Key PSA facts Flashcards
Management of croup
- Drug : dexamethasone
- Dose : 150 micrograms / kg
- Route : Oral (PO) or IV
- Frequency : once only
Pain relief in an MI
- Drug : morphine
- Dose : 2.5-5mg in elderly (5-10mg otherwise)
- Route : slow IV infusion
- Frequency : once only
Fluid given in the initial treatment of DKA if systolic BP is <90
- Drug : sodium chloride 0.9%
- Volume 500 mililitres (ml)
- Route : intravenous (IV)
- Rate : Infusion over 10-15 minutes
First line medication for severe acute asthme
- Drug : salbutamol
- Dose : 5 miligrams (5mg)
- Route : Nebulised (NEB)-oxygen-driven
- Frequency : Repeat every 20-30 min or as required
Management of benzodiazepine overdose
- Drug : Flumazenil
- Dose : 200 micrograms
- Route : intravenous injection
- Duration : Over 15 seconds
Management of aspirin overdose if presenting within an hour
- Drug : activated charcoal
- Dose : 50g
- Route : oral (PO)
- Frequency : once only
Management of GORD in the medium-long term
- Drug : lansoprazole
- Dose : 30mg
- Route : oral (PO)
- Frequency : once daily
Normal dosing of methotrexate in moderate - severe RA
-> 7.5mg once weekly
-> Max 20mg !!!!
Normal dosing of glicalazide
- Initially 30mg before adjusting (OD)
- Max 120mg per day
Normal dose of ibuprofen
- 400mg TDS
Normal dosing of lisinopril
- Maintenance is usually 20mg OD
- Max 80mg
Normal dosing of metformin
Usually 500mg TDS
Drug likely to cause diarrhoea in the management of refeeding syndrome
Magnesium glycerophsophate
what 2 medications, if prescribed together can cause serious cardiac SE and how would it present
VERAPAMIL + BB
Bradycardia
Hypotension
1st degree heart block
Pt might present with episodes of collapse
How does the medication of a patient with know Addison’s need altering when acutely unwell
Double the dose of corticosteroid
Medications likely to contribute to UGIB
- NSAIDS
- Oral bisphosphonates (e.g. alendronic acid)
- Oral steroids (e.g. prednisolone)
Medication known to cause hyperglycaemia
Oral Prednisolone
Thiazide diuretics (e.g. bendroflumethazide)
Fluids used for resuscitation in hypotensive and tachycardic patient
500ml 0.9% sodium chloride IV
Management of acute anaphylactic reaction in an adult / child 12 or above
500 micrograms adrenaline IM (0.5 mL of 1:1000).
Management of opioid toxicity
Naloxone 400 micrograms (mcg) IV
Management of acute pulmonary oedema
- IV furosemide 40mg once only
Management of anaphylaxis in a child aged 6-11 yrs
- IM adrenaline 300 micrograms
Management of ascites due to liver cirrhosis
- Spironolactone 100mg OD oral
Management of severe hypoglycaemia causing reduced consciouss and seizures
- 20% glucose 100ml IV
Both of these are equivalent to 15-20g glucose
Adverse effect of ondasetron
QT interval elongation
Antibiotic that can increase the effect of warfarin and in turn increase the risk of bleeding
- Macrolides (erythromycin, clarithromycin)
What type of diuretic has the highest incidence of causes hyponatraemia ?
Thiazide (Indapamide, bendroflumethazide)
What should be checked following blood transfusion to check for acute transfusion reaction
HR, BP and temperature, 15 mins later
what should be checked to monitor for possible adverse reaction following insulin-glucose infusion for hyperkalaemia ?
- Capillary blood glucose due to risk of hypoglycaemia
what should be checked after 4 days of antiobitoic treatment for pneimonia to check response
CRP
what is the best way to monitor the therapeutic effects of diuretics in fluid overload due to HF
Daily weights
what is the most appropraite way to monitor for the adverse effects of prescribed oxygen therapy in a smoker ?
- ABG after 30 mins due to risk of hypercapnia
What drugs are directly nephrotoxic ?
- Aminoglycosides (e.g gentamycin, vancomycin, amikacin)
- Amphotericin
- Cytotoxic chemo (e.g cisplatin)
What drugs contribute to AKI due to causing renal ischaemia, renal hypoperfusion, volume depletion
- Diuretics = volume depletion
- Immunosuppression (ciclpsporin, tacrolimus) = renal ischaemia
- Radiocontrast media = Renal ischaemia
- NSAIDs / COX-2 inhibitors = renal hypoperfusion
what fluids are prescribed in an AKI
Sodium chloride 0.9% IV
When would sodium bicarbonate 1.25% be the fluid of choice prescribed in AKI ?
