👉 Metacrasis is a term used in medicine to describe a type of heart defect. It occurs when the left ventricle (the "heart's pumping chamber") does not fill with blood, causing it to become too small and weak. This condition can lead to complications such as pulmonary hypertension, which raises the pressure in the lungs, or aneurysms, which are ruptured blood vessels. The symptoms of metacrasis may include shortness of breath, chest pain, and a feeling