IMMUNE 139 Influenza and Ageing Flashcards

1
Q

What are the 6 Geriatric Giants?

A

Confusion, not coping, incontinence, poor mobility, falls and collapse

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2
Q

What 5 domains do you need to check in a comprehensive geriatric assessment?

A

Medical, mental health, functional capacity, social circumstances and environment

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3
Q

How can pharmacological absorption change with ageing?

A

Achlorydia

Decreased hepatic blood flow = decreased first pass metabolism

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4
Q

How can pharmacological distribution change with ageing?

A

Body fat increase = increased distribution of lipophillic drugs
Decreased plasma binding = huge increase in bioavailability

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5
Q

How can pharmacological metabolism change with ageing?

A

Decrease activity of hepatic phase 1 metabolism

Decreased renal function

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6
Q

What are the two models of frailty?

A

Phenotype model and Cumulative deficit model

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7
Q

Describe the phenotype model of frailty

A

5 variables of weight loss, self reported exhaustion, low energy expenditure, slow gait speed and weak grip strength
3+ = frail
1/2 = pre-frail

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8
Q

Describe the cumulative deficit model of frailty

A

92 variable symptoms, signs or lab results giving a cumulative frequency index

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9
Q

What does a naked virus contain?

A

Nuceocapsid only - genome and the capsid

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10
Q

Describe receptor-mediated endocytosis

A

Virus attaches to membrane, membrane invaginates to form coated pit, this pinches off and is acidified to free nucelocapsid

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11
Q

How do DNA containing viruses transcribe?

A

Using hosts DNA dependant RNA polymerase

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12
Q

What sense is mRNA?

A

+ve

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13
Q

What type of viruses carry RNA polymerase?

A

SS -ve RNA and ds +/- RNA

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14
Q

Describe an acute infection?

A

rapid-onset, short lived

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15
Q

Describe a persistent infection

A

Remains in body, with or without symptoms

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16
Q

Describe a chronic infection

A

Persists with symptoms, slow to resolve

17
Q

Describe a latent infection

A

Persists but can be reactivated

18
Q

Describe a subclinical (carrier) infection

A

Infected, asymptomatic but is still transmissable

19
Q

Describe an insidious infection

A

very long incubation before symptomatic

20
Q

Give an example of a virus that disseminates via nerves

A

Rabies

21
Q

What is the most common route of a disseminated infection

A

Via bloodstream

22
Q

What areas in the alimentary tract may be sites of antigen uptake and therefore entry of infection

A

M-cells

23
Q

How can viral infection indirectly cause damage to the host?

A

From hosts own immune response
Free radical production
Immunosuppression

24
Q

How can viral infection directly cause damage to the host?

A

blocking protein synthesis, cell entry/exit, cytoskeletal breakdown, cell death

25
Q

When is NO produced?

A

During acute inflammation

26
Q

How does aciclovir work?

A

By replacing guanosine on DNA and therefore blocking replication

27
Q

What is aciclovir active against?

A

HSV and VZV

28
Q

What does aciclovir require to become active and what advantage does this confer?

A

Requires phosphate addition and needs a viral enzyme for this - targets virally infected cells only

29
Q

Why is ganciclovir less effective that aciclovir?

A

Acts on all cells as doesn’t need viral enzyme for phosphorylation