Public health Flashcards
Define public health
The science and art of preventing disease prolonging life and improving health through organised efforts of society
Define equity
Giving people what they need to achieve equal outcomes
Define equality
Giving everyone the same rights, opportunities and resources
Define horizontal equity
Equal treatments for people with equal healthcare needs
E.g. same tx used for pneumonia in different patients with the same severity of pneumonia
Define vertical equity
Unequal treatments for unequal health care needs
E.g. different treatments used in less severe vs more severe pneumonias
What is the inverse care law?
Availability of health care tends to vary inversely with its need
What are determinants of health?
Wide range of factors that influence a person’s health
Name some determinants for health
PROGRESS
Place of residence
Race
Occupation
Gender
Religion
Education
Socioeconomic
Social capital
What are the 3 domains of public health?
Health improvement
Health protection
Improving services/health care
What is meant by ‘health improvement’
Interventions aimed at promoting overall health-education, housing, employment
What is meant by ‘health protection’
Measures to control infectious disease and environment hazards-vaccination, radiation, emergency response
What is meant by ‘improving services’/health care
Organisation and delivery of safe, high quality services-clinical effectiveness, audit, etc
Name some frameworks used to assess the quality of healthcare
Maxwell’s dimensions of quality of healthcare
Structure, process, outcome
Describe Maxwell’s dimensions of quality of healthcare
3As and 3 Es
Acceptability
Accessibility
Appropriateness
Effectiveness
Efficiency
Equity
Give an example of a structure in the ‘structure, process, outcome’ framework
Number of hospitals, number of doctors etc
Give an example of a process in the ‘structure, process, outcome’ framework
Number of patients seen, number of tests done, number of surgeries done
Give an example of an outcome in the ‘structure, process, outcome’ framework
Number of deaths
What is a health needs assessment?
A systematic approach for reviewing health issues affecting a population in order to enable agreed priorities and resource allocation to improve health and reduce inequalities
What are the 3 main things taken into account in a health needs assessment?
Need: ability to benefit from an intervention
Demand: what people ask for
Supply: what is provided
Give an example of something that is supplied and demanded but not needed
Abx for a viral infection
Give an example of something that is demanded and needed but not supplied
Large waiting lists for procedures
Give an example of something that is needed and supplied but not demanded
Routine vaccinations
What are the types of needs in a health needs assessment
Felt need
Expressed need
Normative need
Comparative need
What is a ‘felt’ need? Give an example
Individual perceptions of variation form normal health-‘I feel unwell’, ‘My knee hurts’
What is an ‘expressed’ need? Give an example
Individual seeks help to overcome variation in normal health-goes to dr
E.g. going to the dentist for a toothache
What is a ‘normative’ need? Give an example
Professional defines intervention for the expressed need
E.g. Vaccinations, decision by surgeon that a patient needs an operation
What is a ‘comparative’ need? Give an example
Needs identified by comparing services received by one group vs another
E.g Rural village may identify need for a school if the neighbouring village has one
What are the 3 perspective of a health needs assessment?
Epidemiological
Comparative
Corporate
What does an epidemiological perspective of a health needs assessment look at?
1)Size of population-incidence/prevalence
2)Service available-prevention/treatment/care
3)Evidence base-(cost)effectiveness
What sources might be used when carrying out a epidemiological health needs assessment?
Disease registry
Admissions
GP databases
Name some advantages of using an epidemiological perspective to a health needs assessment
Uses existing data
Provides data on disease incidence/mortality/morbidity
Name some disadvantages of using an epidemiological perspective for a health needs assessment
Quality of data is variable
Data collected may not be data required
Does not consider felt needs/opinions of patients
Give an example of an epidemiological perspective
Looking at new incidence of measles in a certain town through GP records
What is involved in the comparative perspective of a health needs assessment?
Compares services/outcomes received by a population with others
Could compare different areas of patients of different ages etc
What does a comparative perspective of a health needs assessment look at?
