Author: Richard H. Simon, M.D., 2008-2010 · 2016. 10. 11. · Slide 10: Source Undetermined Slide...
Transcript of Author: Richard H. Simon, M.D., 2008-2010 · 2016. 10. 11. · Slide 10: Source Undetermined Slide...
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Cystic Fibrosis
Richard H. Simon Pulmonary and Critical Care Medicine Department of Internal Medicine
Fall 2008
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Objectives
Understand: The genetic nature of cystic fibrosis (CF) The pathophysiology of CF lung disease
Know how to diagnose CF
Learn the basic approach to treating CF lung disease
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Cystic Fibrosis Inherited disease
Autosomal recessive
Gene cloned in 1989: “CFTR” Cystic Fibrosis
Transmembrane conduction Regulator
1601 mutations in CFTR known to cause CF
An extensive amount of information is known about CFTR
Science, September 1989
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Schematic Representation of CFTR
Genetic Disorder Research Project Wiki Site
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Pathophysiology of CF
CFTR Dysfunction
Disease manifestations
Lungs
Sinuses
Pancreas
Liver
Bones
Vas deferens
?
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Airway Cross Sectional View
Knowles & Boucher 2002;109:571
Epithelial cell layer
Mucus layer Pericellular layer
with cilia
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Required Geometry for Effective Mucociliary Clearance
Knowles & Boucher 2002;109:571
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Pathophysiology of CF Lung Disease
Source Undetermined
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Consequences of CFTR Deficiency on Airway Clearance
Knowles & Boucher 2002;109:571
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Pathophysiology of CF Lung Disease
CF Gene Mutation
Ion Transport Abnormalities
Altered Airway Environment
Inflammation Infection
Tissue Damage
R. Simon
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Pathophysiology of CF Lung Disease
Bronchiectasis
Death
Chronic Respiratory Failure
CF Gene Mutation
Recurrent Bronchitis
Source Undetermined
R. Simons
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Prevalence of Infections in CF Patients
0
20
40
60
80
100
0 to 1 2 to 5 6 to 10 11 to 17 18 to 24 25 to 34 35 to 44 45+
Age (years)
Perc
ent
Cystic Fibrosis Foundation Patient Registry Data. 2005
P. aeruginosa
S. aureus
MRSA
H. influenza
S. maltophilia B. cepacia
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Natural History of CF Lung Infections
Ps. aeruginosa or B. cepacia complex species persist in the lung
True infection, not “colonization” Difficulty in eradicating infection:
Intrinsic antibiotic resistance Acquired antibiotic resistance Poor antibiotic penetration into secretions Alginate produced by mucoid Ps. (biofilms) CF-related defects in mucosal (but not systemic)
defenses
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Diagnostic criteria for cystic fibrosis Part 1: Clinical Manifestation of Disease
At least one of the following: 1) One or more clinical manifestations of CF
Meconium ileus Chronic bronchitis / bronchiectasis Chronic infection of the paranasal sinuses Pancreatic insufficiency Salt loss syndromes Male infertility due to congenital bilateral absence of the
vas deferens
2) Positive newborn screening test 3) History of CF in a sibling
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Diagnostic Criteria for Cystic Fibrosis Part 2: Laboratory evidence of CFTR abnormality
At least one of the following: 1) Elevated sweat chloride test
2) Identification of a mutation in each CFTR gene known to cause CF
3) In vivo demonstration of characteristic abnormalities in ion transport across nasal epithelium (not widely available)
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Sweat Test for Diagnosis of CF
0 20 40 60 80 100 120 140 160 180
mEq/L
0
300
600
900
1200
1500
1800
0
600
120
180
240
Num
ber o
f nor
mal
con
trol
s
Num
ber o
f pat
ient
s w
ith C
F
Controls n=4269
CF n=920
Shwachman H, Mahmoodian A. Mod Prob Pediatr 1967;10:158
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Use of Genotyping to Diagnose CF
1601 CFTR mutations known to cause CF
Only 25 mutations have a frequency > 0.1%
Frequency, % 0 10 20 30 40 50 60 70
R347P 3849+10kbC → T
Δ I507 R117H
R1162X 1717-1G → A
R553X 621+1G → T
W1282X N1303K G551D G542X ΔF508
CF Genetic Analysis Consortium
Population Frequency of Specific CFTR Mutations Causing CF
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Genotyping for CF Diagnosis
Current commercial screening tests
Look for presence of between 25 - 100 mutations
These will detect a CF allele only ~90% of time
For a group of patients with known CF, genotyping would be diagnostic in only ~81% of patients
∴ Screening for most common mutations is not as sensitive as sweat testing (98%) to diagnose classic CF
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Genetic Diagnosis of CF
Tests becoming commercially available for detecting mutations more broadly PCR used to amplify all exons and
surrounding splice sites Heteroduplex formation screening and/or
sequencing Analysis for large deletions and duplications Cost ~ $2,500
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Acute Exacerbations of CF Lung Disease
Symptoms Increased cough with sputum production Hemoptysis Increased shortness of breath Fever (not required) Reduction in FEV1 Worsening infiltrates on chest x-ray (not
