PSA Flashcards
how to enzyme inducers work
increases P450 enzyme activity -> hastening metabolism of other drugs -> therefore they have a reduced effect and may need an increased dose
how do enzyme inhibotors work
reduced P450 enzyme activity->increased level of other drugs thefore may need doses reducing
common enzyme inducers
PC BRAS
phenytoin
carbamazepine
barbiturates
rifampicin
alcohol (chronic excess)
sulphonylureas
common enzyme inhibitors
AODEVICES
allopurinol
omeprazole
disulfiram
erythromycin
valproate
isoniazid
ciprofloxacin
ethanol (acute intoxication)
sulphonamides
drugs to increase during surgery
if on long term steroids need an IV dose on induction anaesthesia
drugs to stop before surgery
I LACK OP
inuslin
lithium
anticoagulants/antiplatelets
COCP/HRT
K sparing diuretics
oral hypoglycaemics
perindopril and other ACEi
when to stop COCP and HRT before surgery
4w
when to stop lithium before surgery
day before
when to stop potassium sparing diuretics before surgery
day of
when to stop ACEi before surgery
day of
how does erythromycin effect warfarin
increase its effect and PT/INR
how do enzyme inhibitors affect warfarin
increase its effect and PT/INR
when is prophylactic heparin CI
acute ischaemic stroke due to risk of bleeding
SE/CI steroids
stomach ulcers
thin skin
oedema
R and L heart failure
osteoporosis
infection - candida
diabetes
cushings syndrome
cautions/CI NSAIDs
no urine - renal failure
systolic dysfunction - HF
asthma
indigestion
dyscrasia - clotting abnormality
SE anti hypertensives
hypotension
bradycardia with BB and some CCB
electrolyte disturbances with ACEi and diuretics
SE ACE i
dry cough
SE BB
wheeze in asthmatics
worsen acute HF
SE CCB
periheral oedema
flushing
SE diuretics
renal failure
loop diuretics (furosemide)=gout
postassium sparign diuretics (spironolactone)=gynaecomastia
what fluid to give as a replacement
0.9% saline
what fluid replacement to give if patient hypernatraemic or hypoglycaemic
5% dextrose
what fluid replacement to give if patient has ascites
human albumin solution
what fluid replacement to give if a patient bleedint
blood
how much fluid replacement to give
tachyacrdia cand hypotensive: 500ml bolus (250ml if HF) and assess response
if only oliguric: 1L over 2-4h and reassess
what maintenance fluids to give
general = 3L/d, elderly=2L
1L 0.9% saline and 2L 5% dextrose
if normal potassium level add 20mmol KCl to 2 of the bags
if giving 3L give bags 8 hourly
VTE prophylaxis
LMWH e.g. dalteparin 5000 units SC and compression stocks
dont give LMWH if leeding or ishcaemic stroke
no compression stockings in PAD
what antiemetic to prescribe if nauseated
REGULAR
-cyclizine 50mg 8 hourly IM/IV oral UNLESS FLUID RETENTION
- metoclopramide 10mg 8 hrly if HF
antiemetic to prescribe if not nauseated
AS REQUIRED
- -cyclizine 50mg up to 8 hourly IM/IV oral UNLESS FLUID RETENTION
- metoclopramide 10mg up to 8 hrly if HF
when to avoid metoclopramide
patients with parkinsons - may exacerbate sx
young women as risk dyskinesia
what to prescribe in non pain
non regular
PRN: paracetamol 1g up to 6hrly oral
+/- NSAID
what to prescribe in mild pain
regular: paracetamol 1g 6 hrly oral
PRN: codeine 30mg up to 6 hrly oral (can use tramadol)
+/- NSAID
what to prescribe in severe pain
regular: co-codamol 30/500 2 tablets 6hrly oral
PRN: morphine sulphate 10mg up to 6 hrly oral
+/- NSAID
1st line mx neuropathic pain
amitryptiline (at night)
pregabalin 12 hrly
duloxetine in painful diabetic neuropathy
causes of microcytic anaemia
iron deficiency
thalassaemia
sideroblastic anaemia
causes normocytic anaemia
anaemia of chronic disease
