Ultimate BNF Flashcards
(512 cards)
Amiodarone indication
Arrythmias
Amiodarone dosage
200mg td 7 days
200mg bd 7 days
200mg od continue
Amiodorone Side effects
Reversible corneal deposits, Phototoxicity, Jaundice, Slate grey discolouration, Taste disturbance, Vomiting, Hyper/Hypothyroidism, Pulmonary toxicity Nausea, Tremor, Sleep disorder
Amiodarone monitoring
LFT Thyroid function test before and 6 monthly Serum Potassium concentration before Chest X ray before ECG/Resuscitation during IV
Half life Amiodarone
Weeks/months
Amiodarone interactions
Warfarin inhibited by, (anticoagulant effect up)
BB, (bradycardia, AV block, Myocardial depression)
Lithium, (Ventricular arrhythmias)
Digoxin conc increase by,
Digoxin indication
Cardiac Glycoside used in AF, AF, tachycardias, HF
Digoxin mechanism action
Positive ionotrope - increases force of myocardial contraction,
reduces conductivity within AV node
Desired serum concentration Digoxin
1-2mcg/L
toxic = 1.5-3
Digoxin monitoring
Serum electrolytes (potassium) and renal function
Risks of Digoxin and management of risks
Digitalis toxicity (esp elderly) Made worse by hypokalaemia so give Potassium sparing diuretics or potassium supplements
Side effects of Digoxin
Nausea, Vomiting, Diarrhoea, Dizziness, Blurred vision
Digoxin interacts with
These increase Digoxin plasma conc:
Amiodarone, Erythromycin, Calcium Channel blockers
These decrease Digoxin plasma conc:
Rifampacin, SJW
If hypokalaemia occurs with Loop/Thiazide risk toxicity
Lithium indication
Mania, Bipolar disorder, Recurrent depression
Desired Lithium serum concentration
- 4-1mmol/Litre
1. 5mmol and above is toxic
Lithium toxicity presents as
Tremor, Ataxia (shake), Dysarthria (speech problem), Nystagamus (rapid involuntary eye movements), Renal impairment, Convulsions, Blurred vision
Monitoring on Lithium
Lithium serum conc (3months)
Renal/Thyroid function (6-12 months)
Maintain sodium levels
Counselling with Lithium
Adequate fluid intake, avoid diet’s sodium increase or decrease
Interaction of Lithium
Excretion of Lithium reduced by: ACEI, Loops/Thiazides, probably NSAIDs
Risking toxicity/sodium depletion with Diuretics
Amiodarone: Ventricular arrhythmias
Methotrexate indication
Rheuatoid Arthiritis, Crohns, Malignant disease, Psoriasis
Problems with methotrexate and how to spot them
Blood dyscrasias: Sore throat, signs of infection, bruising, mouth ulcers
Liver toxicity/cirrhosis: Nausea, voimiting, abdominal discomfort, dark urine
Pulmonary toxicity: SOB, cough, fever
Methotrexate monitoring
FBC
LFT (and renal)
Methotrexate interactions
Increased methotrexate with Aspirin, NSAIDs
Dose of methotrexate
7.5mg once weekly (max 20mg/week)