Acute scenarios Flashcards
Narrow QRS complex (3 or below small squares/0.12s) - regular
SVT
Vagal Manouvres
Adenosine 6mg rapid bolus
if unsuccessful –> 12 mg
If unsuccessful –> 12mg
Adenosine slows conduction through the AV node
Narrow QRS complex tachycardia - irregular
AF
Control rate: B-blocker or diltiazem
Digoxin or Amiodarone if evidence of HF
Broad complex tachycardia (more than 3 small squares/0.12s) - regular
VENTRICULAR TACHYCARDIA
300mg Amiodarone IV over 20-60mins
then 900mg over 24hrs
Amiodarone is a potassium channel blocker
Torsades de pointes
Magnesium IV 2g over 10 mins
DKA : presentation
polyuria, polydipsia, abdo pain, vomiting, dehydration
DKA: Diagnosis
Serum glucose >11 or known diabetic
Serum ketones >3 urine ketones >3+
Metabolic Acidosis pH <7.3, Bicarb <15
DKA: Pathophysiology
Insulin promotes glucose and potassium uptake into cells
Insulin deficiency –> Cells use ketone metabolism instead of glucose. Hyperglycaemia
Hyperglycaemia & ketosis –> osmotic diuresis, metabolic acidosis and deranged electrolytes
DKA: High risk patients
Young people & elderly (incr risk cerebral oedema)
Pregnancy
Heart/renal failure
DKA: Management
Normalise fluids and electrolytes: 0.9% saline bolus 500ml over 15mins
40mmol potassium replacement
10% glucose infusion if <14
Switch off ketosis: IV fixed rate insulin 0.1U/kg/hour (max 15U/hr)
Continue long acting insulin alongside IV infusion
Identify and treat underlying cause
Monitor: FBC, VBG, U&Es, BM, ketones, GCS
Monitor for signs of cerebral oedema or fluid overload
Use local hospital DKA protocol for fluid and insulin replacement + specific monitoring
When is a DKA resolved?
Capillary ketones <0.6
blood pH >7.3
Hyperkalaemia: why is it dangerous and what is the treatment aim?
Can cause sudden death from cardiac arrhythmias.
Treament priority is to stabilise the myocardium, reduce potassium levels and address the underlying cause
What K+ level would signify hyperkalaemia?
5.5-5.9 = mild
6-6.4 = moderate
>6.5 or >6 & septic = severe
Causes of hyperkalaemia?
Failure or potassium excretion +/- inappropriate potassium input
Renal failure +/e precipitating factor e.g. nephrotoxic drugs, sepsis
Potassium sparing diuretics, ACEi, tumour lysis syndrome, rhabdomyelosis, adrenal insufficiency
Moderate/severe hyperkalaemia Management:
Stop any K+ sources - meds
Protect the heart: 10ml 10% Calcium Gluconate with cardiac monitoring (No effect on K+ serum level but cardioprotective)
Shift K+ into cells: 10U Actrapid in 50ml 50% dextrose over 10 mins
Salbutamol Neb
Remove K+ from body: Calcium Resonium PO/PR - binds K+ in the gut to prevent absorption (can take up to 12 hrs to work)
Hyperkalaemia - ECG Changes
Peaked T waves
Broad QRS
Bradycardia
absent/flattened P waves