AKI WITH hypovolaemia and metabolic acidosis
What is the most sensitive indicator of hypovolaemia suggest AKI is caused by dehydration ?
Postural rise in HR of >= 30bpm.
what medications should be stopped in an AKI?
D : Diuretics
A : ACEI/ARB
M : Metformin
N : NSAIDs
Allopurinol can accumulate, max dose 100mg
what Abx are safe to use in AKI ?
- Cephalosporins (e.g. ceftazidime)
- Carbapenem (e.g. meropenem)
what diuretic can be used in AKI for fluid overload
- Furosemide
- DO NOT use combination diuretics
- Thiazide diuretics are ineffective if eGFR <30
why are ACEI stopped in AKI ?
Can cause hyperkalaemia
when should ACEI / ARBs NOT be used
- Bilateral renal artery stenosis
- Renal artery stenosis if one kidney
- Widespread vascular disease
Main CI to heparin and erythromycin
- Heparin = not appropriate in ischaemic stroke
- Erythromycin = increases effects of warfarin and so INR
SE of steroids
S : Stomach ulcers
T : Thin skin
E : oEdema
R : Right and left sided HF
O : Osteoporosis
I : Infection
D : DM
S : cushing’s Syndrome
SE / CI to NSAIDs
N : No urine (renal failure)
S : Systolic dysfunction (HF)
A : Asthma
I : Indigestion
D : Dyscrasia (clotting abnormalities)
Specific SE to thiazide diuretics and spironolactone
- Thiazide = gout
- Spironolactone = gynaecomastia
what is anti-emetic is given 1st line
Cyclizine ?
when is cyclizine CI and what is given instead >
- HF !!!
- Metaclopramide
When is metaclopramide and haloperidol not given as anti-sickness ?
- Parkinson’s
what diuretics can cause hypokalaemia ?
- Loop diuretics (furosemide)
- Thiazide diuretics (bendroflumethazide, indapamide)
what medications can cause hyperkalaemia
- ACEI
- Potassium sparing dieuretics (spironolactone, amilordide)
- Heparin !
- Tacrolimus !
what medications should be reviewed in a confused elderly patient ?
- Antimuscarinics (e.g. bumetanide)
- Anticholinergics (cyclizine)
- Opioids
- Benzos
what should be avoided in asthmatics ?
- BB
- NSAIDs
what should be stopped in active infection
Methotrexate
Causes of hyponatraemia
- Hypovolaemic : D&V, Addison’s, diuretics
- Euvolaemic : SIADH, hypothyroid, psychogenic polydisplasia
- Hypervolaemic : HF, renal failure, nutritional
Causes of hypernatraemian
- Dehydration
- Drugs (e.g. lithium)
- Drips
- DI
Causes of hyperkalaemia
- Drugs (K+ sparing diuretics, ACEI)
- Renal failure
- Endocrine (addison’s)
- Artefact
- DKA
Causes of hypokalaemia
- Drugs (loop/thiazide)
- Inadequate intake or GI loss (D&V)
- Renal tubular acidosis
- Endocrine (Cushing’s/conn’s)
How can the cause of renal failure be determined ?
Based on relative increase of urea compared to creatinine
- Pre renal : Urea rise»_space; creatinine.
- Intrinsic : Urea rise «_space;creatinine.
- Post renal : Urea rise «_space;creatinine + bladder / hydronephrosis may be palpable
How can LFTs be interpreted ?
- Hepatocyte injury : bilirubin and AST/ALT
- Cholestasis / obstruction : ALP
- Synthetic function : albumin, vitamin K dependent clotting factors (1972)
what can an isolated raised ALP suggest ?
