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Genetic and Developmental Disorders
Lecture 3 part 2
153
Pathology
Graduate
06/19/2014

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Term
How many pairs of chromosomes are there for humans?
Definition
23
Term
How many pairs of chromosomes code for sex?
Definition
1
Term
What are the bands on chromosomes?
Definition
genes
Term
What are genes?
Definition
regions of DNA that controls hereditary characteristics
Term
How do many congenital and chromosomal disorders occur?
Definition
mutations
Term
When do mutations tend to occur?
Definition
mitosis and meiosis
Term
What are causes for mutations?
Definition
unknown, teratogen
Term
What is mitosis?
Definition
replication of body cells
Term
What is meiosis?
Definition
replication of sex cells
Term
What is a medical condition that is present at birth?
Definition
congenital disorder
Term
When can a congenital disorder be recognized?
Definition
prenatally, at birth, or years later
Term
What are congenital disorders the result of?
Definition
genetic abnormalities, intrauterine environement, a mixture of both, or unknown factors
Term
What are genetic and chromosomal disorders a result of?
Definition
single-gene trait, chromosomal defect, or both
Term
What distinguishes minor or severe genetic/chromosomal disorders?
Definition
number of systems effected
Term
What is an example of a severe genetic/chromsomal disorder?
Definition
cystic fibrosis
Term
What is an example of a minor genetic/chromosomal defect?
Definition
color blindness
Term
What are the organs affected by cystic fibrosis?
Definition
sinuses, lungs, skin, liver, pancreas, intenstines, reproductive organs
Term
How are the sinuses affected by cystic fibrosis?
Definition
sinusitis (infection)
Term
How are the lungs affected by CF?
Definition
thick, sticky mucus build up, bacterial infection, widened airways, blood in mucus
Term
How is the liver affected by CF?
Definition
blocked billary ducts
Term
How is the skin affected by CF?
Definition
sweat glands produce salty sweat
Term
How is the pancreas affected by CF?
Definition
blocked pancreatic cells
Term
How are the intestines affected by CF?
Definition
cannot fully absorb nutrients
Term
How are the reproductive organs affected by CF?
Definition
complications
Term
How do chromosomal defects arise?
Definition
often from error in meiosis
Term
What error takes place during meiosis to cause chromosomal defects?
Definition
DNA fragments are displaced or lost
Term
What happens as a result of DNA fragments being lost or displaced?
Definition
altered genetic function
Term
What is the leading cause of spontaneous abortions?
Definition
chromosomal defects
Term
What is an example of a chromosomal defect?
Definition
down's syndrome
Term
What are developmental disorders attributed to?
Definition
problems during labor/delivery, teratogen exposure in utero
Term
When are diagnostic tools recommended?
Definition
family history of hereditary disease, high risk pregnancies
Term
What are some diagnostic tools?
Definition
blood tests, ultra sound, amniocentesis
Term
What is the role of blood tests?
Definition
detect abnormal substance in the blood stream
Term
What is the role of ultrasound?
Definition
visualize the fetus
Term
What is the role of amniocentesis?
Definition
analyze amniotic fluid
Term
When is blood drawn for a blood test?
Definition
between 15-22 weeks of pregnancy
Term
What is Trisomy 21
Definition
Down's Syndrome
Term
What does trisomy mean?
Definition
3 chromosomes present
Term
What is hypotonia?
Definition
poor tone
Term
What are the characteristics for trisomy 21/ down's syndrome?
Definition
hypotonia, cognitive delay, abnormal facial features
Term
What is the etiology for down's syndrome?
Definition
faulty meiosis
Term
What are the possible causes for the faulty meiosis associated with down's syndrome?
Definition
advanced age of mother, deterioration of oocyte, environmental factors
Term
Where is the extra chromosome located with Down's Syndrome?
Definition
21
Term
What facial features are associated with Down's Syndrome?
Definition
flattened nose and face, upward slanting eyes, protruding tongue, short limbs, widely spaced eyes
Term
What are the characteristics of the hands associated with Down's Syndrome?
Definition
single palmer crease, short 5th finger that curves inward
Term
What are the characteristics of the feet associated with Down's syndrome?
Definition
widely separated first and 2nd toes, increased skin creases
Term
What is trisomy 13
Definition
patau syndrome
Term
What is trisomy 18
Definition
edward's syndrome
Term
What chromosome is associated with Patau syndrome?
Definition
13
Term
What chromosome is associated with Edward's syndrome?
Definition
18
Term
What are other non-visible manifestations associated with Down's Syndrome?
Definition
common ear infections, thyroid disfunction, delayed motor skills, cardiac anomalies, joint laxity, scoliosis, GI anomalies
Term
Persons with Down's have higher incidences of what?
