Clinical Flashcards
What are the types of acyanosis (O2 not compromised)?
- Atrial Septal defect (ASD)
- Ventricular Septal defect
- Coartation aorta
What’s the most common type of cyanosis (02 affected)?
Tetralogy of Fallot:
- Malalignment VSD
- Subvalvular +/- valvular pulmonary stenosis
- Right ventricular hypertrophy (RVH)
- Overriding aorta
True or false: Patent Foramen Ovalis is a type of ASD?
Fasle.
Patent Foramen Ovalis is neither a CHD nor an ASD and usually has no clinical significance. It is problematic when patient has a stroke, when severe desaturation or when scuba diving/space travel.
CLinical presentaiton of Atrial septal defect (ASD)?
- Fixed split S2 on auscultation
- Normal saturation
- JVP
- 2/6 mid-systolic pulmonary flow murmur heard at 2nd LICS
- Seen later in adults with arrhythmias
Types of Atrial Septal Defects (ASD)?
- Secundum (most common, area of foramen ovalis, absent radius bone)
- Primum (associated with endorcardial cushion defect)
- Sinus venosus defect (not a “true” ASD)
Treatment of ASD?
Closure is only necessary if shunt is significant:
- Symptomatic arrhythmias: Palpitations and ¯ exercise tolerance
- Right-sided chamber enlargement
Clinical presentation of Ventricular septal defect?
- Thrill, displaced apex, Harsh, high-frequency holosystolic murmur (3-4/6).
- The smaller the hole the bigger the murmur. Small lesions do not result in volume or pressure overload of the ventricle but big lesions results in LV enlargement and failure
Types of Ventricular Septal defects?
- Infundibular septum
- Membranous septum
- Atrioventricular/Inlet septum
- Trabecular/muscular septum
- OTHER: Eisenmenger Syndrome
What is Eisenmenger Syndrome?
A type of VSD:
Irreversible pulmonary vascular obstructive disease as a result of a LARGE, uncorrected, longstanding acyanotic LàR shunt, can lead to pulmonary atrial hypertension
Treatments of VSD?
The degree of shunting and hemodynamic effect is related to size of VSD and pulmonary and systemic vascular resistance. Surgical closure if not closed by the age of 2 with catheter for some patients.
Clinical presentation of Coartation of aorta?
- Associated with Bicuspid aortic valve (BAV) and Turner’s Syndrome
- The body creates collateral aortic vessels + LVH + high BP in the arms (difference of > 30 mmHg with the legs)
- Bleeding nose
Types of Coartation of aorta?
Narrowing of the aorta usually in the region of the ligamentum arteriosum:
- Post-ductal
- Preductal
Treatment of Coartation of aorta?
Surgery, percutaneous or trans-catheter
Clinical presentation of tetralogy of Fallot?
- Most case sporadic, 15% of cases associated with 22q11 deletion
- NO PHT nor Eisenmendger
- Squating children to compensate (Tet Spells)
- Clubbing
What is called tetralogy of Fallot + Coexistant ASD?
Pentalogy of Fallot
How is normally treated tetralogy of Fallot?
Surgical repair during neonatal period
True or false: Small acyanotic lesions result in volume or pressure overload of the ventricle
NON. Just the big ones.
What are the types of Genetic disorders affecting the structure of the heart – presenting as malformations?
- Trisomy 21
- Syndrome of 22q11 deletion
What’s the management of heart disease in trisomy 21?
- 40% have congenital cardiac malformation (atrial and ventricular septal defects, common atrioventricular canal, patent ductus arteriousus).
- Management and counselling include specific guidelines for evaluation and follow-up
What’s the treatment of heart diseases in Syndrome of 22q11 deletion?
- 75% have heart malformations; also have , parthyroid hypoplasia, thymus hypoplasia, and
- We do a chromosome microarray and there are specific guidelines for evaluation and follow-up
What are the types of genetic disorders affecting the muscle of the heart – presenting as cardiomyopathy?
- Mitochondrial DNA disorder
- Fabry Disease (metabolic cardiomyopathy)
- Noonan Syndrome
What’s the management of heart diseases in mitochondrial DNA disorder?
