The Sakita-Miwa classification is a widely used system in gastroenterology for staging the progression and healing of gastric and duodenal ulcers. First described by Sakita and Miwa, this classification helps clinicians determine whether an ulcer is in an active, healing, or scarring phase based on its endoscopic appearance. The Six Stages of Sakita-Miwa Classification
The system categorizes ulcers into three main stages, each subdivided into two further phases. 1. Active Stage (Stage A) This represents the acute phase of the ulcer.
A1 (Active 1): The ulcer is deep with a thick white or yellow slough (exudate) at the base. The margins are sharp and often swollen, sometimes referred to as the "lip-like sign".
A2 (Active 2): The edema at the ulcer margin begins to subside, and the "lip-like sign" is less prominent. The ulcer base remains covered with slough. 2. Healing Stage (Stage H)
The ulcer begins to shrink and the body starts the repair process.
H1 (Healing 1): A regenerating epithelium begins to form at the edges, and the white coating at the base starts to thin and shrink.
H2 (Healing 2): The ulcer becomes significantly smaller and shallower. The regenerating epithelium covers more of the base, and the white coating is significantly reduced. 3. Scarring Stage (Stage S) The ulcer has essentially closed, leaving behind a scar.
S1 (Scar 1/Red Scar): The white coating has completely disappeared, and the area is covered by newly formed, reddish regenerating epithelium. This is often called a "red scar".
S2 (Scar 2/White Scar): Over several months, the redness fades, and the area becomes pale or white, matching the surrounding mucosa. This is known as a "white scar". Clinical Significance Clinicians use this classification to:
Monitor Healing: Track the progress of treatment (e.g., using Proton Pump Inhibitors) over time. sakitamiwa classification
Standardize Communication: Provide a universal language for endoscopists to describe ulcer activity.
Research: Use as a primary or secondary endpoint in clinical trials for new gastroprotective drugs.
The Sakita-Miwa classification (originally Sakita et al., 1971) is an endoscopic staging system used to categorize the lifecycle and healing progress of peptic ulcers. It is primarily used in East Asian clinical practice to assess gastric and duodenal ulcers.
The system divides ulcer progression into three main stages (Active, Healing, and Scarring), with each further subdivided into two sub-stages: 1. Active Stage (A) This stage represents the early, acute phase of the ulcer.
A1 (Active-1): The ulcer is at its peak activity. It is characterized by a thick white-plaque coating (slough), discrete margins, and significant surrounding edema.
A2 (Active-2): The edema begins to subside, and the ulcer margins become clearer. The mucus coating remains prominent. 2. Healing Stage (H) In this stage, signs of tissue repair become visible.
H1 (Healing-1): Regenerative epithelium (new skin-like tissue) begins to appear at the edges, making the ulcer shallower. The white coating starts to shrink.
H2 (Healing-2): The regenerative epithelium nearly covers the mucosal break. The ulcer is significantly smaller, and the coating is minimal. 3. Scarring Stage (S) This stage indicates complete or near-complete healing.
S1 (Scar-1 / Red Scar): The mucosal defect has closed. A red, flat scar is visible, representing new, highly vascularized tissue. The Sakita-Miwa classification is a widely used system
S2 (Scar-2 / White Scar): The final stage of healing. The redness disappears, leaving a white, flat scar as fibrous tissue matures and capillary density decreases. Summary Table Clinical Feature Highlights Active Thick white coating, edema, discrete margins Healing Epithelial regeneration, shallower base, shrinking coating Scarring Complete closure; initially red, maturing into a white scar
While the Forrest classification is typically used to assess bleeding risk, the Sakita-Miwa system is preferred for monitoring the quality and rate of healing over time.
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The Sakita-Miwa classification is a standardized medical staging system used primarily in East Asian clinical practice to evaluate the healing process of gastric and duodenal ulcers. It breaks down the "life cycle" of an ulcer into six distinct stages categorized under three main phases: Active, Healing, and Scarring. Active Phase (A)
This is the initial stage where the ulcer is fully formed and "open."
A1 (Active 1): The ulcer is at its peak. The surrounding mucosa (lining) is swollen and red, and the ulcer floor is covered with a thick "white coating" (slough).
A2 (Active 2): The swelling around the edges begins to subside, but the white coating remains thick and the ulcer crater is still very distinct. Healing Phase (H)
In this phase, the body begins to repair the damage and "fill in" the crater.
H1 (Healing 1): 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. Prognosis and Follow-up
H2 (Healing 2): The defect becomes much smaller. New regenerating epithelium covers most of the ulcer floor, though a small white coating may still be visible. Scarring Phase (S)
This is the final stage where the ulcer has effectively closed.
S1 (Scarring 1/Red Scar): The white coating has completely disappeared, and new epithelium fully covers the floor. Because the new tissue is thin and has many blood vessels, it appears as a "red scar".
S2 (Scarring 2/White Scar): Over several months to years, the redness fades. The scar becomes the same color as the surrounding tissue, often appearing as a "white scar".
💡 Clinical SignificanceDoctors use this system to determine if a treatment—like proton pump inhibitors (PPIs)—is working. An ulcer is medically considered "cured" once it reaches the S1 or S2 stage.
This is for informational purposes only. For medical advice or diagnosis, consult a professional. AI responses may include mistakes. Learn more
Despite its utility, the Sakitamiwa Classification is not without critics. Key limitations include:
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