Coronary artery calcium on standard chest computed tomography predicts cardiovascular events after liver transplantation

Int J Cardiol. 2021 Sep 15:339:219-224. doi: 10.1016/j.ijcard.2021.06.046. Epub 2021 Jun 26.

Abstract

Aims: Cardiac complications are a leading cause of mortality after orthotopic liver transplantation (LT) and pre-operative risk stratification is challenging. We evaluated whether coronary artery calcium (CAC) score calculated on a standard (non-thin layer, non-ECG gated) chest computed tomography (CT) predicted cardiac outcome after LT.

Methods: We included a consecutive series of LT recipients who underwent pre-operative cardiac evaluation including stress-testing or cardiac catheterization in high-risk patients. Patients with a history of coronary artery disease or coronary revascularization were excluded. The CAC score was calculated from the chest CT routinely performed before LT. CAC values were not available at the time of pre-transplant cardiac evaluation and did not affect LT eligibility. The primary end-point included peri-operative arrhythmic cardiac arrest and sustained ventricular arrhythmias; heart failure, myocardial infarction and cardiac death within 1-year after LT.

Results: The study population consisted of 301 patients (median age 56 years, 76% males). At chest CT, 49% had CAC = 0; 27% had CAC = 1-99, 15% had CAC = 100-399 and 9% CAC > 400. The primary end-point incidence increased from 7% in patients with CAC = 0 to 27% in patients with CAC > 400 (p = 0.007). At multivariable analysis including traditional risk factors, CAC remained an independent predictor of cardiac events (p = 0.01).

Conclusions: CAC score calculated on a standard chest CT stratified the risk of cardiac events in patients who underwent LT after negative pre-transplant cardiac evaluation. These findings suggest that evaluation of CAC from a standard chest CT performed for other reasons can be used as an early cardiac risk stratification tool before LT.

Keywords: Cardiac CT; Cardiology; Coronary artery disease; Liver cirrhosis; Non-cardiac surgery.

MeSH terms

  • Calcium
  • Coronary Angiography
  • Coronary Artery Disease* / diagnostic imaging
  • Coronary Artery Disease* / surgery
  • Coronary Vessels / diagnostic imaging
  • Coronary Vessels / surgery
  • Female
  • Humans
  • Liver Transplantation* / adverse effects
  • Male
  • Middle Aged
  • Predictive Value of Tests
  • Risk Factors
  • Tomography, X-Ray Computed
  • Vascular Calcification*

Substances

  • Calcium