Resuscitation fluids?
Crystalloids (common Hartmann’s, NaCl 0.9%, Plasma-Lyte 148 delivered in boluses of 250-500ml over 10-15 minutes
Daily requirements in maintenance fluids?
How to calculate daily requirements in obese patients?
If a patient is obese, calculate requirements using ideal body weight
Replacement fluids aims?
Replacement fluids aim to rehydrate patients from their pre-existing losses and keep up with ongoing losses
How to calculate total water body weight?
Multiply patients’s body weight by 0.6 (men) or 0.5 (women)
Fluid distribution in 70kg man?
How much urine does a healthy person pass?
A healthy person passes approximately 1ml/kg/hr of urine
In fluid replacement, what is the aim for minimum urine output?
0.5ml/kg/hr
How to assess fluid status?
History, obs, clinical examination of dehydration/overload (skin turgor, JVP, mucous membranes, CRT), daily weight, fluid balance charts
Which drug can’t you have with beta blockers
Verapamil
Why avoid NSAIDs/ibuprofen in asthmatics?
Bronchospasm
Does aspirin worsen asthma?
Rarely
If a woman has migraine with aura, what don’t you prescribe?
COCP
What shouldn’t you use following acute ischaemic stroke?
LMWH due to risk of haemorrhagic transformation
Which drugs cause hypokalaemia?
Thiazides and loop diuretics
Which drugs cause hyperkalaemia?
ACEi, aldosterone inhibitors
Metoclopramide vs domperidone?
Metoclopramide crosses BBB and worsens parkinsonism
ACEi side effect
Dry cough due to bradykinin build up
Why shouldn’t you take ibuprofen on an empty stomach?
Ibuprofen inhibits prostaglandin synthesis needed for gastric mucosal protection so may cause inflammation and ulceration
Why is ibuprofen nephrotoxic?
Ibuprofen also reduces renal artery diameter, thus blood flow, thus kidney perfusion and function.
ACEi in CKD?
ACE inhibitors inhibts angiotensin-II which preserves GFR when renal blood flow is reduced.
Can you combine ibuprofen and ACEi?
Combining ibuprofen and ACE inhibitors are a double threat to renal perfusion by tightening the afferent artery and opening the efferent artery.
Oxybutynin in elderly?
Antimuscarinic mainly used for urinary frequency/urgency and can cause confusion in elderly
Tramadol use in elderly
Avoid - causes confusion