acute blood loss
haemolytic anaemia
renal failure - chronic
causes macrocytic anaemia
B12/folate deficiency
excess alcohol
liver disease
hypothyroid
haem: myeloproliferative, myelodysplastic, multiple myeloma
causes hypernatraemia
dehydration
too much IV saline
drugs:
diabetes insipidus
causes high neutrophils (neutrophilia)
bacterial infection
tissue damage: inflammation/infarct/malignancy
steroids
causes low neutrophils (neutropenia)
viral infection
chemo/radio
CLOZAPINE
CARBIMAZOLE
causes high lymphocytes (lymphosytosis)
viral infection
lymphoma
chronic lymphocytic leukaemia
causes low platelets (thrombocytopenia)
REDUCED PRODUCTION
infection - viral
drugs: penicillamine
myelodysplasia, myelofibrosis, myeloma
INCREASED DESTRUCTION
heparin
hypersplenism
DIC
ITP
HUS/thrombotic thrombocytopenic purpura
causes high platelets (thrombocytosis)
REACTIVE
bleeding
tissue damage: infection, inflamamtion, malignancy
post-splenectomy
PRIMARY
myeloproliferative disorders
causes hypovolaemic hyponatraemia
fluid loss: D+V
addisons disease
diuretics
causes euvolaemic hyponatraemia
SIADH
psychogenic polydipsia
hypothyroid
causes hypervolaemic hyponatraemia
HF
renal failure
liver failure
nutritional failure
hypothyroid
causes SIADH
small cell lung tumours
infection
abscess
drugs: CARBAMAZEPINE, ANTIPSYCH
HI
causes hypokalaemia
loop and thiazide diuretics
inadequate intake or intestinal loss (D+V)
renal tubular acidosis
endocrine: cushings, conns
causes hyperkalaemia
drugs: potassium sparing diuretics and ACEi
renal failure
addisons disease
artefact - clotted sample
DKA
what can cause raised urea
kidney injury
upper GI haemorrhage
big/raw steak
causes pre-renal AKI
dehydration - sepsis, blood loss, renal artery stenosis
causes renal/intrinsic AKI
ischaemia
nephrotoxic abx: gentamicin, vancomycin, tetracyclines
ACEi
NSAIDs
radiological contrast
rhabdomyolysis
gout
glomerulonephritides
vasculitis
cholesterol emboli
post renal AKI causes
in lumen: stone
wall: tumour, fibrosis
external pressure: BPH, prostate ca, lymphadenopathy, aneurysm
causes increased ALP
fracture
liver damage
cancer
pagets disease
pregnancy
hyperparathyroidism
osteomalacia
surgery
how to alter levothyroxien based off TSH
<0.5 = decrease dose
0.5-5 = leave as is
>5 = increase dose
causes raised bilirubin only
haemolysis
gilberts and crigler-najjar syndromes
causes increased bilirubin and AST/ALT
fatty liver
hepatitis
cirrhosis
malignancy
metabolic: wilsons, haemochromatosis
HF
causes increased bilirubin and ALP
gallstone
flucloxacillin, coamox, nitrofurantoin, steroids, sulfonylureas
cholangiocarcinoma
primary biliary cirrhosis, sclerosing cholangitis
pancreatic or gastric ca
lymph node
features digoxin toxicity
confusion
nausea
visual halos
arrhythmias
sx lithium toxicity
early: tremor
intermediate: tired
late: arrhythmas, seizures, coma, renal failure, diabetes insipidus
sx phenytoin toxicity
gum hypertrophy
ataxia
nystagmus
peripheral neurpathy
teratogenicity
sx gentamicin toxicity
ototoxic
nephrotoxic
sx vancomycin toxicity
ototoxic
nephrotoxic
how is once daily gentamicin dosing monitored
measure level 6-14h after last infusion started
use a nomogram to look whether need to alter frequency of the dose
how is divided daily gentamicin dosing monitored
take a peak level (1h before dose) and a trough level (just before dose). if peak outside range adjust dose, if trough outside range adjust dose interval
mx major bleed inpatient on warfarin
stop warfarin
5-10mg IV vit k
prothrombin compelx
mx INR <6
reduce warfarin dose
mx INR 6-8
omit warfarin for 2d then reduced dose
mx INR >8