ALKPHOS
- A : any fracture
- L : Liver damage (post hepatic)
- K : Kancer
- P : Paget’s disease of bone and Pregnancy
- H : Hyperparathyroid
- O : Osteomalacia
- S : Surgery
Major bleeding + on warfarin
STOP WARFARIN
Give 5-10mg IV vit K
Give prothrombin complex
INR 5-8 but no bleeding
Omit for 2 days
Reduce dose
INR 5-8 minor bleeding
Omit
1-5mg IV vit K
INR >8 no bleeding
Omit
1-5mg PO vit K
INR >8 + minor bleeding
Omit
1-5mg IV vit K
Management of tachycardia with adverse features
Synchronised DC shock up to 3 attempts
Management of tachycardia with BROAD QRS + regular
- If ventricular tachycardia : Amiodarone 300mg IV over 20-60 mins
- If previously confirmed SVT with BBB manage as regular narrow complex tachy
Management of tachycardia with IRREGULAR BROAD QRS
Seek expert help
Management of tachycardia with narrow regular QRS but no adverse signs
- Vagal manoeuvres
- Adenosine 6mg rapid IV bolus up to 18mg
Management of tachycardia with narrow irregular QRS
Probably AF -> rate control with BB or diltiazem
Example of pharmacodynamic drug interactions
- Sertraline and warfarin
- Warfarin and vit K foods
- ACEI and K+ containing salt
- Verapamil and BB
- Warfarin and NSAIDs
- Aminoglycosides and loop diuretics
Example of pharmacokinetic drug interactions
- Lithium salt and ramipril
- Rifampicin and COCP
- Warfarin and erythromycin and clarithromycin
what antibiotic would require extra protection in someone on the COCP
Rifampicin
If takin levonorgestrel emergency contraception but on carbamazpine for epilepsy what steps need to be taken ?
Double the dose
What can inhibit P450 enzyme system
- Isoniazid
- ciprofloxaciN
- etHanol
- azole antIfungals
- Buprion
- erythromycIn
- dilTiazem
- Omeprazole
- gRapefruit juice
- sSri
What can induce P450 system
- cIgarette smoke
- phenytoIn
- Dexamethasone
-barbitUrates - Carbemazepine
- Ethanol
- Rifampicin
- St John’s wort
Effect of St John’s wort with certain medications
- Cause organ transplant rejection if taken with ciclosporin
- Increase risk of serotonin syndrome if given with citalopram
- Decrease INR in pts on warfarin, increasing VTE risk
what is diclofenac CI in ?
IHD
Important info to tell pts commenced on labetalol
Report ANY non specific itching due to association with severe hepatocellular injury
Important information to tell pts on amiodarone
- Avoid direct sunlight and wear wide-spectrum suncreen due to risk of phototoxic reactions
when writing a prescription for an ACEI, when should they be given and why
- Nightly !!
- Due to risk postural hypotension
what needs checking prior to commencing vancomycin and why ?
- Creatinine
- Dose is adjusted based on kidney function
- Nephrotoxicity and ototoxcicity = biggest SE
Important parameter to measure before commencing vancomycin
Serum creatining -> guides dosing + most common SE = nephrotoxicity and otoxicity
Important parameter to measure before commencing statin
- > ALT as used in caution in people with liver disease
Key facts regarding monitoring of lithium therapy
-> Check serum levels 12 hrs post dose
-> Toxicity effects manifest at 1.5mmol/l
-> FBC checked every 1-2 wks until stabilised
-> Routine lithiium level checks weekly, after each dose change and then 3mnthly after stabilisation
Change in what electrolyte will increase risk of lithium toxicity
- Reduced sodium
Key points regarding methotrexate monitoring
- FBC checked every 2-3 mnths once stabilised
- Drop in WCC / plts = stop immediately
- If LFTs abnormal = stop immediately
what is required at baseline before commencing amiodarone and why
- ECG
- CXR - risk of pulmonary toxicity
- U&Es
- TFTs : also required every 6 mnths
- LFTs
what needs to be checked at baseline before commencing olanzapine ?
Fasting blood glucose due to risk of hypergylcaemia and DM
what needs monitoring in digoxin ?
Serum creatinine due to risk of renal dysfunction
What needs checking at baseline when commencing SV ?
ALT due to association with hepatotoxicity
How long are weekly FBCs required when commencing clozapine
18 wks
Adverse drug reactions to gentamicin and vancomycin
Nephrotoxicity
Otoxicity
Adverse reaction to cephalosporins or ciprofloxacin
Clostridium difficile
Three adverse reactions to ACEI
- Hypotension
- Hyperkalaemia and hence AKI
- Cough
4 adverse reactions to BB
- Hypotension
- Bradycardian
- Wheeze in asthmatics
- Worsens acute HF
4 adverse reactions to CCB
- Hypotension
- Bradycardia
- Peripheral oedema
- Flushing
3 adverse reactions to aspirin
- Haemorrhage
- Peptic ulcers and gastritis
- Tinnitus in larger doses
6 adverse reactions to digoxin
- N&V
- Diarrhoea
- Blurred vision
- Confusion
- Drowsiness
- Xanthopsia - ‘halo’ vision
4 adverse effects of amiodarone
- Pulmonary fibosis
- Hypo and hyperthyroid
- Skin greying
- Corneal deposits
Early and intermediate adverse effects of lithium
- Early = tremor
- Intermediate = Tiredness