Health status
Service provision
Outcomes
Name some advantages of using a comparative assessment for a health needs assessment
Quick and cheap if data available
Shows if services are better/worse than compared group
Name some disadvantages of using a comparative perspective for a health needs assessment
Can be difficult to find comparable population
Data may not be available/high quality
Give an example of a comparative perspective
Compare rated of CVD between town A and B
What is involved in a corporate perspective for a health needs assessment
Asks local populations what their health needs are
Uses focal groups, interview, public meetings
Wide variety of stakeholders
Name some advantages of using a corporate perspective for a health needs assessment
Based on felt and expressed needs of population
Recognises detailed knowledge and experience f those working with the population
Takes into account a wide range of views
Name some disadvantages of using a corporate perspective for a health needs assessment
Can be difficult to distinguish needs from demand
Groups may have vested interest
May have political agendas
Give an example of using a corporate perspective for a health needs assessment
Arrange focus group with patient from a GP surgery to discuss their views
Name some different approaches to resource allocation
Egalitarian: provide ALL care that is necessary and required for everyone(NHS)
Maximising: Act is evaluated solely in terms of its consequences(flu vaccine)
Libertarian: Each is responsible for their own health(private ehalthcare)
Name an advantage and disadvantage to an egalitarian approach to resource allocation
Good: equality
Bad: too expensive
Name an advantage and disadvantage to a maximising approach to resource allocation
Good: resources allocated to those most likely to benefit it
Bad: Those who don’t make the cut get nothing
Name an advantage and disadvantage to a libertarian approach to resource allocation
Good: promotes positive engagement
Bad: Most diseases are not self inflicted
What are the 3 kinds of prevention
Primary
Secondary
Tertiary
What is secondary prevention
Early identification of the disease to alter the disease course e.g screening, aspirin after a MI
What is primary prevention?
Preventing the disease from occurring in the first place
E.g. vaccination
What is tertiary prevention?
Limit consequences of established disease
E.g. prevent worsening renal function in CKD
What is a population approach to prevention
Delivered to everyone to shift the risk factor distribution curve
E.g. dietary salt reductions through legislation
What is a high risk approach to prevention?
ID all individuals above a chosen cut off an treat them
E.g. screening people for high BP and treating them
What is meant by the prevention paradox?
Preventative measure that brings much benefit to the population often offers little impact to each participating individual
E.g. mass immunisation
What is the purpose of screening?
ID apparently well individuals who have or at risk of developing a particular disease so you can have a real impact on the outcome
Name some disadvantages to screening
Exposure of well individuals to distressing/harmful diagnostic tests
Detection and treatment of sub-clinical disease that wouldn’t cause a problem
Preventative intervention that may cause harm to the individual or population
What screening programmes are done for pregnant women in the UK
Infectious diseases(hep B, syphilis, HIV)
Sickle cell and thalassaemia screening
Fetal anomaly screening(Down’s, Edward’s, Patau’s)
What screening programmes are in place for newborn babies?
NIPE(heart, eyes, hips, testes)
Hearing screening programme
Blood spot(sickle cell, CF, congenital hypothyroidism)
What screening programmes are done for young people and adults in the UK?
AAA screening
Bowel cancer
Breast cancer
Cervical screening
Diabetic eye screening
What criteria is used to determine if screening should be done for a disease?
Wilson and Jungner criteria
Describe the Wilson Jungner criteria
In Exam Season NAP
Important disease
Effective tx available
Simple and safe
Natural hx of disease known
Acceptable to patients
Policy on who to treat
Define sensitivity
Proportion of those with disease who are correctly identified
(If you have the disease, what are the chances the test will pick it up?)
Define specificity
Proportion of people without disease who are currently excluded by screening test
(If you don’t have the disease, what are the chances the test will tell you you don’t)
Define positive predictive value
Proportion of people with a positive test result who actually have the disease
(SNIP-Sensitivity is positive)
Define negative predictive value
Proportion of people with a negative test result who do not have the disease
SPIN)Sensitivity is negative)
What are predictive values influenced by?
Underlying prevalence
How do you calculate sensitivity?
people with the disease+positive screening/everyone who has the disease
How do you calculate specificity?
People with negative result who don’t have disease/everyone who doesn’t have the disease
How do you calculate the positive predictive value?
people with positive result who have the disease/everyone with a positive result
How do you calculate the negative predictive value
Those with negative result who don’t have disease/everyone who receives a negative result
Name 2 biases associated with screening
Length time bias
Lead time bias
What is length time bias?
Screening is more likely to detect slow-growing disease that has a long phase without symptoms-> appear to be survival benefit to screening even when early detection doesn’t improve outcomes
What is lead time bias?
Patients diagnosed appear to live longer because they know the have the disease for longer-> awareness of disease makes it falsely seem like early diagnosed patients live longer
Describe the hierarchy oof evidence
Editorials and expert opinions
Case series and case reports
Case-control studies and cross sectional studies
Cohort studies
RCT
Systematic review and met-analysis
Describe the features of a case-control study
Retrospective, observational study looking at the cause of disease
Compares similar participant with disease to controls without
‘Case’ and ‘control’: look for exposure in both cases and control group and see what the effects are
Name some advantages of a case-control study
Good for rare outcomes
Quicker than cohort or intervention studies(outcome already happened)
Can investigate multiple exposures
Name some disadvantages of a case-control study
Difficulties finding controls to match with case
Prone to selection and information bias
Describe the features of a cross-sectional study
Retrospective observational collects data from a population at a specific point in time ‘snapshot’
Prevalence of risk factors and disease itself
Name some advantages of a cross-sectional study
Relatively quick and cheap
Provide data on prevalence at single point in time
Good for surveillance and PH planning