Emergency - Level 1 Flashcards
Definition of anaphylactic shock?
- Anaphylaxis is generalised immunological condition of sudden onset, which develops after exposure to foreign substance
Mechanism of anaphylactic shock?
o Type 1 IgE mediated reaction which patient has been previously exposed
o Complement mediated
o Unknown
Pathology of anaphylactic shock?
o Mast cells and basophils release histamine, prostaglandins, leukotrienes, platelet activating factors
Causes of anaphylactic shock?
o Drugs and vaccines (Abx, penicillin, streptokinase, aspirin, suxamethonium, NSAIDs, IV contrast)
o Bee/Wasp sting
o Food (nuts, shellfish, strawberries, wheat)
o Latex
o Semen
Symptoms of anaphylactic shock - respiratory, skin, CV and GI?
Onset usually minutes/houra, prodrome of feeling impending doom may present
o Swelling of lips, tongue, pharynx and epiglottis – airway obstruction
o Dyspnoea, wheeze, chest tightness, hypoxia, hypercapnia
o Pruritus, erythema, urticaria, angio-oedema
o Vasodilation, increased vascular permeability – hypotension and shock
o Arrhythmias, ischaemic chest pain
o Nausea, vomiting, diarrhoea, abdominal cramps
ALS algorithm management for anaphylaxis - 1 - diagnosis?
o Acute onset
o Life-threatening ABC problems
Airway: swelling, hoarseness, stridor
Breathing: rapid breathing, wheeze, fatigue, cyanosis, SpO2 < 92%, confusion
Circulation: pale, clammy, low blood pressure, faintness, drowsy/coma
o Usually skin changes
ALS algorithm management for anaphylaxis - 2 - ABCDE?
o Call for help
o Lie patient flat
o Raise patient’s legs
ALS algorithm management for anaphylaxis - 3 - 1st drug and dose?
- Adrenaline
o IM 1:1000 adrenaline (repeat after 5 mins if no better)
Adults or child >12 years - 500mcg IM (0.5ml)
Child 6-12 years – 300mcg (0.3ml)
Child <6 years – 150mcg (0.15ml)
o IV given by experienced specialists
Titrate adults 50mcg, children 1mcg/kg
ALS algorithm management for anaphylaxis - 4 - when available?
o Establish airway
o High flow oxygen
ALS algorithm management for anaphylaxis - 5 - 3 other drug management?
o IV fluid challenge o Chlorphenamine (IM or slow IV) o Hydrocortisone (IM or slow IV)
Doses of IV fluids in anaphylaxis?
o IV fluid challenge
500-1000ml - 0.9% saline bolus
Child 20ml/kg – 0.9% saline bolus
Doses of chlorphenamine in anaphylaxis?
o Chlorphenamine (IM or slow IV) Adult or child > 12 years - 10 mg Child 6 - 12 years 5 mg Child 6 months to 6 years 2.5 mg Child less than 6 months 250 micrograms/kg
Doses of hydrocortisone in anaphylaxis?
o Hydrocortisone (IM or slow IV) Adult or child > 12 years - 200 mg Child 6 - 12 years - 100 mg Child 6 months to 6 years - 50 mg Child less than 6 months - 25 mg
Monitoring in anaphylaxis?
o Pulse oximetry
o ECG
o BP
Further management in anaphylaxis?
o ICU – adrenaline, aminophylline and nebulised salbutamol may be needed
Management after emergency treatment of anaphylaxis?
Document time of reaction and triggers identified in notes
Mast Cell Tryptase ASAP & 2nd sample within 1-2 hours from onset of symptoms
Admission for children <16, observe adults for 6-12 hours
Refer to specialist allergy service
Adrenaline injector as interim measure, teach how to use it
Diagnostic, monitoring and management
Definition of SIRS?
o SIRS = 2 or more of:
Temperature >38 or <36
Tachycardia >90bpm
RR >20 or PaCO2 <4.3kPa
WBC >12x109/L or <4x109/L
Definition of sepsis?
SIRS in presence of infection
Definition of severe sepsis?
Sepsis with organ hypoperfusion or altered cerebral function
Definition of septic shock?
