CVS Drugs Flashcards
Thiazide like diuretics examples
Bendromethiazide
Indapamide
Thiazide like diuretics mechanism of action
Inhibition of sodium chloride co-transporter in the DCT. This is decreases sodium and water reabsorption.
Thiazide like diuretics indications
Hypertension
Heart failure
Thiazide like diuretics ADRs
Hypokalaemia
Arrhythmias
Hyperglycaemia
Hypercholesterolaemia
Thiazide like diuretics drug interactions
NSAIDs
Loop diuretics
Loop diuretics examples
Furosemide
Bumetanide
Loop diuretics mechanism of action
Inhibition of sodium potassium 2chloride co-transporter in the loop of henle
Loop diuretics indications
Oedema
Hypertension
Heart failure
Loop diuretics ADRs
Dizziness
Headache
Electrolyte imbalance
Nausea
Dehydration
Loop diuretics drug interactions
Thiazide like diuretics
Diabetic medication
Potassium sparing drugs examples
Amiloride
Potassium sparing drugs mechansim of action
Blocks ENaC channels at the luminal surface of the renal tubule. This decreases sodium reabsorption without affecting the reabsorption of potassium.
Potassium sparing drugs ADRs
Hyperkalaemia
Potential arrhythmias
Potassium sparing drugs indications
Heart failure
Potassium sparing drugs drug interactions
ACEi
ARBs
Aldosterone receptor antagonist example
Spironolactone
Aldosterone receptor antagonist indications
Oedema
Heart failure
Hypertension
Aldosterone receptor antagonist mechanism of action
competitively inhibits aldosterone dependant Na+ K+ exchange channels in the DCT. This action leads to increased sodium and water excretion, but more potassium retention
Aldosterone receptor antagonist ADRs
Hyperkalaemia
Gynaecomastia
Aldosterone receptor antagonist drug interactions
Drugs that increase potassium levels
Class 1b drugs indications
Ventricular tachycardia
Class 1b ADR
CNS effects : dizziness and drowsiness
GI upset
Class 1b drugs examples
Lidocaine
Mexiletine
Class 1b agents mechanism of action
Decreased depolarisation in ischaemic tissue
Increased sodium threshold
Class 1c drugs examples
Flecainide
Class 1c drugs indications
Supraventricular arrhythmia
Wolff-Parkinson-White syndrome
Class 1c drugs ADR
Pro-arrhythmia
Flecainide flutter
CNS and GI effects
Class 1c agents mechanism of action
Increases refractory period and the action potential
Decreases automaticity
Class 2 drugs examples
Propranolol, bisoprolol and metoprolol
Class 2 drugs indications
Re-entrant arrhythmias
AFIB
Sinus tachycardia
Class 2 drugs ADR
Bronchospasm
Hypotension
Class 3 drugs examples
Amiodarone
Class 3 drugs indications
Wide spectrum - most arrhythmias
Class 3 ADR
Pulmonary fibrosis Hepatic injury Increase LDL cholesterol Thyroid disease Photosensitivity Optic neuritis
Class 3 drugs interactions
Digoxin
Warfarin
Common thromboembolic diseases
DVT PE Consequence of AF TIA MI Ischaemic stroke
How does Prostacyclin - PGI2 - prevent platelet aggregation ?
Prostacyclin is released from endothelial cells which then binds to platelet receptors. This increases the concentration of cAMP in platelets. This causes decreased calcium. This decreases platelet aggregatory events and stabilises inactive GPIIb/IIIa receptors.
What are 3 anti-platelet and fibrinolytic targets ?
The COX-1 enzyme
Fibrinogen acting at the GPIIb/IIIa receptors
ADP and thromboxane 2 upregulating receptors
What class is aspirin ?
Cyclo-oxygenase inhibitor
Indications of aspirin ?
AF post stroke
Secondary prevention of stroke or TIA
MI
Aspirin mechanism of action
Aspirin irreversibly inhibits COX-1 mediated production of thromboxane 2 and reduces platelet aggregation
Aspirin ADR
GI irritation
GI bleeding
Haemorrhage
Aspirin contra-indications
Reye’s syndrome - children having flu or chicken pox while taking aspirin
Hypersensitivity
Pregnancy in 3rd trimester
Aspirin DDI
Other anti-platelets and anti-coagulants
ADP receptor antagonist examples
Clopidogrel
Prasugrel
Ticagrelor
ADP receptor antagonists mechanism of action
Inhibit binding of ADP to P2Y12 receptor which inhibits activation of GPIIb/IIIa receptors.
Differences between Clopidogrel and prasugrel to Ticagrelor
Clopidogrel and Prasugrel are irreversible inhibitors of P2Y12 receptors
Ticagrelor acts reversibly at a different site and has active metabolites
ADP receptor antagonists indications
Ischaemic stroke
TIA
MI + aspirin
Usually used as a second agent in a dual anti platelet therapy
ADP receptor antagonist ADR
Bleeding
GI upset - dyspepsia and diarrhoea
ADP receptor antagonist cautions
High bleed risk patients
Renal and hepatic impairment
ADP receptor antagonist DDI
Clopidogrel requires CYPs for activation so CYP inhibitors such as omeprazole can affect drug efficacy
Dipyridamole drug class
Phosphodiesterase inhibitor
Dipyridamole mechanism of action
Dipyridamole inhibits cellular re-uptake of adenosine. This increases concentration of adenosine which inhibits platelet aggregation via adenosine receptors.
It also prevents cAMP degradation which inhibits expression of GPIIb/IIIa
Dipyridamole indications
Secondary prevention of ischaemic stroke and TIA
Stroke
Dipyridamole ADR
Vomiting
Diarrhoea
Dizziness
Dipyridamole DDI
Anti-platelets
Anti-coagulants
Adenosine
Abciximab drug class
Glycoprotein IIb/IIIa inhibitor
Abciximab mechanism of action
Abciximab prevents the binding of fibrinogen and von Willebrand factor at the GPIIb/IIIa receptors
Abciximab ADR
Bleeding
Abciximab DDI
Anti-platelets
Anti-coagulants
Fibrinolytic agents - clot busters examples
Streptokinase
Alteplase
Fibrinolytic agents - clot busters mechanism of action
Promotes conversion of plasminogen into plasmin. This dissolves the fibrin mesh work of the thrombus.
Fibrinolytic agents - clot busters indications
Acute ischaemic stroke
STEMI
Fibrinolytic agents - clot busters ADR
Bleeding
Fibrinolytic agents - clot busters DDI
Anti-platelets
Anti-coagulants
What is given for secondary prevention of ACS ( STEMI, NSTEMI and unstable angina ) ?
ACEi
Beta blocker
Dual anti platelet therapy - aspirin + ADP receptor antagonist
Statin
Clotting cascade - intrinsic pathway
Factor XII is converted to factor XIIa.
Factor XI is converted to factor XIa by factor XIIa.
Factor IX is converted to factor IXa by factor XIa.
Factor X is then converted into factor Xa by factor IXa.
Prothrombin is then converted into Thrombin by factor Xa.
Thrombin converts fibrinogen into fibrin.
Clotting cascade - extrinsic pathway
Factor VII is converted into factor VIIa by tissue factor.
Factor X is then converted into factor Xa by factor VIIa.
Prothrombin is then converted into thrombin by factor Xa
Thrombin then converts fibrinogen into fibrin.
Unfractionated heparin mechanism of action
Binds to antithrombin III causing a conformational change and increasing activity of ATIII.
This inhibits factor Xa.
Low molecular weight heparin examples
Dalteparin
Enoxaprain
Fondaparinux