Things to Learn Flashcards
what is the most common cancer in men
prostate
What do LHRH analogues do
LHRH analogues (also called GnRH analogues) act by desensitizing LHRH receptors in the pituitary gland, which in turn prevents the secretion of luteinizing hormone (LH), causing the body’s androgen levels to drop in the long term
How is prostate cancer linked to normal influences
Hormonal influences – prostatic adenocarcinoma is androgen sensitive because castration with surgery or LHRH analogues is associated with disease regression.
- binding of androgens induces the expression of growth factors and growth factor receptors which stimulate the progressive growth of the cancer
what other conditions cause a raised PSA
Benign prostatic hypertrophy (BPH), prostatitis, urinary tract infections (UTI), trauma etc.
what is the gold standard for diagnosis Prostate cancer
Trans Rectal Ultrasound Guided Biopsy
How does the Gleason score work
Therefore a combined Gleason Grade score is used which is the sum of:
- The most common grade
- The highest/dominant grade
what can CT be used to assess in cancer
- stage of the disease and how much it has spread
what are the symptoms of a testicular torsion
Swollen, tender and erythematous testicle
Black internally
Black externally
Necrosis which also extends into the spermaticord
what is an orchiopexy
– surgical attachment of testes to scrotum to fix them into position
what do Sertoli cells do
– support cells involved in regulating spermatogenesis, spermiogenesis, blood-testes barrier, hormone production, tubular fluid secretion and phagocytosis of spermatid cytoplasm.
what do leydig cells do
– are located in the intersitium and synthesise testosterone
what are the risk factors for a seminoma
Undescended testes - poor histological development due to exposure to high temperature.
Infant hernia (indirect inguinal)
Rare genetic conditions
describe seminoma
Macroscopic Hard Well circumscribed Pale/ White mass Lobular Homogenous
Microscopic
- Nuclear pleomorphism
- Prominent nucleoli
- Clear cytoplasm
- Well defined cell boundaries
what serum marker are used for what tumours in men
Seminoma – PLAP (Placental Alkaline Phosphatase)
Choriocarcinoma – hCG (human chorionic gonadotrophin)
Yolk sac tumours – AFP (alpha-fetoprotein)
Embryonal carcinoma - Oct4
What does cervical screening involve
Cervical screening involves taking a sample of epithelial cells from the transformation zone using a brush or a spatula, applying/smearing this to a slide and then staining with a Papanicolaou stain (Pap)
what are the types of cervical cancer
80% squamous cell carcinoma
15% adenocarcinoma
describe characteristics of kilobytes
Nuclear enlargement
Nuclear hyperchromasia (darker nuclei)
Peri-nuclear halo
what does a women above 35 breast look like
Older women (>35 years) – undergo changes to breast tissue as fibrous tissue in the breast gets replaced by adipose tissue which is more radiolucent (passes more X-rays) through it, hence a mammogram increases the sensitivity for the detection of a lump.
what two techniques are used to find an adenoma
ultrasound
mammogram
can also use a fine needle aspiration for cytology
describe a fibroadenoma
Commonest benign breast tumour
<30 years
Arises in the breast lobule
Firm, smooth, mobile lump - ‘breast mouse’
Painless
Benign overgrowth of collagenous tissue within the lobule
Can have multiple in one breast
What are the symptoms of ovarian cancer
- bloating
- feeling full quickly while eating
- pelvic or abdominal pain
- urinary urgency
- abdominal vaginal bleeding or discharge
- back pain
Name the three types of epithelial tumours
Serous
Mucinous
Endometroid
what are the three sex cord stomal cells
Granulosa cell tumour
Thecoma fibroma
Sertoli-Leydig cell tumour
what is the surgery of ovarian cancer
Total Abdominal Hysterectomy and Bilateral Salpingo-oopherectomy
what HPV is associated with genital warts
6 and 11
what HPV is associated with carcinoma
HPV 16, 18, 31, 33,
How does HPV cause cancer
- Papillomavirus DNA is incorporated into the host genome
- this produces the proteins E6 and E7 which form complexes with anti-oncogenes such as p53 and retinoblastoma thereby inactivating the normal cellular response to DNA damage
- this results in accumulation of genetic abnormalities
when does an ovarian adenocarcinoma originate from
Fallopian tube
what are the type of cervical cancers
80% of being squamous cell carcinoma
15% adenocarcinoma
- the remainder are Aden-squamous and neuroendocrine carcinomas and these are caused by high oncogenic risk GPV
what is the transformation zone in the cervix and vaigna
- changes occur with the eversion (turning inside out) of then endocervical columnar epithelium onto the ectocervix
- the protrusion of the endocervical epithelium forms what is referred to as the endocervical columnar ectropion
- thus at punters the original squamous-columnar junction becomes relocated outside the external os