omit warfarin and give 1-5mg oral vit K
mx INR >5 and minor bleeding
IV vit K 1-3mg
STEMI mx
ABC and 15L oxygen non-rebreather mask
aspirin 300mg oral
morphine 5-10mg IV with metoclompramide
GTN spray/tablet
primary PCI or thrombolysis
B blocker (atenolol 5mg) unlesss LVF/asthma
transfer CCU
NSTEMI mx
ABC and 15L oxygen non-rebreather mask
aspirin 300mg oral
morphine 5-10mg IV with metoclompramide
GTN spray/tablet
clopidogrel 300mg oral and LMWH e.g. enoxaparin
B blocker (atenolol 5mg) unlesss LVF/asthma
transfer CCU
acute LVF max
ABC and 15L oxygen non-rebreather mask
sit patient up
morphine 5-10mg IV with metoclompramide
GTN spray/tablet
furosemide 40-80mg IV
if inadequate response, isosorbide dinitrate infusion +/- CPAP
transfer CCU
adverse features in arrhythmia
shock
syncope
myocardial ischaemia
HF
mx arrhythmia with adverse feartures
synchronised DC shock up to 3 attempts
mx broad QRS, regular tachyarrhytmia (likely VT)
amiodarone 300mg IV over 20-60m
mx SVT with BBB
adenosine 6mg, then 12mg, then 12mg
mx tachyarrhythmia with narrow regular QRS
vagal manoevres
adenosine 6mg rapid IV bolus, then 12mg, then 12mg
mx tachycarrhythmia with narrow QRS but irregular
likely AF
rate control=BB
digoxin or amiodarone if HF
anaphylaxis acute mx
A-E and 15L O2 non rebreath mask
remove cause
adrenaline 500mcg 1:1000 IM
chlorphenamine 10mg IV
hydrocortisone 200mg IV
asthma tx if wheeze
amend drug chart allergies
mx acute exacerbation asthma
A-E
100% oxygen via non rebreath mask
salbutamol 5mg neb
hydrocortisone 100mg IV if sev, 40-50mg oral pred if mod
ipratropium 500mcg neb
theophylline if life threatening
mx acute exacerbation COPD
A-E
100% oxygen via non rebreath mask - however ABG ASAP as may need to reduce
salbutamol 5mg neb
hydrocortisone 100mg IV if sev, 40-50mg oral pred if mod
ipratropium 500mcg neb
theophylline if life threatening
abx if infective exacerbation
CURB 65 criteria
confusion (AMT<8)
urea >7.5
RR >30
BP <90
age >65
CURB 65 interpretation
0/1 = at home
>/= 2 = at hospital
>/= 3 = consider ITU
pneumonia mx
A-E
high flow oxygen
abx : amoxicillin or coamox
paracetamol
IV fluids
PE mx
A-E
high flow oxygen
morphine 5-10mg IV and metoclopramide 10mg IV
LMWH
GI bleeding mx
A-E and oxygen 15L non-rebreath mask
2 large bore cannulae
catheter
crystalloid or colloid
cross match 6 units
correct clotting abnormalities
endoscopy
stop cause: nsaids, aspirin, warfarin, heparin
cal surgeons if sev
mx bacterial meningitis
A-E
high flow oxygen
IF fluids
dexamethasone IV
LP +/- CT head
cefotaxime IV
consider ITU
max seizures
A-E
recover position
oxygeb
mx status epilepiticus
A-E
recovery position
oxygen
lorazepam 2-4mg IV or diazepam 10mg IV or buccal midazolam IV
repeat loraz after 2m x 2
inform anaesthetist
phenytoin
intubate and propofol
mx acute stroke
A-E
CT head to exclude haemorrhage
consider thrombolysis
aspirin 300mg
transfer to stroke unit
mx hypoglycaemua (BM <3)
eat sugary snack
IV glucose 100ml 20%
if no cannular IM glucagon 1mg
mx hhyperglycaemia
A-E
IV fluid: 1L stat, 1L over 1hr, 1L over 2h, 1L over 4h, 1L over 8h,
sliding scale insulin
look for trigger: infection, MI, missed insulin, monitor BM/K/pH
mx AKI
A-E
cannula, catheter, monitor fluids
IV fluid: 500ml stat then 1L every 4h
look for cause and complications
monitor U+E and fluid balance
mx chronic HF
ACE i
BB
if inadequate: candesartan, isosorbide mononitrate, spironolactone
mx HTN
- <55= ACEi
>55 or afrocaribean=CCB - ACEi and CCB
- add indapamide
AF rhytm control
if young/sx/first episode/due to precipitant
cardiovery: electrical or amiodarone, need anticoag first if >48h since onset