Cytomegalovirus

Cytomegalovirus:

• Belongs to the _______ virus family

• Exposure increases with age

==Transmission of CMV occurs when coming into contact with the virus through:==

• _______

• Blood

• _______

• Breast milk

• _______ _______

• Semen

In the US ~ ___% of children 6-11 years old are CMV+

By 80 years old seropositivity increases to ___%

Most healthy children and adults infected with CMV will have ___ symptoms or might develop only a ______ mononucleosis-like illness

Once infected with CMV:

• Virus can _________, but healthy immune system prevents this in most cases

• A _________ carrier can transmit virus to fetus which causes developmental issues in infant.

  • Acute symptoms at birth

  • Permanent disabilities

  • Both

Diagnosis of Congenital CMV:

either _________ through amniocenteses OR in the _________ period for from direct assessment of the infant in the postnatal period.

Testing for congenital CMV must be completed in ____ days from birth otherwise it is IMPOSSIBLE to distinguish congenital from acquired.

• A test offered during pregnancy to check if a baby has a genetic or chromosomal condition.

• It involves removing and testing a small sample of cells from amnioticfluid (the fluid that surrounds the baby in the womb)

___ is the most common intrauterine infection in the US with ~ __% of pregnant women being symptomatic (like mononucleosis)

_________ = 0.64-.70% of live births

_________ = 0.2 to 2.2% (congenital) with estimated 0.5 to 1.0 newborns infected in the prenatal period

• Generalized petechiae

• Hyperbilirubinemia

• Hepatosplenomegaly

• Purpuric rash (3-10mm)

• Microcephaly

• Seizures

• Focal or general neurologic deficits

• Retinitis

• Intracranial calcifications

CMV Symptoms:

Fat Hairless Gumbo SHRIMP

(FHGSHRIMP)

Most aka ___ to ____% of infants w/ congenital CMV will NOT have any clinically significants apparent symptoms at birth.

Are newborns screened from CMV in the US?

It is possible to ID children with CMV by obtaining a newborn _________ _________ for analysis

Typically diagnosed through detection within _________ or _________ within the first 3 weeks of life (21 days)

What would lead to testing at birth?

Utah, Illinois, Connecticut, Iowa, New York, and Virginia participates in a screening for cCMV following a _________ _________

Any abnormal condition that follows and is the result of a disease, treatment, or injury, such as paralysis after poliomyelitis, deafness after treatment with an ototoxic drug, or scar formation after a laceration

Both symptomatic and asymptomatic infants may later develop _________.

• More severe and frequent in the symptomatic infants.

• SNHL

• Retinitis

• Mental Retardation

• Microcephaly

• Seizure

• Cerebral palsy

SNHL is most common sequela of cCMV

__% to __%

HL occurs in __% to __% of children with symptoms at birth

HL occurs in in __% to __% of children who are asymptomatic at birth

• No predictable audiometric configuration

  • _________ to _________

• Laterality: Unilateral or bilateral

• Some involve 4-8k Hz only - others all frequencies are involved

• HL may be _________ and/or _________

  • Develop within the first years for some

~ __% of the cases of CMV related HL are late-onset/and/or progressive.

(Not always detected at birth…. ~7% of cCMV cases were detected)

Recent estimates:

• __% of Hl at birth is cCMV related

• Late onset HL = __% of HL in children by age 4 likely CMV related.

  (Suggest that CMV is the leading non genetic cause of HL in Peds for the US)

Animal and human studies on temporal bone suggest:

• CMV may be present in the epithelium and neural cells of the inner ear.

• Cause U__amage by virus-mediated damage to neural cells and/or cause inflammatory responses resulting in damage__ to the auditory apparatus therefore causing HL

• Doesn’t explain late onset or progressive loss!!!

JCIH treatment:

• Babies ID’s early need impediment and more frequent _________ _________ to allow close monitoring

• _________ in hearing should be considered in treating the HL

  • May program HAs more often.

• Communication methods/needs to accommodate a changing HL

CDC recommendations:

• _________ hearing checks

• routine _________ screening

• Developmental milestone checks

• Infectious disease specialists

• Otolaryngology

• Neurology

• Primary care/Pediatrician

• Audiology

• Opthamology

(Dahle et al., 2000)

Longitudinal study (24 years)

860 children with CMV were studied                   (651 asymptomatic, 209 symptomatic)

Test battery:

• ABR (chloral hydrate)

• Air and bone conduction if AC>25 dBnHL

• Tympanometry

• VRA (from 9 months to 3 years old)

Longitudinal study outcomes:

• Bilateral moderate to severe SNHL                       (equally severe in asymptomatic patients)

• Delay onset of hearing loss                                    (wide age range: 6 months to 16.4 years)

• Gradually progressive                                            (sometimes sudden decreases reaversed w/ steroids)

• Threshold fluctuations without progression of their loss (may experience improvement)

• Low frequencies (250 and 500 Hz) less stable than higher frequencies

Audiometric pattern:

• _________ hearing loss was the predominant threshold configuration

• Initially by a sloping _________-frequency loss may gradually progress to include the lower frequencies

• Upward sloping (symptomatic)

• Downward sloping (asymptomatic)

upward sloping

downward sloping

Medical management/evaluation:

• A general medical examination

• _________ procedures to document the diagnosis of CMV

• An examination to determine damage to the _________ (EEG)

• Assessment of the child’s _________ and _________.

Medical management

Prolonged _________ _________ for cCMV with SNHL showed improvement (58-79%) in hearing status and no deterioration in unaffected ears at baseline.

Ganciclovir

(inhibitor of viral DNA synthesis) antiviral drug may have a beneficial effect in newborns affected by severe congenital CMV infection such as preventing hearing deterioration

• Maintained normal hearing or stops the progression of hearing loss in 76% of infants when baseline compared to tests 6 months later

• Significant side effects including bone marrow suppression, therefore if severe-profound hearing loss is present at birth, the doctors will likely not administer Ganciclovir due to physical risk and limited benefit in terms of hearing restoration.

Hearing eval:

• Audiogram

• ABR

• OAR

• Tympanometry

If suspected a child should be routinely monitored:

• Child should be assessed every __ to __ months

Speech and language therapy

• Must be tailored to needs

Appropriate counseling for the parents!

No approved _________ for prevention of CMV

_________ _________ is the #1 preventer

(esp when pregnant or trying to get pregnant)

_________ _________ providers and _________ of _________ are at the highest risk of contraction

This population tend to secrete the virus in their saliva and urine for many months following the first infection.

[typically asymptomatic]