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The Paediatric Neurology Department at the Hospital Vall d’Hebron is specialised in the genetic diagnosis of childhood neurological diseases. It participates in different national and European reference networks (like the URDCat Project, Solve-RD, and the European Reference Network for Rare Neurological Diseases), which centralises a large number of paediatric patients with hereditary dystonia. The genetic studies are carried out in the Paediatric Neurology Laboratory as part of several different research studies, which are funded by national and international entities as well as associations of families affected by dystonia.
Patients who are likely to suffer from dystonia undergo different metabolic, neurophysiological, and neuroimaging tests in order to classify what kind of dystonia they have, before carrying out genetic studies. Next, DNA sequencing studies are performed to establish the genetic origin of the dystonia.
To determine the origin of the patient’s dystonia, which is essential for deciding on a correct course of treatment.
There are many different genetic origins of dystonia. Therefore, diagnosing it requires both conventional and newly developed DNA sequencing techniques.
For patients with myoclonus-dystonia, first, Sanger sequencing is done for the epsilon-sarcoglycan gene, which is responsible for 70% of myoclonus-dystonia cases in children.
For patients with other kinds of dystonia, whole-exome sequencing (on the parents and the patient) or sequencing for the index case (the patient) is done first, depending on the DNA samples available.
There are no risks for the patient.
Dystonia is a neurological disorder characterised by involuntary muscle contractions that cause repetitive movements and tortuous and painful stances every time the patient makes a learned movement, such as walking or speaking.
Dystonia that is detected in childhood can progress rapidly and interfere in the development of the child's language and mobility, causing a physical disability that will affect them throughout life.
Dystonia is a very heterogeneous disease, which can occur for a variety of reasons:
Due to its incidence, dystonia is considered a rare disease.
Dystonia in childhood can occur in isolation or associated with other neurological and development problems. It can cause difficulty in everyday tasks such as walking, speaking, feeding oneself and taking care of personal hygiene.
When presented in isolation it is called primary dystonia and often has a genetic origin. Children who suffer from it do not usually have other health problems and their neurological development is normal. At first it manifests itself in actions such as walking, running, or writing and, later, can spread to other parts of the body and cause widespread dystonia.
Myoclonic dystonia is one of the most frequent hereditary forms of dystonia in childhood. It is characterised by the presence of sustained (dystonic) and abrupt (myoclonic) muscle contractions and psychiatric disorders such as anxiety, depression and obsessive-compulsive features. The first symptoms appear in childhood and affect the lower limbs of children, who have difficulties walking, running and with sports. This disease also affects the social relationships of these children, who have problems speaking in public or eating and drinking with friends.
Dystonia can also be associated with other neurological problems, such as spasticity, ataxia, weakness, delay in neurological development and intellectual disability. In this case we call it secondary dystonia and it is necessary to rule out neurometabolic and neurodegenerative causes.
It affects children, adolescents, and adults of all ages.
First of all, patients are subjected to a series of clinical, metabolic, neurophysiological and neuroimaging studies to classify the type of dystonia, before carrying out genetic studies. In patients with myoclonic dystonia, first of all, a Sanger sequencing study is carried out to determine the gene that causes it, and in the other patients, a complete family exome sequencing(parents and patient) is carried out or the index case (patient) based on the DNA samples available.
Being a rare and very heterogeneous disease it is difficult to reach a correct diagnosis and treatment plan. It is important to distinguish hereditary dystonia from childhood cerebral palsy, caused by brain damage at birth, since its diagnosis has very important consequences for treating the disease later.
A diagnosis in time decreases the need to carry out more diagnostic tests, making it possible to form a prognosis and to advise families on avoiding future diseases. It also has a very positive psychosocial impact on the patient and family. And most importantly, an exact diagnosis of the cause that generates the dystonia makes it possible to guide the best possible treatment for each patient, in what we call personalised medicine.
Dystonia in childhood is progressive and debilitating, but can be prevented with early diagnosis and the use of specific therapies depending on the identified genetic defect.
Levodopa is the treatment of choice in dopa-sensitive dystonia, caused by a defect in the synthesis of dopamine. Botulinum toxin is used to control focal dystonia. In the case of widespread dystonia, different drugs are used to decrease tremors, muscle tone, and painful spasms. And in some cases of paroxysmal dystonia, which is characterised by brief and repetitive involuntary movements during the night, antiepileptic drugs are used.
An intrathecal baclofen pump administers liquid medication through a device that is placed under the skin, and is used to treat generalised secondary forms of dystonia. It reduces pain, decreases muscle tone and spasms. It is a treatment we call symptomatic and palliative, since it does not improve the motor function of the patient.
Deep brain stimulation or globus pallidus stimulation, two electrodes are placed in the globus pallidus using a stereotaxic technique, it is the treatment of choice in primary dystonia, especially if they are widespread and do not respond to conventional medication. In these cases children can recover the function of the area affected by dystonia and improve their quality of life. It can also be useful in patients with secondary forms of dystonia, although its effectiveness is less than in primary forms of dystonia.
Performing genetic testing is the best prevention to avoid having more children affected by this disease in the same family.
Campanya MoutePerLaDistonia
Associació de Lluita contra la Distonia Mioclònica a Espanya
Associació de Malalties Neurodegeneratives amb Acumulació Cerebral de Ferro
Associació GNAO Espanya
Cerebral palsy is a group of disorders affecting movement, posture and muscle tightness, caused by damage to the developing brain (in children up to approximately three years old). The severity of the symptoms varies widely: some patients can walk and lead independent lives, while others are more severely disabled. There may also be associated intellectual disabilities, problems with vision or hearing, problems when eating, seizures, etc.
