Skip to main content

Advertisement

Table 4 The neurological components of Friedreich ataxia

From: Consensus clinical management guidelines for Friedreich ataxia

1.1 Ataxia
Recommendations Grade
Regular neurological examination should take place, and may guide referral to appropriate specialists in a timely fashion. GPP
Physical therapy may be useful to help with balance, flexibility, accuracy of limb movements, and maintenance of strength. GPP
Occupational therapy may identify risks for people with ataxia as well as help minimize difficulties in the performance of daily activities. GPP
Routine orthopedic care is necessary to follow and treat orthopedic issues that can influence ataxia. GPP
1.2 Weakness
Recommendations Grade
Assessment of muscle weakness is an essential part of the functional evaluation of an individual with FRDA. GPP
Fatigue is a prevalent symptom in FRDA that may be included in quality of life assessments of individuals with FRDA. GPP
Physical therapy and exercise training may improve strength, motor performance and reduce fatigue. GPP
Muscle weakness may interfere with the clinical assessment of coordination and gait in individuals with FRDA. GPP
Medications improving mitochondrial function may improve muscle strength and reduce fatigue. GPP
1.3 Neuropathy
Recommendations Grade
Neuropathic pain may be treated with Gabapentin, Pregabalin, Lamotrigine, Amitriptyline or Duloxetine. C [20],[21]
A detailed sensory assessment and examination will establish the extent of neuropathy. GPP
Protective foot care is important. GPP
Preventative measures such as review of daily activities, transfers and wheelchair positioning may reduce the incidence of focal neuropathies. GPP
1.4 Spasticity and muscle spasm
Recommendations Grade
People with FRDA may benefit from assessment for spasticity, pain and spasms (including nocturnal spasms) and incipient or established contracture. This may guide treatment. GPP
On implementation of an anti-spasticity intervention, individuals with FRDA may benefit from reassessment as the treatment of spasticity can unmask weakness and cause deterioration in gait and standing transfers. Individuals should be warned of this phenomenon before anti-spasticity interventions are commenced. GPP
Aggravating factors such as infection, pain, constipation, diarrhea, dehydration and pressure sores should be considered and treated in the context of acute onset or exacerbation of spasticity and/or ataxia. GPP
Spasticity and spasms should be treated at an early stage, initially by non-pharmacological means. If these are unsuccessful, pharmacological means such as the use of Baclofen, Tizanidine, Benzodiazepines, Dantrolene sodium, Gabapentin, botulinum toxin injections, alcohol and phenol injections or intrathecal Baclofen pumps may be considered. The benefit of such compounds must be balanced against adverse effects they might produce on other symptoms of FRDA (for example ataxia). In the last resort, surgical options may be considered. The distribution of spasticity around the body may also determine which intervention is chosen. C [22]-[24]
Individuals with FRDA, families and caregivers should be educated to monitor the development of spasticity and incipient contractures, and should be given an ongoing plan of exercises and passive or active stretching to be performed routinely outside the clinical setting. C [22]
1.5 Restless legs (RLS)
Recommendations Grade
People with FRDA should be specifically asked if they have RLS symptoms. B [25],[26]
A full history of the symptoms should be taken from patients suspected of having RLS so that other confounding conditions i.e. periodic leg movements can be excluded. B [27]
Secondary causes of RLS should be excluded, in particular, a drug history should be taken and serum ferritin measurement should be undertaken. B [27]
Initial treatment of RLS should consider the needs of the patient, the severity of the symptoms, the relative significance of the reported effects of the treatment and the level of dysfunction attributable to RLS. A [28]
1.6 Mobility
Recommendations Grade
Mobility, balance, core stability, trunk control, spasticity, foot position and strength should be assessed by a suitably qualified physical therapist. GPP
The impact of spasticity of lower limbs on mobility should be evaluated when assessing gait. GPP
Foot and ankle posture should be assessed by a suitably qualified physical therapist and treated proactively. D [5],[29]
Strategies such as an appropriate exercise program, aquatic physical therapy and stretches may be implemented to prolong ambulation and reduce the number of falls in people with FRDA. D [30],[31]
Individuals with FRDA dependent on a wheelchair for mobility may still benefit from rehabilitation to improve their mobility. D [31]
