Amniotic Infection Syndrome: Nosology and Reproducibility of Placental Reaction Patterns

TLDR

Placental examination aims to inform etiology, prognosis, and recurrence risk of pregnancy disorders. The study assembled and validated a comprehensive set of placental reaction patterns for amniotic fluid infection to establish a standardized diagnostic framework for pathologists. Six pathologists blindly reviewed 14 amniotic fluid infection cases and 6 controls using agreed criteria, refined the criteria after initial results, and used majority vote as the gold standard, with reproducibility assessed via unweighted kappa values. Grading and staging of maternal and fetal inflammatory responses were more reproducible with a two‑tiered grading system than a three‑tiered one (81% vs 71% agreement), with sensitivity, specificity, and efficiency ranging from 67–100% (24 of 30 observations >90%) and kappa values indicating substantial agreement for most lesions, and the authors suggest that adopting this reproducible terminology could.

Abstract

Clinically responsive placental examination seeks to provide useful information regarding the etiology, prognosis, and recurrence risk of pregnancy disorders. The purpose of this study was to assemble and validate a complete set of the placental reaction patterns seen with amniotic fluid infection in the hope that this might provide a standardized diagnostic framework useful for practicing pathologists. Study cases (14 with amniotic fluid infection, 6 controls) were reviewed blindly by six pathologists after agreement on a standard set of diagnostic criteria. After analysis of initial results, criteria were refined and a second, overlapping set of cases were reviewed. Majority vote served as the gold standard. Grading and staging of maternal and fetal inflammatory responses was found to be more reproducible using a two- versus three-tiered grading system than a three- versus five-tiered staging system (overall agreement 81% vs. 71%). Sensitivity, specificity, and efficiency for individual observations ranged from 67-100% (24/30 > 90%). Reproducibility was measured by unweighted kappa values and interpreted as follows: < 0.2, poor; 0.2-0.6, fair/moderate; > 0.6, substantial. Kappa values for the 12 lesions evaluated in 20 cases by the six pathologists were: acute chorioamnionitis/maternal inflammatory response (any, 0.93; severe 0.76; advanced stage, 0.49); chronic (subacute) chorioamnionitis (0.25); acute chorioamnionitis/fetal inflammatory response (any, 0.90; severe, 0.55; advanced stage, 0.52); chorionic vessel thrombi (0.37); peripheral funisitis (0.84); acute villitis (0.90); acute intervillositis/intervillous abscesses (0.65), and decidual plasma cells (0.30). Adoption of this clearly defined, clinically relevant, and pathologically reproducible terminology could enhance clinicopathologic correlation and provide a framework for future clinical research.