Cardio Flashcards
What does an atherosclerotic plaque consist of
Necrotic core
Connective tissue
Fibrous cap
Lipids
Which layer of the vessel does athlersclerotic plaque form
Intimal layer of arteries
Mechanism of clot formation: step 1
Formation of fatty streak. In first 2 decades.
LDL deposited in intimal layer. Gets modified into oxidised LDL.
Causes endothelial damage that secretes chemoattractants. Monocytes and T lymphocytes.
Modified LDL taken up by macrophages that become lipid ladent macrophages.
Fatty streak formed of:
Lipid Ladent macrophage and T lymphocytes
Athlesclerotic clot forming. After fatty streak. Step 2
Formation of intermediate lesions.
Macrophages become foam cells.
Platelet adhere
T lymphocytes and foam cells secrete interferons that causes smooth muscle cells to accumulate.
Foam cells. T lymphocytes. Smooth muscle cells and platelets
Atherosclerotic clot formation step 3
After intermediate lesions
Formation of plaque.
Foam cells die and form necrotic core
Platelets secreting platelets derives growth factors that’s causes smooth muscle proliferation and progresses into fibrous cap
Fibrous cap has collagen- strength- and elastin- flexible
Atherosclerotic clot is constantly growing and reciding. What are the 2 main complications that could cause
1 lumen narrowing- plaque stenosis. Covers 50-75% of coronary=SCAD. Or peripheral vascular disease
2plaque rupture. Atherothrombotic occlusion.
Exposure of basement membrane. Activated massive clotting cascade= infarcts. Either in location or downstream. Causes ACS or stroke
Where are atherosclerotic plaque likely to form
Areas of turbulent flow. Bifurcation. Changes in diameter or thickness
Outcomes of a plaque
Plaque erosion- emboli. Causes infarct. Second most prevalent cause of coronary thromboses
Athlersclerotic aneurysm. Rupture of a AAA
Risk factors for atherosclerotic plaque
Hypertension Diabetes M Obesity Family history Hyperlipidemia Age Smoking
Stable angina pathophysiology
Coronary artery’s are low resistance and microvessles have variable resistance
Atherosclerotic plaque forms
Perfusion dropped.
Dilation of small vessels as much as possible to normalise flow.
During exertion. Required perfusion increases.
Small vessels unable to dilate anymore as they are maximally dilated.
Required flow in normal Q=3m/s. In exertion Q=15m/s
Anginal pain
Anginal chest pain typical qualities
Central crushing chest pain radiating to jaw and arm.
Pain onset by exertion.
Pain improves with rest or GTN
3=typical anginal pain
2=atypical
1= non anginal
What is the rating of anginal pain compared against
CAD risk probability.
Compares score with age to asses likeliness of ACS
Investigation after assessing risk of angina
Low risk. Move onto another differential
Medium risk- stress echo or exercise test.
Very high risk then progress to management of SCAD
Primary prevention of angina/atherosclerosis
Reduce risk factors, Obesity, diet smoking
Statins
Antihypertensives
Better control of diabetes
Secondary prevention of angina
Same as primary prevention plus anti platelets. Aspirin and clopidogrel
First line management of SCAD
Symptomatic -GTN PRN and how to use it
Disease modifying.
B blockers, or CCB.
(These are first line and reduce symptoms)
Antiplatelet
Preventative
Antihypertensives- CCB or ACEi
Information on lifestyle
Statins
What can aggravate angina
Exertion
Large meal
Emotion
Weather
Name B blockers used for angina and ACS and their CI/ SE
Bisoprolol
Atenolol
For anginal
Atenolol
Propranolol
Metopranolol
For post MI
CI- asthma. Prinzmetal angina. COPD. High doses in HF. Bradycardia
SE fatigue. Hypotension, bradycardia, sexual dysfunction
what are CCB
name a few types
method if action
and their uses
Amlodipine
L-Type CCB
smooth muscle dilators (-ve Ionotropic)
These are arterodilaters. Reduced after load and energy needed to produce same CO. Reduces heart workload.
Use in coronary spasm( prinzmetal angina)
Cause odema in legs since they are arterodilaterers. CI in HF
give an example of a Short acting nitrates and its method of action
GTN sublingual
Venodilators
give an example of a long acting nitrates and its method of action
Veno and arterio dilators
Nicorandil
HCN channel slower
Ivabidrine
Surgical management for angina
Pericuteanous coronary intervention.