These can be categorised according to the moment when the brain damage occurs: prenatal, perinatal and postnatal. Currently, the most frequent causes are: extremely premature birth, hypoxia of the brain during birth, and paediatric stroke.
In babies, we see slower psychomotor development, with difficulties in movements or activities. We usually see spasticity, which could be defined as increased tightness in a certain group of muscles. There are major musculoskeletal abnormalities, including spinal deformity, hip dislocation and ankle equinus.
Fundamentally clinical diagnosis, depending on the patient's history. But confirmation is needed by additional imaging tests such as cranial ultrasound and magnetic resonance imaging. However, these can be normal.
Unfortunately, there is no cure for cerebral palsy. However, we can deal with the pathology in different ways, both in prevention and in treatment:
No specific prevention is possible.
Apart from the physiotherapy and/or occupational therapy which can be offered or recommended to these patients, physical exercise can always be suggested, depending on the abilities of each person. We also recommend stretching certain muscle groups and trying to correct posture.
Hereditary metabolic diseases (HMDs) are a group of rare genetic disorders. The genetic defect causes a structural alteration in a protein that is involved in one of the metabolic pathways, causing it to block the affected pathway. As a consequence, this causes a build up of substances that may be toxic for the body and a deficiency of others that it needs.
Hereditary metabolic diseases (HMD) are chronic progressive multi-system illnesses that may appear at any age and that in most cases pose diagnostic and therapeutic challenges. Our Unit has been recognised as a leader within Spain (CSUR) and Europe (ERN) for this pathology and takes part in the neonatal screening programme in Catalonia. We are the only centre in Catalonia to offer complete care from paediatrics to adults with particular expertise in lysosomal storage disorders.
HMDs are divided into:
- Intermediary metabolism HMD: usually with acute symptoms.
- HMD related to the organelles (lysosomal storage disorders, peroxisomal diseases, mitochondrial disorders and endoplasmic reticulum storage diseases): chronic presentation with no decompensations (with the exception of some mitochondrial disorders)
Multiple systems in the body are affected and different organs and systems are involved with varying symptoms depending on the disorder and the patient’s age. These disorders require a coordinated approach to care and programmes to manage the transition to adulthood.
Many symptoms become evident during childhood in the form of delayed physical growth and delayed psychomotor development. There may be associated heart problems, kidney conditions, and at times decompensations leading to liver or kidney failure and neurological impairment. In the case of organelle disorders, symptoms are chronic and affect the bones and organs of the senses in greater measure. They are more common in adults than intermediary metabolism disorders.
Diagnosis is carried out by:
They are chronic disorders that need to be treated in specialised centres with multidisciplinary teams to provide support for all related health problems.
The following may be necessary, depending on the type of disorder:
Prevention consists of thorough genetic and reproductive counselling if there is a family history of the disease. Early diagnosis of some diseases through the neonatal screening programme enables effective treatment and improved prognosis.
Complex paediatric neurosurgery encompasses a series of pathologies that, due to their complexity, have to be treated in a centre with the necessary technology, professionals and expertise.
Complex paediatric neurosurgery includes:
In general, these are unusual and highly complex diseases. Many are included under the sections for rare diseases. For the best results, they should be treated in large centres that have experience of multiple cases every year and that are equipped with the technology required to treat these disorders.
Each condition has its own characteristics. In the case of a brain tumour, the child’s symptoms will depend on the area of the brain where the tumour is located.
When there are cases of decompensated hydrocephalus or severe intracranial hypertension, in other words, when there is increased pressure inside the skull, the child may have headaches, visual disturbances and may go into a coma.
Craniofacial malformations are characterised by severe deformities of the bones in the skull and face.
They tend to be rare. It is unusual to treat more than ten cases of each pathology per year.
Diagnosis of neurosurgical pathologies includes:
Assessing the results also involves psychologists or other professionals to objectively observe changes in cognitive function and quality of life.
Treatment of pathologies covered by complex paediatric neurosurgery is usually surgical. This means having an operating room equipped with advanced technology that allows intraoperative monitoring, and specialised anaesthetists and nursing staff.
Unfortunately there are no known preventative measure for these disorders. Our principal task is to restore lost function and achieve the best results so that, where possible, the child can develop normally and integrate as much as possible into family life, school and socially.
Neuromuscular disease is a chronic illness that results in serious disability, loss of independence, and with significant psychosocial consequences. Respiratory alterations are the main cause of morbidity and mortality in patients with neuromuscular diseases. They are significantly affected by the evolution of the disease and are the reason for multiple hospital admissions where the patient’s life is seriously endangered.
The main causes of respiratory impairment are hypoventilation due to weak inspiratory muscles and a lack of ability to cough due to weak expiratory muscles. Ventilatory support via non-invasive mechanical ventilation or tracheotomy can prevent or reverse ventilatory failure in these patients.
The loss of expiratory strength means that patients are unable to expel bronchial secretions. If the bulbar muscles are also affected and patients run the risk of inhaling saliva, the contents of the mouth or food, this can induce multiple respiratory infections, pneumonia and atelectasis which results in obstruction of the airway and seriously endangers the patient's life.
The combination of non-invasive mechanical ventilation to assist coughing decreases morbidity and hospital admissions for these patients.
There are currently around 60,000 people with the condition in Spain.
In the Cardiorespiratory Rehabilitation Unit, we monitor maximal inspiratory and expiratory pressure (MIP and MEP) and peak expiratory flow (PEF), also known as peak cough flow (PCF) and carry out spirometry.
Treatment goals are focused on controlling the evolution of the ventilatory failure and avoiding or improving episodes of respiratory failure. To achieve these objectives, manual techniques or equipment have to be used. These are techniques to encourage pulmonary expansion, manually assist coughing, and others.
One very important objective is to train the main carer in physiotherapy techniques in order to avoid possible complications in the respiratory system.
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