History
In the infantile classic subtype form, the caregiver may report feeding difficulties and difficulty breathing. [10] The child may also have an enlarged tongue and poor muscle tone.
In the infantile non-classic subtype form, delayed motor skills such as rolling over and sitting up may be reported.
In the adult form, the patient may report progressive limb-girdle weakness, with the pelvic muscle more affected than the scapulohumeral group.The patient may also report early tiredness and fatigue, along with sleep-disordered breathing.
Physical Examination
1. Infantile onset - Classic subtype: This type presents within a few months after birth and is characterized by the following:
Neuromuscular manifestations
-
Hypotonia since birth
-
Hyporeflexia/areflexia
-
Muscle weakness
-
Contractures and joint deformities, such as lordosis and scoliosis, can occur because of compensatory movement patterns due to extensive weakness and limited mobility
Respiratory system
-
Respiratory muscle weakness can cause repeated episodes of pneumonia and upper respiratory tract infection
-
Respiratory insufficiency leads to early morbidity and mortality
Cardiovascular system
-
Hypertrophic cardiomyopathy
-
Congestive heart failure
-
Conduction disorders
Gastrointestinal and nutritional manifestations
-
Macroglossia
-
Difficulty in sucking due to facial hypotonia, oral motor weakness, and macroglossia; this can affect growth and weight gain
-
Hepatomegaly
-
Splenomegaly
2. Infantile onset - Non-classic subtype: This type usually presents within the first year of life and is less severe compared with the classic subtype; it is characterized by the following:
-
Delayed motor skills, such as sitting up and rolling over
-
Progressive muscle weakness
-
Cardiomegaly - Less likely compared with the classic subtype
-
Respiratory insufficiency
3. Adult onset: This type is characterized by the following:
Musculoskeletal system
-
Progressive limb-girdle weakness followed by diaphragm and accessory respiratory muscles
-
Hyporeflexia
-
Gait disturbances
-
Myalgia and cramps
-
Amyotrophy
-
Fatigue and tiredness - Exercise intolerance
Respiratory system
-
Dsypnea on exertion
-
Orthopnea
-
Sleep-disordered breathing
-
Sleep apnea
-
Weak cough
-
Frequent respiratory tract infections
Additional features
-
Dysphagia
-
Difficulty in chewing
-
Weight loss
-
Subarachnoid hemorrhage - Especially in the basilar artery
-
Glycogen storage disease, type II. Metabolic pathways of carbohydrates.