Medicines Flashcards
Adenosine dose
6mg IV followed by second dose 12mg IV if SVT does not revert
Adenosine indication
Patients older than 12 with SVT and ventricular rate greater than 150,
and known responsiveness to adenosine
and causing moderate cardiovascular compromise
Adenosine contraindications
Known severe allergy
Known sick sinus syndrome
History of second or third degree heart block without pacemaker
Heart transplant without pacemaker
Adenosine caution
Asthma or COPD acute exacerbation and/or history of life threatening bronchospasm
Wolf Parkinson White if any chance of rapid atrial fibrillation
Adenosine administration
6mg in 2ml, given neat into ACF followed by rapid flush.
Adenosine adverse effects
Bradycardia and/or sinus pause up to 30 seconds
Shortness of breath or urge to breathe deeply
Lightheadedness
Nausea, flushing
Chest pressure or severe apprehension
Adenosine pharmokinetics
Rapidly taken up and metabolised within seconds by red blood cells and vascular endothelial cells
Adenosine onset of effect
5 to 10 seconds
Adenosine duration of effect
10-20 seconds.
Adrenaline mechanism of action
Stimulates alpha and beta receptors, primarily alpha 1, beta 1, and beta 2 receptors.
alpha 1 stimulation causes smooth muscle contraction, vasoconstriction, stimulation of glycogenolysis and gluconeogenesis
beta 1 causes increase in inotropy, chronotropy, and dromotropy
beta 2 causes smooth muscle relaxation, skeletal muscle vasodilation, bronchodilation, and stabilisation of mast cell membranes to reduce histamine release
Adrenaline indication
Cardiac arrest Anaphylaxis Severe asthma Imminent respiratory arrest in COPD Severe bradycardia Moderate to severe stridor IN for epistaxis topical for wounds shock where unresponsive to metaraminol
Adrenaline contraindications
None
Adrenaline cautions
Myocardial ischaemia
Tachydysrhythmia
Adrenaline dose
Topical 1:10000 diluted to total of 10ml.
Intranasal 1:10000 diluted to a total of 10ml, with 0.2mg or 2ml through a MAD
Nebuliser, 5mg undiluted
IM neat (0.5mg for asthma repeated q10 minutes, q10 for not improving anaphylaxis, q5 minutes for deteriorating anaphylaxis)
IV undiluted for cardiac arrest
Adrenaline adverse effects
Tachycardia Tachydysrhythmia Myocardial Ischaemia Ventricular ectopy Hypertension Nausea and vomiting Tremor, anxiety, sweating Hyperglycaemia
Adrenaline onset IV
5-10 seconds
Adrenaline onset IM
2-5 minutes
Adrenaline onset topical and intranasal
on contact
Adrenaline pharmacokinetics
Adrenaline is metabolised by the liver and taken up by sympathetic nerve endings. There are no significant effects from liver impairment on acute administration.
Amiodarone mechanism
An antidysrthymic with broad spectrum of activity.
Predominately class three activity (it prolongs the action potential duration, reduces automaticity and prolongs refractory period of atrial, nodal and ventricular tissues)
… resulting in reduction of abnormal electrical activity, a reduction in electrical conduction, reduction in heart rate, and stabilisation of SA and AV nodes.
Small increase in coronary blood flow & reduction in myocardial oxygen consumption by reducing inotropy.
Amiodarone indications
Cardiac arrest in VT or VF after first dose of adrenaline
adults in sustained VT
Adults with moderate cardiovascular compromise as result of fast AFib or fast AFlutter
Amiodarone contraindications
Known severe allergy
Known severe allergy to iodine
VT secondary to TCA poisoning (can cause worsening shock).
Amiodarone cautions
None in cardiac arrest
Amiodarone dosage
300mg for adult… (2x 150mg in 2ml vial)
If VT or VF persists, a second dose of 150mg May be administered.
Amiodarone administration
Neat IV bolus of 300mg in 4ml, two vials
Amiodarone adverse effects
Hypotension
Lightheadedness
Bradydysrhysmia
Amiodarone onset
5-10 minutes
Amiodarone duration
1-4 hours after single dose.
Amiodarone pharmacokinetics
Metabolised by liver.
Amoxiclav mechanism
Is a beta-lactate antibiotic with broad activity against gram negative and gram positive bacteria. Also has some activity against anaerobic bacteria, particularly those from the mouth.
Inhibits production of the bacterial cell wall causing bacteria to die.
Amoxiclav indications
Sepsis and:
Patient is aged greater than 12
One or more High Risk factors are present
Time to hospital greater than 30 minutes
Cellulitis where single IV dose may be given if referred to primary care but delay may be present.
Amoxiclav contradindications
Known severe allergy
Known severe allergy penicillins or cephalosporins
Amoxiclav cautions
None! Free square.
Amoxiclav dose
1.2g
Amoxiclav administration
Dissolve 1.2g in nacl and dilute to 10ml. administer IV over 1-2 minutes preferably into running IV line
Do not administer IM if IV access cannot be obtained.
Amoxiclav onset
30-60 minutes
Amoxiclav duration
6-8 hours
Amoxiclav Pharmacokinetics
Excreted in urine - clearance prolonged in renal impairment, does not alter dose.
Aspirin mechanism
Has antiplatelet, antipyretic, anti-inflammatory and analgesic effects but only given for antiplatelet effect
Inhibits cyclooxygenase which results in reduction of formation of thromboxane and prostaglandins
Aspirin indications
Myocardial ischaemia
Aspirin contraindications
Known severe allergy
Third trimester of pregnancy
Aspirin caution
Known bleeding disorder (usually in favour of administration)
Clinically significant bleeding
Known worsening bronchospasm with NSAIDs
Aspirin dose
300mg in 1 tablet
Aspirin admin
One 300mg tablet sublingual or dispersed in water.
