Very Mild Hypothermia During Ischemia and Reperfusion Improves Postinfarction Ventricular Remodeling

Citations of this article
Mendeley users who have this article in their library.


Background: Mild hypothermia (< 4°C) improves myocardial salvage after infarct reperfusion in animals and in early clinical studies. In this experiment the effect of mild hypothermia during ischemia and early reperfusion on long-term postinfarction left ventricular (LV) remodeling was assessed in an ovine infarct model. Methods: In the initial phase of the experiment the effect of progressive degrees of hypothermia on infarct size was quantified. Thirty-eight male sheep were subjected to 1 hour of ischemia using a standardized anteroapical infarct followed by 3 hours of reperfusion. Temperature was maintained at either 39.5°C (n = 11), 38.5°C (n = 7), 37.5°C (n = 7), 36.5°C (n = 7), or 35.5°C (n = 6) for the entire period of ischemia and reperfusion. The area at risk (AR) and infarct size as a percentage of AR (I/AR) were determined with a double staining and planimetry technique. In the second phase of the study, chronic post-infarction remodeling was assessed in animals with nonreperfused infarcts (n = 6), 1 hour of ischemia followed by reperfusion at 39.5°C (n = 6) and 1 hour of ischemia followed by reperfusion at 37.5°C (n = 6). Remodeling was determined at 8 weeks after infarction using echocardiography. Results: The I/AR in the 39.5°C, 38.5°C, 37.5°C, 36.5°C, and the 35.5°C groups was 71.8 ± 3.0%, 63.1 ± 1.9%, 49.4 ± 1.4%, 38.7 ± 1.4%, and 21.7 ± 2.2%, respectively (p < 0.05 between all groups). In the chronic study LV end systolic volume at 8 weeks after infarction was 81 ± 8 mL in the nonreperfused group, 57 ± 4 mL in the 39.5°C reperfusion group, and 41 ± 3 mL in the 37.5°C reperfusion group (p < 0.05 for between group differences). Conclusions: Subtle degrees of hypothermia can significantly improve immediate myocardial salvage and long-term LV remodeling after infarct reperfusion. © 2009 The Society of Thoracic Surgeons.




Hamamoto, H., Sakamoto, H., Leshnower, B. G., Parish, L. M., Kanemoto, S., Hinmon, R., … Gorman, R. C. (2009). Very Mild Hypothermia During Ischemia and Reperfusion Improves Postinfarction Ventricular Remodeling. Annals of Thoracic Surgery, 87(1), 172–177.

Register to see more suggestions

Mendeley helps you to discover research relevant for your work.

Already have an account?

Save time finding and organizing research with Mendeley

Sign up for free