Calculated Hematological Indices as Predictors of Cardiovascular Complications in Noncardiac Surgery (Pilot Study)

Abstract

The objective: to study the prognostic significance of the ratio of the absolute number of neutrophils to lymphocytes (NLR) and platelets to lymphocytes (PLR) in assessing the risk of cardiovascular complications in non-cardiac surgical interventions.Subjects and Methods. 85 patients aged 66 [61‒70] years who underwent elective vascular surgery were examined.Results. Concomitant circulatory diseases were diagnosed in 98.8%. PLR < 91.2 with the sensitivity of 60% and the specificity of 67.8% was associated with diabetes mellitus (AUC – 0.686; 95% CI 0.576‒0.783, p = 0.0022). Cardiovascular complications were registered in 9.3% of patients. NLR was an independent predictor of cardiovascular complications: OR – 5.216; 95% CI 1.246‒21.826, p = 0.005. NLR > 2.1 discriminated cardiovascular complications with the sensitivity of 75% and specificity of 75% (AUC – 0.827; 95% CI 0.690–0.921; p = 0.004). PLR was also a predictor of cardiovascular complications: OR – 1.0111; 95% CI 1.0001–1.0223; p = 0.027. PLR > 105.5 allowed identifying patients with NT-proBNP > 650 pg/ml with the sensitivity of 75.0% and the specificity of 61.8% (AUC – 0.740; 95% CI 0.630‒0.832; p = 0.0308).Conclusion. NLR and PLR can be used to identify patients with increased cardiac risk when undergoing vascular surgery. Further research in this field is advisable.

Keywords

• neutrophils-lymphocytes ratio
• platelets-lymphocytes ratio
• cardiovascular complications
• predictors of cardiac complications
• non-cardiac surgery
• cardiac risk indices