Cardiology Flashcards
Ductus venosus
Umbilical vein-> IVC
Bypass liver
Foramen ovale
Right atrium-> left atrium
Bypass right ventricle and pulmonary circulation
Ductus arteriosus
Pulmonary artery->aorta
Bypass pulmonary circulation
Features of innocent murmurs
5S
Soft Short Systolic Situation dependent Symptomless
Pan-systolic murmurs DD
Mitral stenosis: 5th intercostal space, mid-clavicular line
Tricuspid regurgitation: 5th intercostal space, left sternal border
VSD: left lower sternal border
Ejection-systolic murmurs
DD
Aortic stenosis: 2nd intercostal space, right sternal border
Pulmonary stenosis: second intercostal space, left sternal border
Hypertrophy obstructive cardiomyopathy: 4th intercostal space, left sternal border
Conditions associated with infective endocarditis
VSD PDA Aortic valve abnormalities Bicuspid aortic valve Tetralogy of fallot
Infective endocarditis triad
Pathophysiology
Endothelial damage, sheer stress forces
Platelet adhesion
Microbial adherence
Bacteraemia
Bacteria protected in vegetation
Infective endocarditis causative organisms
Organisms have surface receptors to fibronectin
S. Aureus
Strep viridans, after dental procedures
Enterococci, after GU or GI surgery
Clinical features of infective endocarditis
Persistent low grade fever Heart murmur Splenomegaly Petechiae Oslers node Jane way lesions Splinter haemorrhages
Embolic phenomena in infective endocarditis
Splinter haemorrhages Glomerular nephritis: haematuria Pulmonary emboli Cerebral emboli: seizures, hemiparesis Roth spots: retinal haemorrhages
Infective endocarditis investigations
Blood cultures, 3 culture over 48-72hours
Echocardiography
Microscopic haematuria
Anaemia, leukocytosis, raised ESR
Modified Dukes criteria for infective endocarditis
Major criteria
Positive blood culture:
2 blood cultures >12hrs apart
3 positive cultures >1 hour apart
ECHO: Mass on valve/ implanted material; Abscess Dehiscence of prosthetic valve New valvular regurgitation
Modified Dukes criteria for infective endocarditis
Minor criteria
Predisposing heart condition or IV drug use
Fever: temperature >38
Vascular phenomena
Immunological phenomena: glomerulonephritis, Roth spots, oslers nodes, rheumatoid factor
Microbiological pneumonia
ECHO
Diagnosis of infective endocarditis
Modified dukes criteria
Two major criteria
5 minor
One major three minor
Complications of infective endocarditis
Systemic embolisation Abscess formation Pseudoaneurysm Valvular perforation Heart failure
Infective endocarditis
IV penicillin or ceftriaxone 4 weeks
Acute rheumatic fever
2-4 weeks after pharyngitis
Strep pyogenes
Epidemiology acute rheumatic fever
Developing countries
Tropical countries
Females
Pathophysiology rheumatic fever
Streptococcus pyogenes
Gram-positive cocci
Cytolytic toxins: streptolysin O and S
M proteins are immunogenic to B cells
Anti-M antibodies affect heart (rheumatic heart disease), brain, joints and skin
Risk factors for rheumatic fever
Children and young people Poverty Overcrowded and poor hygiene places FH of Rh fever D8/17 B cell antigen positivity
Diagnosis of acute rheumatic fever
Positive throat culture for Group A B-haemolytic streptococci
Or Elevated anti-streptolysin O
Or Anti-deoxyribonuclease B titre
And
2 major criteria
1 major and 2 minor
Major criteria (SPECS)
Sydenham chorea Polyarthritis Erythema marginatum Carditis Subcutaneous nodules
Minor criteria (CAPE)
CRP/ ESP- raised acute phase reactant Arthralgia Pyrexia/ fever ECG- prolonged PR interval Joint (arthritis or arthralgia) and cardiac (carditis or prolonged PR interval)
Acute rheumatic fever investigations
Bloods: ESR, CRP, FBC Bloods culture to exclude sepsis Rapid antigen detection test Throat culture Anti-streptococcal serology ECG CXR ECHO
Management of rheumatic fever
Benzathine benzylpenicillin, phenoxymethylpenicillin, amoxicillin
Aspirin or NSAIDs
Emergency valve replacement
In severe carditis: glucocorticoids and diuretics
Secondary prophylaxis with IM benzathine benzylpenicillin every 3-4weeks
Oral phenoxymethylpenicillin twice daily
Oral sulfadiazine daily
Oral azithromycin
ASD
Females more likely to have ostium secundum
Risk factors PDA
Rubella in maternal Prematurity Maternal smoking in 1st trimester Maternal diabetes Maternal drug use
PDA features
Sob Difficulty feeding Poor weight gain LRTI L->r shunt, pulmonary HTN, right heart hypertrohpy, LVH
PDA murmur
Crecendo- decrecendo
Machinery
Continues through second heart sound
Management PDA
Monitor until 1 year
Trans-catheter
Surgical closure
Types of ASD
Patent foramen ovale Ostium secundum defect Ostium primum defect Sinus venosus defect Coronary sinus defect
Syndromes associated with ostium secundum ASD
Treacher-Collins syndrome
Thrombocytopenia- absent radii syndrome
Complications PDA
Stroke, VTE can pass from right heart-> left heart-> brain
