Medicine Flashcards
Indications and relative indications for NIV
Indications:
Respiratory failure APO, COPD
Relative:
Asthma
ARDD
Pneumonia
Children
Pre-oxygenation
Physiological benefits of BiPAP in COPD
Reduces WOB
increases end inspiratory volume
EPAP prevents atelectasis
Improved CO2 elimination
Closed circuit (consistent FiO2)
Allows spontaneous ventilation
Alerts available
In COPD, reduces death, LOS & intubations
Advantages and disadvantages of NIV in asthma
Adv:
Extrinsic PEEP reduces WOB
IPAP improves TV
Reduce intubations (allow drugs to work)
Disadv:
Delay intubation (further deterioration)
Increased WOB if inappropriate settings
Barotrauma (pneumothorax)
Difficult to clear secretions
What constitutes massive PE
Sustained SBP <90
Requiring inotropes
Pulseless
Unstable sustained bradycardia
Thrombolysis in PE
Alteplase 1.5mg/kg (10mg over 2 minutes then rest over 2 hours)
50mg bolus if arrested
UFH 80u/kg load IV then IV 18u/kg/hr adjusted to aPTT
ECG changes in PE suggestive of RV strain
RAD
RBBB
S1Q3T3
Non-specific ST changes
Dominant R wave in early precordial leads
ECHO changes in PE
RV dilation (bigger than LV in apical view)
Dilated non-collapsing IVC
RV wall hypokinesis
McConnell sign (apex spared)
CXR changes in PE
Cardiomegaly
Elevated hemi diaphragm
Wedge infarct
Westermark sign (oligaemia)
Hamptons Hump (domed pleural opacity)
Fliesher sign (prominent PA)
Diagnosing exudate on pleural tap
Pleural protein:serum >0.5
Pleural LDH:serum >0.6
Pleural LDH >2/3 normal limit
Total protein >30g
pH <7.35
If pH <7.2 implies empyema and needs complete drainage
Pleural exudate vs transudate causes
Exudate:
Cancer
Empyema
Para-pneumonic
RA/SLE
Haemothorax / Chylo
Transudate:
Failures
Meig syndrome
Sarcoidosis
RF for re-expansion pulmonary oedema
Young <30
Collapse >1 week
>3L pleural fluid
Suction use
Rapid drainage (1.5L/hr)
2 pneumonia scoring systems
CORB (more specific)
Confusion
O2 <90%
RR >30
BP <90
SMART-COP (more sensitive)
SBP <90
Multilobar
Alb <35
RR 30 (25 if over 50yrs)
Tachycardia 125bpm
Confusion
O2 <90% (93% if over 50yrs)
pH <7.35
Distinguish mild, moderate and severe non-proliferative DM retinopathy
Mild: some micro-aneurysms
Mod:
<20 micro-aneurysms
Hard exudates
Cotton wool spots
Venous beading
Severe:
Micro-aneurysms in all 4 quadrants
Venous beading in 2 quadrants
AVM
Why pregnancy increased RF for DKA
Vomiting and nausea
Baseline metabolic alkalosis
Lower fasting BSL (relative reduced insulin)
Higher glucagon levels
Skin changes with DM
Necrobiosis lipoidica (yellow with red border)
Acrochordans (skin tags)
Carotenoderma (yellow deposits hands)
Scleroderma Adultorum (thick skin)
Diagnostic criteria for HHS
BSL >30 with ketones <3
Dehydration
Osmolality >320
Management HHS
NSaline 1L/hr and adjust
Aiming fall BSL <5 per hour
Replace 50% losses in 12 hours (200ml/kg)
If Na rising greater than 2.5 per 5.5 BSL, increase fluids
0.45% saline if BSL or osmolality not falling
VTE prophylaxis
Insulin 0.05units per kg only if raised ketones
T1DM diagnostic bloods
Insulin antibody
GAD antibody
Islet cell antibody
Fasting C-peptide
TFT
Coeliac screen
ZnT8 antibody
Risk factors for cerebral oedema in DKA
<5 years
Long standing poor control
First presentation
Received sodium bicarbonate
Tx:
Head up
Reduce fluids by 1/3
Empirical mannitol 1g/kg (0.5g/kg kids)
What classifies severe DKA
GCS <12
Ketones >6
Unstable
Bicarb <5
Hypokalaemic to start
pH <7
RAGMA