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CTP > Population science > Flashcards

Population science Flashcards

1
Q

define a clinical trial

A

any form of planned experiment which involves patients and is designed to find most appropriate treatment for future patients with a given medical condition

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2
Q

pruprose of a clinical trail

A

provide evidence of a treatment efficacy and safety

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3
Q

what is efficacy

A

measuring the effect of the treatment under perfect conditions

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4
Q

what is ‘safety’ in terms of the purpose of a clinical trial

A

not to harm the group a=under specific conditions

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5
Q

layout of a clinical trial

A

new treatment measured against the standard treatment which could be a placebo, or the standard treatment or nothing

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6
Q

what factors need to be considered to make the trial fair

A

needs to be:
reproducible
controlled (comparisons)
fair (unbiased without confounding)

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7
Q

what is the difference between effectiveness and efficacy

A

efficacy is the ideal clinical conditions

effectiveness is real world clinical experience. without the perfect clinical conditions

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8
Q

what are the different phases of clinical trials

A

phase 1- volunteer studies (pharmacodynamics and kinetics + side effects)
phase 2- treatment studies (effects, dosages and common side effects)
phase 3 - clinical trials (comparison with other treatments)
phase 4- post marketing surveilllence (monitoring with standard treatments)

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9
Q

what is a non-randomised trial

A

allocation of patients receiving a new treatment to compare with group receiving standard treatment.

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10
Q

problems with non-randomised clinical trials

A
  • allocation bias

- confounding

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11
Q

what is comparison with historical controls

A

comparison of group of patients who had standard treatment with those receiving new treatment

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12
Q

problems with comparison with historical controls

A

selection is less well defined, may have been treated differently from new treatment group , less info about bias and confounders, can’t control for all confounders

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13
Q

explain the conduct of a randomised clinical trial (RCT)

A
  1. identify the eligible patients
  2. invite patients to trial
  3. consent patients
  4. allocate the treatments fairly
  5. follow up identically
  6. minimise losses to follow up
  7. maximise adherence to treatments
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14
Q

definitions of the key study variables

A
  1. the disease of interest
  2. the treatments to be compared
  3. the outcomes measured
  4. the possible bias and confounders
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15
Q

how to compare outcomes of an RCT

A

use the 95% confidence interval.
the observed rate ratio is used to work out the 95% confidence interval.
If p value (1) is within the confidence interval then null hypothesis is correct, if not then it is incorrect.

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16
Q

why we need pre-defining outcomes for an RCT

A

need to define how outcomes are measured before the trial to prevent data dredging (using it to uncover patterns), it is also protocol for data collection.

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17
Q

what is a primary outcome

A

the thing you want to find out from the trial. is used in the sample size calculation

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18
Q

what is secondary outcome

A

another outcome of interest

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19
Q

different types of outcomes (x3)

A

Pashto-physiological e.g tumour size
clinically defined e.g death
patient focused e.g quality of life

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20
Q

features of an ideal outcome

A

appropriate and relevent - to the patient
valid and attributable - can be linked to treatments being compared
sensitive and specific - detects changes accurately
reliable and robust - still measurable in variable settings = similar result
simple and sustainable - method can be carried out and repeated
cheap and timely - not execssively expensive measure and doesn’t have lag time

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21
Q

what is non-random allocation

A

when you allocate them to groups that aren’t random but are intended to produce similar groups. potential for selection bias and confounding factors

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22
Q

what is random allocation and its advantages and disadvantages

A

allocate participants to the treatments fairly.
minimal allocation fairly
minimal confoudning
BUT randomising numbers in small groups can result in unequal groups

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23
Q

what is minimal allocation

A

randomisation gives each patients equal chance of being selected

24
Q

minimal confounding

A

in long run leads to groups that are similar in size and characteristics by chance

25
Q

what is a confounder

A

factor associated with the exposure and is indenpnedtly a risk factor for the dsiease

26
Q

the problem with knowing which treatment you’ve been allocated

A

patient may alter their behaviour (behaviour effect)
clinician may alter treatment or care or interest (non-treatment effect)
investigator may alter approach when making measurements (measurements bias)

27
Q

how to avoid selection bias

A

randomisation

28
Q

how to avoid recall/reporting bias

A

black and white tools e.g dead or alive or blinding

29
Q

how to avid observer bias

A

blinding the observer

30
Q

3 types of blinding

A

single blind - patient doesn’t know
double blind - patient, and investigator don’t know
triple blind - no one knows

