PASSMED + MISCELLANEOUS Flashcards
Which immunoglobulin is first to be secreted in response to an infection?
IgM
What type of bacteria is E. coli?
aerobic gram-negative rod
What is the mechanism of action of loop diuretics (furosemide)?
Prevents reabsorption of sodium, chloride, and potassium by inhibition of the cotransporter in the thick ascending loop of Henle. This causes significant diuresis.
What drugs exhibit zero order kinetics? What is zero order kinetics?
phenytoin, alcohol and salicylates
- drugs in which the clearance rate depends on an easily saturated enzyme system. As soon as the system is saturated, the rate of clearance plateaus, and does not vary no matter how much drug is present. This results in a constant rate of elimination predisposing to high levels of the drug and toxicity.
What are the following associated with; (i) HLA-A3 (ii) HLA-B5 (iii) HLA- DR3 (iv) HLA-DR4 (v) HLA-B27?
(i) haemochromatosis
(ii) Behcet’s disease
(iii) dermatitis herpetiformis
(iv) diabetes mellitus and rheumatoid arthritis
(v) ankylosing spondylitis
What is the investigation of choice to confirm a diagnosis of bronchiectasis?
High resolution computerised tomography
What does the interior mesenteric vein drain into?
Splenic vein
Which part of the jugular venous waveform is associated with the closure of the tricuspid valve?
c wave
Name a common Parametric test.
Students T-test
Which pathogen is responsible for the majority of cases of croup?
Parainfluenza
Where in the atrium is the atrial myxoma most likely to be attached?
fossa ovalis
What is the blood supply of the AV node in the majority of patients?
In 80% of patients, the atrioventricular node is supplied by the right coronary artery
Which cells express IgE receptors on their cell surface?
Mast cells and basophils
What is the most common type of colorectal carcinoma?
adenocarcinoma
What is the blood supply of the parathyroid gland?
the super and inferior thyroid arteries
Which nerve is responsible for the sensory innervation of the tonsillar fossa?
glossopharyngeal
What cells mediate hyperacute organ rejection?
B cells
What are the risk factors for developing active tuberculosis?
- silicosis
- chronic renal failure
- HIV positive
- solid organ transplantation with immunosuppression
- intravenous drug use
- haematological malignancy
- anti-TNF treatment
- previous gastrectomy
What does the paramesonephric (Mullerian) duct give rise to?
gives rise to the fallopian tubes, uterus and upper 1/3 of the vagina in females, whereas it regresses in males
Define (i) gravidity (ii) parity.
(i) total number of confirmed pregnancies, regardless of the outcome
(ii) number of births post 24 weeks gestation
What supplements are women advised to take during/pre-pregnancy?
vitamin D and folic acid
What is defined as (i) conception (ii) EDD?
(i) 2 weeks after the first day of LMP with a regular 28 day cycle
(ii) naegele’s rule = add 9 months + 7 days of LMP (pregnancy 38 wks from conception and 40 from LMP)
When is a trisomy 21 screen performed? What defects are associated?
At 8-14 weeks
- prevalence increases with increasing age, most are secondary to non-disjunction of chromosome 21 at meiosis
- 46% have VSD or ASD
What is the second most common kind of trisomy? Describe its features.
trisomy 18 (Edward’s syndrome)
- survival beyond 1 year is rare
- small chin, low-set ears, rocher bottom feet, VSD
What advice is given to women with pre-existing diabetes prior to conception?
- weight loss (reduce BMI less than 30)
- folic acid 5mg OD in month prior + to 13 wks
- Alcohol/smoking/exercise and diet
- Screening: retinal and nephropathy
How is shoulder dystocia managed?
- McRoberts manoeuvre
2. Episiotomy allows for better access for internal manoeuvres
What are the (i) risk factors (ii) diagnostic criteria for gestational diabetes?
(i) BMI more than 30, prev macrosomic baby (more than 4.5kg), previous GDM, family origin with high prevalnce DM (S. Asian, Black Carribean, Middle eastern)
(ii) fasting glucose more than 5.6 mmol/L
2 hr plasma glucose more than 7.8 mmol/L
What are the symptoms of pre-eclampsia?
- severe headache, especially frontal
- problems with vision; blurring and flashing
- severe pain just below ribs (epigastric, RUQ)
- vomiting and nausea
- sudden swelling of FACE, hands, or feet
What increases risk of pre-eclampsia? What are these woman advised to take?
- hypertensive disease in previous pregnancy, CKD, autoimmune, DM, chronic HTN
- take 75 mg aspirin daily from 12 wks gestation until delivery
What should pregnant females with chronic hypertension have their BP medication switched to? Should they also add anything else?
- switch to labetolol and/or methyldopa
- add 75mg aspirin from 12 wks gestation
How is pregnancy induced hypertension managed?
Methyldopa or nifedipine (NOT labetolol)
What is eclampsia? How is it managed?
tonic-clonic seizure + pre-eclampsia
- an obstetric emergency
IV magnesium sulphate to treat and prevent seizures
- stop if RR less than 12 or tendon reflex lost or urine output less than 20ml/hr
- if develop toxicity give calcium glucoronate infusion
What are 3 dangerous causes of antepartum haemorrhage?
- abruption
- placenta praevia
- vasa paevia
What is primary sclerosing cholangitis strongly associated with? What is the initial diagnostic investigation?
Ulcerative colitis
- MRCP and shows a beaded appearance of the bile duct
What 3 histological features suggest carcinoma in all sites of the body?
Nuclear enlargement
Hyperchromasia
Pleomorphism
What is the first line treatment for an overactive bladder with urge incontinence?
Immediate release anticholinergics (oral oxybutynin)