- Cause: (1) heteroplasmy (80-09% are mutant DNA, same muration) (2) mitotic segregation (pleiotropy, different mutations) (3) maternal inheritance
- Can affect at any age, any organ, any symptoms, and any inheritance
- We investigate with general biochemical work-up; evaluate the organs involved, specific mitochondrial evaluation (biopsy) and molecular tests (nuclear DNA). Management include specific follow-up, symptomatic treatment, specific vitamins and medication
What is the management of heart diseases in Fabry disease?
- Males more affected than female (X linked), Heart murmur, angiokeratoma, and corneal opacities
- Evaluation include cardiology, nephrology, neurology, ophthalmology
- Due to lysosomal storage disorder
- Management include enzyme therapy and specific surveillance
What is the management of heart disease in Noonan Syndrome?
- 50-80% have cardiac defect; also have dysmorphic features, short stature, hearing and vision problems
- Due to a genetic defect-RAS-opathy, locus heterogeneity, the genetic cause of this cardiomyopathy is diverse (could be neuromuscular). They can be classified as dilatatice CM, hypertrophic CM and arrhythmogenic right ventricle dysplasia
- Evaluation: (1) Clinical cardiovascular features (2) Detailed medical history (3) Cumulative phenotype information WE DON’T ALWAYS TEST FOR GENETIC BECAUSE NOT ALWAYS CONCLUSIVE
Name a Genetic disorders affecting the vascular system.
Marfan’s syndrome
What is the management of Marfan’s syndrome?
- Autosomal dominant, manifectations include long thin arms and legs, asymmetric chest and scoliosis, arachnodactyly, dilatation/dissection of the ascending aorta, or descending thoracic or abdominal aorta
- Evaluations: Ophthalmology, Cardiology, Respirology and gene testing for
- Management and follow-up include guidelines, avoidance of contact sport and cardiac stimulant (coffee) and cascade testing for family
What mechanisms can cause heart malformation?
- Abnormal # of chromosome
- Mocrodeletion/duplication
- Single gene mutation
- Storage Lysosomal
What mechanisms can cause Hypertrophic cardiomyopathy?
- Mocrodeletion/duplication
- Single gene mutation
- Energy dysfunction (mitochondrial)
- Storage Lysosomal
What mechanisms can cause vascular disease?
- Mocrodeletion/duplication
- Single gene mutation
- Energy dysfunction (mitochondrial)
- Storage Lysosonal
What is ischemia?
An imbalance between myocardial O2 supply and demand
How does ischemia manifests?
It manifest in different ways:
- Angina Pectoris (pain in the chest)
- Stable Angina: fixed obstruction CAD (>70%), with exertion HR, BP, contractility and myocardial O2 demand ↑
- Unstable Angina: sudden ↑ in tempo and duration of the ischemic episode, precursor to acute MI
- Variant Angina: at rest, caused by coronary vasospasm, ST-Elevation, endothelial/sympathetic activity problems
- Silent ischemia
Common in diabetic, woman and elderly - Myocardial Infarction (MI)
How do patients describe their symptoms when they have angina?
- “Pressure, elephant sitting on chest, discomfort or burning” NOT “stabbing, sharp, pleuritic (increases with inspiration) or worst with palpation”
- Usually diffuse, radiates to chest, shoulder, neck, lower face and back
- Associated with dyspnea, fatigue, weakness, SNS or PNS (nausea, tachycardia, sweats)
- Precipitated by anything ↑ myocardial O2 demand (activity, large meal, cold, emotions)
What are the 2 principal ways to dx angina?
- ECG (transient ischemia: ST depression and Y wave flat or inversion)
- Stress Testing (EST): exercise on a treadmill and they are CLINICALLY (pain) and/or ELECTRIALLY positive (1 mm ST depression)
Treatment of CAD?
- Nitrates
Oral, patches
Drug tolerance: we need a nitro-free interval for several hours (resets receptors)
They don’t save life, they make patients feel better
Side effects: headache, lightheadedness, and palpitations - Beta-adrenergic blockers
First line chronic therapy
↓ MVO2 (↓ contractility and HR)
Contraindication with asthma (bronchospasm) and decompensated LV failure
Side effects: fatigue and erectile dysfunction - Calcium channel blockers
Potent vasodilators:
↓ MVO2
↑ myocardial O2 supply
Preventing complications of CAD?
