Syndromes Flashcards
(158 cards)
Prader-Willi Syndrome
- A rare genetic disorder in which the paternal (father) genes on chromosome 15 are deleted or unexpressed resulting in a number of physical, mental, and behavioral problems.
- Very hard to get them to feed. Very low tone and floppy. As children they face obesity- always want to eat (but the opposite in infants)
Prader-Willi Syndrome Prevalence
- 1 out of 10,000 to 15,000 live births are diagnosed with Prader-Willi
- Impacts more than 400,000 worldwide
- Boys and girls are impacted equally
Prader-Willi Syndrome History
- First described in 1956 at the University of Zurich
- Pediatricians Andrea Prader and Heinrich Willi of Switzerland were first to describe
- First case of PWS in the US was diagnosed in 1960
Prader-Willi Syndrome in infancy
- Hypotonia
- Distinct facial features: almond-shaped eyes
- Thin upper lip/downturned
- Head narrowing at temples
- FTT-failure to thrive-only in infancy, not the case in later years
- Lack of eye coordination
- Poor responsiveness
Prader-Willi Syndrome in childhood
- Excessive food craving
- Weight gain (especially in trunk region)
- Hypogonadism- sex glands produce little to no hormones (low muscle and growth in boys)
- Poor growth: small stature hands/feet
- Learning disabilities (mild to moderate)
- Delayed motor development- probably due to hypotonic
- Speech problems
- Behavior problems
- Sleep disorders (Apnea)-most likely due to obesity
**Patients struggle intellectually because of insatiable hunger
Specific Speech and Language Deficits PWS
- Speech sound errors- due to poor tongue position
- Hypernasality-hypotoncity affects VP closure
- Flat intonation
- Imprecise articulation
- Slow speaking rate
- Abnormal pitch
Diagnosis of PWS
- MD may diagnose PWS based on clinical systems
- Genetic testing is used to confirm Dx by identifying chromosomal abnormalities that are characteristic of PWS
- Preferred method is a methylation analysis (detects>99% of cases)
- 2nd method is FISH
Treatment and Care of PWS
- Nutrition and diet modification
- Growth hormone treatment
- Sex hormone treatment
- Therapies: Physical Therapy, Speech Therapy, Occupational Therapy, Developmental Therapy, Nutrition, Mental Health Therapy
- Environmental modification- keep food out of site, maybe change location, and visual cues
PWS and Speech
- SLP will address speech and language issues in the child with PWS
- SLP will address feeding concerns in infancy
Prognosis for PWS
- There is no cure for PWS- long term prognosis
- Most will require specialized care and supervision throughout their lives
- 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, and behavioral delays
- Swimming is recommended by OT, it’s repetitive, easy on the joints
Dandy Walker Malformation (DWM)
-DW malformation is characterized by a hypoplastic or missing cerebellar vermis, enlarged 4th ventricle, and cyst of the posterior fossa
DWM Prevalence/Prognosis
- DWM is estimated to occur in greater than 1 in 25,000 live births. It is the most common congenital malformation of the cerebellum
- Mortality rates have decreased over time with medical advances
- Current estimates suggest 27% of individuals with DWM die early
- Overall prognosis is considered to be good and hopeful for those that survive
- Best prognostic factor is absence of other congenital defects
DWM history
- First described by Sutton in 1887 who was performing an autopsy on an infant
- Dandy & Blackfan (1914), Dandy (1921) and Taggert and Walker (1942) contributed to classification of DWM by recognizing that there was a blockage of the 4th ventricle which often coincides with hydrocephalus
- Dandy-Walker was appointed the name for the disorder in 1954
Associated problems of DWM
- Hydrocephalus- headaches, and could impact eating
- Seizures
- Polycystic Kidneys- fluid in the kidney’s which causes enlargement
- Cardiac Anomalies
- Limb and facial abnormalities
- Symptoms of increased intracranial pressure
- ———Lethargy, emesis, irritability
Associated symptoms of DWM (frequent)
Think Cerebellar symptoms
Frequent:
- Other CNS abnormalities/disorders may co-occur
- Decreased intelligence
- Unsteady gait
- Nystagmus- fast uncontrollable eye movement
- Lack of coordination
Associated symptoms of DWM (occasional)
Occasional:
- Vision Problems
- Hearing Problems
- Cleft lip/palate
DWM Diagnosis
- Diagnosis can be performed prenatally using ultrasonoghrapy after 18 weeks gestation
- Postnatal diagnosis and differentiation from similar disorders is performed using MRI’s, CT scans, and angiographies
DWM Treatment/Management
- Early treatment included removing the membranes of the posterior fossa (high mortality rates)
- Surgical management of DWM currently includes shunting of the 4th ventricle to drain excess CSF buildup (caused by cyst formation)
- Anticonvulsive therapy or medication is commonly needed- (phenobarbatol-anticonvulsive drugs) drugs like these makes development harder
- Variable symptoms are treated as needed by (including PT, OT, ST)
Fragile X
- Fragile X Syndrome is an X-linked condition caused by a mutation on the FMR1 gene on the X chromosome. It is usually inherited from a mother who is a carrier of the condition.
- Fragile X inheritance is complicated. The FMR1 mutation involves a region of repeating DNA bases on the gene. A FMR1 gene with 55-199 repeats is said to have a “premutation” and a gene with 200 or more repeats is said to have a “full mutation.”
- Premutations passed on in an egg may or may not develop into full mutations.
Prevalence of Fragile X
- Fragile X is one of the most common genetic disorders
- 1 in 4000 males
- 1 in 6000 females
History of Fragile X
1943, Martin and Bell discovered that a particular form of intellectual disability was X linked
In 1969, Herbert Lubs developed the chromosomal test for Fragile X
In 1991 the FMR1 gene that causes Fragile X was identified
The name Fragile X comes from the broken or fragile appears of the X chromosome
Clinical Features of Fragile X (1)
- Delay in crawling, walking, or rotating
- Hand clapping or hand biting
- Hyperactive or impulsive behavior
- Anxiety and unstable mood
- Intellectual disability
- Speech and Language Delay
- Tendency to avoid eye contact
You don’t want to do a form of therapy that causes kids with fragile x or autism to make consistent eye contact because its over stimulating for them. Early in infancy, development is driven by vision so if this is impaired, so is development
Clinical Features of Fragile X (2)
- Autistic Behavior
- Sensory Integration Problems
- Gastro-esophageal Reflux
- Recurrent Otitis Media
- Seizures affect about 25% of people with Fragile X
- Flat Feet
- Flexible Joints
Clinical Features of Fragile X (3)
- Low muscle tone- explains reflux
- Large body size
- High arched palate
- Scoliosis
- Large testicles
- Large forehead