Mod 8 Cystic Fibrosis Flashcards

1
Q

Cystic fibrosis [CF] is a life-limiting autosomal recessive genetic disorder;

  • caused by mutations in which pair of genes?
A

Autosomal recessive gene disorder that has mutations are located on Chromosome 7

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2
Q

Cystic fibrosis [CF] is responsible for production of which protein?

A

Cystic fibrosis transmembrane regulator [CFTR]

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3
Q

Why is Cystic fibrosis transmembrane regulator a problem?

A

prevents/regulates chloride and bicarbonate cross-membrane transport. leading to:

- abnormal electrolyte and water movement in and out of epithelial cells

  • problems w/water movement
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4
Q

Indicators of cystic fibrosis in infants

A

Development of meconium ileus; something about delay bowel movemnts?

  • big meconium that can’t pass through-
  • low birth weight; inability to absorb nutrients.
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5
Q

True or False:

  • males are infertile while females aren’t
A

True, males lack the vas deferens

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6
Q

insert slide 8

A
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7
Q

why is Cystic fibrosis only a 25% chance of being passed on by parents?

A

It is a recessive gene; offspring will either be carries or will require both parents will need to have a copy

  • 25% chance of no disease (or having it)
  • 50% of being a carrier
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8
Q

Describe the pathophysiology of Cystic fibrosis [CF] that causes problems

A

Airway surface liquid dehydration due to uncontrolled activity of epithelia sodium channels

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9
Q

Morbidity and mortality of CF pts is due to what?

A

Chronic airway infection, leading to irreversible end stage resp. failure.

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10
Q

Cystic fibrosis [CF] will be encountered by which routes?

A

Referral from paediatric clinics and new diagnosis in adult life

slide 11

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11
Q

CFTR malfunction results in what alterations in the lungs?

A

Build up of thick mucous in airways leading to resp. insufficiency.

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12
Q

In Cystic fibrosis [CF] what a causes bacterial colonization of the resp. tract?

A

A combo of decreased mucociliary clearance and an altered ion transport.

  • dehydration limits mucus covering cilia, and hence fluid movement
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13
Q

Cystic fibrosis [CF] common bacteria? slide 12

A

Pseudomonas aeruginosa

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14
Q

Impaired mucociliary clearance leads to small bronchi and broncioles becoming

A

partially or fully obstructed

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15
Q

Partial obstruction in bronchi lead to

A

overdistenion of alveoli

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16
Q

complete obstruction in bronchi leads to

A

atelectasis and bronchiectasis

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17
Q

Heterogeneity of lung function of Cystic fibrosis [CF] presents what symptoms in advance stages?

A

slide 13 + slide 14?

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18
Q

what other systems are affected by Cystic fibrosis [CF]?
- recall, CF is a systemic condition

A

GI tract (malabsorption)
- fat solvable vitamin deficiency (a,d,e,k(

Recurrent pancreatic

Gerd

Increased risk of Chrons disease

Constipation

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19
Q

What are common clinical scenarios in late Cystic fibrosis [CF]? (5)

A
  • Recurrent chest infections
  • widespread bronchiectasis
  • poorly controlled asthma
  • Nasal polyps, severe chronic rhinosinutis
  • electrolyte distrubances
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20
Q

For pathway and responses for management; refer to charts one slide 16-18 for early -> advanced stages

A
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21
Q

Diagnosis of Cystic Fibrosis [CF] is based on what clinical findings?

A

Sweat chloride test = gold standard

  • both clinical and functional criteria must be met to diagnose CF
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22
Q

Clinical indicators of Cystic Fibrosis [CF] in the pulmonary system?

A
  • wheezing
  • chronic cough
  • sputum collection
  • freq. resp. infections
  • nasal polyps
  • abnormal CxR [obst/restrictive proccess]
  • parainsuitis
    -digital clubbing
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23
Q

Clinical indicators of Cystic Fibrosis [CF] in the GI system?

A

slide 21

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24
Q

Sweat chloride test interpretation in infants 6 months or younger

A
  • ≤29 mmol/L: Normal (CF very unlikely)
  • 30-59mmol/L: Intermediate (Possible CF)
  • ≥60 mmol/L: Abnormal (Diagnosis of CF
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25
Q

Sweat chloride test interpretation in infants older than 6 months and adults

A
  • ≤39 mmol/L: Normal (CF very unlikely)
  • 40-59mmol/L: Intermediate (Possible CF)
  • ≥60 mmol/L: Abnormal (Diagnosis of CF)
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26
Q

What is a Nasal potential difference?
- hint it’s a diagnostic tool
edit

A

Impairment of sodium and chloride across the epithelial cells lining the airways of CF pts measurement

As sodium moves across the epithelial cell membrane; they generate electrical potential diff.

  • the energy required to move an electrical charge from 1 point to another.
  • measuring the difference is the nasal potential difference
27
Q

How do you interpret the Nasal potential difference?

A

An increased in nasal potential difference [more negative] strongly suggests CF

28
Q

Add slide 24 - 26

A
29
Q

If both parents test positive for CF, what are the chances their children will have CF?

A

1 in 4 chance

30
Q

Testing CF in newborn babies involves pricking the heel of babies, what is screened from their blood work?

A

Immuonoreactive trypsinogen (IRT)

31
Q

What is the following CxR?

A

Cystic fibrosis

32
Q

What can you expect to see on a CxR for cystic fibrosis?

A

**- Pulmonary Hyperinflation/expansion

  • large main pulmonary artery segments **

From google:

  • peribronchial thickening and dilatation,
  • peribronchial cuffing
  • mucoid impaction
  • cystic radiolucencies,
  • increase in interstitial marking, and scattered nodular densities
33
Q

Is cystic fibrosis obstructive or restrictive?

