Core: Cardiology Flashcards
(105 cards)
Patient - Funny sensation in the chest, feeling a little breathless, sudden onset, feeling feint. Returns to normal.
Arrhythmia
Arrhythmia Aetiology
- Cardiac - post MIM IHD, mitral valve disease, cardiomyopathy, pericarditis, myocarditis and aberrant conduction.
- Non-cardiac - Caffeine, smoking, alcohol, sepsis, drugs (BB, digoxin, L-dopa, tricyclics), metabolic (hyper/hypokalaemia, calcium, magnesium), disease (thyroid)
Arrhythmia Pathology
- Odd conduction through the nodes or other areas which create an impulse which is conducted.
eg; HB is a block at the AV node preventing conduction through to the ventricles.
Arrhythmia Presentation
- Palpitations
- Chest pain
- Syncope
- Hypotension
- Pulmonary oedema
- Asymptomatic
Arrhythmia Ix
1) ECG
2) Bloods - electrolytes
3) Sepsis 6
Arrhythmia Rx
Bradycardia only - Tachy covered later on.
1) Identify and remove any causes. Correct electrolyte abnormalities
2) Adenosine can cardiovert even in brady
3) Pacing or an ICD can help prevent arrest and keep the heart beating at a sufficient rate.
Patient - BP >120/80
HTN
HTN aetiology
- Often UK
- Isolated systolic HTN can be due to atherosclerotic changes in vessels
- Essential HTN is often UK and most common cause.
- Secondary HTN - due to renal disease such as glomerulonephritis or atherosclerosis in the renal artery activating RAAS. Endocrine disorders; cushings, CAH, pheochromocytoma, hyperparathryroidism. Pregnancy, OCP, steroids.
HTN - RAAS
Renin - angiotensinogen to angiotensin 1 - ACE (lungs) - Angiotensin 2 (peripheral action and sympathetic NS activation) - Aldosterone (salt and water retention) - HTN
HTN Presentation
- Often nil
- Malignant HTN >200/130 = headaches, visual issues due to retinal haemorrhage and exudates.
HTN Ix
1) BP
2) Ambulatory BP
3) Home BP
4) Cholesterol and Glucose for CV disease risk
5) End organ damage - U&E, ECG (LVH), urinalysis for protein.
HTN Rx
Target = 140/90 <55 and white = 1) ACEI 2) ACEI + CCB or ACEI + thiazide 3) ACEI + CCB + thiazide >55 or black 1) CCB or thiazide 2) ACEI + CCB OR ACEI + thiazide 3) All three - Diabetics - ACEI at any age.
Malignant = atenolol Pregnancy = labetolol or methyldopa
Patient - Central chest pain on exertion only and remises when not exerting.
Stable angina
Angina Aetiology
- Atherosclerotic plaque in coronary artery system.
- Downstream hypoxia when supply and demand for O2 increases.
- Worsens as plaque increases to obscure more of the lumen.
RF = Age, Male, FHx, HTN, High lipids, Smoking, DM.
Other = Prinzmetals angina - coronary artery vasospasm w/o provocation.
Angina Pathology
- Increased Myocardial demand for oxygen on exertion.
- Decreased supply due to narrowed lumen.
- Resolves when demand reduces again.
Angina Presentation
- Central chest pain
- Tight, gripping, heavy
- Can radiate to chest, arm, jaw etc.
- Provoked by; exertion, meals, cold and stress.
- exacerbated by anaemia, hypotension etc.
Canadian CV society 1 = angina w/ strenuous activity 2 = angina on normal activity (stairs) 3 = angina w/ low levels of activity 4 = Angina at rest (unstable - see ACS)
Angina Ix
1) ECG to rule out MI (often can have transient ST depression and T wave inversion)
2) Clinical
3) Coronary angiography to visualise vessels and blockage.
4) Trop at 6 hours post worst pain to rule out NSTEMI.
Angina Rx
1) Reassure, good prognosis
2) Manage co-morbidities; HTN, DM, cholesterol
3) GTN spray for Sx relief.
4) Low-dose aspirin 75-150mg daily
5) BB can reduce Sx (atenolol 50-100mg daily or CCB)
Patient - central crushing chest pain radiating to L arm and jaw, Pain is present at rest. Normal ECG, slightly raised trop.
Unstable Angina
Patient - Central crushing chest pain, radiating to L arm and jaw, present at rest. ST elevation, raised trop.
STEMI
Patient - Central crushing chest pain, radiating to L arm and Jaw. Present at rest. No ST elevation, persistent ST depression and high trop.
NSTEMI
ACS Aetiology
Unstable angina = Angina at rest. No occluding thrombus.
STEMI = Occluding thrombus w/ necrosis of the downstream myocardium w/ ST elevation on ECG
NSTEMI = occluding thrombus w/ necrosis of the downstream myocardium w/o ST elevation ?ST depression
ACS pathology
- Rupture or erosion of a atherosclerotic plaque in a coronary artery.
- Platelet aggregation and adhesions can localised thrombus which can break off causing distant thromboembolism
- Lack of oxygen and blood to downstream myocardium = death and ischaemia.
ACS Presentation
- New onset chest pain
- Pain at rest
- Worsening and development of angina
- N&V
- sweaty
- Pallor
- feeling of impending doom.
- Can be silent in women, DM and elderly.