- in response to the acidic conditions of the vaginal vault areas of ectropion are replaced with stratified squamous epithelium by metaplasia involving stages of reverse cell hyperplasia and immature metaplastic epithelium
- this is transformation zone
what type of HPV causes what type of carcinomas in the cervix
Squamous cell carcinomas HPV16
adenocarcinomas HPV18
How does HPV infect
HPV infect immature basal cells through epithelial breaks caused by damage
- this can directly infect metaplastic squamous epithelium but it cannot infect mature superficial squamous epithelial cells
what are dyskaryotic changes of the nucleus
- disproportionate nuclear enlargement
- irregularity in form and contour
- hyperchromasia
- irregular chromatin condensation
- abnormalities in number, for, and size of nucleoli
- multinucleate
- nucleus to cytopaslm ratio increases as dyskaryosib prowesses so exfoliated cells with severe dysplasia most resemble immature basal cells
what two HPVs are associated with common warts
HPV 2 and 7
what are the two types of connective tissue that the breast stroma is made up of
1, interlobular stroma = this is comprised of a dense fibrocollagenous tissue mixed with adipose tissue
2, intra lobular stroma - this is comprised of a looser fibrocollagneous tissue contains hormonally responsive breast-specific fibroblasts important in mammary gland remodelling for example in pregnancy
What happens to the breast tissue with ageing
- with ageing from approximately age 30 and through menopause the breast lobules involute and can nearly complete atrophy in the elderly
- adipose is more prominent
- lobules decrease in size and in number
describe what epithelial tumours are like and where they project
- cystic with solid components
- smooth surface or be covered in papillary projections
- spread is often into the peritoneal cavity
What are the type of ovarian carcinomas
- serous adenocarcinoma
- mucus adenocarcinoma
what plays a role in pathogenesis of prostate cancer
- androgens
- IGF-1 plays a role
- diet as well plays a factor
what is the only certain risk factor for development of germ cell tumours
cryptorchidism
- risk factor in germ cell tumours of the testsis mainly seminomas
- accounts for approximately 10% of cases
development of the testis does not…
occur normally at higher temperatures
- histological changes occur within the undescended testsis as early as 2 years of age and are evident as tubular atrophy with an arrest in germ cell development
- in the adult, tubules are lined by a preponderance of Sertoli cells instead of having normal cellular development
what is a choriocarcinoma made out of
- made out of giant syncytiotrophoblast cells and cytotrophoblasts
- this is why it secretes HCG
what can HCG give rise to
gynaecomastia
what risk is a biopsy of a testicular neoplasm associated with
a risk of tumour spillage and potential spread
- therefore standard management of a solid mass in the testis is a radical orchiectomy based on the presumption of malignancy
What leads to hyaline membrane disease
Architectural & functional immaturity of lungs ◦ preterm babies
◦ babies from diabetic mothers
◦ male gender, caesarean section
Deficiency of pulmonary surfactant
what causes an increase and decrease in pulmonary surfactant
glucocorticoids, thyroxine & labour increase
insulin & Caesarean section decrease
certain genetic polymorphisms SP-A, SP-B
what are the complications of hyaline membrane disease
◦ chronic lung disease (BPD)
◦ pneumothorax,
- pneumomediastinum,
- pneumopericardium
What are the causes of prematurity
PROM (premature rupture of membranes) 30-40%
Intrauterine infection 25%
Uterine anomalies (fibroids, bicornuate)
Cervical incompetence
Placental problems (abruption, pl. praevia)
Multiple gestation
IOL for maternal or fetal disease
What are the major causes of death in pre-term babies(important card)
Hyaline membrane disease (HMD)
Intraventricular haemorrhage (IVH)
Necrotizing enterocolitis (NEC)
Neonatal sepsis
◦ early onset (up to 1 week of age)
◦ late onset (>1 week of age)
What factors determine survival rates in premature babies
Gestational age (>35/40)
Size
◦ BW >2500g
◦ no growth restriction
Antenatally corticosteroids
Exogenous surfactant at delivery
Postnatally
◦ management
◦ treating the underlying disease
what happens in meningococcus septicaemia
◦ shock
◦ bilateral adrenal haemorrhage
◦ widespread purpura
◦ meningitis
what investigations do you perform to get a genetic diagnosis
Antenatally
◦ chorionic villous sampling CVS
◦ amniocentesis
Postnatally or at PM
◦ blood
◦ skin
◦ sternum
what does Apgar stand for
o Appearance - colour of the baby o Pulse - heart rate o Grimace - reflex o Activity (muscle tone) o Respiration effort
what happens in perinatal asphyxia
Tissue suffers hypoxaemia, ischaemia
- hypercarbia, metabolic acidosis
What are the warnings of hypoxia ischameia
- Decreased fetal movement.
