Modern Medicine, c.1900-Present Flashcards
What new focus began after knowledge of disease increased?
The search for ways to prevent people getting diseases and to cure those who already had them.
What were magic bullets?
Chemical cures for diseases for example:
1) Ehrlich discovered Salvarsan to cure Syphilis in 1909
2) Prontosil worked against germs that caused blood poisoning.
3) Sulpha drugs were developed to cure or control meningitis, pneumonia and scarlet fever.
What happened with Staphylococcus by the 1920s?
It was highly resistant and remained undefeated by any magic bullet. Staphylococcus could cause food and blood poisoning.
Why was Fleming determined to find a better way of treating wounds?
He had seen first hand during WWI the effects of the Staphylococcus germ.
How did Alexander Fleming discover penicillin?
In 1928 he went on holiday and left several plates of Staphylococcus germs on a bench in his lab, when he returned he noticed a large blob of mould in one of the dishes.
It turned out that this mould killed the Staphylococcus and that it was penicillin mould.
What did Fleming original decide penicillin was?
A natural antispetic because he never used pencillin on infected nimals and therefore did not show that it could kill infections, there was littel interest in his work at the time.
What it Howard Florey and Ernst Chain do for Penicillin?
In the 1930s they tested pencillin on 8 mice and the humans over a period of months. They produced enough penicillin to treat a patient with a bad infection, once the patient was injected with penicillin, the infection began to clear up.
However, the patient died when the pencillin ran out. They were showing it could treat infection, but now needed to mass produce it.
How did Florey and Chain mass produce penicillin?
In June 1941, Florey met with the US government who agreed to pay several huge chemical companies to make millions of gallons of penicillin as it was vital in treating soldiers with infected wounds.
As soon as the war ended drug companies made penicillin available for public use.
How many soldiers were treated with penicillin by the end of WW2 in 1945?
250,000
How did the pharmaceutical industry develop and why?
After penicillin’s discovery government sponsored programmes to develop and produce it meant that the industry had both finance and technology to research and develop medicines for all sorts of diseases.
What is the estimated woth of the pharmaceutical industry today?
£200-300 billion and employing nearly 80,000 people in the UK alone as of 2018.
What was the impact of pencillin?
1) 15% of wounded British and US soldiers would have died WITHOUT pencillin.
2) Thousands of injured soldiers returned to service quicker
3) After WW2, Penicillin was classified as an anti-biotic and went on to save millions of lives.
4) Other antibiotics followed: streptomycin (1944) which treated TB, tertracycline (1953) treated skin infections and mitomycin (1956) has been used as a chemotherapy drug.
Key developments in the science of the body and disease after 1945:
1953 - Stem cells discovered and in 2013 the first human liver was grown from stem cells
1953 - Crick and Watson map out the DNA structure; understanding DNA leads to developments such as gene therapy, genetic screening and genetic engineering.
1970s and 1980s - CAT scanners that produced 3D images of the body developed in 1973. Endoscope probes that allowed doctors to see inside the body in 1975 and in 1987 the MRI Scan developed.
Key developments in surgery after 1945:
1950 - first open heart surgery to repair a ‘hole’ in a baby’s heart; first pacemaker is fitted in 1958, followed by the first heart transplant in Britain in 1968
We can now transplant livers, kidneys, pancreases and bone marrow.
1952 - minature hearing aids.
1972 - hip replacements
1984 - skin grafts become common, working off the original work of Harold Gillies in World War 1
Key developments in the treatment of disease after 1945:
1946-1968: Free vaccines available in the UK for: TB, diphtheria, whooping cough, tetanus, polio, measles and rubella (German measles).
1957 - the drug thalidomide is developed in Germany and used to treat morning sickness, but it causes terrible deformities in babies creating the thalidomide crisis.
1970 - a British scientist develops the drug cyclosporine which prevents the body from rejecting transplanted organs.
1978 - doctors use IVF fertility treatment to help childless women become pregnant.
How did war aid in medical developments in the 20th century?
- Two world wars meant that governments spent a fortune on research and resting drugs and surgical techniques
- Doctors had to find better ways to treat casualities too
- Doctors had an abundance of casualities to practice on and develop new techniques on.
How did technology aid in medical developments in the 20th century?
- New tech like keyhole surgery and MRI scanning helped doctors and surgeons to develop new techniques for identifying illnesses and operating on them.
- Discoveries, such as understanding more about DNA helped gene researchers find specific genes involved in diseases.
How did changing attitudes aid in medical developments in the 20th century?
Modern politicians have realised that one of their main priorities is to help and protect the people they serve. Moving away from a laissez-faire attitude i.e. healthy eating standards in schools and couch to 5k programmes.
How did Government and Finance aid in medical developments in the 20th century?
- Governments spend far more money on research and care than ever before.
- Drug companies spend huge amounts on research and development, hoping to make money from cures.
How did Communication aid in medical developments in the 20th century?
- New ideas spread rapidly due to the increased use of television, news media and the internet
- Television and radio advertisements have made more people than ever before aware of health risks
How did Individuals aid in medical developments in the 20th century?
- Crick and Watson
- Alexander Fleming
- Florey and Chain