CARDIOVASCULAR Flashcards
ATRIAL FIBRILLATION
AF vs ECTOPIC BEATS? Management?
ECTOPIC BEATS- spontaneous, b-blocker if treatment needed
AF- can lead to stroke (blood doesn’t fully eject–> clot)
Use ventricular rate control or sinus rhythm control
Treatment- patient with life-threatening haemodynamic instability caused by AF?
Emergency electrical cardioversion without delay to achieve anticoagulation!
Patients without life-threatening haemodynamic instability
Onset of AF <48 hours?
Onset of AF >48 hours?
Onset of AF <48 hours? Rate or Rhythm control
Onset of AF >48 hours? Rate control
2 Types of (Cardioversion) Rhythm Control to restore sinus rhythm?
Pharmacological- flecainide or amiodarone
Electrical- start IV anticoagulation (heparin) and rule out a left atrial thrombus
3 Types of Rate Control Monotherapy?
- beta-blocker (not sotalol)
- Rate-limiting CCB- verapamil/diltiazem
- Digoxin (mainly sedentary patients with non-paroxysmal AF)
Monotherapy to control ventricular rate, an L? Use Rate Control Dual Therapy?
Combine any 2: beta blocker/digoxin/diltiazem
Clinic BP 149/91
Home BP 143/86
Hypertension Stage?
Stage 1
Stroke Prevention, CHA2-DS2-VASC SCORE? C H A2 D S2 V A Sc
When is thromboprophylaxis NOT needed?
C congestive HF Hypertension Age 75+ (2) Diabetic Stroke/TIA (2) Vascular disease- dvt, aneurysm, etc Age 65-74 Sex- female
When is thromboprophylaxis NOT needed?
Men= 0
Women= 1
Thromboprophylaxis: Warfarin OR NOACs in non-valvular AF
ANTI-ARRYTHMIC DRUGS
AMIODARONE? AVOID+SIDE EFFECTS?
BCTPHP
Bradycardia & heart block
Corneal microdeposits (reversible when treatment ends, impaired vision? STOP)
Thyroid disorder (hypo/hyperthyroidism, depends on iodine content)
Photosensitivity (avoid sunlight exposure+sunscreen for months after treatment ends)
Hepatoxicity (clay stools N+V,)
Pulmonary toxicity (SOB, cough)
AMIODARONE INTERACTIONS? LONG TINGGGGGG
HQCB
Digoxin dose?
Very long half life
hypokalaemia- diuretics (loop/thiazide), insulin, laxative
QT prolongation- antihistamines, antidepressants, antibioics
CYP450 enzyme substrate (amiodarone= inhibitor)- grapefruit inhibitor, warfarin/contraceptive/statin
Inducer? Phenytoin, phenobarbital
Bradycardia- b-blocker/R-L CCB
Digoxin dose? HALF
AMIODARONE MONITORING?
TLP-XE
Thyroid test: before treatment+ every 6 months
Liver test: before treatment+ every 6 months
Serum potassium conc: before treatment
Chest x-ray: before treatment
Annual eye examination
IV USE: ECG+liver transaminase
Amiodarone stopped recently, need to start sofosbuvir and daclatasvir, simeprevir and sofosbuvir, or sofosbuvir and ledipasvir? Close monitoring, risk of heart block, fatal!
AMIODARONE LOADING DOSE?
200mg TDS 7 days
200mg BD 7 days
200mg OD maintenance
DIGOXIN? SICK&SLOW!
Therapeutic range?
Toxicity risk? Treatment?
Signs of toxicity?
WHEN DO YOU TAKE BLOOD SAMPLES?
AF loading dose?
Therapeutic range?
0.7-2.0 ng/mL
Toxicity risk?
Increased from 1.5-3.0 ng/mL.
Treated with digoxin-specific antibody
Signs of toxicity? SA/AV block+bradycardia D&V Dizziness/confusion/depression Blurred/yellow vision
WHEN DO YOU TAKE BLOOD SAMPLES? TAKE BLOOD SAMPLES AT LEAST 6HRS POST-DOSE
MONITOR ELECTROLYTES+RENAL FUNCTION
AF loading dose? 125-250mcg OD
DIGOXIN INTERACTIONS?
BTHC
B-BLOCKER- AV block risk
TCAS- arrythmias
Drugs that cause hypokalaemia- risk of toxicity
CYP450 enzyme inducer: reduces plasma conc
CYP450 enzyme inhibitor: increase plasma conc
BLEEDING DISORDERS
TRANEXAMIX ACID?
DESMOPRESSIN?
TRANEXAMIX ACID?
- Surgeries, dental extraction/menorrhagia
- GI side effects: N&V
DESMOPRESSIN?
-Mild-moderate haemophilia +von Willebrand’s disease (difficulty clotting)
THROMBOEMBOLISM
VTE?
DVT?
PE?
Risk factors?
