Miscellaneous Flashcards

(55 cards)

1
Q

What is AIDS?

A

Chronic potentially life threatening condition caused by HIV virus

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2
Q

How common is AIDS?

A

Mostly affects 15-24 year olds
1 in 4 people with HIV worldwide don’t know they are infected
1 million people die each year due to undiagnosed HIV
97% of people with HIV in UK are on ART
Number of new infections falling
100,000 people living with HIV at end of 2018
7,500 people were living with undiagnosed HIV infection
Epidemic is diverse
High prevalence in Central London, Rotherham, Sheffield, Manchester

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3
Q

How can you prevent HIV/AIDS?

A
Circumcision
PEP - post-exposure prophylaxis
PreP- pre-exposure prophylaxis
Behavioural changes - condom usage
STI control
Vaccines
Microbicides
Diagnosis/partner notification
HAART
Screen blood products/needle exchange
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4
Q

What can increase your risk of getting HIV?

A
Men who have sex with men
Heterosexual women
Injecting drug users
Commercial sex workers
Truck drivers
Migrant workers
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5
Q

What is acute HIV syndrome?

A

Within 2-4 weeks of infection but can be up to 10 months
Abrupt onset of non-specific symptoms
Severe symptoms

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6
Q

What is clinical latency in HIV?

A

No symptoms

May notice enlarged lymph nodes - persistent generalised lymphadenopathy

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7
Q

How does HIV infect cells?

A

Virus enters via mucosa
APCs to T cells a lymph nodes
Local infection within a mucosal macrophage or dendritic cell established and then spreads to other cells
Initially humoral and cell mediated responses
Level of HIV free in plasma very high around 3 weeks
Falls after this as immune response begins to fight it
T cells recover after primary infection
Eventually develop a viral reservoir that you cannot get rid of
CD4 cells begin to fall
AIDS when CD4 < 200

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8
Q

How does the virus replicate within CD4 cells?

A
Attachment entry
Transcription
Assembly of new virions
Budding
HIV receptors
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9
Q

What infections can you get when CD4 cells begin to get to moderately low levels?

A
Shingles
Candida
Oral hairy leucoplakia
Molluscum contagiosum
Kerion
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10
Q

What infections can you get with AIDS?

A

Pneumocystitis pneumonia
Infections, neoplasms, direct HIV effect, immunological
AIDS defining conditions

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11
Q

How does HIV present?

A

Generalised lymphadenopathy
Acute generalised rash
Glandular fever/flu-like illness
Prolonged episodes of HSV
Persistent frequently occurring candidiasis
Oral candida
Indicators of immune dysfunction
Recently developed or worsening skin conditions
Odd looking mouth lesions
Unexplained weight loss or night sweats
Persistent diarrhoea
Gradually increasing shortness of breath and dry cough
Recurrent bacterial infections - pneumococcal pneumonia
Recurrent/unexplained infections

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12
Q

How does acute HIV syndrome present?

A
Fever, sweats
Sore throat
Myalgia
Rash
Vomiting/diarrhoea
Headache
Lymphadenopathy
Hepatosplenomagaly
Mouth ulcers
Myalgia/arthralgia
Significant weight loss
Lethargy and depression
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13
Q

How is HIV/AIDS diagnosed?

A
Venous blood sample - most accurate
Salivary antibody screening 
Prick test
Monitored via CD4 cell count 
HIV viral load
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14
Q

How is HIV/AIDS treated?

A

HAART
3+ antiretroviral drugs
Act on different points in HIV replication cycle to suppress virus
Significant impact on mortality and morbidity
Prevents HIV developing resistance to drugs

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15
Q

How common is breast cancer?

A

By far most common cancer in women
2nd most common cause of death in UK
Majority arise from either - epithelial lining of ducts (ductal) or from epithelium of terminal ducts of lobules (lobular)
Affects 1 in 9 women
Rare in men - 1%
Risk increases with age - less than 5% below 35
Most common histological subtype infiltrating ductal carcinoma 70%
Lobular carcinoma 10-15%
Medullary cancers 5% tend to affect younger patients
Colloid/mucoid cancers tend to affect the elderly

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16
Q

What does the UK breast cancer screening programme involve?

A

Biplanar digital mammography every 3 years in women aged 50-70 years and improvements in multi-modality treatment have increased overall survival and rates of cure

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17
Q

What is familial breast cancer?

A

5-10% breast cancers due to BRCA1 mutation (long arm chromosome 17) or BRCA2 (long arm chromosome 13)
BRCA1 higher risk
Tumour suppressor genes that act as inhibitors of cellular growth
BRAC1 65% risk
BRCA2 45%
Sronger incidence of BRCA1 than BRCA2

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18
Q

What can increase your risk of getting breast cancer?

