breathing basics and care choices for sma type i · pdf filebreathing basics and care ......
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Breathing Basics and Care
Choices
for SMA Type I
2015 Annual Cure SMA Conference Westin Hotel – Kansas City, MO
June 18-21, 2015
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PRESENTERS
• Mary Schroth MD University of Wisconsin School of Medicine and Public Health
American Family Children’s Hospital
Madison, Wisconsin
• Richard Shell MD The Ohio State University
Nationwide Children’s Hospital
Columbus Ohio
• Richard Kravitz MD Duke University School of Medicine
Duke University Medical Center
Durham, North Carolina
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Encompasses:
•Diagnosis
• Respiratory Care
• GI and Nutrition
•Orthopedic Concerns
• Palliative Care
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SMA MYTHS
• You have no hope
• You have no choices
• There is nothing you can do
• Your child is going to die
• You have no support
• A tracheostomy is a sign of failure
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SMA FACTS
• Treatment options are available (though they may be labor intensive and are more supportive, not curative)
• Children with SMA of all types are doing better than ever before
• There is currently no cure, but research is underway and therapies might yet be on the horizon
• A tracheostomy represents just another a treatment modality
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Results of Respiratory Muscle Weakness
in SMA
1. Difficulty coughing
2. Small shallow breaths during sleep:
hypoventilation
3. Chest wall and lung underdevelopment
4. Recurrent infections that contribute to muscle
weakness.
Wang C et al, J Child Neurol 2007; 22:1027.
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Other Complications of Neuromuscular
Weakness
• Scoliosis
– Alters chest wall shape
• Gastroesophageal reflux and aspiration
• Constipation
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Chest Wall Changes
Normal SMA II Normal SMA I
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Normal breathing
REM related
sleep disordered
breathing
NREM and REM
sleep disordered
breathing
Daytime ventilatory failure
Chest infections
Ineffective cough
reduced peak
cough flows
Respiratory and bulbar muscle weakness
Physical examination
Chest xray,
Sleep study
Airway
clearance with
cough
assistance
Swallow dysfunction Swallow function
evaluation
Nocturnal
non-invasive
ventilation
Nocturnal or
continuous
non-invasive
ventilation
Pulmonary function, peak
cough flow, respiratory
muscle strength
Death
Assessment Natural History Intervention
SMA Pulmonary Natural History
Wang C et al, J. Child Neurol 2007; 22:1027.
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FRC Relative to Position for
Diaphragm Dependent Breathers
From Nunn’s Applied Respiratory Physiology, 2000
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IMPACT OF MUSCLE WEAKNESS
• Scoliosis
curvature of the spine
• Restrictive lung disease decreased lung volumes
• Weakened cough
• Increased risk of aspiration
and gastroesophageal reflux
• Atelectasis
mucus plugging
• Pneumonia
• Hypoventilation inadequate breathing while
asleep/awake
• Obstructive sleep apnea
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CAUSES OF RESPIRATORY PROBLEMS
• Inadequate cough
Retained secretions
Mucus plugging
Atelectasis
Hypoxia (low O2)
Respiratory distress
Respiratory failure
• Infection
• Inadequate ventilation Hypoxia (low O2)
Hypoventilation
Respiratory distress
Respiratory failure
• Cough and Ventilation Worsen With Respiratory Illnesses!
