A subjective feeling of tiredness characterized by a lack of energy and motivation.

A functional motor deficit where individuals whose responses to the challenges of exercise fail to achieve levels considered normal for their age and gender.

A type of knee joint contracture in which the knee is in a fixed bent (flexed) configuration such that it cannot be straightened actively or passively.

Impaired ability to eat related to problems gathering food and getting ready to suck, chew, or swallow it.

Meconium ileus refers to intestinal obstruction due to inspissated meconium in the distal ileum and cecum, which develops in utero and presents shortly after birth as a failure to pass meconium (summary by Romi et al., 2012). Meconium ileus is a known clinical manifestation of cystic fibrosis (CF; 219700), and meconium ileus in the absence of CF is a rare phenomenon (summary by Tal et al., 1985).

The term gait disturbance can refer to any disruption of the ability to walk.

Increased susceptibility to fatigue.

A brighter than expected signal on magnetic resonance imaging emanating from the cerebral white matter.

A type of weakness of skeletal muscle that occurs after a muscle group is used and lessens if the muscle group has some rest. That is, there is diminution of strength with repetitive muscle actions.

Hypotonia is an abnormally low muscle tone (the amount of tension or resistance to movement in a muscle). Even when relaxed, muscles have a continuous and passive partial contraction which provides some resistance to passive stretching. Hypotonia thus manifests as diminished resistance to passive stretching. Hypotonia is not the same as muscle weakness, although the two conditions can co-exist.

Reduced strength of one or more muscles innervated by the facial nerve (the seventh cranial nerve).

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.

Impairment of gas exchange within the lungs secondary to a disease process, neoplasm, or trauma, possibly resulting in hypoxia, hypercarbia, or both, but not requiring intubation or mechanical ventilation. Patients are normally managed with pharmaceutical therapy, supplemental oxygen, or both.

Bluish discoloration of the skin and mucosa due to poor circulation or inadequate oxygenation of arterial or capillary blood.

The upper eyelid margin is positioned 3 mm or more lower than usual and covers the superior portion of the iris (objective); or, the upper lid margin obscures at least part of the pupil (subjective).

Paralysis of one or more extraocular muscles that are responsible for eye movements.

Nystagmus consisting of horizontal to-and-fro eye movements.