123I-mIBG	123I-meta-iodobenzylguanidine
ACE-I	angiotensin-converting enzyme inhibitors
ACS	acute coronary syndrome
ARB	angiotensin receptor blockers
ARNI	angiotensin-receptor neprilysine-inhibitor
BNP	brain natriuretic peptide
β-AR	β-adrenergic receptors
CHF	chronic heart failure
CZT	Cadmium–Zinc–Telluride
FBBG	Flubrobenguane
ICD	implantable cardioverter defibrillator
HED	hydroxyephedrine
HFPEF	heart failure with preserved ejection fraction
HFREF	heart failure with reduced ejection fraction
HRV	heart rate variability
H/M	heart-to-mediastinum ratio
LBBB	left bundle branch block
LVEF	left ventricular ejection fraction
LVESV	left ventricular end systolic volume
MAO	monoamine oxidase
MPI	myocardial perfusion imaging
NE	norepinephrine
NET	norepinephrine transporter
NYHA	New York heart association
OMT	optimal medical therapy
ROI	region-of-interest
SCD	sudden cardiac death
SDS	summed defect score
SGLT2 inhibitor	sodium-glucose cotransporter-2 inhibitor
SPECT	single-photon emission tomography
TCM	takotsubo cardiomyopathy
WO	washout