ST(sI)MOPC
VTE? Blood clot in a vein- blocks blood flow
DVT? Legs/pelvis- unilateral localised pain/swelling
PE? Lungs- chest pain/SOB
Risk factors? Surgery Trauma Significant immobility Malignancy Obesity Pregnancy CHC/HRT
D-dimer test for diagnosis
VENOUS THROMBOEBOLISM PROPHYLAXIS
2 METHODS?
MECHANICAL? graduated compression stockings, wear until patient is mobile
PHARMACOLOGICAL? anticoagulants, start within 14hrs of admission
Patients with RF for bleeding (stroke, thrombocytopenia..)- ONLY receive prophylaxis when their risk of VTE outweighs risk of bleeding.
Risk of bleeding tool- ORBIT/HASBLED
VTE PROPHYLAXIS- SURGERY
MECHANICAL?
PHARMACOLOGICAL?
post-surgery?
major cancer?
spinal?
MECHANICAL?
-Continued until mobility/discharge
PHARMACOLOGICAL?
- LWMH common
- Unfractionated heparin preferred in renal impairment
- Fondaparinux, lower limb immob
Continue for at least 7 days post-surgery/till mobility
However,
28 days after major cancer surgery in abdomen
30 days in spinal surgery
VTE PROPHYLAXIS- SURGERY
* ELECTIVE HIP REPLACEMENT?
* ELECTIVE KNEE REPLACEMENT?
ELECTIVE HIP REPLACEMENT?
- LMWH for 10 days AND THEN 75mg aspirin for 28 days
- LMWH for 28 days+stockings till discharge
- Rivaroxaban- 10mg OD, 5 weeks
ELECTIVE KNEE REPLACEMENT?
- 75mg aspirin for 14 days
- LMWH for 14 days+stockings till discharge
- Rivaroxaban- 10mg OD, 2 weeks
General medical patients, high risk of VTE- pharmacological prophylaxis for at least 7 days OR mechanical till mobile
VTE PROPHYLAXIS- PREGNANCY
Risk of VTE?
Birth/miscarriage/termination during past 6 weeks?
Additional mechanical prophy?
Risk of VTE>?
-LMWH, hospital, till no VTE risk/discharge
-Birth/miscarriage/termination during past 6 weeks? start LMWH 4-8hrs after event+continue for 7 days
Additional mechanical prophylaxis? till discharge/mobile
Treatment of VTE: LMWH, unfractionated if patient at high risk of haemorrhage
VTE TREATMENT
Confirmed proximal DVT/PE?
If unsuitable?
Durations of Treatments? Distal DVT? Proximal DVT/PE? Provoked DVT/PE? Unprovoked DVT/PE? Recurrent DVT/PE?
Confirmed proximal DVT/PE?
Apixaban/Rivaroxaban
If unsuitable?
- LMWH for at least 5 days, followed by dabigatran/edoxaban
- LMWH+warfarin for at least 5 days/till INR at least 2, 2 readings, followed by warfarin alone.
Durations of Treatments?
Distal DVT? 6 weeks
Proximal DVT/PE? At least 3 months (3-6m for active cancer)
Provoked DVT/PE? Stop at 3 months if the provoking factor resolved
Unprovoked DVT/PE? 3 months+
Recurrent DVT/PE? Long-term
WARFARIN
- MONITORING INRs, higher INR= runnier blood
VTE/AF/Cardioversion/MI/Cardiomyopathy?
Recurrent VTE/Mechanical heart valves?
WARFARIN ACTIONS
Major bleed?
INR>8, minor bleeding?
INR>8, no bleeding?
INR 5-8, minor bleeding?
INR 5-8, no bleeding?
INR should be monitored every 1-2 days in early treatment and then /12 weeks
VTE/AF/Cardioversion/MI/Cardiomyopathy? 2.5
Recurrent VTE/Mechanical heart valves? 3.5
WARFARIN ACTIONS
Major bleed? Stop warfarin-> IV phytomenadione (vitamin K)+dried protrhombin
INR>8, minor bleeding? Stop warfarin->IV phytomenadiaone
INR>8, no bleeding? Stop warfarin-> oral phytomenadione
INR 5-8, minor bleeding? Stop warfarin-> IV phytomenadione
INR 5-8, no bleeding? Withhold 1-2 doses of warfarin+reduce subsequent dose
Restart warfarin when INR<5
WARFARIN SIDE-EFFECTS?
SKIN NECROSIS+CALCIPHYLAXIS- painful skin rash
HAEMORRHAGE- prolonged bleeding, vitamin K1 (phytomenadione) antidote
PREGNANCY- avoid in 1st and 3rd trimester- use contraception
BLUE TOE SYNDROME!
WARFARIN- INTERACTIONS?
VITAMIN K RICH FOODS- avoid major diet changes, leafy greens, reduces efficacy of warfarin
POMEGRANATE+CRANBERRY JUICE- increases patient INR
MICONAZOLE (OTC Daktarin oral gel)- increases patient INR
CYP450 enzyme inhibitor/inducer- increase/decrease warfarin conc.
CYP inhibitor- fluconazole, macrolides
CYP inducer- phenytoin, carbamazepine, rifampicin
Other antibiotics, kill gut flora that make vitamin K, increases warfarin effect