A
Increasing age
FHx in 1st degree relative
BRCA1 or 2 mutation
Never having borne a child/first child after 30
Not having breast fed
Early menarche and late menopause
Radiation to chest
HRT with oestrogen and progesterone
Combined OCP
Obesity
Past breast cancer
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19
Q

What are the possible symptoms of breast cancer?

A

Most women with symptomatic present with painless, increasing mass that may also be associated with

  • Skin tethering
  • Ulceration
  • Nipple discharge
  • In inflammatory cancer - oedema and erythema
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20
Q

What is a possible differential diagnosis of breast cancer?

A

Benign breast disease

  • Fibroadenoma
  • Breast cysts
  • Intraductal papilloma
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21
Q

How is breast cancer diagnosed?

A

Clinical examination
Radiology - USS for < 35, mammography and USS > 35
Histology and cytology
- Fine needle aspiration - if cystic lump - clear fluid (discard and reassure), bloody fluid found (cytology)
USS guided biopsy
- If there is residual mass/solid lump - if malignant plan treatment
Ask direct questions eg past lumps, FHx, pain, changes in size related to menstrual cycle, skin changes, nipple discharge
Consider metastatic disease - weight loss, breathlessness, back pain, abdominal mass
Check oestrogen receptor, progesterone receptor and human epidermal growth factor 2 status as will affect treatment options
Expression of HER2 adverse factor for small, otherwise good prognosis tumours - tumour more likely to grow and divide

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22
Q

How is breast cancer staged?

A

CXR, MRI, CT, liver, USS, bone scan, LFTs, Ca2+
Stage 1 - confined to breast, mobile
Stage 2 - growth confined to breast, mobile, lymph nodes in ipsilateral axilla
Stage 3 - tumour fixed to muscle but not chest wall, ipsilateral lymph nodes matted and may be fixed, skin involvement larger than tumour
Stage 4 - complete fixation of tumour to chest wall, distant metastases
TMN
- T1 < 2cm
- T2 2-5cm
- T3 > 5cm
- T4 fixed to chest wall
- N1 mobile, ipsilateral nodes
- N2 fixed nodes
- M1 distant metastases

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23
Q

How is stage 1-2 breast cancer treated?

A

Surgery - removal of tumour by wide local exision or mastectomy, +/- breast reconstruction, axillary node sampling/surgical clearance
Radiotherapy - for those with invasive cancer, S/E pneumonitis, pericarditis, rib fracture
Chemotherapy - alongside surgery
Endocrine therapy - aim to reduce oestrogen activity used in ER and PR positive disease, only used post-menopausal
- Oestrogen receptor blocker eg oral tamsulosin
- Aromatase inhibitors that target peripheral oestrogen synthesis eg oral anastrozole
If premenopausal and ER positive ovarian ablation via surgery/radiotherapy to stop oestrogen synthesis, GnRH analogues

24
Q

How is stage 3-4 breast cancer treated?

A

Radiotherapy to bony lesions - bisphosphonates
Oral tamoxifen used in ER positive - if relapse after initial success then consider chemotherapy
Oral trastuzumab for HER2 positive tumours
CNS surgery for solitary and easily accessible metastases if not radiotherapy