A

Obstructive

34
Q

What gene is altered in CF

A

Chromosome 7
- autosomal recessive disorder (2 r alleles)
- Most common mutation is DeltaF508

35
Q

What happens to Fluid transport in CF?

A

The transport channels are stop working properly and creates a massive secretion production

36
Q

First indications of CF

A

Myconium ileus
Failure to thrive
Foul smelling stools
GI issues

90% noticed within first 2 wks of birth

37
Q

Common bacteria that can build up because of CF?

A
  1. Pseudomonas aeruginosa
  2. Hemophilus influenza
  3. Staphylococcus auerus
38
Q

What happens in airways because of CF?
- what happens to unchecked/treated CF?

A

** - Impaired mucociliary clearance leads to: increased mucous production (thick!!!!)**

  • small bronchi and bronchioles become partially/fully obstructed.
  • Check-valve phenomenon

Can lead to atelectasis and bronchiectasis with complete obstructions

38
Q

What happens in airways because of CF?
- what happens to unchecked/treated CF?

A

** - Impaired mucociliary clearance leads to: increased mucous production (thick!!!!)**

  • small bronchi and bronchioles become partially/fully obstructed.
  • Check-valve phenomenon

Can lead to atelectasis and bronchiectasis with complete obstructions

39
Q

What happens in airways because of CF?
- what happens to unchecked/treated CF?

A

** - Impaired mucociliary clearance leads to: increased mucous production (thick!!!!)**

  • small bronchi and bronchioles become partially/fully obstructed.
  • Check-valve phenomenon

Can lead to atelectasis and bronchiectasis with complete obstructions

40
Q

CF causes impaired mucociliary clearance leads to: increased mucous production; what can happen if secretions aren’t cleared?

A
  • small bronchi and bronchioles become partially/fully obstructed.
  • Can lead to atelectasis and bronchiectasis with complete obstructions
41
Q

What are other body symptoms of CF?
- Think systemically and not specific to airways

A
  • malabsorbition
  • GERD
  • increased risk of Chrons disease
  • Constipation
42
Q

GOLD standard diagnosis of CF

A

Sweat chloride test

43
Q

GOLD standard diagnosis of CF

A

Sweat chloride test

44
Q

Infant sweat chloride for possible CF
- Think numerical range

A

30-59mmol/L

45
Q

Infant sweat chloride for confirmed CF

A

> 60mmol/L

46
Q

Adult sweat chlorde for possible CF

A

40-59mmol/L

47
Q

adult sweat chloride for diagnosis of CF

A

same as infant, >60mmol/L

47
Q

adult sweat chloride for diagnosis of CF

A

same as infant, >60mmol/L

48
Q

Early management of CF

A

** - Mucous clearance (CPT, mucolytics)**
- Prevent infection (vaccinations)

  • Symptomatic relief ( SABA as needed)
  • Eradication of infection (high dose antibiotics
49
Q

Intermediate management of CF

A
  • Suppression of bacterial load (inhaled antibiotics)
  • Exacerbations (oral or IV antibiotics)
  • Reduce inflammation ( long term azithromycon)
  • Prevent reoccurance (OCS)
  • rhDNase (mucolytic- pulomaze)
50
Q

Advanced management of CF

A
  • Halt hemoptysis (tranexamic acid)
  • Pneumothorax ( tube drainage or pleurodesis if recurrent)
  • End-stage respiratory failure- reduce airway inflammation ( LTOT, optimize tx, referral for lung transplant)
51
Q

Advanced management of CF

A
  • Halt hemoptysis (tranexamic acid)
  • Pneumothorax ( tube drainage or pleurodesis if recurrent)
  • End-stage respiratory failure- reduce airway inflammation ( LTOT, optimize tx, referral for lung transplant)
52
Q

Nasal potential difference?
- What does a negative potential difference mean?

A

A measurement of the voltage across the nasal epithelial cell determined by using a high impedance voltmeter between two electrodes.

- More negative potential difference confirms CF

53
Q

Nasal potential difference?
- What does a negative potential difference mean?

A

A measurement of the voltage across the nasal epithelial cell determined by using a high impedance voltmeter between two electrodes.

- More negative potential difference confirms CF

54
Q

Why is Tobramycin relevant for CF?
- hint its a antibiotic

A

Inhaled antibiotic

used in treatment if Pseudomonas aeruginosa for CF

55
Q

CxRs for CF typically have what traits?

A

hyperinflation of lungs
large main pulmonary artery segments

56
Q

Immunoreactive protein testing is usually peformed for CF:

  1. When is it done?
  2. Are high or low values normal?
A
  1. usually done a few days after birth.

2.high number is normal for CF patients

57
Q

Clinical indicators/ symptoms of CF

A

Wheezing
Chronic cough
Sputum production
Frequent respiratory infections
Abnormal CXR
Nasal polyps

GI: Failure to thrive, GI issues, unable to tolerate milk…etc

58
Q

What is Pleurodeisis?

A

A procedure where the lungs are forced against the thoracic cavity.

Purpose
- pushes out any air/fluid out of the pleura

59
Q

Recurrent pneumothoraces and pleural effusions are typical problems associated with Cystic Fibrosis. What treatment can be considered with these recurrent issues?

A

Pleurodesis

60
Q

True or False:

Inhaled antiobiotics, such as tobramycin, are used to treat and prevent the recurrance of fungal infections in patients with Cystic Fibrosis

A

False; Tobramycin is a antibiotic, not fungal.

61
Q

What purpose is Pulmozyme, an rhDNase, used in the treatment of Cystic Fibrosis?

A

To assist in bronchopulmonary hygiene

(helps clear mucous secretions)