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METHODS TO ASSESS RESPIRATORY
MUSCLE FUNCTION
• Pulmonary function testing
Spirometry
Lung volumes
• O2/CO2 analysis
Blood gas (arterial, venous, capillary)
Pulse oximetry (SaO2)
Capnography (EtCO2)
• Maximal respiratory pressures
Maximal Expiratory Pressure
Maximal Inspiratory Pressure
• Cough Peak Flow
• Chest x-ray
• Overnight oximetry/capnography
• Polysomnogram (sleep study)
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FACTORS AFFECTING SECRETIONS
• Quantity of secretions
Normal versus increased amount
Ability of cough to remove a usual amount of secretions
• Quality of secretions
Normal (watery) versus sticky
Infection (viral versus bacterial)
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INTERVENTIONS TO AID AIRWAY CLEARANCE
• Secretion mobilization (non-pharmacologic)
– Manual chest physiotherapy
– Intrapulmonary percussive ventilation (IPV)
– High frequency chest wall oscillation (Vest therapy)
– (bronchoscopy)
• Mucociliary clearance (pharmacologic)
– Albuterol; hypertonic saline 3 or 7%; Pulmozyme
• Cough augmentation
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SECRETION MOBILIZATION Non-pharmacologic
• Helpful in SMA
Manual chest physiotherapy
High frequency chest wall oscillation (Vest therapy)
Intrapulmonary percussive ventilation (IPV)
(Bronchoscopy)
• Less helpful in SMA
Positive Expiratory Pressure
Acapella
Flutter
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Postural Drainage
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COUGH MECHANISM
3 Phases of a cough
1. Inspiratory phase
2. Closure of vocal cords/contraction of expiratory muscles
3. Opening of the vocal cords
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FACTORS IMPAIRING A COUGH
• Inadequate inhale (need to get to 85-90% of Lung Capacity)
Inherent muscle weakness
Muscle fatigue
Scoliosis
Chest wall stiffness
• Incomplete closure of throat and vocal cords Not usually a SMA problem unless a tracheostomy is needed
• Inadequate exhale (need cough flow rate > 6L/min)
Same problems with inspiration
PLUS
Diminished Inspiratory Capacity → Mechanical disadvantage • Muscles not at point of maximal capacity for active contraction
• Lung not at point of maximal (passive) elastic recoil
• Airway diameter not fully maximized
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MECHANICAL IN-EXSUFFLATOR
(THE COUGH ASSIST)
• Well tolerated: No gastroesophageal reflux or aspiration No pneumothorax (collapsed lung)
• Main complaints: “I just don’t like it!”
Interface discomfort Pressures uncomfortable Chest/abdominal discomfort No perceived benefit
• Most effective when used regularly (versus only when ill)
Takes some practice, but few complaints Once used to it, most kids will start to ask for it when ill!
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Machine for Coughing
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and right upper lobe density
Chest radiograph of 22-month-old
with SMA type I
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THE COUGH ASSIST
• Settings for use: – Inspiratory:
• visually good lung expansion (up to +40 cm H2O)
• Over 1-2 seconds
– Expiratory: • start at -25 cm H2O (up to -40 cm H2O)
• Over 1-2 seconds
– Pause:1-2 seconds between cycles
• Number of cycles: – 3-5 breaths/cycle
– 3 to 5 cycles per treatment (as tolerated)
• Frequency of use: – When well: once daily to twice a day (as needed)
– When ill: as often as necessary
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THE COUGH ASSIST
• Have suction available to help patient expectorate sputum (try to avoid deep suctioning)
• Various interfaces acceptable (full face mask; mouth piece; endotracheal tube; tracheostomy tube)
• Observe for transient O2 desaturations with use (suggests mucus mobilization)
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OTHER FACTORS AFFECTING
AIRWAY CLEARANCE
Nutrition Obesity Malnutrition
Sleep
Hypoventilation Obstructive sleep apnea
Aspiration
Video Swallowing Study
Gastroesophageal reflux
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ASPIRATION-RELATED FACTORS
• Aspiration Impaired swallowing
Impaired protective reflexes
Gastroesophageal reflux
• Gastroesophageal reflux Decreased lower esophageal muscle tone
Scoliosis can make the esophagus pass through the diaphragm at a bad angle, leading to reflux
Poor stomach emptying
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ASPIRATION-RELATED FACTORS
TREATMENTS SPIRATION
• Modified feeding plan Speech therapy input
Thickened feeds
Tube feeding
• Drying agents Glycopyrrolate (Robinul)
Botulism toxin injections
REFLUX
• Thickened feeds
(if oral feeds are tolerated)
• Acid Blockers H2 blockers
Proton pump inhibitors
• Surgery Gastrostomy tube +/- Nissen
fundoplication
Parotid duct ligation
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RESPIRATORY SYMPTOM PROGRESSION
• Normal (asymptomatic)
