Introduction to PURA syndrome

Definition

PURA syndrome is a rare neurodevelopmental disorder marked by severe mental disability, low muscle tone immediately after birth, difficulties eating and breathing, fits, and other neurological problems.¹

General characteristics

• Developmental delays and intellectual disability
• Neonatal hypotonia
• Feeding difficulties 
• Respiratory issues
• Epileptic seizures 
• Movement disorders
• Ophthalmological abnormalities
• Endocrine and metabolic issues 
• Orthopaedic complications²

Epilepsy in PURA syndrome

Onset and age of first seizures

The start of seizures in PURA syndrome can differ between cases. They usually start between the ages of 2 and 4, with most beginning at 3 years of age. However, cases can begin from birth up to 18 years old. Hence, it is important to assess for the possibility of seizures in patients with this condition.

Types of seizures

Individuals with PURA syndrome experience various seizure types, including myoclonic, generalised tonic-clonic, focal, epileptic spasms, atonic (drop attacks), and tonic seizures. Some seizures occur due to triggers like sound or light. These seizures reflect the complex neurological impacts of PURA syndrome.³

EEG findings and diagnostic methods

EEG tests on people with PURA syndrome often show many unusual signs, including background activity, epileptiform discharges, sleep-activated patterns, hypsarrhythmia and burst suppression.​

For diagnostic evaluation, EEG is a critical tool, especially when seizures are suspected. Comprehensive assessment may also include:​

• Developmental assessments: To check for cognitive and motor delays
• Brain imaging (MRI): Particularly in cases with seizures, apnoea, or visual problems
• Respiratory studies: Including sleep studies for apnoea assessment
• Cardiac and renal ultrasounds: To screen for congenital anomalies
• Musculoskeletal evaluations: To monitor for hip dysplasia or scoliosis

Response to anti-epileptic medications

People with PURA syndrome may have seizures that start early and are not controlled by regular epilepsy drugs. Aside from medication, options like the ketogenic diet have only had limited success for a small number of patients. One example of other types of medications used is pyridostigmine, which is an acetylcholinesterase inhibitor that has shown potential in reducing apnoea and improving neuromuscular symptoms. These results make it clear that people with PURA syndrome need personalised treatment plans, and more research is required to find effective ways to treat their seizures.

Long-term management and prognosis

Methods of management 

People with PURA syndrome usually require a full range of treatment, which includes speech, physical, and occupational therapies that start early to help with growth. Managing seizures may require the help of paediatric neurologists, who can advise on diet changes and administer antiepileptic drugs. Physical problems like scoliosis and hip dysplasia need to be checked for regularly. Feeding and breathing problems should also be taken care of by specialists. Due to the possibility of vision impairment, regular eye tests are also important to ensure a multimodal approach to treatment and improve quality of life.

Prognosis

The prognosis of PURA syndrome depends on the severity of symptoms and effectiveness of treatments on individual patients. Some patients may experience additional difficulties while others may hit certain developmental milestones. Long-term follow-up with a team of experts is needed to track progress and make any necessary changes to treatment plans.​^1,4

Cortical visual impairment (CVI)

Definition 

Damage to the brain’s visual processing areas leads to a neurological condition called cortical visual impairment, which is also sometimes called cerebral visual impairment.

Signs and symptoms in children with PURA syndrome

People with PURA syndrome present with a variety of signs, including developmental delays, hypotonia, epilepsy, and eating disorders. Symptoms also include daily fatigue, apnoea, musculoskeletal problems like scoliosis, and eye problems like strabismus and nystagmus. Children who are affected show different severity of signs.

Diagnostic tools 

A careful examination of neurological and developmental features using a number of diagnostic tools is needed to confirm a diagnosis of PURA syndrome.

Some important methods are:

• Vision tracking tests help identify vision problems in children with PURA syndrome, who often have trouble with fixation and tracking
• MRI scans to find problems in the brain that affect motor, cognitive, and visual skills. They are recommended for people who have seizures, apnoea, or vision problems
• EEG scans which can pick up on seizures, common in people with PURA syndrome
• Developmental and neurological tests can find delays in movement, speech, and cognitive skills, which can help doctors deduce the best way to treat the child

These diagnostic tools are needed to understand how the condition is affecting the child and how to give each person individualised care.

