Date Approved
9-4-2019
Embargo Period
9-5-2019
Document Type
Thesis
Degree Name
M.S. Mechanical Engineering
Department
Mechanical Engineering
College
Henry M. Rowan College of Engineering
Sponsor
NIH
Advisor
Merrill, Thomas L.
Committee Member 1
Mitchell, Jennifer
Committee Member 2
Haas, Francis M.
Keywords
Acute Myocardial Infarction, Infarct, Left Main Coronary Artery, Localized Therapeutic Hypothermia, Patient-Specific
Subject(s)
Heart failure--Treatment
Disciplines
Biomedical Engineering and Bioengineering | Mechanical Engineering
Abstract
Acute Myocardial Infarction (AMI) is the leading cause of worldwide death and disability, and approximately 720,000 Americans will experience an AMI in 2018. Studies have shown that rapid hypothermia therapy (<35°C) before reperfusion in patients with AMI can reduce infarct size by 37%. Localized therapeutic hypothermia has proven the potential to cool heart tissue rapidly following AMI, 3°C in 5 minutes. Using Materialise Mimics digital imaging software and the finite volume method we analyzed temperature distributions in six patient-specific left main coronary artery (LMCA) models. A mock circulatory loop was used to determine the exiting temperatures of a standard 7 Fr catheter to feed into our model with flow rates ranging from 29.2 ml/min to 68.85 ml/min. Our work showed that therapeutic hypothermia (TH) temperatures were evident at the outlets of three out of all six heart models, which varied in each left anterior descending (LAD) and left circumflex (LCX) artery depending on flowrate. Results of this study indicate that biovariability in patient-specific vascular structures significantly impacts therapeutic hypothermia (TH) treatment methods. These results indicate that further research is needed to examine more accurate physiological effects, such as pulsatile flow and vessel wall thickness. Future models will be used to provide insight to guide more efficient TH device designs and operation parameters to optimize patient outcomes following AMI.
Recommended Citation
Spangenberg, Nathan Paul, "The impact of patient-specific vascular structure on localized cooling in the human heart" (2019). Theses and Dissertations. 2733.
https://rdw.rowan.edu/etd/2733