Botulinum toxin and prescription of ankle-foot orthotics may be useful in reducing the impact of spasticity during mobility and will help maintain good foot alignment for mobility. GPP
Gait aid provision may prolong the capacity to walk. A heavy/weighted gait-aid may be a beneficial for some individuals with FRDA. GPP
Standing frame and tilt table may be used to maintain foot alignment to enable independent transfers. GPP
An inpatient rehabilitation program may prolong mobility and transfer ability. D [31]
1.7 Dysarthria
Recommendations Grade
People with FRDA should undergo a comprehensive communication evaluation by a speech and language pathologist at the time of diagnosis or symptom onset and thereafter undertake review assessments to monitor performance. C [32]
Instruction in environmental modification may be beneficial for individuals with motor speech difficulties. C [33]
Participation in intensive and systematic behavior therapy may be beneficial to people with FRDA with dysarthria. C [33]
Traditional non-systematic behavioral therapy may not be helpful for mitigating the effects of progressive dysarthria. GPP
1.8 Dysphagia
Recommendations Grade
People with FRDA should undergo a comprehensive swallowing evaluation by a speech and language pathologist at the time of diagnosis or symptom onset and thereafter to monitor performance. D [34],[35]
Instruction in environmental modification and compensatory postures may be beneficial for individuals with dysphagia. D [36]-[39]
Instruction in dietary modification may be beneficial for individuals with dysphagia. D [38],[40],[41]
Traditional non-systematic behavioral therapy (e.g., oral motor therapy) may not be helpful for mitigating the effects of dysphagia. GPP
1.9 Vision
Recommendations Grade
Screening or testing as per country specific general vision screening guidelines should be applied to individuals with FRDA. GPP
Memantine, Acetazolamide, Aminopyridine, Clonazepam, Gabapentin or Ondansetron may be of benefit in treating square wave jerks and ocular flutter. D [42]
1.10 Bladder dysfunction
Recommendations Grade
Exclusion of a concomitant urinary tract infection and assessment of post micturition residual urine is recommended prior to commencement of treatment. C [43],[44]
Antimuscarinic medications may be considered for people with FRDA displaying overactive bladder symptoms. GPP
Intradetrusor injections of Botulinum toxin A or suprapubic catheterization may be considered as alternative intervention. GPP
In a patient with persistently elevated post void residual volumes in excess of 100 mL, clean intermittent self-catheterization is indicated. GPP
1.11 Bowel dysfunction
Recommendations Grade
Consider modifying diet and lifestyle to optimize stool consistency and avoid fecal incontinence. GPP
Titrate appropriate laxatives to optimize gut transit, stool consistency and avoid fecal impaction. Consider the use of prokinetic drugs. GPP
Avoid fecal incontinence by treating fecal impaction if present. Facilitate prompt rectal evacuation via use of manual maneuvers and/or use of suppositories/mini enemas. Consider use of transanal irrigation and biofeedback behavioral therapy. GPP
1.12 Sexual function
Recommendations Grade
Individuals with FRDA may benefit from discussion regarding their sexual function. GPP
Reported sexual dysfunction should be investigated. GPP
Symptomatic management of erectile dysfunction involves the use of phosphodiesterase-5 inhibitors but should only be prescribed in an individual with cardiac disease after consultation with the individual’s cardiologist. GPP
1.13 Audiological function
Recommendations Grade
People with FRDA should undergo a comprehensive auditory evaluation at the time of diagnosis and thereafter annually undertake a hearing screen or sooner if warranted by a sudden change in auditory performance. B [45]
Instruction in “listening tactics” may be beneficial for individuals with hearing difficulties. B [46]
FM-listening devices fitted by an audiologist may improve day-to-day listening and general communication in individuals with FRDA. B [47]
Conventional hearing aids and cochlear implants may not improve the hearing impairment related to FRDA. GPP
1.14 Cognition
Recommendations Grade
Consideration should be given to changes in cognitive function that may impact on independence. GPP
The impact of cognitive capacity on academic skills should be considered in academic environments. GPP
1.15 Rehabilitation
Recommendations Grade
Intensive inpatient rehabilitation is beneficial in improving function for people with FRDA. C [31]
People with FRDA may require a cardiologist opinion prior to undergoing aquatic physical therapy. GPP
Rehabilitation may be provided in various home or community based settings. GPP
Rehabilitation should be provided by allied health staff with expertise in neurological conditions. GPP
People with FRDA may benefit from maintenance rehabilitation and regular review of function. GPP
