system
Medical AI Inquiry: You was designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.  Labels: UNASSIGNED, METHODS, RESULTS. Meshes: Aged, Autonomic Nervous System Diseases, Ephedrine, Female, Heart Failure, Humans, Image Interpretation, Computer-Assisted, Male, Middle Aged, Observer Variation, Positron-Emission Tomography, Radiopharmaceuticals, Reproducibility of Results, Sensitivity and Specificity, Stroke Volume, Ventricular Dysfunction, Left.
user
Is impaired Myocardial Sympathetic Innervation Associated with Diastolic Dysfunction in Patients with Heart Failure with Preserved Ejection Fraction : 11C-hydroxyephedrine PET Study? Context: Diastolic dysfunction is important in the pathophysiology of heart failure with preserved ejection fraction (HFpEF). Sympathetic nervous hyperactivity may contribute to the development of diastolic dysfunction. The aim of this study was to determine the relationship between myocardial sympathetic innervation quantified by  Forty-one HFpEF patients having an echocardiographic left ventricular ejection fraction ≥ 40% and 12 age-matched volunteers without heart failure underwent the echocardiographic examination and  Grade 2 to 3 diastolic dysfunction (DD
assistant
Myocardial sympathetic innervation was impaired in HFpEF patients and was associated with the presence of advanced diastolic dysfunction in HFpEF. Final Decision: yes