Aspirin common adverse effects
Increased bleeding
Indigestion and gastric bleeding only risk with prolonged use
Aspirin onset
30-60 minutes
Aspirin duration
3-5 days for antiplatelet activity
Aspirin pharmacokinetics
Absorbed in stomach, metabolised in liver
Aspirin interactions
Warfarin
Ceftriaxone mechanism
Cephalosporin antibiotic with broad activity against gram negative and positive bacteria. inhibits production of the bacterial cell wall.
Ceftriaxone indications
Suspected meningococcal septicaemia
Ceftriaxone contraindications
Anaphylaxis to cephalosporins
Ceftriaxone cautions
None. Free square.
Ceftriaxone dose
2g IV
2g IM if IV access cannot be obtained
Ceftriaxone administration
Reconstitute 2g and dilute to 10ml, administer IV over 1-2 minutes preferably into a running line.
Reconstitute 2g with 4ml nacl and split into roughly equal doses for IM administration
Ceftriaxone adverse effects
None
Ceftriaxone onset
30-60 minutes
Ceftriaxone duration
24 hours
Ceftriaxone pharmacokinetics
Excreted in urine and bile
Clopidogrel mechanism
Powerful antiplatelet agent, blocks ADP.
Clopidogrel indications
STEMI thrombolysis.
Clopidogrel contraindications
Known severe allergy
Clopidogrel cautions
Clinically significant bleeding
At risk of bleeding
Pregnancy
Clopidogrel dose
300mg if less than 75 years
75mg if greater than 75 years
Tablet
Clopidogrel adverse effects
Increased bleeding
Clopidogrel onset
30-60 minutes
Clopidogrel pharmacokinetics
prodrug, must be metabolised in the liver into active form.
Droperidol mechanism of action
Blocks dopamine and alpha receptors centrally, resulting in sedation, reduced agitation, and mental detachment.
Droperidol indications
Patients aged greater than or equal to 12 years with agitated delirium causing a mild to moderate risk to safety when olanzapone has not been administered or is ineffective.
Droperidol contraindications
Known severe allergy
Droperidol cautions
Parkinson’s disease - risk of worsening movement disorder.
Concurrent administration of other sedatives - this will increase and prolong effects.
Intoxication - potentiates
Elderly or frail - increase/prolong effects
Droperidol dosage
10mg IM or IV, reduce to 5 if patient is frail, repeat once after 20 minutes.
Droperidol administration
IM neat, lateral thigh
Dilute 10mg to 10ml and administer IV over 1-2 minutes.
Enoxaparin mechanism
Low molecular weight heparin anticoagulant, potentiating activity of antithrombin III causing inhibition of multiple coagulation factors
Enoxaparin indication
STEMI thrombolysis
Enoxaparin contraindications
Known severe allergy
Enoxaparin cautions
Clinically significant bleeding
Risk of bleeding
Pregnancy
Enoxaparin dose
Weight and age based. 60-100mg for those under 75 and 44-75 for those over 75.
Enoxaparin administration
subcut into abdominal wall
Enoxaparin onset
10-30 minutes
Enoxaparin duration
12-24 hours
Enoxaparin pharmacokinetics
Excreted in urine.
Fentanyl mechanism of action
Opiate analgesic.
Fentanyl indications
Moderate to severe pain Cardiogenic pulmonary oedema with severe anxiety RSI Sedation post intubation Symptom control at end of life care
Fentanyl contraindications
Known severe allergy
Unable to obey commands (other than rsi, end of life care, post intubation)
Respiratory depression
Fentanyl cautions
Aged less than one year
High risk of respiratory depression (severe copd, home bipap)
Labour
Concurrent administration of other opiates or cns depressants
Elderly or frail
Signs of shock.
Fentanyl dose
IV analgesia - 10-50mcg every five minutes for an adult.
IN analgesia 100mcg for adult, further doses 50mcg every ten minutes without maximum dose. 200 + 100 adult over 80kg.
IM 50-100mcg for an adult.
Fentanyl adverse effects
Respiratory depression Bradycardia Hypotension Sedation Nausea and vomiting Itch Euphoria
Fentanyl onset
IV 2-5 minutes, maximum in 10-15.
IN 5-10 minutes.
IM 5-10 minutes
Fentanyl duration
30-60 minutes although respiratory depression may last hours.
Fentanyl pharmacokinetics
Fat soluble, well absorbed through nasal mucosa.
Causes histamine release. Small fall in blood pressure.
Metabolised in liver.
Gentamicin mechanism of action
Aminoglycoside antibiotic with broad activity against gram-negative bacteria. inhibits cell protein synthesis.
Gentamicin indications
Sepsis, in addition to amoxicillin/clavulanic acid) where site of infection is urinary tract, abdomen, or unknown and:
Patient aged 12+
One or more high risk factors
Time to hospital is greater than 30 minutes
Gentamicin contraindications
Known severe allergy
Pregnancy
Gentamicin cautions
Empty square player choice
Gentamicin dosage
400mg if greater than 80kg
320 if 60-80kg
240 if less than 60kg
Gentamicin administration
Dilute dose up to 10-20ml of saline and give IV over 1-2 minutes preferably into a running IV line
Gentamicin adverse effects
Damage to inner ear with prolonged use
Rental impairment with prolonged use
Gentamicin onset of effect
30-60 minutes
Gentamicin duration
24 hours
Gentamicin pharmacokinetics
Excreted in urine.
Gentamicin interactions
May potentiate effects of neuromuscular blockers, resulting in longer duration of action for these drugs
Glucagon mechanism
Increases blood glucose level by stimulating glucogenolysis, predominately within the liver.