2 The heart, cardiovascular and respiratory systems in Friedreich Ataxia
2.1 The heart in Friedreich Ataxia
Recommendations Grade
Cardiac evaluation and non-drug therapy
An EKG and an echocardiogram should be performed at diagnosis and then at least annually. GPP
A Holter and/or Loop monitor assessment should be performed if an individual with FRDA has palpitations. GPP
Evaluation by a cardiologist should take place if an individual with FRDA has cardiac symptoms or abnormal results on cardiac testing. GPP
Evaluation by a cardiologist should take place prior to major surgery. GPP
Cardiac monitoring should take place during major surgery. GPP
Major surgery should be conducted in a center with cardiac intensive care facilities. GPP
Exercise therapy, including structured aerobic exercise and light weights, is recommended. GPP
Heavy weight training is not advised. GPP
Pharmacological therapy for slowing or prevention of deterioration of left ventricular contraction in asymptomatic individuals with reduced ejection fraction
An angiotensin converting enzyme inhibitor (Enalapril, Ramipril, Lisinopril or Trandolapril) is first line therapy but if the angiotensin converting enzyme inhibitor is not tolerated then an angiotensin 2 receptor blocker (Candesartan, Valsartan) should be commenced instead (second line therapy). C [48]
Beta blockers (Carvedilol, Bisoprolol or long acting Metoprolol) should be considered as an addition to an angiotensin converting enzyme inhibitor or angiotensin 2 receptor blocker, particularly if the heart rate is >75/min. C [48]
Pharmacological therapy for treatment of symptomatic heart failure with reduced LV ejection fraction
A diuretic should be prescribed for fluid overload. C [48]
An angiotensin converting enzyme inhibitor (Enalapril, Ramipril, Lisinopril or Trandolapril) is first line therapy but if the angiotensin converting enzyme inhibitor is not tolerated then an angiotensin 2 receptor blocker (Candesartan, Valsartan) should be commenced instead (second line therapy). C [48]
Beta blockers (Carvedilol, Bisoprolol or long acting Metoprolol) should be added (first line therapy) to the angiotensin converting enzyme inhibitor or angiotensin 2 receptor blocker, however the role of beta blockers in children is less clear. C [48]
Spironolactone or Eplerenone should be considered for individuals with New York Heart Association (NYHA) stage 3 or 4 symptoms. C [48]
Calcium channel blockers with negative inotropic effects (Verapamil and Diltiazem) should be avoided. C [48]
Digoxin should be considered for control of ventricular response if atrial fibrillation is present. C [48]
Device therapy for subjects with symptomatic heart failure and reduced ejection fraction
Implantation of an automatic internal cardioverter defibrillator should be considered if left ventricular ejection fraction (LVEF) is ≤35%, the individual has NYHA functional class 2 or 3 symptoms despite receiving optimal medical therapy, and the individual has a reasonable expectation of survival with good functional status for more than 1 year. C [49]
Cardiac resynchronization therapy should be considered in individuals with LVEF of ≤35%, sinus rhythm, a QRS duration ≥0.12 seconds and NYHA functional class 3 or 4 symptoms despite receiving optimal medical therapy. C [49]
Antiarrhythmic agents for prevention of recurrence of atrial arrhythmias
Agents which may be considered for prevention of recurrence of atrial arrhythmias are a beta blocker (Metoprolol, Bisoprolol or Carvedilol), Sotalol, Dofetilide or Amiodarone. C [50]
Agents which should be avoided include Quinidine, Flecainide, Propafenone and Disopyramide due to their negatively inotropic and/or pro-arrhythmic effects. C [50]
Anticoagulation for atrial arrhythmias
Anticoagulation should not be commenced if the LVEF is normal and there are no other risk factors for thromboembolism C [50]
Anticoagulation with Warfarin or one of the novel anticoagulants (Dabigatran, Rivaroxaban or Apixaban) should be considered in paroxysmal or permanent AF if one CHADS2 risk factor is present and will be generally indicated if more than one CHADS2 risk factor is present. C [50]
Anticoagulation with warfarin or one of the novel anticoagulants (Dabigatran, Rivaroxaban or Apixaban) is strongly recommended in paroxysmal or permanent AF if there is reduced LVEF. C [50]
Antiarrhythmic agents for prevention of recurrence of ventricular arrhythmias
A beta blocker (Metoprolol, Bisoprolol or Carvedilol) should be used, but Sotalol and Amiodarone are second-line options if there is arrhythmia recurrence despite beta blocker use. C [49]
Cardiac transplantation
It is recommended that individuals with FRDA should be considered for heart transplantation if they experience severe heart failure which does not respond to maximal medical management. GPP
2.2 Sleep
Recommendations Grading
