Asthma and Eczema Flashcards

1
Q

Ipratopium, tiotropium, glycopyrronium, aclidinium are all examples of what class of medications? Used to treat what?

A
  • Anti-muscarinics

- used as bronchodilators to treat asthma or COPD

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2
Q

MOA of anti-muscarinics e.g. Ipratopium, tiotropium

A
  • bind to muscarinic receptor
  • act as a competitive inhibitor of acetylcholine
  • by blocking the ‘rest/digest’ enzymes they have effects of: increased HR and conduction, reduced SM tone, reduced secretions from resp and GI tract glands and pupil dilation
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3
Q

Name 2 SEs of anti-muscarinics e.g. Ipratopium, tiotropium

as inhaled SEs are pretty minimal vs oral/IV preparations

A
  • irritation of resp tract: nasopharyngitis, sinusitis and cough
  • GI disturbance: dry mouth, constipation
  • Urinary retention
  • blurred vision
  • headaches
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4
Q

In what conditions/pts susceptible to what, should the use of anti-muscarinics like Ipratopium, tiotropium be prescribed with caution?

A
  • angle-closure glaucoma (can precipitate a rise in ICP)
  • pts at risk of arrhythmias
  • pts in urinary retention
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5
Q

Name one short acting anti-muscarinic and suggest dose and frequency vs
one long acting anti-muscarinic and frequency of administration?

A
  • short acting e.g. Ipratopium 4x daily/PRN when breathless e.g. 40micrograms (in an attack up to 500micrograms)
  • long acting e.g. tiotropium, glycopyronium, aclidinium, prescribed once/twice daily
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6
Q

Name 3 examples of B2-agonists

used to treat asthma, COPD and which electrolyte disturbance?

A
  • salbutamol, terbutaline, salmeterol, formoterol, indacaterol
  • hyperkalaemia
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7
Q

SABAs are used to relieve ___ in asthma, and LABAs are used as treatment for ___ asthma when inhaled ___ alone are insufficient.

A
  • relieve SOB
  • LABAs for chronic asthma
  • when inhaled ICS alone..
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8
Q

MOA of B2-agonists

A

-B2 receptors exist in: SM of bronchi, gut, uterus and vessels
-stimulation of these GPCRs activates a cascade –> SM relaxation
-this improves airflow in constricted airways, reducing SOB
(also stimulate Na+/K+ ATPase so shift K+ from extra to intracellular compartment)

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9
Q

Of the following B2-agonists, which are short acting (SABAs) and which are long-acting (LABAs)?
-salbutamol, terbutaline, salmeterol, formoterol, indacaterol

A

SABAs: -salbutamol, terbutaline
LABAs: -salmeterol, formoterol, indacaterol

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10
Q

B2-agonists, name 3 side effects of this medication class:

A
  • ‘fight/flight’ SEs of:
  • tachycardia
  • palpitations
  • anxiety
  • tremor
  • promote glycogenolysis so can increase blood glucose (at high levels serum lactate may rise)
  • LABAs can cause muscle cramps
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11
Q

LABAs should only be used in asthma alongside an ___ __ as part of therapy, because without this LABAs are associated with what?

A
  • inhaled corticosteroid

- with increased asthma deaths

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12
Q

Thinking about the fight/flight side effects of B2-agonists, what co-morbidity would you exercise caution in when prescribing?

A

-pts with CV disease (tachycardia may promote angina/arrhythmias)

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13
Q

Common dose for adult asthma reliever B2-agonist is:

A

-Salbutamol 100-200 micrograms inhaled as required (PRN)

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14
Q

When prescribing nebuliser therapy, you must always indicate if it should be driven by __ or by __.
In general, __ should be used in asthma whereas medical ___ should be used in COPD due to the risk of ___ ____.

A
  • by oxygen or air
  • oxygen should be used in asthma
  • medical air in COPD
  • due to risk of CO2 retention
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15
Q

Name 2 inhaled corticosteroids
Explain the indications in both
-asthma
-COPD

A
  • beclometasone, budesonide, fluticasone
  • asthma: treats airway inflamm/symptom control when SABA alone is inadequate
  • COPD: to control sx and prevent exacerbations in pts with severe airflow obstruction and/or recurrent exacerbations
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16
Q

What helpful effects do inhaled corticosteroids have in the airways of sufferers of asthma/COPD
(beclometasone, budesonide, fluticasone..)

A
  • reduces mucosal inflamm
  • widens airways
  • reduced mucus secretion
  • this improves symptoms and reduces exacerbations
17
Q

ICS e.g. beclometasone, budesonide, fluticasone SEs occur locally in airway, very little is absorbed into blood so there are few systemic SEs. Name 2 airway related SEs:

A

-their immunosuppressive effect can –> oral candidiasis
-can cause a hoarse voice
(so rinse mouth out and gargle after use)
-in COPD may increase risk of pneumonia (so caution use in pts with a history of pneumonia)

18
Q

Other than evidence suggesting inhaled corticosteroids -in COPD may increase risk of pneumonia (so caution use in pts with a history of pnuemonia), who else would you caution ICS use in and why?

A

-Children - may cause growth suppression

19
Q

Leukotriene receptor antagonists e.g. Monteleukast are indicated when in the following
adults:
children 5-12yrs
children <5yrs

A
  • adults: add-on for asthma when ICS, and LABAs not enough
  • children 5-12yrs: as alternative to LABAs if ICS isn’t enough to control asthma symptoms
  • children <5yrs: as 1st line preventative therapy in young children unable to take an inhaled corticosteroid
20
Q

MOA of LTRAs e.g. monteleukast

A
  • in asthma, leukotrienes produces by mast cells and eosinophils activate GPCR (CysLT1) -> cascade -> inflammation and bronchoconstriction
  • LTRAs reduce this by blocking the CysLT1 receptor so dampen down the inflamm cascade
21
Q

LTRAs are well tolerated, mild SEs include headache and abdo pain + increased risk of upper respiratory tract infections, rarely what cognitive SE is reported? And what eosinophilic autoimmune disorder has been seen in association with LTRAs?

A
  • hyperactivity and reduced ability to concentrate

- Churg-Strauss Syndrome

22
Q

Emollients are topical and used for all dry/scaly skin disorders by containing oils to soften skin, reduce water loss etc. What 2 skin conditions can they worsen and why?

A

-Acne vulgaris
-Folliculitis
(as they block pores and hair follicles)

23
Q

Latanoprost, bimatoprost are what class of medication? They are 1st line agents to lower intraocular pressure in what conditions?

A
  • Prostaglandin analogue eye drops

- open-angle glaucoma, ocular hypertension (reduces progression of damage)

24
Q

-Prostaglandin analogue eye drops reduces progression of open-angle glaucoma, ocular hypertension. These analogues of prostaglandin F2a reduce intraocular pressure how?

A

-they increase the outflow of aqueous humour via the uveoscleral pathway

25
Q

What unusual SE can prostaglandin analogue eye drops have locally due to increasing the amount of melanin in stromal melanocytes of the iris?

A

-permanent change in eye colour (affects 1/3 esp if mixed eye colour)

26
Q

Advice for all pts using eye drops is they should gently compress where for 1minute immediately after instilling the drop to reduce drainage where? In order to lower ____ absorption of the drug.

A
  • compress the medial canthus (nasal corner of eye)
  • reduces drainage through lacrimal duct
  • lowers systemic absorption of drug