25
How can you prevent breast cancer?
Promote awareness | Screening - 2 view mammography every 3 years for women aged 47-73 years
26
What is amyloidosis?
Group of disorders of protein metabolism where there is extracellular deposition of insoluble fibrillar protein called amyloid which is resistant to degradation Localised amyloidosis deposition occurs in brain of patients with Alzheimer's Local amyloid deposition also feature of T2DM and long-term haemodialysis
27
How common is amyloidosis?
Rare disease Systemic amyloidosis is fatal and responsible for 1 in 1500 deaths per year in UK Can be acquired or inherited May be localised or systemic
28
How is amyloidosis classified?
By nature of precursor plasma proteins that form the fibrillar deposits AL amyloid - primary AA amylodosis - secondary ATTR familial
29
What is primary amyloidosis?
AL amyloidosis Abnormal plasma cells in bone marrow produce light chain amyloid protein Light chains normally part of healthy immunoglobulins and thus proteins referred to as amyloidogenic monoclonal immunoglobulin fibrillar light chain proteins Protein get deposited and result in organ failure and death Associated with myeloma and non-Hodgkin's lymphoma
30
How does AL amyloidosis present and how is it treated?
Affects normal structures and function of affected tissue Kidneys - glomerular lesions resulting in proteinuria and nephrotic syndrome Heart - restrictive cardiomyopathy, arrhythmias and angina Nerves - peripheral and autonomic nephropathy and carpal tunnel syndrome GI - macroglossia, malabsorption, weight loss, perforation, haemorrhage, obstruction, hepatomegaly Vascular - purpura especially periorbital Treatment - optimise nutrition, alkylating agent and corticosteroid eg oral melphalan and prednisolone
31
What is secondary amyloidosis?
AA amyloidosis Derived from serum amyloid A, an acute phase protein, related to chronic inflammatory disorders and chronic infection - RA, UC/Crohn's, familial Mediterranean fever, chronic infections eg TB, bronchiectasis, osteomyelitis
32
How does AA amyloidosis present and how is it treated?
Affects kidneys, liver and spleen Proteinuria, nephrotic syndrome, hepatosplenomegaly, macroglossia NOT SEEN, cardiac involvement rare Treat underlying cause
33
What is ATTR familial amyloidosis?
Autosomal dominant condition | Usually caused by mutations in transthyretin where mutant protein forms amyloid fibils
34
How does ATTR familial amyloidosis present and how is it treated?
Sensory and autonomic neuropathy Cardiomyopathy Renal involvement Treatment - liver transplant can cure
35
How is amyloidosis diagnosed?
Biopsy of affected tissue - Rectum or subcutaneous fat relatively non-invasive sites for biopsy and positive 80% - Biopsy positive if there is congo red staining with red-green birefringence under polarised light microscopy
36
What is the prognosis of amylosis?
Median survival 1-2 years | Patients with myeloma and amyloidosis have shorter survival then those with myeloma alone
37
What is lymphoedema?
Chronic, non-pitting oedema caused by lymphatic insufficiency ie failure of lymphatic drainage Most commonly affects legs and tends to progress with age Legs can become enormous and prevent normal shoes being worn Chronic disease may cause secondary cobblestone thickening of skin
38
How is lymphoedema classified?
Primary lymphoedema - Presents in early life - Due to inherited deficiency of lymphatic vessels Severe lymphoedema - Due to obstruction of lymphatic vessels - filiarial infection, malignant disease, trauma, radiotherapy, surgery
39
How is lymphoedema treated?
Compression stockings Physical massage For filariasis infection give oral diethylcarbamazine - Kills worms and microfilaeiae - Serious allergic responses may occur as parasites are killed - S/E facial swelling, headaches, lethargy If recurrent cellulitis, long-term antibiotics advisable as each episode of cellulitis will further damage lymph vessels eg prophylaxis low-dose antibiotics twice daily Surgery should be avoided
40
What are sarcomas?
Group of rare solid tumours of connective tissues - more than 50 different histological subtypes known Cancers develop in muscle, bone, nerves, cartilage, tendons, blood vessels and fatty and fibrous tissues Mesodernal origin tumours
41
What is the epidemiology of sarcoma?
1% of all adult tumours | Soft tissue sarcoma more common than bone sarcoma (80%)
42
When is soft tissue sarcoma more common?
Can affect any body part More common in middle aged and elderly Eg leiomyosarcoma STS red flag - lump that is big/getting bigger, deep in body tissues, painful and occurs when older
43
How does STS present?
Lump that is painless at first Pain and soreness as lump grows and presses against nerves and muscles Leiomyosarcoma in womb may cause bleeding other than when patient having period/menopause Most metastasis to lung initially
44
How are STS diagnosed
MRI and core needle biopsy | CT thorax for lung metastases
45
How are STS treated?
Surgical resection and chemotherapy +/- radiotherapy | Chemotherapy +/- radiotherapy is unresectable
46
How common are bone sarcomas?
Only affect less than 500 people in UK per year More common under 20 Osteosarcoma Red flags - non-mechanical bone pain, night pain, palpable bony mass, average duration of symptoms 3m, bone destruction, new bone formation, periosteal swelling, soft tissue swelling suggests new tumour
47
How does bone sarcoma present?
``` Non-mechanical bone pain still present when lying still Swelling Feeling tired Pyrexia Weight loss ```
48
How is sarcoma diagnosed?
X-ray CT/MRI Bone scans and biopsy
49
How is sarcoma treated?
Wide surgical resection and reconstruction | Chemotherapy +/- radiotherapy
50
What chemotherapy regimen may you use in breast cancer stages 1-2?
Epirubicin + CMF (cyclophosphamide, methotrexate, fluorouracil)
51
Name an oestrogen receptor blocker?
Tamoxifen
52
What are the side effects of tamoxifen?
``` Hot flushes Weight gain Mood changes Vaginal discharge Thromboembolism ```
53
Name an aromatase inhibitor
Anatrozole
54
How do aromatase inhibitors work?
Target peripheral oestrogen synthesis
55
What are the side effects of aromatase inhibitors?
``` Hot flushes Vaginal dryness Arthralgia Skin rash Osteoporosis ```