Clinicians, caregivers and individuals with FRDA should be aware there is increased prevalence of obstructive sleep apnea (OSA) as FRDA progresses. C [51]
Annual evaluation of presence of sleep disordered breathing may be undertaken by administering of the Epworth Sleepiness Scale and reporting of clinical symptoms. C [51]
For individuals with FRDA there should be a lower threshold for referral to a Sleep Physician and for polysomnography. C [51]
Nasal continuous positive airway pressure therapy should be considered in the treatment of OSA. C [52]
2.3 Pain management and anesthesia
Recommendations Grading
Consideration should be given to appropriate management of peri-operative pain in people with FRDA. GPP
Consideration should be given to the use of nondepolarizing muscle relaxants, in particular accurate assessment of neuromuscular block throughout anesthesia. D [53],[54]
Consideration should be given to avoiding risks associated with hyperkalemia. GPP
There should be careful monitoring of fluid balance and cardiovascular function in people with FRDA undergoing anesthesia. GPP
3. Scoliosis
Recommendations Grading
Individuals with FRDA with a spinal curve between 20° and 40° and/or between the ages of 10–16 years should be observed for curve progression. GPP
Bracing may not reduce or stop the progression of curves however may be valuable in delaying surgical correction in the young child. D [55]
People with FRDA with a scoliosis >40° may be considered appropriate for surgical correction. D [56],[57]
Consideration should be given to delaying surgical intervention in ambulant individuals with FRDA. D [55]
All people with FRDA considered for scoliosis surgery require extensive pre-operative evaluation and planning regarding cardiac and pulmonary function. GPP
4. Diabetes mellitus
Recommendations Grading
HbA1C may not be a good screening/diagnostic test in FRDA as it is not recommended in young individuals and in people in whom diabetes may present acutely. GPP
Blood glucose should be measured at least once a year. GPP
Oral glucose tolerance tests have a better sensitivity than fasting plasma glucose or HbA1c to detect early changes in glucose metabolism, and enable earlier diagnosis of diabetes. GPP
Diabetes treatment should be initiated early. GPP
Lifestyle changes (diet and exercise) should be implemented in all with diabetes. GPP
Insulin therapy should be initiated if diet and exercise alone do not achieve glucose control. GPP
5. Genetic issues
Recommendations Grading
Any individual in whom the diagnosis of FRDA is considered should undergo genetic testing for FRDA. GPP
Referral to a clinical geneticist or genetic counselor should be considered on diagnosis of FRDA. GPP
Requests for pre-symptomatic genetic testing are best managed on a case-by-case basis; there is no evidence to support the routine provision or refusal of pre-symptomatic genetic testing for FRDA. GPP
The committee did not reach consensus on the issue of whether it is appropriate to conduct presymptomatic testing in a minor. Where a request for presymptomatic testing in a minor occurs, the individual/family should be referred to a team with expertise in this field for discussion about pre-symptomatic genetic testing in which the risks and benefits of pre-symptomatic genetic diagnosis are put forward. The risks and benefits from both the child’s and parents’ perspectives should be carefully reviewed during the pre-test assessment. GPP
A multidisciplinary approach to the pre-symptomatic testing process, with the additional involvement of a psychologist or psychiatrist with expertise in pediatric and adolescent issues, and if necessary a bioethicist, should be considered. GPP
All patients identified pre-symptomatically and their families would benefit from immediate post-test counseling and psychosocial support and referral for appropriate neurological and cardiac surveillance. GPP
Minors who have the maturity to do so, should be involved in the decision as to whether or not they are tested. GPP
There is no evidence to support routine use of anti-oxidant therapies, such as Idebenone in patients diagnosed pre-symptomatically. GPP
Carrier testing should be first undertaken on the closest relative. GPP
6. Friedreich Ataxia due to compound heterozygosity for a FXN Intron 1 GAA expansion and point mutation/insertion/deletion
Recommendation Grading
If a person compound heterozygous for a FXN GAA expansion and a point mutation/insertion/deletion has a similar phenotype to those with FRDA due to homozygosity for GAA expansions, they should be managed as per the guidelines in this document. GPP
If spastic ataxia is the predominant phenotype, then the main management issue is that of spasticity and the guidelines for management of spasticity should be followed. GPP
It should never be assumed that other features of typical FRDA will not be present (e.g. cardiomyopathy, diabetes) and therefore monitoring for these should take place. GPP
