CHARGE Syndrome and Hearing Loss

Parents often reach a diagnosis after weeks in a neonatal unit, when heart, breathing and feeding concerns dominate the conversation. Hearing is frequently addressed later. Yet it shapes a child's language, schooling and independence for many years, so understanding it early makes a considerable difference.

Understanding the Condition

CHARGE is a genetic condition present from birth. Its name began as an acronym for the features first seen together in affected children:

• Coloboma, a gap in the structures of the eye
• Heart defects
• Atresia of the choanae, a blockage of the nasal passages
• Restricted growth and development (originally termed retardation)
• Genital differences
• Ear abnormalities, including hearing impairment

It occurs in roughly 1 in 8,500 to 1 in 10,000 births. Most cases trace back to a change in the CHD7 gene, which directs how tissues form in the early embryo. The change usually arises spontaneously, which is why most families have no history of the condition. Because CHD7 influences the ear, eye, heart and cranial nerves, the effects are wide, and no two children are affected in quite the same way.

Clinical Criteria for Diagnosis

Diagnosis rests on careful clinical assessment, supported by genetic testing. Clinicians sort the features into two groups.

• Major features: coloboma, choanal atresia and abnormal semicircular canals in the inner ear
• Minor features: cranial nerve and brainstem dysfunction, hormonal and pubertal differences, abnormalities of the outer or middle ear, heart or oesophageal malformations, and developmental delay

The typical form is generally diagnosed when a child has three major features, or two major and two minor ones. A confirmed CHD7 variant strengthens the case, although a negative genetic result does not always rule the condition out. Ear findings feature prominently in these criteria, which reflects how central the ear is to the condition.

Common Clinical Features

Symptoms differ widely. Beyond those captured in the name, families often notice:

• Difficulty feeding and swallowing in infancy
• A reduced or absent sense of smell
• Weakness or asymmetry of the face
• Delayed walking and poor balance
• Frequent ear and chest infections
• Varying degrees of visual impairment

Many of these come from involvement of the cranial nerves, which carry the signals for hearing, balance, smell, facial movement and swallowing. That shared origin explains why hearing problems seldom occur in isolation.

Prevalence and Nature of Hearing Impairment

Hearing difficulty is among the most frequent findings. Studies commonly report hearing loss in more than 80 percent of affected individuals, in one or both ears. The degree ranges from mild to profound and often differs between the two sides.

The structural differences form before birth, so this is a type of congenital hearing loss. It is not always identified immediately, especially when a baby is unwell and screening is postponed. Some children also experience fluctuating or declining hearing through childhood. For that reason, a single early assessment is not sufficient, and monitoring needs to continue.

Structural Causes Within the Ear

Any part of the ear can be involved.

Outer ear

• Small, low-set, cupped or uneven ears
• Narrow canals that trap wax and debris
• In some children, no canal at all

Middle ear

• Malformed or fixed ossicles, the tiny bones that carry sound
• Poor ventilation, which leaves fluid behind the eardrum
• Repeated infections that further reduce sound transmission

Inner ear

• An underdeveloped cochlea, the organ that turns sound into nerve signals
• Underdeveloped or absent semicircular canals, found in the great majority of affected individuals
• A small or absent cochlear nerve in some cases

Since the anatomy varies so much, one treatment cannot suit everyone. CT or MRI scans of the temporal bone allow clinicians to map each child's ears before planning care.

Types of Hearing Loss

Three patterns are recognised, and many children have more than one at the same time.

• Conductive: Sound is blocked before it reaches the inner ear, usually by ossicle problems, narrow canals or fluid. Some of this may be treated medically or surgically.
• Sensorineural: The cochlea or auditory nerve does not process sound properly. This form is generally permanent.
• Mixed: Both mechanisms are present, which is common in this group of children.

The mixed pattern is the most difficult to manage. Fluid in the middle ear can add a temporary conductive loss on top of a permanent sensorineural one, so a child may hear noticeably better one week than the next.

Early Detection and Assessment

Early identification protects language development, and testing should suit the child's age and general health. Several methods are used together:

• Newborn screening: Otoacoustic emissions and automated auditory brainstem response give a first indication, although blocked canals or fluid can distort the result.
• Auditory brainstem response: This records the response of the auditory nerve and brainstem to sound and can estimate thresholds in infants, sometimes under sedation.
• Tympanometry: It checks how well the middle ear is working and detects fluid.
• Behavioural audiometry: Play-based or visual reinforcement methods are used for older babies and toddlers.
• Imaging: Scans show the structure of the inner ear and nerve, which guides decisions about devices.

Hearing tests for children with this condition are best carried out by a paediatric audiologist who has experience with complex cases. Repeat testing at regular intervals is standard practice, since one normal result does not guarantee stable hearing.

Amplification and Treatment Options

Care is individualised and usually involves audiologists, ENT specialists and speech and language therapists working together.

• Hearing aids: Behind-the-ear models suit many children. Custom earmoulds are needed for ears of unusual shape, and fitting requires patience because canals are narrow and the outer ear may be small or folded.
• Bone conduction devices: Worn on a soft band in early childhood, these carry sound through the skull and bypass the outer and middle ear. They help most when the canal is absent or repeatedly blocked.
• Cochlear implants: A child with severe to profound sensorineural loss may benefit, provided a cochlear nerve is present. Results depend on anatomy, so assessment has to be thorough.
• Medical and surgical care: The ENT team weighs the treatment of middle ear fluid, including ventilation tubes in selected cases.
• Routine ear care: Regular cleaning and early treatment of infections protect whatever hearing the child has.

Technology matters, but steady follow-up and daily use of the device often determine how well a child does.

Communication, Vision and Balance

Hearing seldom works in isolation. Coloboma affects vision in many children, and inner ear differences can disturb balance. When both hearing and sight are reduced, the child has a dual sensory impairment, which changes how communication is taught.

• Spoken language is supported by amplification and speech therapy where hearing permits.
• Sign language, including tactile signing, can be adapted for children with limited vision.
• Visual and touch cues, such as object symbols and daily calendars, help a child understand routine.
• Balance and motor therapy builds posture, walking and confidence.

Programmes that combine these approaches give children a stronger foundation than any single method.

Adulthood and Long-Term Needs

More children now reach adulthood, and attention has turned to their long-term needs. Adults living with CHARGE syndrome usually need continued audiological review, because hearing can change with time. Employment, independent living and navigating healthcare can be demanding, particularly when vision, balance or swallowing are also affected. Access to communication matters greatly here, including suitable devices, clear written information and support at medical appointments. With consistent help, many adults go on to pursue further education, sustain employment and build lasting relationships.

Supporting Families

A diagnosis like this can feel overwhelming, but families have access to support. The following steps are practical starting points:

• Arrange an audiological assessment early and repeat it regularly
• Assemble a care team with an ENT specialist, audiologist, ophthalmologist and speech therapist
• Encourage consistent use of hearing devices, even when progress seems slow
• Connect with parent groups and specialist organisations for shared experience

Awareness of hearing loss in children is growing, and with it the recognition that early, well-coordinated support improves outcomes. Given the right tools at the right time, every child with this condition can communicate, learn and participate fully in daily life.

If you have any concern about a child's hearing, a timely evaluation by a qualified audiologist is the most useful first step.