Early recognition of regional cardiac ischemia using a 3-axis accelerometer sensor

Area of Science:

• Biomedical Engineering
• Cardiovascular Research
• Diagnostic Technology

Background:

• Perioperative mortality in coronary artery bypass grafting (CABG) is often linked to reduced left ventricular function caused by myocardial ischemia or infarction.
• Post-operative graft occlusion is a significant complication in coronary surgery, potentially leading to adverse cardiac events.

Purpose of the Study:

• To introduce and evaluate a novel method for detecting regional cardiac ischemia using a 3-axis piezoelectric accelerometer.
• To assess the potential of this technology for early detection of graft malfunction in cardiac surgery.

Main Methods:

• A 3-axis piezoelectric accelerometer was attached to the left ventricle's free wall in three anesthetized pigs.
• The left anterior descending artery was occluded for varying durations while accelerometer data were collected.
• Short-time Fourier transform analysis and 2D time-frequency plots were used to analyze the accelerometer data.

Main Results:

• Occlusion of the coronary artery led to a detectable change in the power of higher harmonics in the accelerometer data.
• A distinct rise in the absolute difference value between instant and reference frequency patterns was observed during occlusion.
• These changes indicate a potential for real-time monitoring of myocardial ischemia.

Conclusions:

• Preliminary findings suggest that analyzing 3-axis accelerometer data can enable early recognition of regional cardiac ischemia.
• This non-invasive monitoring approach may facilitate timely intervention for malfunctioning grafts in cardiac surgery.
• Further research is warranted to validate this promising diagnostic tool in clinical settings.