# Risk Assessment in Cannulation for Minimally Invasive Heart Valve Surgery: The Modified HOSTILE Score

## TL;DR

The MOD-HOSTILE score helps predict vascular and neurological risks in minimally invasive heart valve surgery, guiding better surgical planning.

## Contribution

The paper introduces a modified version of the HOSTILE score (MOD-HOSTILE) for use in minimally invasive valve surgery and validates its predictive value for neurological outcomes.

## Key findings

- High MOD-HOSTILE scores correlate with increased stroke and hemiplegia risks in minimally invasive valve surgery.
- MOD-HOSTILE scores ≥5 indicate elevated risk for stroke and delirium, suggesting the need for alternative surgical strategies.
- The score predicted stroke with an AUC of 0.78 and an odds ratio of 1.4 per point.

## Abstract

Objectives: The HOSTILE score was developed to assess femoral access challenges in transcatheter valve therapy. Similar vascular issues arise in femoral cannulation for minimally invasive valve surgery, making CT-based planning essential. We adapted the score for surgical use (MOD-HOSTILE) and evaluated its association with neurological and adverse outcomes. Methods: In this single-center retrospective study, the MOD-HOSTILE score (0–11 points) was calculated for 364 patients undergoing minimally invasive heart valve surgery from 2019 to 2023. Patients were stratified into low (0–2), mild (>2–5), and high (>5–11) score categories. Outcomes included 30-day stroke, other neurological events, and perioperative complications. Results: High MOD-HOSTILE patients were significantly older (70 [64.7–73.0] vs. 61 [60.0–63.0] years; p < 0.01) and had higher surgical risk (EuroSCORE II 1.79 [1.26–2.16] vs. 0.83 [0.75–0.94]; p < 0.01). Neurological complications were more frequent in the high MOD-HOSTILE group, including stroke (8.7% vs. 0.9%; p = 0.02) and hemiplegia (13.0% vs. 0.9%; p < 0.01). Axillary cannulated patients had higher MOD-HOSTILE scores than femoral cannulated patients. Stroke risk was highest in patients with high MOD-HOSTILE score undergoing axillary cannulation (high vs. low MOD-HOSTILE, 18.2% vs. 0%; p = 0.04). Thirty-day mortality was comparable between groups (p = 0.09). MOD-HOSTILE predicted stroke with an AUC of 0.78 (95% CI 0.73–0.82) and OR 1.4 per point (95% CI 1.1–2.0). Conclusions: The MOD-HOSTILE score identifies vascular and neurological risk in minimally invasive valve surgery, with scores ≥5 indicating elevated risk of stroke and delirium. Patients with high scores may benefit from alternative surgical strategies.