prague_cm_classification: Prague C & M Criteria for Barrett's Esophagus

In cliot: Clinical Indices and Outcomes Tools

Prague C & M Criteria for Barrett's Esophagus

Description

Calculates the Prague C & M classification for characterizing the extent of Barrett's Esophagus. It uses endoscopic measurements (distance from incisors) to determine the circumferential (C) and maximum (M) extent of metaplasia relative to the gastroesophageal junction (GEJ).

Usage

prague_cm_classification(ge_junction_distance_cm,
                         circumferential_metaplasia_proximal_cm,
                         max_metaplasia_proximal_cm)

Arguments

ge_junction_distance_cm	Numeric. Distance from the incisors to the gastroesophageal junction (GEJ) in centimeters.
circumferential_metaplasia_proximal_cm	Numeric. Distance from the incisors to the proximal margin of the circumferential metaplasia in centimeters.
max_metaplasia_proximal_cm	Numeric. Distance from the incisors to the proximal margin of the maximum extent of metaplasia (tongues/islands) in centimeters.

Value

A list containing:

Prague_Classification	The formatted classification string (e.g., "C2M5").
C_Length_cm	The calculated length of the circumferential segment.
M_Length_cm	The calculated maximum length of the metaplastic segment.

References

Sharma P, Dent J, Armstrong D, et al. The Development and Validation of an Endoscopic Grading System for Barrett's Esophagus: The Prague C & M Criteria. Gastroenterology. 2006;131(5):1392-1399. doi:10.1053/j.gastro.2006.08.032

Examples

# Example 1: Long segment
# GEJ at 40cm, Circumferential at 37cm, Max tongue at 32cm
# C = 40-37 = 3, M = 40-32 = 8 -> C3M8
prague_cm_classification(40, 37, 32)

# Example 2: Short segment (No circumferential)
# GEJ at 38cm, Circumferential at 38cm (none), Max tongue at 36cm
# C = 0, M = 2 -> C0M2
prague_cm_classification(38, 38, 36)

cliot documentation built on Dec. 1, 2025, 1:06 a.m.