Extensive or Restricted Ultrasound Protocols to Measure Carotid Intima-Media Thickness: Analysis of Completeness Rates and Impact on Observed Rates of Change Over Time

High levels of complete data can be obtained with extensive ultrasound protocols that include measurement from the carotid bifurcation and internal carotid artery. A high body mass index contributes to incompleteness of CIMT measurements. Extensive ultrasound protocols are required to obtain the highest precision to observe a treatment effect and to fully cover the degree of atherosclerotic burden.