Computer simulation to estimate the effectiveness of carotid endarterectomy

Area of Science:

• Neurology
• Health Economics
• Medical Decision Making

Background:

• Transient ischaemic attacks (TIAs) are critical warning signs for stroke.
• Carotid endarterectomy (CEA) is a surgical procedure to reduce stroke risk.
• Evaluating the comparative effectiveness and cost-effectiveness of CEA versus medical management is crucial for patient care.

Purpose of the Study:

• To assess the benefit of carotid endarterectomy (CEA) compared to medical treatment for patients experiencing transient ischaemic attacks (TIAs).
• To analyze outcomes across diverse patient subgroups to understand differential benefits.

Main Methods:

• A Markov model was employed to simulate patient survival and quality of life.
• Quality-adjusted life months (QALMs) were used as the primary measure of benefit.
• Computer simulations utilized published data on event probabilities, with sensitivity analyses performed.

Main Results:

• The baseline model indicated a 3 QALM benefit for CEA in a 65-year-old male patient.
• Sensitivity analysis revealed potential benefits ranging from 13.4 QALMs to a loss of 2 QALMs.
• Approximately 80% of simulated factor combinations favored surgery, while 15.6% favored medical treatment.

Conclusions:

• Computer simulations can estimate treatment benefits for specific patient groups using clinical trial data.
• This simulation suggests CEA is unlikely to be cost-effective in the UK for many TIA patients, despite stroke risk reduction.
• Further integration with cost data can refine cost-effectiveness analyses for personalized treatment decisions.