• Weakened cough Usually adequate when well
Problems develop with infections
Can lead to (recurrent) pneumonia/bronchitis
• Nighttime symptoms
• Daytime symptoms
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RESPIRATORY INTERVENTION PROGRESSION
• Normal (asymptomatic) – No treatment needed
• Weakened cough – Assist in airway clearance (required with viral illnesses)
• Assisted cough
• Chest physiotherapy
– May require ventilation (if low O2 levels or in respiratory distress)
• Nighttime symptoms – BiPAP or volume ventilator when asleep
• Daytime symptoms – Continuous ventilation
– Non-invasive ventilation versus tracheostomy (in select patients)
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Pulse Oximetry
• Normal is ≥ 95% or greater
• < 95% suggests:
Mucus plugging (needs more airway
clearance)
Shallow breathing (awake and/or asleep)
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Breathing Support Approaches
• Non-invasive ventilation
BiPAP or Ventilator
Interface: Mask over the nose
• Invasive ventilation
Ventilator
Interface: Tracheostomy
• Comfort Care (as part of Palliative Care)
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GOALS OF VENTILATORY SUPPORT
• Improve oxygen and carbon dioxide levels
Ventilation and Oxygenation
• Muscle rest
• Treatment of pectus excavatum
• Compensate for worsening strength when having a respiratory illness
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Non-Invasive Positive Pressure
Ventilation Devices
Bi-level positive airway pressure (BiPAP)
Home ventilator
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BREATHING ASSIST (Interfaces)
• Non-invasive Ventilation • Invasive Ventilation
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POSTITIVE PRESSURE VENTILATION:
Advantages of positive pressure VENTILATION:
Advantages of the Non-Invasive Route of the Non-Invasive
Route
• Advantages
– Non-invasive
– Reversible
– Safe
– Effective
– Preserves (natural) airway
protection mechanisms
– Decreased risk of infection
– Comfort
– Preserves speech
– Less swallowing issues
• Disadvantages – Lack of access to airway for
deep suctioning
– Aerophagia
– (worsened reflux)
– Facial injury
– Facial bone remodeling
from tight fitting mask
– Increased oral secretions
– Requires cooperation of the patient
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NIPPV COMPLICATIONS
• Nasal/oral dryness
• Epitaxis
• Nasal congestion
• Sneezing
• Rhinorrhea
• Sinusitis
• Claustrophobia
• Mask irritation
• Nasal abrasions
• Aerophagy
• Mouth leak
• Facial deformities
• (Decreased cardiac output)
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INVASIVE RESPIRATORY CARE
• Intubation (in an acute illness)
• Tracheostomy with ventilator support
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TRACHEOSTOMY: Indications
• NIPPV no longer effective at treating hypoventilation
• NIPPV not tolerated by the patient
• Excessive oral secretions puts patient at risk for aspiration
• Care for patient with NIPPV beyond the capabilities of the family
• Resources for outpatient management with NIPPV not available in the community
• Failure to extubate a patient who has been intubated (for what ever reason). This assumes proper methods of extubation were employed
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TRACHEOSTOMY: Advantages for the Patient
• Allows for assisted ventilation
• Airway is protected from aspiration
• Increased ease in suctioning excessive secretions (if needed)
• No NIPPV mask pressure sores or facial remodeling
• Treats obstructive sleep apnea (if present)
• In select cases, may be a temporizing measure until extubation is possible
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TRACHEOSTOMY: Advantages for Family
• Freedom – night out for the parents
– more mobility • getting to doctor’s office/hospital
• shopping
• vacations
• Increased support in the home – more skilled nursing care
– more nursing aid hours
– (make sure you have a good case manager)
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TRACHEOSTOMY:
Disadvantages
• Unsightly
• Diminished cough
• Risk of infection
• Secretions
• Speech problems
– trouble understanding child
– never develop speech
– loose ability to speak
• Dysphagia
• Bradycardia
• Desaturations
• Loss of airway (if the tube comes out)
• Increased hospitalizations
• Suprastomal damage • granulation tissue
• airway collapse
• Subglottic damage • granulation tissue
• tracheomalacia
• tracheomegaly
• tracheal erosions
• fistula formation
• subglottic stenosis
• Bleeding • suction catheter trauma
• arterial erosion
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TRACHEOSTOMY: Quality of Life Issues
• The family unit – limited data (especially with children)
– the perspective varies: • the patient
• the parents
• the siblings
• The medical team – health care providers ≠ the family
– health care providers frequently underestimate the patient’s quality of life!
