Syndromes and Disorders Flashcards
(159 cards)
Prader-Willi Syndrome Definition
rare genetic disorder in which the paternal genes on chromosome 15 are deleted or unexpressed resulting in a # of physical, mental, and behavioral problems
in infancy, super low tone and not interested in feeding
as children, they face obesity because they’re insatiable
Prevalence of Prader-Willi Syndrome
1 out of 10,000 to 15,000 live births diagnosed with it
Impacts more than 400,000 worldwide
Boys and girls affected equally
Clinical Features of Prader-Willi Syndrome in Infancy
Hypotonia Distinct facial features: almond-shaped eyes Thin upper lip/downturned Head narrowing at temples FTT only in infancy Lack of eye coordination Poor responsiveness
FTT
failure to thrive
Clinical Features of Prader-Willi Syndrome in Childhood
Excessive food craving
Weight gain (especially in the trunk region)
Hypogonadism (little to no hormones produced by sex glands)
Poor growth: small stature, hands/feet
Mild to moderate learning disabilities
Delayed motor development
Speech problems
Behavior problems
Sleep disorders (apnea)-related to obesity
Early FTT may cause other disorders
Hypotonic (inactivity)
Specific Speech and Language Deficits of Prader-Willi Syndrome
Speech sound errors (attributed somewhat to hypotonicity)
Hypernasality (hypotonia: inadequate closure)
Flat intonation
Imprecise articulation
Slow speaking related
Abnormal pitch
Treatment & Care of Prader-Willi Syndrome
Nutrition & diet modification
Growth hormone treatment
Sex hormone treatment
Therapies: PT, OT, ST, Developmental therapy, nutrition, mental health therapy
Environmental modifications: keep food hidden/out of sight
Speech Considerations in Prader-Willi Syndrome
SLP will address speech/language issues in child with this
SLP will address feeding concerns in infancy
Prognosis for Prader-Willi Syndrome
No cure
Most will require specialized care & supervision throughout lives (long-term prognosis often b/c of feeding issues)
Most adults will reside in residential care facility so eating habits can be monitored
Biggest health risks are complications from obesity
Therapy at home & school will be needed to address cognitive delays, communication, & behavioral delays
Dandy Walker Malformation
Characterized by a hypoplastic or missing cerebellar vermis, enlarged 4th ventricle, & cyst of the posterior fossa
Prevalence of Dandy Walker Malformation
Estimated to occur in >1 in 25,000 live births; most common congenital malformation of the cerebellum
Mortality rates have decreased over time with medical advances
Current estimates suggest 27% of individuals with it die early
Prognosis in Dandy Walker Malformation
Overall, considered to be good & hopeful for those that survive
Best factor is absence of other congenital defects
Associated Problems of DW Malformation
Hydrocephalus, seizures, polycystic kidneys, cardiac anomalies, limb & facial abnormalities, headaches from hydrocephalus
Symptoms of increased intracranial pressure: lethargy, emesis, irritability
Frequent associated symptoms of DW Malformation
Other CNS abnormalities/disorders may co-occur, decreased intelligence, unsteady gait, nystagmus, lack of coordination
Occasional associated symptoms of DW Malformation
Vision problems, hearing problems, cleft lip/palate
Treatment & Management of DW Malformation
Early treatment includes removing membranes of posterior fossa (high mortality rates)
Surgical management currently include shunting 4th ventricle to drain excess CSF buildup (caused by cyst formation)
Anticonvulsive therapy or medication commonly needed
Variable sx’s treated as needed by PT, OT, ST, etc.
Most common anticonvulsant used in tx of DW malformation
phenobarbital
Polycystic kidneys
numerous fluid-filled pockets/cysts resulting in massive enlargement of kidneys
What is Fragile X Syndrome?
X-linked condition caused by a mutation FMR1 gene on the X chromosome; Usually inherited from the mother who is a carrier of the condition
Fragile X Inheritance
Complicated; FMR1 mutation involves involves a region of repeating DNA bases on the gene
FMR1 gene with 55-199 repeats is said to have…
a premutation; premutations passed down in an egg may or may not develop into a full mutation
FMR1 gene with 200 or more repeats is said to have…
a full mutation
Prevalence of Fragile X Syndrome
1 of the most common genetic disorders
1 in 4000 boys; 1 in 6000 girls
Name Fragile X comes from:
broken or fragile appearance of the X chromosome