Pulmonary HTN, RSHF
AF, atrial flutter
Eisenmenger syndrome
ASD presentation
SOB Difficulty feeding Poor weight gain LRTI Dyspnoea, weight gain, stroke
ASD murmur
Mid-systolic ejection murmur
Crecendo-decrecendo murmur
At upper left sternal border
Fixed split second heart sound: pulmonary valve closes after aortic valve
Diastolic rumble in lower left sternal edge
Management ASD
<5mm spontaneous closure within 12months
Transvenous catheter closure
Open heart surgery via femoral vein
Anticoagulants: aspirin, warfarin, NOACs
VSD genetic association
Down’s syndrome
Turner’s syndrome
Risk factors VSD
Maternal DM Maternal Rubella infection Alcohol maternal Uncontrolled maternal phenylketonuria FH Down’s syndrome Trisomy 18 Trisomy 13 Holt-oram syndrome Teratogens
Presentation VSD
Poor feeding Tachypnoea Failure to thrive Dyspnoea Eisenmenger s cyanosis
Examination VSD
Undernourished Sweat on forehead, LOW CO so increases SNS Increased WoB Cyanosis, blue complexion Clubbing
Murmur VSD
Pan-systolic murmur Left lower sternal border 3rd/4th intercostal space Systolic thrill on palpation S1–>S2
VSD management
Transvenous catheter closure via femoral vein
Open heart surgery
Infective endocarditis prophylaxis
Medical management VSD
Adequate weight gain, NG tube feedings
Diuretics, reduce pulmonary congestion
ACEi
Digoxin
Complications VSD
CHF Growth failure Aortic valve regurgitation Pulmonary vascular disease, Eisenmengers Frequent chest infections Infective endocarditis Arrhythmias Sudden death
Lesions that result in Eisenmenger
ASD
VSD
PDA
Examination findings Eisenmenger syndrome
Right ventricular heave
Loud P2
Raised JVP
Peripheral oedema
Features of Eiesenmenger syndrome
Polycythaemia Plethoric complexion Cyanosis Clubbing Dyspnoea
Csues of death in Eisenmenger syndrome
Heart failure
Infection
Thromboembolism
Haemorrhage
Management
Heart-lung transplant Oxygen Sildenafil for pulmonary HTN Treat arrhythmias Treat polycythaemia with venesection Treat thrombosis with anticoagulants Prevention of infective endocarditis with prophylactic antibiotics
What genetic condition is associated with coarctation of the aorta?
Turners syndrome
Presentation of coarctation of aorta
Weak femoral pulses Tachypnoea Poor feeding Grey and floppy baby Left ventricular heave: LVH Underdeveloped left arm Underdevelopment of legs
Coarctation of aorta
Systolic murmur Left infraclavicular area
Below left scapula
Management of coarctation of aorta
Prostaglandins to keep ductus arteriosus open
Surgery then ligates ductus arteriosus, correct coarctation
Aortic valve stenosis
Fatigue SOB Dizziness Fainting Symptoms worse on exertion
Aortic valve stenosis auscultation
Ejection systolic murmur Second intercostal space, right sternal border Crecendo-decrecendo murmur Radiates to carotid Ejection click before murmur Palpable thrill during systole Slow rising pulse, narrow pulse pressure
Management of aortic valve stenosis
Percutaneous balloon aortic valvoplasty
Surgical aortic valvotomy
Valve replacement
Complications of aortic valve stenosis
Left ventricular outflow tract obstruction Heart failure Ventricular arrhythmia Bacterial endocarditis Sudden death, often on exertion
Conditions associated with pulmonary valve stenosis
Tetralogy of fallot
William syndrome
Noonan syndrome
Congenital rubella syndrome
Presentation of pulmonary valve stenosis
Fatigue on exertion SoB Dizziness Fainting Usually asymptomatic Palpable thrill in pulmonary area Right ventricular heave(RVH) Raised JVP with giant a waves
Pulmonary valve stenosis murmur
Ejection systolic murmur
Left sternal edge
Second intercostal space
Management of pulmonary valve st3nosis
Balloon valvuloplasty
Tetralogy of Fallot
Pulmonary valve stenosis
Overriding aorta
VSD
RVH
Risk factors for ToF
Rubella
Increased maternal age
Alcohol consumption in pregnancy
Diabetic mother
Investigations ToF
Echo, doppler flow study
Boot shaped heart
Signs and symptoms
Tet spells
Cyanosis
Clubbing
Poor feeding and weight gain
Mx of Tet spells
Squat or knees to chest if younger
Oxygen
Beta blockers,relax right ventricle
IV fluids, increase pre-load
Morphine, decrease resp driv,e more efficient breathing
Sodium bicarbonate, buffer metabolic acidosis
Phenylephrine infusion, increase systemic vascular resistance
Management and prognosis of ToF
Prostaglandins infusion in neonates to keep ductus arteriosus open
Total surgical repair by open heart surgery
Epstein’s anomaly
Tricuspid valve lower, poor flow from RA->LUNG
ASD R->L
WPW
Presentation of Epstein’s anomaly
Evidence of heart failure Gallop rhythm Cyanosis SoB and tachypnoea Poor feeding Collaps or cardiac arrest
ECG EBSTEINS ANOMALY
Arrhythmias
Right atrial enlargement
Right bundle branch block
Left axis deviation
CXR ebsteins
Cardiomegaly
Right atrial enlargement