Gen - OSCE Facts / Questions Flashcards
Causes of hyperthermia
Infections - Sepsis, CNS infection, endocarditis, tropical disease
Environment - heat stroke
Endocrine - Thyroid/Phaeo
CNS - Hypothalamic stroke
Drugs - Serotonin, NMS, e, cocaine, Salicylate, benzo withdrawal
Hyperthermia effects on the CVS
Tachy and increased SV, along with vasodilation
Decreases MAP
Fluid compartment shift - dehydration, situation worsens, CVP falls
Worsening tachy, met acidosis —> reduced contractility, SV and MAP
Hypotension and infarct
Features of Serotonin syndrome
triad of:
Neuromuscular excitability - clonus, hyper reflex is, rigid
Autonomic dysfunction - hyperthermia, tachy, sweat, flushing
CNS dysfunction - anxiety agitation, confusion coma
Diagnosis of Serotonin syndrome
Clinical - features emerge when starting or raising the dose of a serotonergic drug, or second drug added
Also - Hunter criteria
Drugs (and catergories) causing Serotonin syndrome
Prevent Re-Uptake - SSRI, SNRIs, MAOI, TCA, tramadol/pet hiding
Stimulate release - Tramadol, MDMA, amphetamine
Other - Lithium, Tryptothan
Treatment of Serotonin Syndrome
Stop the drug
Sedation/control agitation
Active Cooling
Control HR/BP
Monitor coag/renal
Antedotes: Cyproheptadine (oral 5HT2a)
Chlorpromazine
cooling methods
Passive - Cool the room, take clothes off
Active external - wet towels, ice pack, fan, pads
Active interval - Cool if fluids, Cavity lovage, RRT, CPB, ECMO
Fever, hyperthermia and hyper pyrexia
Fever - hypothalamic upreguation of set point - cytokine mediated, responds to NSAIDS
Hyperthermia - failure of temperature regulation, does not respond
Hyperpyrex - >41C
Types of Lactic Acidosis
Type A - hypoperfusional
B - normal perfusion
B1 - underlying disease (ketoacidosis, leukaemia, lymphoma)
B2 - Drugs (cyanide, beta-agonists, methanol, ethanol, methanol)
B3 - Inborn errors of metabolism
Causes of a raised CK
Muscular dystrophies Myosotis, Polymyositis, MH Acute MI Cerebrovascular disease Neurosurgery
Rhabodomyolysis, hypothyroidism (muscle loss)
Metabolic features of PRIS
Bradycardia
RBBB
Met acidosis
Raised lactate
Hepatic and renal failure
Definition of PRIS
Acute refractory bradycardia
Plus
Met acidosis (BE >10)
Rhabdo
Hyperlipidaemia
Fatty liver
Mechanism of PRIS
Direct mitochondrial resp chain inhibition
Impaired fatty acid metabolism at mitochondria
Risks of PRIS
Young (paeds)
Severe critical illness (CNS or Resp origin)
TBI
Excess catecholamines
Excess glucocorticoids
Poor carbohydrate intake
Subliminal mitochondrial disease
Tests for PRIS
Consider a serum triglyceride level
Dose range of PRIS
4mg/kg/hour
Treat PRIS
Stop propofol
Switch to alternative sedation agent
HD/HF with CVS support
Early awareness, monitoring
CSF finding of GBS
Raised protein
Differential of weakness
Brain stem lesions - Acute disseminated encephalomyelitis
Spinal Cord - transverse myelitis
Polyneuropathy - Infectious - Polio Diptheria, Lyme
Polyneuropathy - Non infection - porphyria
NMJ - Myasthenia, botulism
Muscle - rhabdo, myosotis
Electrolytes - low K, PO3
Ix of GBS
CSF - protein
NCS - demyelination from atonal types
MRI brain and spine - cord compression, stem lesions
Anti ganglioside antibodies
Infection - campylobacter, mycoplasma, HIV
When to tube GBS
Vital capacity <15ml/Kg
Bulbar weakness, can’t protect airway
Autonomic instability - haemodynamic and cardiac arrhythmia
Drugs to tube GBS
Carefully titration induction agent
Vasopressin and atropine (Brady/autonomic
AVOID SUX - hyperkalaemia
Treatment of GBS
IvIG
PLex
Equally effective, ivig more expensive but easier
NO ROLE FOR STEROIDS
Other issues for GBS management
Tracheostomy DVT Pressure sores Physio Pain particularly neuropathic Psych VAP bundles
Mortality of GBS
5%
Features of poor outcome in GBS
Elderly
MV
Poor neurology at start and persisting
Prolonged MV
SCoring system for CAP
CURB 65
Confusion (new) Urea > 7 RR >30 BP <90 sys Age over 65
CURB score mortality
0 0.7% 1 3.2% 2 13% 3 17% 4 41.5% 5 57%
First line ABx for CAP
Penicillin plus macrolide
Ben pen/clindamcin
Ix for CAP in immunocomp
Try and get BAL
MC&S
Acid Fast Bacilli (TB)
PCP
Aspergillosis
Galactomannan, beta D glucan (blood), IgG/E assessment
Causes of cavitatinig lung lesions
Bacterial pneumonia - Klebsiella and S.aureus
(PVL producing strains of aureus)
TB
Aspiration
Immunodeficiency - HIV - infective: TB, atypical, mycobacterium, aspergillosis
Non infective: NHL, Kaposi’
Non infective - vasculitis, sarcoidosis, rheumatoid, malig, pulmonary infarct
What is PVL
Extra cellular cytotoxic made by S.aureus
Leuocidal - lytic pores in the cell membrane
Associated with skin/soft tissue infections but can be pneumonia
Treatment of PVL
DoH guidance
Linezolid 600mg 12 hourly
Clindamicin 1.2-1.8g 6 hourly
Consider addition of rifampicin
Consider MRSA cover
Micro involvement
IvIG - toxin continues after bacteria killed
Components of q-sofa score
RR > 22
Altered mental state
BP sys < 100
Helps
Define sepsis
A life threatening organ dysfunction caused by a dysregulated host response to infection
In the sepsis definitions, how is “organ dysfunction” defined
Acute change in total SOFA > 2 points
Define sepsis shock
Subset of sepsis
Underlying circulatory, and cellular/metabolic abnormalities are profound enough to cause mortality
Clinically:
Hypotension requiring vasopressors to maintain MAP >65
AND
Lactate > 2mmol/L
DESPITE volume resus
Variables of the SOFA score
Resp : PF ratio Neuro: GCS GI: bilirubin Renal: Creatinine/Urine Haem: Plts CVS: MAP or vasopressor use
Definition of VAP
Pneumonia occur in patients ventilated for 48 hours / within 48 hours of onset of infection
Diagnosis of VAP
Vented 48 hours
Clinical signs, changes in lab tests, CXR
CPIS scoring or HELICS
CPIS elements
Temperature WCC CXR changes PF ratio Type of secretions
What is a ventilator associated event?
Significant event that can be infective or not, leading to a deterioration in oxygenation
20% increase in daily lowest FiO2
Increase in PEEP of at least 3 cm from stable baseline
Organisms for a VAP
Less than 48 hours in hospital - similar to CAP
More than 5 days - hospital multi-resistant:
Pseudomonas,
Klebsiella
Enterobacter
Acinetobacter
Haemophilia
Gram positives. - s. aureus, streptococcus
Fungi - rare
Preventative measures of VAP
Bundles:
Daily sedation hold 30 degree nursing Chloe hex mouth care Suction (sub glottis) Humidification Maintain cuff pressure 20-30cmH20
?SSD
Stress ulcer prophylaxis
Silver ETT