P-137. Optimizing Endocarditis Risk Assessment: Validation of the HANDOC Score for Non-Beta Hemolytic Streptococcal Bacteremia in a Mixed Practice Hospital Setting

TL;DR

The study validates the HANDOC score for identifying low-risk non-beta hemolytic streptococcal bacteremia patients who may not need echocardiograms.

Contribution

Validation of the HANDOC score in a mixed hospital setting without a dedicated endocarditis team.

Findings

The HANDOC score had a 90% negative predictive value for ruling out endocarditis.

Patients with a HANDOC score < 2 can safely avoid transesophageal echocardiography.

Sepsis parameters were similar between patients with and without endocarditis.

Abstract

Non-β-hemolytic streptococci (NBHS) bacteremia is a cause of infective endocarditis (IE). The Duke criteria, while imperfect, are a cornerstone of standardization for the definition and diagnosis of IE. It is unfeasible to obtain a transesophageal echocardiography (TEE) on all NBHS bacteremic patients; The HANDOC score is a tool to identify patients at low risk of IE unlikely to need TEE, but its validation across patient populations is limited (Fig 1). We aimed to validate the HANDOC score in a hospital system with a mixed practice of academic and private groups and no dedicated IE team.

This retrospective study enrolled all patients with NBHS bacteremia admitted to a safety net hospital system in Detroit, MI from 1/2021-10/2024. IE was defined per 2023 modified Duke Criteria for definite IE. Clinical and microbiologic characteristics were collected. Patients were excluded if NBHS was a suspected contaminant, NBHS did not grow on culture, or if they expired or left against medical advice (Fig 2).

371 patients were included (63 with IE, and 308 without IE). IE patients were older with higher rates of cardiac conditions and drug use (Table 1). Sepsis parameters were similar between groups. The most common Duke criteria met for IE diagnosis was 2 major criteria (78%). Valve pathology was present in 11%. HANDOC score > 2 occurred in 73 patients (32 with IE, 41 without). The "H," "N," and Bovis group parameters were higher in the IE group, while community onset and other NBHS species were similar across groups. The HANDOC score had a NPV of 90% and specificity of 82% but a lower PPV and sensitivity (Table 2).

Diagnostic stewardship in IE is challenging due to the limitations of the Duke criteria and lack of dedicated IE team in most hospital systems. A HANDOC score < 2 can be used by clinicians to safely forego the need for an echocardiogram in NBHS, thereby decreasing resource use and unnecessary invasive testing.

All Authors: No reported disclosures

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