Severe sepsis with hypotension (<90 SBP or MAP <65) despite adequate fluid resuscitation or requiring vasopressors
Pathology of sepsis?
- Infection with any organism causes acute vasodilation from inflammatory cytokines
- Increased risk in very young and older people, immunodeficient, long-term steroids, surgery within 6 weeks, indwelling catheters, pregnancy
Symptoms of sepsis?
o Warm, vasodilated (can be cold to touch) o Fever o Tachycardic o Tachypnoea o High WCC o Hypotension
Assessment of sepsis?
o Temperature, HR, RR, BP, level of consciousness and O2 sats
o CRT in children
Risk assessment of sepsis - moderate-to-high risk?
New-onset behaviour change Impaired immune system Trauma/surgery/invasive procedure in past 6 weeks RR 21-24 HR 91-130 or new-onset arrhythmia BP 91-100 Not passed urine for 12-18 hours Temperature <36
Risk assessment of sepsis - high risk?
New altered mental state RR >25 New need for 40% O2 to maintain O2 sats >92% HR >130 BP <90 or <40 below normal Not passed urine in previous 18 hours Mottled or ashen Cyanosis of lips or tongue Non-blanching skin rash
What is sepsis 6 bundle?
o Bloods & cultures o Urine output o Fluids o Abx o Lactate o Oxygen o ABG
Initial management of sepsis?
o Get senior help
o Oxygen 15L/min - Targets 94-98% or 88-92%
o ABG if indicated
o IV access & Bloods – FBC, U&Es, CRP, clotting, glucose, VBG, 2 or more blood cultures
o Fluids IV 0.9% saline 500ml bolus (20ml/kg) - If no improvement, give second bolus
o Catheterise patient – measure urine output
o Antibiotics within 1 hour
Adults - Tazocin 4.5g TDS <3 days then focus
If child <17 – give IV ceftriaxone 80mg/kg OD
If meningococcal disease: IM benzylpenicillin in community, IV ceftriaxone in hospital
What investigations to perform in sepsis to look for cause?
Do blood & urine cultures, sputum cultures, CSF if suspected source of infection
Consider urinalysis and CXR in all people
Consider abdomen and pelvis CT if no source identified
CI of lumbar puncture in sepsis?
- GCS<9 or drop of 3 points or more
- Relative bradycardia and hypertension
- Focal neurological signs
- Abnormal posture
- Unequal or poorly responsive pupils
- Papilloedema
- Shock
- Extensive purpura
- Platelets <100x109/L or anticoagulation
- Local infection at lumber puncture site
When to perform lumbar puncture in sepsis?
• Infant <1 month, aged 1-3 months and unwell, aged 1-3 months with WCC <5x109/litre or >15
Monitoring in sepsis?
o Monitoring continuously or every 30 minutes if high/moderate risk
o Repeat BP and ABG after fluid challenge
Management after repeating BP and ABG after fluid challenge?
Alert consultant if after 1 hour of Abx and fluids:
• Systolic BP <90
• Reduced consciousness
• RR>25
• Lactate not reduced by >20% within 1 hour
If SPB<90 or lactate >4 then refer to critical care for central venous access and inotrope and vasopressors
What should be completed within 1 hours in surviving sepsis campaign?
Lactate levels
Blood Cultures
Administer Abx
Administer crystalloid fluids for hypotension or high lactate
What should be completed within 6 hours in surviving sepsis campaign?
Vasopressors (for unresponsive hypotension) to maintain MAP >65mmHg
• Noradrenaline +/- adrenaline
Measure CVP, central venous saturation and lactate if elevated
Definition of cardiogenic shock?
- Failure of pump action of heart, resulting in decrease in cardiac output causing reduced end-organ perfusion
- Leads to acute hypoperfusion and hypoxia of tissues/organs, despite adequate intravascular volume
- Defined as:
o Sustained hypoperfusion SBP<90 for >30 minutes
o Tissue hypoperfusion (cold peripheries, oliguria <30ml/h or both)
Causes of cardiogenic shock - cardiac?
Myocardial Infarction (anterior wall) Arrhythmias Acute mitral regurgitation (due to ruptured papillary muscle/chordae tendinae) VSD HOCM Myocarditis Valve disease – AS, IE Aortic dissection