Impact on development and communication

PURA syndrome has an effect on growth and development. As it slows down brain growth, PURA syndrome causes severe delays in learning to move and talk. Children may miss developmental stages or be unable to walk. Most of them have mild to serious intellectual problems and have problems with their movements, such as ataxia and dyskinesia. Speech is often limited or nonexistent. Patients usually depend on other methods of expression, such assign language or symbol systems. Early intervention and support from a variety of fields are needed to improve quality of life.

Interventions and therapy strategies

Managing PURA syndrome requires a multidisciplinary method that is tailored to each person's needs. This approach should focus on managing symptoms, promoting development, and improving quality of life. Speech, occupational, and physical treatments, along with other early intervention methods, are very important. When used as directed by a doctor, antiepileptic drugs help keep seizures under control. Behavioural treatments improve adaptive skills while daily monitoring manages problems with the eyes and muscles. People with PURA syndrome have better outcomes with early, personalised, and thorough care.^5,6

Ataxia and motor coordination issues

Definition and types of ataxia 

Ataxia is a loss of muscle control that makes it hard to move, speak, or keep your balance. There are different kinds of ataxia: vestibular ataxia makes people feel dizzy and impairs their posture; sensory ataxia hurts proprioception and makes people walk with a stomping gait; and cerebral ataxia makes it hard to balance and use fine motor skills. Gait ataxia changes how fast, steadily, and consistently you walk, while truncal ataxia makes your trunk unstable. Knowing these differences can help healthcare professionals devise good treatment plans and understand why someone has ataxia.

How ataxia presents in PURA patients 

Ataxia helps explain why people with PURA syndrome have motor and cognitive delays. Most infants with the condition have low blood pressure at birth, which delays developmental stages and makes it hard to feed babies right away. A lot of infants will be able to walk on their own, but a lot of them will have problems with their gait, like taking wide, unsteady steps. Ataxia makes it hard to keep your balance and may present similarly to cerebral palsy.

Associated hypotonia and its contribution

One of the main signs of PURA syndrome is hypotonia, which means having insufficient muscle tone. Several neuromuscular symptoms are linked to this disease, and it has a major effect on motor development. 

Hypotonia in PURA syndrome makes it hard to breathe and eat. It often presents at birth as floppy infant syndrome. Motor delays are common, and some people never learn to walk on their own. Neuromuscular junction failure may happen, but it can be treated with pyridostigmine. PURA syndrome may sometimes present similarly to other neurological disorders, but DNA tests and other traits can help to distinguish it.

Physical therapy and supportive treatments​

Physical therapy for PURA syndrome focuses on motor skills like sitting, standing, and walking. It does this by using exercises to improve muscle power, balance, and coordination. Occupational therapy focuses on improving small motor skills and helping people become more independent in their daily lives. Speech therapy, on the other hand, helps people who have trouble communicating with AAC systems.

Prognosis and functional outcomes

Carers and medical professionals should be aware of what the outlook is for people with this illness and how they will be able to function.

Goals for development:

• Motor skills: Children with PURA syndrome often take longer to hit motor milestones
• Communication skills are usually poor, and patients might not be able to talk
• Patients with protein-truncating defects have more trouble speaking

Neurological and movement disorders:

• Seizures: It presents as infantile seizures and Lennox-Gastaut syndrome in about half of people who have epilepsy
• People could have ataxia, dystonia, dyskinesia, or other problems with how they move. One case study mentioned a person who had strabismus, nystagmus, and myoclonus of the eyelids

Cognitive outcomes:

There are a lot of patients with this condition who have serious brain disabilities. A lot of them can't move or talk on their own. Distinct facial features and difficulty with eye tracking are also noteworthy symptoms.^7,8

Long-term prognosis:

Some motor skills may improve with age, but patients will usually still have severe developmental defects and neurological issues. People with PURA syndrome need constant care from a variety of fields to meet their changing needs.​¹

Summary

• PURA leads to brain disabilities, hypotonia, seizures, and problems with motor coordination
• EEG, MRI, and growth tests are the preferred diagnostic tools
• Speech, physical, and occupational treatment are all needed for long-term management
• The outlook isn't always good; movement and cognitive delays stay, though they may improve over time