Which test is performed to detect stunned (reversible) myocardial ischemia? (PNQ)
1. LV dysfunction can be due to noncontractile or hypocontractile segments that are viable but are chronically ischemic (hibernating myocardium). (AIIMS May 2011)
2. As a consequence of chronic reduction in myocardial blood flow these segments down regulate their contractile function.
3. These can be detected by using radionuclide scans of myocardial perfusion and metabolism, PET, or delayed scanning with thallium-201; or by improvement of regional functional impairment, provoked by low-dose dobutamine.
4. In such patients, revascularization improves myocardial blood flow, can return function, and can improve survival. (Ref. Hari-18th ed., Pg-2013)
Recent Advancesin Nuclear imaging
a. Thallium scan
b. Technetium 99 scan
c. PET using N-13 NH3 or rubidium 82