Etymology: Gk, kardia, heart, a, without, sthenos, strength
a form of neurasthenia in which cardiovascular symptoms are prominent.
orthostatic intoleranceA condition (OMIM:604715) characterised by lightheadedness, fatigue, altered mentation, syncope and tachycardia upon assuming an upright position, and markedly elevated serum norepinephrine.
Defects in SLC6A2, which encodes a member of the sodium:neurotransmitter symporter that regulates norepinephrine homeostasis, are a cause of orthostatic intolerance.
cardiasthenia(kăr″dē-ăs-thē′nē-ă) [″ + astheneia, weakness]
An obsolete term for a somatization disorder with prominent cardiac symptoms.