# Relationship between first pass effect NLR and PLR in mechanical thrombectomy for acute anterior circulation large-vessel occlusion

## TL;DR

This study found that higher neutrophil-lymphocyte and platelet-lymphocyte ratios are linked to lower success rates in first-pass mechanical thrombectomy for stroke.

## Contribution

The study identifies NLR and PLR as independent predictors of first-pass effect success in mechanical thrombectomy for acute stroke.

## Key findings

- Higher NLR and PLR levels were significantly associated with lower first-pass effect success.
- Critical threshold values of 4.34 for NLR and 148.03 for PLR were identified using ROC curves.
- Both ratios independently predicted FPE risk in multivariate analysis.

## Abstract

The study investigated the correlation between the neutrophil-lymphocyte ratio (NLR) and the platelet-lymphocyte ratio (PLR) concerning the first-pass effect (FPE) observed during mechanical thrombectomy subsequent to acute ischemic stroke (AIS).

Patients diagnosed with AIS in the anterior circulation, who underwent mechanical thrombectomy between January 2020 and December 2022, were assessed. Various data were collected, including blood cell counts, general information, relevant surgical and clinical details, and functional outcomes determined by the Modified Rankin Scale (MRS) score ≤2 at 3 months. Logistic regression was utilized to identify independent factors predicting the first-pass effect (FPE) and to explore the associations between FPE and the NLR and PLR. Critical NLR and PLR values were examined using Receiver-operating characteristics (ROC) curves.

A total of 233 patients were enrolled and categorized into either the FPE or MPE groups based on the success of the initial thrombectomy. The FPE group showed significant distinctions compared to the MPE group in both NLR and PLR levels: NLR (3.63 vs. 4.90, p < 0.001), PLR (134.92 vs. 164.77, p = 0.001). Both univariate and multivariate regression analyses demonstrated the independent predictive ability of NLR and PLR for assessing the risk of FPE during mechanical thrombectomy, with NLR (Adjusted Odds ratio (OR) 0.764; 95% CI 0.665–0.878, p = 0.001) and PLR (Adjusted OR0.993; 95% CI 0.989–0.998, p = 0.002). Moreover, the ROC curves delineated critical threshold values of 4.34 and 148.03 for NLR and PLR, respectively.

The increase of NLR and PLR may be related to the failure of FPE.