* Sentinel events (placenta abruption, uterine rupture, cord prolapse).
What does encephalopathy refer to
Abnormal neurologic function and consciousness level
Abnormalities of tone and reflexes
Autonomic dysfunction
Seizures
What are the potential targets for neuroprotection
- Decrease energy depletion - increase glucose, use hypothermia and barbiturates.
- Glutamate (inhibition of release). = via calcium channel blockers, magnesia, adenosine, hypothermia, free radical scavengers
- Inhibition of leukocyte/microglial/cytokine effects. = hypothermia, free radical synthesis inhibitors
• Blockage of downstream cellular events.
o Free radical synthesis inhibitors
o Free radical scavengers etc…
what are the 5 effects that therapeutic hypothermia has
↓ cerebral metabolism
↓ energy use
↓ accumulation of excitotoxic amino acids
↓NO synthetase activity
↓free radical activity
What are the symptoms of early onset GBS
- Apnea
- Severe hypoxia
- Cardio-respiratory failure
- Hypotension
- Metabolic acidosis
- Tachycardia
- Poor perfusion
How do you investigate early onset GBS
- Full blood count – neutropenia
- CRP – acute phase reactant – rise may be delayed by 12 hours
- Blood cultures
What are the predisposing factors to early onset GBS
• 1% of babies born vaginally to mothers who carry GBS become infected
• Predisposing Factors
– Evidence of chorioamnionitis including maternal fever
– Prolonged labour
– Prolonged rupture of membranes
– Low birthweight
what are the organisms that cause late onset sepsis in the new-born
- Coagulase-negative staphylococci
- Staph Aureus
- Others
describe the genetic and acquired reasons for a small for gestational age
Genetics • Normal small baby • Chromosomal disorders. o Edwards syndrome o Trisomy 18. • Inherited disorders.
Acquired
- Uteroplacental insufficiency - this is the most common
- congenital infection such as CMV
- smoking
- maternal chronic illness such as renal or sickle cell disease
- multiple pregnancy
How does utero-placental insufficiency happen
o Failure of syncytiotrophoblast invasion of the high resistance spiral arteries.
o Poor placental development with raised resistance in vascular bed.
Name some problems that neonates have if they are small for gestational age
- temperature control
- polycythemia
- poor nutritional status
- hypoglycaemia
- increased risk of necrotising enterocolitis
why do spontaneous preterm births happen
- Infection or ruptured membranes
- Cervical incompetence
- Polyhydramnios
what are the 3 main respiratory problems
structurally immature
- primaritve alveolar development
- susceptibility to oxygen toxicity
functionally immature
- surfactant deficient
- lack of respiratory drive - intercostal and diaphragm are weak
susceptibility to infection
Immature immune system.
Instrumentation of airway. - e.g. mechanical ventilation used can provide an easy way for pathogens to enter
what are the symptoms of respiratory distress syndrome
tachypnoea
expiratory grunting
recession
- happens within 4 hours of birth
How do you prevent respiratory distress syndrome
- Ante-natal steroids
- Avoidance of intrauterine hypoxia
- Prophylactic surfactant treatment
- Keep warm, avoid acidosis – acidosis can denatures surfactant
What happens in chronic lung disease of the infancy
Oxygen dependency in a preterm baby at 36weeks post menstrual age
Lung injury in the preterm infant
Inflammation, fibrosis, emphysema
what are the signs and symptoms for necrotising enterocolitis
- abdominal distension, tenderness, discolouration
- blood in stools
- generalised collapse
What are the risk factors for necrotising enterocolitis
- prematurity, hypoxia, infection, enteral feeding
what is the preterm central nervous system at risk of
Periventricular Haemorrhage (PVH)
Periventricular leucomalacia (PVL)
what are the risk factors for a periventricular haemorrhage
- Prematurity (very rare after 34 weeks)
- RDS
- Pneumothorax
- Hypercapnia
- Acidosis
- Hypotension
- Instability and handling
- Severe bruising at birth
overall what are the 4 main causes of death for children under 5 years
- Preterm birth complications
- Pneumonia.
- Intrapartum related events.
- Diarrhea.
