqualität der eingeschlossenen Studien gemäß GRADE wurde jedoch als gering eingestuft.SchlussfolgerungenDihuang Yinzi-Dekokt zeigt allein oder in Kombination mit konventioneller westlicher Medizin vielversprechende Ergebnisse in Bezug auf die Verbesserung der kognitiven und Gedächtnisfunktionen sowie die Selbstversorgungsfähigkeit von Alzheimer-Patienten. Die niedrige Bewertung der Evidenzqualität gemäß GRADE unterstreicht jedoch die Notwendigkeit von zielgerichteten Weiterentwicklungen bei der Planung und Durchführung von randomisierten, kontrollierten klinischen Studien in zukünftigen Forschungsunternehmungen.

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