7 Pregnancy
Recommendations Grading
The availability of testing for carrier status of reproductive partners should be made known to couples where one member has FRDA. If testing is requested, the carrier status of the unaffected partner should be established prior to conception in order to advise the couple of the risk of having a child with FRDA and to offer appropriate counseling. GPP
When possible, it is advisable for women to have children earlier in their disease course. GPP
Glucose tolerance testing should be performed between 24–28 weeks of gestation or earlier for individuals deemed to be at high risk by their practitioner. D [58]
Women with FRDA should have close monitoring by a cardiologist during pregnancy. GPP
Pregnant women with FRDA and deep venous thrombosis should be treated with Heparin as opposed to Warfarin. D [59]
Vaginal delivery can be expected for most pregnancies in women with FRDA. D [60]
Close fetal monitoring during delivery is recommended. D [61]
If Cesarean section is medically indicated, epidural or spinal anesthesia can generally be safely used in women with FRDA. D [62],[63]
8 Issues related to quality of life
8.1 Quality of life
Recommendations Grading
Adherence to the guidelines for managing FRDA may improve quality of life. GPP
8.2 Mental health issues
Recommendations Grading
Individuals with FRDA require regular evaluation in terms of risks for developing depression and/or other mental health issues. GPP
Individuals with FRDA may benefit from regular counseling to assist in adjusting to transitional events and possibly prevent the emergence of related depression. GPP
Individuals with FRDA identified with depression should be treated with established interventions including counseling +/− pharmacological agents. GPP
The risk of suicide in individuals with FRDA should be considered and managed proactively. GPP
8.3 Provision of wheelchairs and seating systems
Recommendations Grading
Prescription of a manual or powered wheelchair or scooter should be preceded by an assessment of the home/school/work and community environment the equipment will be used in. GPP
A comprehensive prescription of a manual or powered wheelchair or scooter should be completed by a qualified clinician familiar with the specific issues related to FRDA. GPP
A validated assessment and evaluation tool for wheelchair and seating prescription may be used to guide the process of prescription and evaluation. GPP
In prescribing a manual wheelchair and seating system, functional capacity should not be impeded for the sake of an anatomically correct seated posture. GPP
Appropriate training should be provided regarding the safe use of the wheelchair or scooter in the home or community environment. GPP
Suitability of the seating and wheelchair system should be evaluated on an annual basis in adults and bi-annually in children. GPP
8.4 Independence issues
Recommendations Grading
Individuals with FRDA may benefit from a detailed assessment identifying barriers to independence. GPP
Compensatory or remedial intervention may improve independence in individuals with FRDA. GPP
8.5 Advance care planning and end of life care
Recommendations Grading
Professionals should facilitate advance care planning and documentation of advance care directives in individuals with FRDA. GPP
Advance care directives documented for individuals with FRDA should be regularly reviewed by the individual in conjunction with their treating clinicians. GPP
8.6 Palliative care
Recommendations Grading
Neurology, rehabilitation and palliative care services should develop closely coordinated working links to support people with FRDA from diagnosis to death, including:
• proper flow of communication and information for patients and their families
• a designated point of contact for each stage in the pathway.
GPP
Individuals with FRDA and a limited lifespan (for example, likely to die within 12 months) and/or distressing symptoms, and/or a need for end-of-life planning generally benefit from a referral to a palliative care team. GPP
An individual identified as being in the process of dying from FRDA may benefit from ongoing access to palliative care services including symptom and pain control, psychological and spiritual support and specialist input if needed. GPP
9 Potential medications/compounds for use in Friedreich Ataxia
Recommendations Grading
As there are no proven treatments that alter natural history it is not recommended that any pharmaceutical agent be routinely prescribed to individuals with FRDA. A [64]-[67]
Idebenone is the most studied pharmacological agent in FRDA. Studies to date indicate the use of Idebenone in individuals with FRDA does not result in significant changes to neurological or cardiac status over an extended period of time. A [64],[65],[67]-[74]