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Local Anesthetics: Clinical Application as Spinal Anesthesia01:11

Local Anesthetics: Clinical Application as Spinal Anesthesia

Spinal anesthetics are given during lower abdomen and limb surgeries to block sensory and motor neurons. They are administered in the mid to low lumbar regions, primarily acting on the cauda equina's nerve roots. The blockade level depends on the local anesthetic (LA) concentration. Usually, low LA concentrations are sufficient to block sensory fibers, while only high LA concentrations block motor fibers. Other factors like injection volume and speed, the patient's posture, and the drug...
Local Anesthetics: Clinical Application as Epidural Anesthesia01:29

Local Anesthetics: Clinical Application as Epidural Anesthesia

Epidural anesthetics are administered in the fat-filled epidural space, the outermost part of the spinal canal. This technique is commonly employed for pain management and anesthesia during lower abdomen and pelvis surgeries or labor and delivery.
Since epidural anesthetics can be infused through an epidural catheter, all types of drugs, including short-acting ones, can be administered. Chloroprocaine and lidocaine are examples of short and long-duration anesthetics, respectively. Bupivacaine...
Pain01:20

Pain

Pain serves as a critical warning signal that alerts the body to potential or actual harm. When mechanical pressure on the skin is intense, such as from a sharp pinch, the sensation transitions from touch to pain. Similarly, extreme temperatures, like a hot pot handle, convert the sensation of heat into pain. Pain can also result from overstimulation of other senses, such as blinding light, loud noise, or the intense heat from habañero peppers. This ability to sense pain is essential for...
Herniated Intervertebral Disc l: Introduction01:29

Herniated Intervertebral Disc l: Introduction

Intervertebral disc herniation refers to the displacement of the nucleus pulposus (the gel-like inner core of the disc) through a tear or weakened area in the annulus fibrosus (the outer fibrous ring). The displaced disc material extends beyond the normal boundaries of the disc space and may compress or irritate nearby spinal nerve roots or, less commonly, the spinal cord.Etiology and Risk FactorsHerniation commonly results from degeneration, in which aging reduces disc hydration and...
Degenerative Disc Disease I: Introduction01:27

Degenerative Disc Disease I: Introduction

Degenerative disc disease is a chronic condition in which intervertebral discs gradually lose structure and function. It is not infectious or autoimmune; rather, it results from age-related biochemical and mechanical changes, influenced by genetic, metabolic, and environmental factors.Structure and Function of DiscsThe spine contains 23 intervertebral discs that absorb load, distribute forces, maintain spacing, and allow flexibility. Each disc consists of a nucleus pulposus, a gel-like core...
Degenerative Disc Disease ll: Pathophysiology01:23

Degenerative Disc Disease ll: Pathophysiology

The symptoms of degenerative disc disease arise from a combination of mechanical compression, vascular compromise, and biochemical inflammation, which together disrupt nerve function and produce pain.Mechanical CompressionDisc degeneration reduces height and elasticity, predisposing to herniation of the nucleus pulposus, a major cause of radicular pain. Herniations may be protrusion (bulging with intact annulus), extrusion (nucleus extends beyond disc but remains connected), or sequestration...

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Updated: Jun 22, 2026

A Knowledge Graph Approach to Elucidate the Role of Organellar Pathways in Disease via Biomedical Reports
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A Knowledge Graph Approach to Elucidate the Role of Organellar Pathways in Disease via Biomedical Reports

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大規模言語モデルと知識グラフによる知識拡張因果発見:慢性腰痛への応用

Damon Lin, Marzieh Mussavi Rizi, Conor O'Neill

    medRxiv : the preprint server for health sciences
    |February 27, 2026
    PubMed
    まとめ

    知識グラフベースの検索拡張生成(GraphRAG)は、慢性腰痛の因果発見を大幅に改善し、標準的なRAGおよび大規模言語モデルを上回る性能を示した。

    科学分野:

    • 因果推論と人工知能、特に生物医学研究への応用。

    背景:

    • データ駆動型の因果発見は、データセットの制約と外部知識の欠如によって制限される。
    • 大規模言語モデル(LLM)と検索拡張生成(RAG)は、因果発見を拡張する可能性を提供する。

    研究 の 目的:

    • 慢性腰痛の因果発見を拡張するための知識グラフベースのRAG(GraphRAG)を評価する。
    • GraphRAGの性能を、LLM拡張、RAG拡張、およびデータ単独の因果発見と比較する。

    主な方法:

    • 慢性腰痛の因果関係に関する専門家定義の因果グラフを正解データとして利用した。
    • 因果発見のためにGraphRAG、RAG、およびLLM拡張を実装し、ベンチマークを行った。
    • 因果関係評価のための様々なプロンプト戦略を検討した。

    主要な成果:

    • GraphRAGは、因果発見の拡張において最も高いF1スコア(0.745)を達成した。
    • GraphRAGは、RAG(0.714)、LLM拡張(0.636)、データ単独での発見(0.396)を上回った。

    結論:

    • GraphRAGは、因果発見の拡張において重要な進歩を表す。
    • グラフベースのRAGを介してドメイン知識を統合することで、慢性腰痛のような複雑な状態の因果モデリングを加速できる可能性がある。
    キーワード:
    因果推論大規模言語モデル知識グラフ検索拡張生成慢性腰痛AI機械学習

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