Drug Sheets Flashcards
Fentanyl pharmacology
A synthetic opioid analgesic CNS effects -depression leading to analgesia -respiratory depression -dependence (addiction) Cardiovascular effects -decreases conduction velocity through the AV node
Fentanyl - primary indications
- Sedation the facilitate intubation
- Sedation to maintain intubation
- Analgesia - IV/IN
- history of hypersensitivity
- known renal impairment/failure
- short duration of action desirable
- hypotension
- nausea and/or vomiting
- severe headache
Fentanyl - contraindications
- History of hypersensitivity
2. Late second stage of labour
Fentanyl - precautions
- Elderly/frail pts
- Impaired hepatic functions
- Respiratory depression. Eg COPD
- Current asthma
- Patients on monoamine oxidase inhibitors
- Known addiction to opioids
- Rhinitis, rhinorrhea or facial trauma (IN)
Fentanyl - side effects
- Respiratory depression
- Apnoea
- Rigidity of the diaphragm & intercostal muscles
- Bradycardia
Fentanyl action times
IV Onset: immediate Peak: <5min Duration: 30-60 minutes IN Peak: 2 minutes
GTN pharmacology
Principally a vascular smooth muscle relaxant
Actions:
- venous dilatation promotes venous pooling and reduces venous return to the heart (reduces preload)
- arterial dilatation reduces systemic vascular resistance and arterial pressure (reduces afterload)
The effects of the above are:
- reduced myocardial O2 demand
- reduced systolic, diastolic and mean arterial blood pressure, whilst usually maintaining coronary perfusion pressure
- mild collateral coronary arterial dilatation may improve blood supply to ischaemic areas of myocardium
-mil tachycardia secondary to slight fall in blood pressure
-preterm labour: uterine quiescence in pregnancy
GTN indications
- chest pain with ACS
- acute LVF
- hypertension associated with ACS
- autonomic dysreflexia
- preterm labour (consult)
GTN contraindications
- known hypersensitivity
- systolic BP <110 tablet
- systolic BP <90 patch
- viagra levitra <24 hours, cialis <4days (PDE5 inhibitors)
- heart rate >150
- bradycardia <50 (excluding autonomic dysreflexia)
- VT
- inferior STEMI with BP <160
- Right ventricular MI
GTN precautions
- no previous administration
- elderly patients
- recent MI
- concurrent use with other tocolytics
GTN side effects
tachycardia hypotension headache skin flushing (uncommon) bradycardia (occasionally)
GTN action times
S/L onset: 30 seconds-2 minutes peak: 5-10 minutes duration: 15-30 minutes Patch onset: up to 30 minutes peak: 2 hours
Aspirin pharmacology
An analgesic, antipyretic, anti-inflammatory and antiplatelet aggregation agent
Actions:
- to minimise platelet aggregation and thrombus formation in order to retard the progression of coronary artery thrombosis in ACS
- inhibits the synthesis of prostaglandins - anti-inflammatory actions
Aspirin indications
- ACS
Aspirin contraindications
- hypersensitivity to aspirin/salicylates
- actively bleeding peptic ulcers
- bleeding disorders
4, suspected dissecting aortic aneurysm - chest pain associated with psychostimulant OD if BP >160
Aspirin precautions
- peptic ulcer
- asthma
- patients on anticoagulants
Aspirin side effects
gastrointestinal bleeding, heartburn, nausea
increased bleeding time
hypersensitivity reactions
Aspirin action times
onset: n/a
peak: n/a
duration: 8-10days
Midazolam pharmacology
short acting CNS depressant
- anxiolytic
- sedative
- anticonvulsant
Midazolam indications
- status epilepticus
- sedation to enable intubation (RSI/IFS)
- post intubation sedation
- sedation to enable synchronised cardioversion
- sedation in the agitated patient (mental health act)
- sedation in psychostimulant OD
Midazolam contraindications
- hypersensitivity to benzodiazepines
Midazolam precautions
- reduced doses may be required for the elderly/frail, pts with chronic renal failure, CCF or shock.
- the CNS depressant effects of benzos are enhanced in the presence of narcotics and other tranquilisers including alcohol.
- can cause severe respiratory depression in pts with COPD
- patients with myasthenia gravis
Midazolam side effects
depressed level of consciousness
respiratory depression
loss of airway control
hypotension
Midazolam action times
IM
onset: 3-5 minutes
peak: 15 minutes
duration: 30 minutes
Adrenaline pharmacology
A naturally occurring alpha and beta-adrenergic stimulant
- increases HR by increasing SA node firing rate (beta 1)
- increases conduction velocity through the AV node (beta1)
- increases myocardial contractility (beta 1)
- increases the irritability of the ventricles (beta1)
- causes bronchodilatation (beta 2)
- causes peripheral vasoconstriction (alpha)
Adrenaline indications
- Cardiac arrest-VF/VT, asystole or PEA
- Inadequate perfusion (cardiogenic or non-cardiogenic/non-hypovolaemic)
- Anaphylaxis
- Severe asthma - imminent life threat not responding to nebuliser therapy, or unconscious with no BP
- Croup
Adrenaline Contraindications
- Hypovolaemic shock without adequate fluid replacement
Adrenaline Precautions
- Elderly/frail patients
- Patients with cardiovascular
- Patients on monoamine oxidase inhibitors
- Higher doses may be required for patients on beta blockers
Adrenaline Side effects
Sinus tachycardia Supraventrivular arrhythmias Ventricular arrhythmias Hypertension Pupillary dilatation May increase size of MI Feelings of anxiety and palpitations in the conscious pt
Adrenaline action times
IV
Onset: 30seconds
Peak: 3-5 minutes
Duration: 5-10minutes
IM
onset: 30-90 seconds
Peak: 4-10 minutes
Duration: 5-10 minutes
Ceftriaxone pharmacology
Cephalosporin antibiotic
Ceftriaxone indications
- Suspected meningococcal septicaemia
2. Severe sepsis(consult only)