In its classic definition, by FranÃ§ois-Louis Ganshof (1944), feudalism describes a set of reciprocal legal and military obligations among the warrior nobility revolving around the three key concepts of lords, vassals and fiefs.
The exact cause of intracardiac echogenic foci remains unclear; however, they appear to be caused by small deposits of calcium in the papillary muscle of the fetal heart.
Heart Causes: Heart conditions that can cause syncope or fainting due to temporary loss of consciousness include: 1  Abnormal heart rhythms (heart beating too fast or too slow). 2  Abnormalities of the heart valves (pulmonic valve stenosis). 3  Widespread disease of the heart muscle (cardiomyopathy).