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KEY POINTS REGARDING A TRACHEOSTOMY
• Elective tracheostomy is better than emergency
tracheostomy
• Long-term treatment plan is best determined in
times of health. The middle of an acute
decompensation (especially one which was
predictable) is not the best time to be making
these types of decisions
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PALLIATIVE CARE
• Recognizes that SMA Type I is a life threatening disease
• Should be part of the care of the disease process
• Goals
Provide symptom relief: pain, dyspnea, agitation, nausea, anxiety
Provide psychological, social and spiritual support for patient and family
• Palliative care can be in the hospital, in the home, or both
• Palliative care is not giving up; it is just changing the focus of therapy
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HOW THE COMMON COLD MAKES
CHILDREN WITH SMA SICK
• Increased secretions Worsening of (already impaired) swallowing function
Increased risk of aspiration
• Weakened cough Diminished ability to clear secretions
Increased risk for mucus plugging, atelectasis, and pneumonia
Hypoxia
• Further weakening of muscle strength Vicious cycle leading to more aspiration and further weakening
of an already diminished cough
Higher risk for inadequate nighttime breathing and hypoxia
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HOW TO TREAT THE COMMON COLD
• Treat the increased secretions Good hydration
Suctioning (if necessary)
Avoid drying agents/anti-histamines (if possible)
• Treat the weakened cough Increased use of cough assisting maneuvers (i.e.: the Cough Assist)
You can do this as often as needed (up to every 10-15 minutes)
Maintain normal oxygenation (SaO2 ≥ 95%) Avoid supplemental O2!
Assisted ventilation may be needed
Judicious use of antibiotics
• Treat the worsened muscle strength The patient may require increased use of NIPPV (both while awake and
asleep)
Watch out for worsening nocturnal hypoventilation
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ISSUES TO ADDRESS AT
FOLLOW UP APPOINTMENTS
• Pulmonary
• Sleep
• GI status
• Well child care
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WELL CHILD CARE
• Routine health care
• Immunizations Usual immunization
Influenza vaccination
Pneumococcal vaccination
Palivizumab (Synagis)
• Proper nutrition Obesity versus malnutrition
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EQUIPMENT RECOMMENDED
FOR THE HOME
• Mechanical in-exsufflator (The Cough Assist)
• Ambu bag
• Pulse oximeter
• Chest cups or high frequency chest wall oscillation (if needed)
• Suctioning equipment
• Nebulizer (if needed)
• BiPAP or volume ventilator (when needed)
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CHOICES
• Children with SMA type I are very weak in the
first year of life and their prognosis is not clear
• Children with SMA type 1 are at great risk for
poor cough and hypoventilation
• Not all interventions fit every child
• You will make the best decisions for your child
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WHEN THE WHEN THE OPTIONS ARE LIMITED
• Families often have the difficult position of choosing the option they believe is best for their child and their family
• Because there are no right or wrong choices, you must trust in yourselves that you will make the right decision
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MULTIDISCIPLINARY
HEALTH CARE TEAM
• Pulmonologist
• Neurologist
• Cardiologist
• Orthopedist
• Sleep physician
• 1o Care physician
• Nursing
• Nutritionist
• Respiratory therapist
• Physical therapist
• Occupational Therapist
• Speech Therapist
• Social work
• Palliative care
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THINGS TO REMEMBER
• Every child is unique
• You are your child’s best advocate
• The decisions you make regarding your child’s care are the correct ones for your family
• You are part of team caring for your child (actually, you are the captain, so the call is yours), but don’t be afraid to ask for input and be open to your health care team’s recommendations
• You are not alone. There are many support groups out there to help you.
• Get involved!
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REMEMBER, ANYTHING IS POSSIBLE…
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SMA Conference Survey
Please complete your conference
survey at this link: https://www.surveymonkey.com/s/2015AnnualSMAConfere
nce
Or fill out the paper survey in your conference folder.
All participants who complete the survey will receive a raffle
ticket to win an IPad! Winner will be announced on
Sunday, June 21st at the Closing General Session.