How do you reduce chance of pneumonia
- Breastfeeding promotion
* Hemophilus influenzae type b and pneumococcal vaccines
What does polymorphism mean
• they are polymorphic when the frequency of the minor allele in the population is >1%.
name the three ways how you can identify disease genes
positional candidates
• Identified through genome wide genetic linkage analysis.
functional candidates
- Identified by a functional association with previously identified disease genes
exome/genome sequencing
- Identified as having rare variants in multiple unrelated affected individuals – an allelic series
- for example you remove all the common variants and this leaves the candidates genes
- you then get multiple people with the same condition and compare the cases to see which genes are shared between the individuals
- eventually you end up with on candidate gene that causes the condition
What does diphtheria act on
Acts on:
o Heart: myocarditis and heart block.
o Nerves further difficulty swallowing, paralysis, diplopia.
what does the endotoxin do
Released during lysis of the organisms.
Leads to macrophage activation
describe the pathogenesis of meningococcal disease
- Activation of inflammatory cascade via LPS
- Causes release of pro-inflammatory cytokines such as. IL-6 and TNF- alpha
- This causes myocardial depression
- Endothelial dysfunction which causes capillary leakage and shock
- Causes a coagulopathy – takes a long time for the blood to clot as the whole coagulation cascade is abnormal
= therefore this inflammatory reaction to LPS causes most the symptoms of septic shock
Name some slow bacterial infection
– Tonsillitis – Otitis media – Urinary tract infection – Gastroenteritis – Impetigo
What the three common causing meningitis and septicaemia
- streptococcus pneumonia
- neisseria meningitides
- haemophilus influenza B
What are the clinical symptoms of septicaemia
- Tachycardia.
- Tachypnoea.
- Prolonged capillary refill- blood being sent to organs
- Low BP (late sign) - common to drop blood pressure due to shock whereas in children this is a pericardia a rest and late sign that they are going to decompensate
- Rash - doesn’t disappear usually, but you can have septicaemia without any rash
What are the clinical symptoms of meningitis
- High temperature
- Headaches
- Vomiting
- Not able to tolerate bright lights = photophobia
- Drowsiness
- Stiff Neck.
What are the symptoms of meningitis in infants
- Tense or bulging soft
- High temperature
- Breathing fast and difficulty breathing
- Extreme shivering
- Cold hands and feet
- Vomiting and refusing to feed
- Blotchy skin getting paler or turning blue
what vaccinations take place at
- 8 weeks old
- 12 weeks old
- 16 weeks old
- one year
8 weeks old
- Diphtheria, tetanus, peruses, polio, Hib, HepB,
- pneumoccoal (13 serotypes)
- Meningococcal group B
- rotavirus, gastroenteritis
12 weeks old
- Diphtheria, tetanus, peruses, polio, Hib, HepB,
- rotavirus
16 weeks old
- Diphtheria, tetanus, peruses, polio, Hib, HepB,
- pneumoccoal (13 serotypes)
- Meningococcal group B
one year
- Men B
- Hib and MenC
- pneumococcal
- MMR
What are the top 3 organisms that can cause problems in young infants before vaccination
- Group B streptococcus
- E.coli
- Listeria
what are the vulnerable groups of people that are predisposes to developing pneumococcal infection
• Absent / non-functional spleen
– Congenital asplenia – born without a spleen
– Traumatic removal
– Hyposplenism (eg sickle cell) – spleen gets ruined as well
- Hypogammaglobulinaemia
- HIV infection
what bacteria does not having a spleen leave you vulnerable to and how do you treat it
• Vulnerable to encapsulated bacteria – Pneumococcus – HiB – Meningococcus • Vaccination • Lifelong penicillin daily
what are the invasive and non invasive features of pneumoccoal
Non invasive • Acute otitis media • Sinusitis • Conjunctivitis • Pneumonia
Invasive • Septicaemia • Meningitis • Peritonitis • Arthritis • Osteomyelitis
What are the symptoms of neonatal tetanus
- Weak
- Lethargic
- Poor suck
- Spams
- Fits
what are the two types of fungi and give examples
Yeasts
- such as candida
Moulds
- such as aspergillum
what are common suerpiical mycosis
• Common o Candidiasis: nappy rash. o Tinea Corporis: ring worm. Treat both with topical antifungal (nystatin). • Occurs in Normal Hosts
what are invasive mycosis
o Candidaemia: extremely preterm infant, effects kidneys and brain.
o Pulmonary Aspergillosis: child with chronic granulomatous disease.
Impaired neutrophil function.
• Opportunistic infections in immunocompromised hosts.
what are the symptoms of malaria
• Can be non-specific
– Fever, lethargy, vomiting, diarrhoea
• Severe disease – Anaemia – Respiratory distress – Cerebral malaria (coma, seizures) – Hypoglycaemia