31
Q

examples of when blinding is difficult

A

surgical procedure
lifestyle interventions
prevention programes
psychotherapy vs antidepressant

32
Q

what is comparing with no treatment

A

new treatment group compared to group receiving no treatment. see if it was actually the treatment or just the fact they were receiving ‘care’

33
Q

what is the placebo effect

A

attitude of patient towards illness may be improved by a feeling that something is being done about it

34
Q

what is a placebo

A

inert substance made to appear identical to the one it is being compared with e.g formula, tenxture, smell eat

35
Q

what is the ethical implication of a placebo

A

use of placebo is a form of deception therefore participants must be informed they may be receiving one. also not allowed to use it unless there is no standard treatment to compare it to

36
Q

what is losses to follow up

A

not all participants stay in trial - condition may mean worsen and they need to withdraw or they chose to withdraw

37
Q

how to minimise loses to follow up

A

make follow up practical and minimise inconvenience
be honest about the commitment needed
maintain contact with patients

38
Q

causes of non-compliance

A

misunderstood instructions, don’t like taking treatment, Think the treatment isn’t working, prefer to take another treatment, can’t be bothered

39
Q

How to maximise compliance

A

Make instructions easy, ask about compliance, ask about effects and side effects and monitor compliance for example with a tablet count

40
Q

How to consider issues

A

Not possible to have 100% follow-up therefore analysis outcome should take these issues into account

41
Q

What are the two different interpretations of whether the new treatment is better than the standard treatment

A
  1. The psychological action of the new treatment e.g. does the drug A lower blood pressure more than the other drug B
  2. Is the new treatment better than the standard treatment in a routine clinical practice e.g. if you prescribed drug A is it better at lowering blood pressure than drug B
42
Q

What is an explanatory trial?

A

It analyses only those who complete follow up and comply with treatment.
BUT this loses affect of randomisation because non-compliance are likely to be systematically different from compilers. This is selection bias and confounding

43
Q

What is a pragmatic trial

A

Analyses everyone according to their original allocation.
Preserved randomisation, minimal selection bias and confounding
Compares the likely effects of using treatments in routine clinical practice

44
Q

As treated versus intention-to-treat

A

As treated give a larger sizes of affect whereas intention-to-treat analyses tend to give smaller and more realistic sizes of the effect. usually you would use intention to treat

45
Q

What is the declaration of Helsinki

A

But the health of patients will be the first consideration and only acting in the patient’s interest

46
Q

What is collective ethic

A

All patients should have treatments that are properly tested for efficacy and safety

47
Q

What is individual ethic

A

The principles of the four pillars of ethics benefice nonmaleficence autonomy and justice

48
Q

Issues to consider for a clinical trial to be ethical

A 
Clinical equipoise 
robust scientifically
Ethical recruitment 
valid consent 
Volunteriness
49
Q

What is clinical Equipose

A

uncertainty or genuine ignorance about the better treatment or intervention - why you need to test it
But what constitutes reasonable uncertainty and how is better defined for the patient and is uncertainty or ignorance by the clinician or the community as a whole?

50
Q

What does scientifically robust mean

A

It’s addressing an important issue (which can be justified) and asked a valid question, has the potential to reach some conclusions and is it appropriate study design (taking safety into consideration) and protocol

51
Q

What is ethical recruitment and what are the issues of it

A

Issues include participants with the inappropriate inclusion from communities that won’t benefi, participants that have a high risk and participants that are likely to be excluded from the analysis (small subgroup of Chinese), People who can’t you can’t get valid consent from people who differ from the ideal homogenous group.

52
Q

What does valid consent involve

A

Knowledgeable informant, that the patients are given appropriate information, that the patient is competent to make a decision and someone to legitimately authorise the consent
Signed consent does not equate to valid consent!

53
Q

What does voluntariness involve

A

The decision should be free from coercion or manipulation

Volunteering this is part of the consent to being valid

54
Q

What is coercion

A

When the patient doesn’t access the best treatment or has a lower quality of care which is why they take part in the trial

55
Q

What is the role of the research ethics committee

A

To reserve the dignity rights safety and well-being of participants

56
Q

What is the role of the NHS trust in the research ethics committee

A

They are involved with the financial management, resource implications and research governance

57
Q

What does the research ethics committee focus on

A

The recruitment of participants, care and protection protection of research participants’ confidentiality, informed consentand community considerations

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