Definition
atlantoaxial instability, obesity, diabetes, CV disease, osteoarthritis, osteoporosis
Term
What is atlantoaxial instablitity?
Definition
Instablity of the C1 and C2 vertebra
Term
Why is atlantoaxial instability dangerous?
Definition
increased risk for injury and death
Term
What is Atlantoaxial instability caused by?
Definition
ligamentous laxity/defect
Term
How is atlantoaxial instability assessed for?
Definition
open mouth xrays
Term
What is the major PTI for Down's Syndrome?
Definition
caution due to joint laxity, particularly of AA joint
Term
AA joint
Definition
atlantoaxial joint
Term
Joint laxity aside, what should the Therapist focus on?
Definition
gross and fine motor movements
Term
How should the therapist deal with the potential for obesity, diabetes, and CV disorders in those with Down Syndrome?
Definition
encourage active lifestyle, discourse sedentary behaviors
Term
When designing and implementing PT plan of care what should the therapist consider when working with those with Down Syndrome?
Definition
safety and low cognitive level
Term
What is scoliosis?
Definition
abnormal lateral curvature of the spine
Term
What does idiopathic mean?
Definition
unknown
Term
How is scoliosis caused?
Definition
most cases idiopathic
Term
For known cases of scoliosis, what can be potential causes?
Definition
osteopathic, myopathic, neuropathic
Term
How is osteopathic scoliosis caused?
Definition
due to a bony abnormality
Term
How is myopathic scoliosis caused?
Definition
muscle imbalance
Term
How is neuropathic scoliosis caused?
Definition
nervous system dysfunction
Term
What are signs of scoliosis?
Definition
uneven shoulders, uneven hips, curve in spine
Term
What are the two types of scoliosis?
Definition
functional vs structural
Term
What is functional scoliosis?
Definition
caused by factors other than vertebral malalignment
Term
What is an example of functional scoliosis?
Definition
poor posture
Term
If a functional scoliosis is left untreated
Definition
may become structural scoliosis
Term
How is functional scoliosis treated?
Definition
remove/correct the causative factor
Term
What is LLD?
Definition
leg length discrepancy
Term
What causes congential scoliosis?
Definition
abnormal embryologic development
Term
How is structural scoliosis caused?
Definition
spinal asymmetry in the ligaments of the spine, rotation of spine, misshapen vertebrae
Term
What determines the severity of teh resultant impairments with scoliosis?
Definition
angle of curvature
Term
What is considered a mild case of scoliosis?
Definition
<20 degree Cobb's angle
Term
What is a severe case of scoliosis?
Definition
>60 degree's Cobb's angle
Term
What is probable in severe cases of scoliosis?
Definition
difficulty with visceral function, back pain
Term
If visceral function is compromised due to scoliosis, what device is used for corrective surgery?
Definition
harrington rods
Term
What are the role of the Harrington rods?
Definition
halt progression of curvature, correct deformity, improve alignment, prevent pulmonary complications, reduce pain
Term
What is the role of the therapist with scoliosis?
Definition
screening
Term
What therapist interventions are associated with scoliosis?
Definition
brace, splinting, exercise prescription, E-stim
Term
The efficacy of e-stim for the management of scoliosis is...
Definition
questionable
Term
When is bracing used in children with scoliosis?
Definition
cobb angle <25 degrees
Term
Spinal orthoses have been proven _______ in reducing spinal asymmetery
Definition
effective
Term
What is spina bifida?
Definition
neural tube defect that occurs at any level of the spine
Term
Where does spina bifida usually manifest?
Definition
lumbosacral region
Term
What is the defect associated with Spina Bifida?
Definition
incomplete closure of the neural tube
Term
WHen does the embryo's neural tube close?
Definition
by the 26th day after conception
Term
What does the top of the neural tube become?
Definition
the fetus' brain
Term
What does the rest of the neural tube become?
Definition
the spinal cord
Term
What defects occur as a result of spina bifida?
Definition
spinal cord and bones that make up the backbone
Term
What is the etiology for spina bifida?
Definition
multifactorial, seems to depend on genetic predisposition, teratogens, folic acid levels
Term
What nutrient has reduced the incidence of spina bifida?
Definition
folic acid
Term
What is the natural form of folic acid?
Definition
folate
Term
When should folic acid levels be highest?
Definition
Before the 26th day of pregnancy
Term
NTD
Definition
neural tube defect
Term
Parents who have a child with a NTD have a ________ chance of subsequent children having NTD
Definition
higher
Term
Parents who are diabetic have a _______ risk of having a child with NTD
Definition
higher
Term
How is the severity of Spina bifida determined?
