Sakitamiwa Classification Jun 2026

The Sakita-Miwa classification is not just for tracking; it helps dictate treatment effectiveness.

Slough becomes thinner; regenerative epithelium begins to appear.

The active phase represents the acute, fully formed ulceration where tissue loss is prominent and the risk of complications like upper gastrointestinal bleeding is elevated.

signals successful recovery, though clinicians must still monitor for underlying causes like sakitamiwa classification

The ulcer is almost gone, with a very small, thin white coating, and regenerative tissue is present. 3. Scarring Stage (S)

Patients staged within 48 hours of fever onset who receive stage-appropriate therapy (e.g., early ribavirin for Stage I; plasma exchange for Stage III) have a 54% relative risk reduction in progression to Stage IV (NNT = 6). Importantly, the Classification also identifies a subset of (> 5,000 ng/mL) – termed "Sakitamiwa Macrophage Activation Syndrome" – which responds to anakinra (IL-1 blockade) but not corticosteroids.

It allows physicians to measure the ulcer reduction rate, such as comparing the effectiveness of different Proton Pump Inhibitors (PPIs) or potassium-competitive acid blockers (P-CABs) like vonoprazan. The Sakita-Miwa classification is not just for tracking;

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The ulcer crater is still visible, but the margins become sharper and the diameter of the defect shrinks to about half or two-thirds of the A1 stage. Regenerating epithelium (new skin) starts appearing at the edges.

The ulcer has disappeared, replaced by a red scar consisting of young, delicate tissue. S2 (Scarring 2/White Scar): Importantly, the Classification also identifies a subset of

Over several months to years, the redness fades. The scar becomes the same color as the surrounding tissue, often appearing as a "white scar".

[ A1 -> A2 ] -------------> [ H1 -> H2 ] -------------> [ S1 -> S2 ] Active Phase Healing Phase Scarring Phase (Slough & Edema) (Epithelial Regeneration) (Red/White Fibrosis) 1. The Active Stage (A-Stage)

By providing a clear, chronological roadmap of ulcer development, the Sakita-Miwa classification remains a "gold standard" in endoscopic reporting. It bridges the gap between a single visual observation and a comprehensive treatment plan, ensuring that patients receive care tailored to the specific biological state of their condition. specific treatments typically prescribed for each of these stages?