Indications are poor response to meds. Previous MI
Treatment to include with PCI
Drug illuding stents
Dual antiplatlet
Prinzmetal angina
ECG changes
Cause and treatment
Coronary artery spasm Shows ST elevation as pain occurs and subsided with it Pain occurs at rest CCB Amlodipine Long acting nitrates ivabridine. CI: B blockers and aspirin
ECG of SCAD
Normal or ST Depression plus T Wave inversion
Aspirin and clopidogrel drug class
COX inhibitor and GP2b3A agonist
Type of chest pain associated with ACS and presentation
Central crushing chest pain. Radiating to jaw and arms. Persistent pains. SOB Palpitations Nausea and sweating
Patients presents with suspected ACS
Investigations
12 lead ECG
Cardiac enzymes
Bloods FBC U&E Glucose Lipids
CXR looks for oedema, HF sign, cardiomegaly
Name cardiac enzymes
Troponin
Creatine kinase
Cardiac isoenzyme
Lactate dehydrogenase
Signs of ACS
Distress, anxiety, pallor, sweatiness
Bp HR up or down
4th heart sounds.
Signs of HF( oedema JVP 3rd heart sounds) Pansytolic murmurs (papliary muscle dysfunction)
Complications of ACS on presentation
Syncope, low BP
Oedema
Epigastic pain
Vomiting
Emergency treatment if ACS
MONA Morphine Antiemetic Oxygen if hypoxia Nitrates. GTN Antiplatlets- aspirin 300mg
Results for NSTEMI/UA ECG
Normal
ST Depression
T wave inversion
Both of the above
ACS ECG shows NSTEMI/UA
Troponin=-ve
-ve cardiac enzymes=UA
No permanent damage occurred
No necrosis
ACS NSTEMI/ UA with +ve cardiac enzymes and T wave
Suggests NSTEMI. There could be necrosis
T wave inversion also shows necrosis
ACS without stemi treatment
Dual antiplatelt therapy
Anticoagulation (antithombosis) LMWH or warfarin
Anti ischemia agent (anginal treatment) B blockers (not biseprolol) or CCB + GTN
General management for ACS
Antiplatelet Anticoagulation Bed rest for 48 hours continue B blockers Secondary prevention Antihypertensives Aldosterone antagonist if evidence of HF Statins Better DM Stop smoking Exercise Diet
Assessing risk for ACS NSTEMI/UA
Grace score
Surgical treatment for NSTEMI/UA
Unstable= PCI is CABG
STEMI ECG
And results
T wave peaking pointy St elevation T inversionI Deep Q wave- suggests full thickness infarct Weeks after Q&T wave still show
New LBBB pattern
Troponin and enzymes elevated
Creatine kinase
Management for STEMI
Reperfusion therapy.
If patient presents within 90 minutes of STEMI then PCI
Followed by dual antiplatelet
After 90 mins to 12 hours then fibrolytic therapy. Alteplase/reteplase tpa
Rescue PCI if fibrolytic.
Give them anti coagulation
Post 12 house- dual antiplatlet+ anticoagulation
Complication of MI
Atrial or ventricular arrhythmia LBBB Heart failure occurs in 40% mural thrombi drsslers
Pt presents with signs and symptoms of MI but ECG and chest X-ray are clear. Describe the pain as tearing. What is differential
Suspect Dissection. Use emergency CT. correct in surgery
Stages of hypertension
Stage 1 140/90
Stage 2 160/100
Severe 180/110
Requirement to treat hypertension
If stage 1 plus organ damage
Stage 2 or severe
Diagnosing hypertension
Ambulatory blood pressure monitor if elevated Biochemistry U&E LFT FBC GFR glucose Fundiscope for hypertensive retinopathy HBA1C
Treating hypertension pharmacological
Over 55 or Afro cardibean = CCB
Under 55 anything else = ACEi
ACEi untolerated then ARB
Then B blockers
Then CCB
Then thiazides like diuretics
Treating hypertension conservative
Main 3
Lose weight
Drink less booze (booze BP)
Reduce salt intake
Smoking, reduced stress. Coffee
Hypertension prevalence
One quarter of adults and half of those over 60
Complications of hypertension
Biggest one is stroke
MI Aneurism renal dysfunction heart failure
CI: oral contraception and antidepressants
Medication stopped before surgery
Hypertrophic cardiomyopathy.
inheritance pattern
prevalence
pathophysiology
Autosomal dominant
Prevalence 1 in 500
Mutations cause hypertrophy of ventricles and septum
Causing LVOT obstruction
Signs and symptoms of hypertrophic cardiomyopathy
Asymptomatic. First symptom can be sudden death. 6%
Signs. Crescendo de crescendo early systolic murmur
Syncope
Dyspnoea
Chest pain
Ejection systolic murmur due to LVOT
Jerky carotid pulse
S4 heart sounds due to crack when atria contract
Causes of ejection systolic murmur
Obstruction or stenosis
Pansystolic murmur is a sign of
Mitral regurgitation.
VSD
Pansystolic murmur is a fixed volume sounds that’s occurs between S1 and S2 since as blood is ejection it goes up into across: leaky mitral valve, septum