Definition
level of teh lesion and what neural structures are involved
Term
What are the most common effects of spina bifida?
Definition
motor involvement of teh lower limbs, trunk, resultant muscle imbalances
Term
Muscle imbalances as a result of spina bifida can lead to
Definition
deformity
Term
What deformity can be a result of teh muscle imbalances as a result of spina bifida?
Definition
scoliosis
Term
Occulta
Definition
hidden
Term
What features are associated with Spina Bifida occulta?
Definition
Dorsum of teh back has a depression or tuft of hair over the level of the NTD
Term
What are common problems associated with Spina Bifida occulta
Definition
motor weakness of distal legs (Feet), bowel and bladder dysfunction
Term
Is neurologic involvment common with spina bifida occulta?
Definition
no
Term
Aperta
Definition
open
Term
Spina Bifida _______ has a visible sac seen on the skin at the level of the NTD
Definition
aperta
Term
What are the two types of Spina Bifida aperta?
Definition
meningocele, myelomeningocele
Term
Myelo
Definition
spinal cord
Term
meningo
Definition
meninges
Term
cele
Definition
fluid filled sac
Term
Does a meningocele result in a neurologic invovlement?
Definition
rarely
Term
What does the protruding sac of teh meningocele filled with?
Definition
spinal fluid and meninges, covered by skin
Term
IS there spinal cord involvement with meningoceles?
Definition
no
Term
Myelomeningcocele's are filled with what?
Definition
meninges, spinal fluid, spinal cord
Term
Myelomeningocele's may also have this structure depending upon the level of the lesion
Definition
cauda equina
Term
What are the problems associated with a myelomeningocele?
Definition
tonal changes, bowel bladder dysfunction, musculoskeletal deformities, hydrocephalus, abnormal righting reflexes, potential mental retardation
Term
What musculoskeletal deformites are associated with myelomeningoceles?
Definition
club feet, hip dysplasia
Term
What is hydrocephalus
Definition
excessive accumulation of CSF in the brain
Term
What happens as a result of CSF accumulation in the brain?
Definition
dilation of the ventricles of the brain
Term
Potentially harmful pressure on the tissues of the brain is a result of what?
Definition
ventricular dilation
Term
What is the Arnold Chiari malformation?
Definition
cerebellar portion of the brain herniates, or protrudes into the psinal canal
Term
What is Arnold Chiari malformation associated with?
Definition
hydrocephally
Term
What is a potential danger of Arnold Chiari malformation?
Definition
brain pushes onto cranial nerves
Term
What does the myelomeningocele have that the meningocele does not?
Definition
presence of the spinal cord
Term
Spina Bifida: The therapist should focus on
Definition
PROM, gentle strengthening, asssessing motor function and sensation, functional training
Term
Spina Bifida: The therapist should focus on
Definition
education, prevention of secondary complications
Term
What secondary complications are associated with spina bifida?
Definition
skin breakdown, shunt malfunctions
Term
Spina Bifida: What should the therapist focus on?
Definition
bracing, adpative equipemnt, assistive devices
Term
DDH
Definition
developmental dysplasia of the hip
Term
When may DDH occur?
Definition
in utero, first year of life
Term
The hips may be, _____, ______, or _____ due to DDH
Definition
unstable, subluxed, completely dislocated
Term
DDH: unstable hips
Definition
easily dislocated with manipulation
Term
DDH: subluxed hips
Definition
partially displaced
Term
DDH: completely dislocated
Definition
femoral head does not articualte with acetabulum
Term
What causes DDH?
Definition
hormonal or hereditary laxity of ligaments surrounding the hip joints
Term
What else can DDH be caused by?
Definition
prenatal or post natal positioning
Term
What hip position decreases risk of DDH?
Definition
flexed, abducted, and externally rotated
Term
What increases risk for DDH
Definition
swaddling
Term
Clinical picture: non-walkers
Definition
asymmertrical ROM, anatomical landmarks, extra thigh skin folds, LLD
Term
Clinical picture: walkers
Definition
antalgic, waddling, or tendelenberg gait
Term
DDH: pre-op pt interventions:
Definition
education regarding best positining and handling of baby, strenthening exercises
Term
DDH: post-op PT interventions:
Definition
cast and orthotic care
Term
What is the Pavlik harness used for?
Definition
pre-op bracing
Term
When is surgery for DDH potentially necessary?
Definition
conservative measures fail, diagnosis after 2 years of age
Term
WHat does the surgery for DDH do?
Definition
reduces the dislocation
Term
Following surgery, what is put on the baby to hold the hips in place?
Definition
spica cast
Term
How long is the spica cast worn for post surgery?
Definition
3-6 months
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