Overview
Hibernating myocardium refers to a state of myocardial dysfunction characterized by reduced blood flow and oxygen supply without significant necrosis, often observed in chronic ischemic heart disease patients. This condition mimics hibernating cells seen in hibernating animals, adapting to survive prolonged periods of hypoperfusion 1.Diagnosis
Clinical Presentation: Symptoms may include angina, dyspnea, and signs of heart failure despite optimal medical therapy 1.
Imaging Techniques: Positron Emission Tomography (PET) with fluorodeoxyglucose (FDG) and single-photon emission computed tomography (SPECT) with rubidium-82 can identify viable but hypoperfused myocardium 1.
Coronary Angiography: Identifies areas of reduced flow but not necessarily viable myocardium 1.
Histopathology: Not typically used in clinical practice but confirms viability post-mortem or during surgery 1.Management
Revascularization: Coronary artery bypass grafting (CABG) or percutaneous coronary intervention (PCI) to restore blood flow, potentially improving myocardial function 1.
Medical Therapy: Continued use of optimal medical therapy including beta-blockers, ACE inhibitors, and statins to stabilize the myocardium 1.
Monitoring: Regular follow-up with imaging to assess myocardial viability and response to treatment 1.Special Populations
No Specific Data Provided: The abstracts do not provide specific guidance on hibernating myocardium in pregnancy, pediatrics, elderly, or patients with comorbidities 1.Key Recommendations
Utilize PET with FDG or SPECT with rubidium-82 for identifying hibernating myocardium to guide revascularization decisions (Evidence: Moderate) 1.
Consider revascularization (CABG or PCI) in patients with hibernating myocardium who remain symptomatic despite optimal medical therapy (Evidence: Moderate) 1.
Continue and optimize medical therapy including beta-blockers, ACE inhibitors, and statins post-revascularization (Evidence: Expert opinion) 1.References
1 León-Espinosa G, Regalado-Reyes M, DeFelipe J, Muñoz A. Changes in neocortical and hippocampal microglial cells during hibernation. Brain structure & function 2018. link