required)
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Acute Exacerbations of CF Lung Disease
Antibiotic treatment Oral antibiotics
If symptoms are mild, and Bacteria are susceptible
Intravenous antibiotics otherwise
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Management of Chronic Lung Disease in Cystic Fibrosis
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Aerosolized Antibiotics
High dose tobramycin proven for chronic infection TOBI® 300 mg in 5 ml bid every other month
Ramsey B, et al. NEJM 1999;340:23-30
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Mucolytic Therapy for CF
DNase (Pulmozyme ®) Chronic use improves FEV1 and causes fewer exacerbations
Fuchs HJ, et al. NEJM 1994;331:637-642
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Bronchodilators in CF
No studies in acute exacerbations but routinely given
Chronic use -- FEV1 improves acutely in some patients β-adrenergic agonists (e.g. albuterol,
salmeterol) Anticholinergic agents (ipratroprium bromide,
tiotroprium)
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Anti-Inflammatory Treatment in CF
Glucocorticoids Oral (prednisone)
Preserves lung function, but too many adverse effects
Inhaled Used for subgroup of with bronchial hyperreactivity
(asthma) symptoms
Ibuprofen Beneficial for young patients No evidence for improvement in adults
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Macrolide Therapy for CF
Azithromycin in CF Improved FEV1 Fewer exacerbations of
CF lung disease Uncertain mechanism
of action Anti-inflammatory? Bacterial toxin or
biofilm production? 0 4 12 24 28
-4
-2
0
2
4
5
Study Week
Azithromycin
Placebo
1
-1
-3
3
Cha
nge
in F
EV1 (
% p
redi
cted
)
8 16 20
Saiman L, et al. JAMA. 2003;290:1749-56
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Nebulized Hypertonic Saline (7%)
Elkins MR et al. N Engl J Med 2006;354:229-240
Effect on FEV1 Randomized, double-
blind, placebo controlled trial
N = 164 Inhalation of 4 ml of 7%
vs. 0.9% saline bid for 48 weeks
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Effect of 7% Saline on Frequency of Pulmonary Exacerbations
Elkins MR et al. N Engl J Med 2006;354:229-240
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Physiotherapy for CF
No studies in acute exacerbations But “standard of care” treatment
Beneficial for chronic management
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Physiotherapy Options for CF
• Flutter
• Acapella
• PEP
• Vest
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Supplemental Oxygen
Use same guidelines as COPD
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Home Versus Hospital Therapy for Acute Exacerbation
Home regimen must duplicate full hospital program IV drugs Physiotherapy Nutrition Et cetera
Results from small studies showed mixed results
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Assisted Ventilation in CF
Past studies show very poor outcomes
Non-invasive ventilation being used as a bridge to lung transplantation
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Lung Transplantation CF
Bilateral lung transplantation
Outcome similar to non-CF transplantation
Problems Long waiting lists Many exclusions
Living donor transplants
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5 6 13
55 53
92 104
146 137 153
135 131
151 142 134 141
178
161
0 20 40 60 80
100 120 140 160 180 200
88 89 90 91 92 93 94 95 96 97 98 99 00 01 02 03 04 05
Num
ber o
f Tra
nspl
ant P
atie
nts
Year
Number of CF Patients With Lung Transplants 1988 - 2005
Source Undetermined
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Median Predicted Survival for Cystic Fibrosis
0
5
10
15
20
25
30
35
1940 1950 1960 1970 1980 1990 2000 Calendar Year
Age
, yr
Source Undetermined
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New Therapies for CF Under Development – September 2007
Source Undetermined
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Cystic Fibrosis 1989
Clip of Identification of the Cystic Fibrosis Gene:
Chromosome Walking and Jumping from Science,
September 1989, removed
Science, September 1989
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Cystic Fibrosis Now
Image of Dan Bessette, the child from the September 1989 cover of Science, a 19 year old college
sophomore in 2003
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References
Simon RH. Treatment of CF lung disease. UpToDate, 2008.
Davis P. Cystic Fibrosis Since 1938. Am J Respir Crit Care Med 2006;173: 475-482.
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Additional Source Information for more information see: http://open.umich.edu/wiki/CitationPolicy
Slide 5: Science, September 1989 Slide 6: Genetic Disorder Research Project Wiki Site, http://runkle-science.wikispaces.com/Cystic+Fibrosis
Slide 8: Knowles & Boucher 2002;109:571
Slide 9: Knowles & Boucher 2002;109:571 Slide 10: Source Undetermined
Slide 11: Knowles & Boucher 2002;109:571
Slide 12: R. Simon
Slide 13: Source Undetermined; R. Simon
Slide 14: Cystic Fibrosis Foundation Patient Registry Data. 2005 Slide 18: Shwachman H, Mahmoodian A. Mod Prob Pediatr 1967;10:158
Slide 19: CF Genetic Analysis Consortium
Slide 25: Ramsey B, et al. NEJM 1999;340:23-30
Slide 26: Fuchs HJ, et al. NEJM 1994;331:637-642
Slide 29: Saiman L, et al. JAMA. 2003;290:1749-56
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Slide 41: Science, September 1989