Hypertrophic cardiomyopathy (HCM) is defined by the presence of increased ventricular wall thickness or mass in the absence of loading conditions (hypertension, valve disease) sufficient to cause the observed abnormality.

Impaired feeding performance of an infant as manifested by difficulties such as weak and ineffective sucking, brief bursts of sucking, and falling asleep during sucking. There may be difficulties with chewing or maintaining attention.

A type of hearing impairment in one or both ears related to an abnormal functionality of the cochlear nerve.

A profound delay in the achievement of motor or mental milestones in the domains of development of a child.

Neurodevelopmental delay (NDD) refers to delays in the maturation of the brain and central nervous system; infants and young children with NDD may experience delays in the development of one or more skills including gross motor abilities, fine-motor coordination, language abilities and ability to solve increasingly complex problems.

A condition in which there is increased muscle tone so that arms or legs, for example, are stiff and difficult to move.

The presence of skeletal muscular atrophy (which is also known as amyotrophy).

Muscular hypotonia (abnormally low muscle tone) affecting the musculature of the trunk.

Lack of breathing with no movement of the respiratory muscles and no exchange of air in the lungs. This term refers to a disposition to have recurrent episodes of apnea rather than to a single event.

A position of the fetus at delivery in which the fetus enters the birth canal with the buttocks or feet first.

Delivery of a fetus through surgical incisions made through the abdominal wall (laparotomy) and the uterine wall (hysterotomy).

A nonspecific term denoting degeneration of the retinal pigment epithelium and/or retinal photoreceptor cells.