# Effect of Peri-Interventional Blood Loss on In-Stent Thrombosis After Percutaneous Coronary Intervention in Patients with Acute Myocardial Infarction

## TL;DR

This study finds that blood loss during heart procedures increases the risk of stent blockage and the need for further treatment in heart attack patients.

## Contribution

The study identifies a novel association between peri-interventional blood loss and in-stent stenosis after PCI in AMI patients.

## Key findings

- Higher blood loss during PCI is linked to increased in-stent stenosis rates.
- Severe blood loss groups had a 61.1% revascularization rate compared to 19.3% in mild cases.
- The hazard ratio for revascularization was 1.35 for increased blood loss.

## Abstract

This paper evaluates the effect of blood loss on in-stent stenosis after percutaneous coronary intervention (PCI) in patients with acute myocardial infarction (AMI). Nine hundred and ninety-seven patients who underwent PCI for AMI as well as follow-up coronary angiography at 6–12 months from two centers were categorized into three groups based on peri-interventional blood loss at the primary intervention (mild, <1 mmol/L moderate, 1–2 mmol/L; severe > 2 mmol/L). The endpoint was to evaluate the incidence and severity of in-stent stenosis at follow-up angiography and the revascularization rate. The incidence of in-stent stenosis and revascularization in mild, moderate, and severe groups was 19.3%, 33.1%, and 61.1%, respectively (p = 0.001), with HR: 1.35 (95% CI; 1.10–1.65), p < 0.001. Peri-interventional blood loss was associated with a higher incidence of in-stent stenosis and revascularization 6–12 months after successful PCI in patients with AMI.