- Antiplatelet therapy
- Aspirin (all patients for life)
- Clopidogrel
- Lipid-lowering therapy
- Statins: lower MI and death rates in patients with established CAD
- ACE-I and ARBs
Reduce rates of death, MI, and CVA in patients with CAD
What are the indications for revascularization therapy?
When to consider
- Symptoms of angina do not respond adequately to anti-anginal drug therapy
- Unacceptable side-effects of medications
- Non-invasive testing suggests high risk CAD for which revascularization is expected to improve survival
Techniques
- Percutaneous Coronary Intervention (PCI) STENTS
Need anti-proliferative medication (prevents scaring down)
- Coronary Artery Bypass Graft (CABG) surgery (better for diabetics)
- Veins: saphenous vein, vulnerable to accelerated atherosclerosis
- Arteries (IMA): internal mammary artery, better (used for the LAD)
Features of unstable angina?
Symptoms:
Crescendo, rest, new onset severe angina, no response to nitro
Myocardial Biomarkers:
None
ECG:
ST depression and or T-wave inversion
Features of NSTEMI?
Symptoms:
Prolonged crushing chest pain, wider radiation, more severe
Myocardial Biomarkers:
Troponin I and T, starts after 3-4 hours, Peak 18-36 hours, can be seen for 10 days ish
ECG:
ST depression and or T-wave inversion
Feartures of STEMI?
Symptoms:
Prolonged crushing chest pain, wider radiation, more severe
Myocardial Biomarkers:
Troponin I and T, starts after 3-4 hours, Peak 18-36 hours, can be seen for 10 days ish
ECG:
ST elevation and Q wave later
Treatment of unstable angina and NSTEMI MI?
FIRST:
- Admission to an intensive care setting: continuous ECG monitoring for arrhythmias
- Bed rest to minimize myocardial oxygen demand
- Supplemental oxygen if hypoxemia to improve oxygen supply
- Analgesics (e.g. morphine) to reduce chest pain and anxiety
THEN:
- Anti-ischemic:
- Nitrates: venodilation, vasodilation, IV, are helpful with heart failure and hypertension
- Calcium channel blockers: used when contraindication of beta-blockers, should NOT be prescribed to patients with severe LV dysfunction
- Beta-blockers: ↓ sympathetic drive, ↓ MVO2, ↓ mortality
venodilation, vasodilation, intravenous, CCB
- Anti-thrombotic therapy to prevent further growth and facilitating resolution of the partially occlusive thrombus
- Antiplatelet (aspirin + P2Y12 antagonist such as clopidogrel, prasugrel or ticagrelor + Glycoprotein (GP) IIb/IIIa receptor antagonists)
- Anticoagulant (unfractionated heparin, LMWHs)
We start with conservative treatment and then we do invasive (angiogram) decided by TIMI score ≥3
Treatment of STEMI?
FIRST:
- Admission to an intensive care setting: continuous ECG monitoring for arrhythmias
- Bed rest to minimize myocardial oxygen demand
- Supplemental oxygen if hypoxemia to improve oxygen supply
- Analgesics (e.g. morphine) to reduce chest pain and anxiety
THEN:
- Fibrinolytic drugs (NSTEMI and U/A patients DO NOT BENEFIT from fibrinolytic therapy) 2 first hours, not if bleeding
- Percutaneous coronary mechanical revascularization (best option if 90 minutes) + dual antiplatelet therapy (aspirin + P2Y12 antagonist)
- Aspirin, Heparin, Beta-blockers, Nitrates
+ Adjunctive therapies
- ACE inhibitors
- Cholesterol-lowering statins
What are the elements of the TIMI score?
- Age > 65
- > 3 CAD risk factors
- Prior stenosis > 50%
- ST deviation
- > 2 anginal events in < 24 h
- ASA in last 7 days
- Elevated cardiac markers
What’s the post-discharge therapy after an MI?
- Aspirin + Second antiplatelet drug (clopidogrel/ticagrelor/prasugrel)
- Beta-blocker
- HMG-CoA reductase inhibitor (statin)
- ACE-inhibitors (or ARBs if intolerant)
- Nitroglycerine puffer (to be used as needed for angina)
- Risk factor modification