Cardiac Pathology Flashcards
How does the adult form of coarctation of the aorta present?
Hypertension in the upper extremities and hypotension with weak pulses in the lower extremities
Hypertrophic cardiomyopathy
Massive hypertrophy of the left ventricle
Acute Rheumatic fever minor criteria
Fever and elevated ESR
Cause of roth spots
Due to embolization of septic vegetations
How does myocarditis present in cases of acute rheumatic fever?
Myocarditis with Aschoff bodies that are characterized by foci of chronic inflammation, reactive histiocytes with slender, wavy nuclei (Anitschkow cells), giant cells, and fibronoid material
_____________ is chest pain that arises with exertion or emotional stress.
Stable angina
Patent ductus arteriosus is associated with congenital _____________.
Rubella
Necrosis of cardiac myocytes
MI
Benign mesenchymal tumor with a gelatinous appearance and abundant ground substance on histology
Myxoma
Complications of aortic stenosis
- Concentric left ventricular hypertrophy
- Angina and syncope with excercise
- Microangiopathic hemolytic anemia
Causes of aortic regurgitation
Aortic root dilation
Valve damage
Clinical features of left-sided heart are due to..
Decreased forward perfusion and pulmonary congestion
Major complication of atrial septal defects
Paradoxical emboli
Which organisms are associated with endocarditis with negative blood cultures?
Haemophilus
Actinobacillus
Cardiobacterium
Eikenella
Kingella
Most common arteries infarcted in MI
LAD (1st)
Right coronary
Left circumflex
Cause of acute rheumatic fever
Molecular mimicry; bacterial M protein resembles proteins in human
What is the cause of syncope with excercise seen with in hypertrophic cardiomyopathy?
Subaortic hypetrophy of the ventricular septum results in function aortic stenosis
Jones criteria
- Evidence of prior group A strep infection
- Elevated ASO or anti-DNase B titers
- Presence of major and minor criteria
how is aortic stenosis treated?
Valve replacement after onset of complications
How is MI treated?
- Aspirin and/or heparin
- Supplement O2
- Nitrates
- B-blockers
- ACE inhibitor
- Fibrinolysis of angioplasty
- Opens blocked vessel
Cause of MI
- Rupture of an atherosclerotic plaque with thrombosis and complete occlusion of a coronary artery (most common)
- Coronary artery vasospasm
- Emobli
- Vasculitis
What is the most common etiology of sudden cardiac death?
Acute ischemia
*90% of patients have pre-existing severe atherosclerosis
In what part of the heart does a rhabdomyoma usually arise?
Ventricle
Clinical features of right-sided heart failure are due to __________.
Congestion
Reperfusion of irreversibly damaged cells results in _______ influx. What is the result of this?
Calcium; leading to hypercontraction of myofibrils (contraction band necrosis)
Most common type of atrial septal defect
Ostium secundum
How is dilated cardiomyopathy treated?
Heart transplant
What trends of elevation does CK-MB follow in infarction?
- levels rise 4-6 hrs after infarction
- Peak at 24 hrs
- Return to normal by 72 hrs
How does transposition of the great vessels present?
Early cyanosis because pulmonary and systemic circuits do not mix
What distinguishes rheumatic disease from “wear and tear” causing aortic stenosis?
Mitral stenosis and fusion of the aortic valve commissures
Consequences of patent ductus arteriosus
“Machine-like” murmur
Eisenmenger syndrome
- Lower extremity cyanosis
Clinical features of mitral stenosis
- Opening snap followed by diastolic rumble
- Volume overload leads to dilation of the left atrium, resulting in:
- Pulmonary congestion with edema and alveolar hemorrhage
- Pulmonary hypertension and eventual right-sided heart failure
- Atrial fibrillation with associated risk for mural thrombi
Benign hamartoma of cardiac muscle
Rhabomyoma
Cause of unstable angina
Usually due to rupture of an atherosclerotic plaque with thrombosis and incomplete occlusion of a coronary artery
Migratory polyarthritis
Swelling and pain in a large joint that resolves within days and “migrates” to involve another large joint
Major cause of mitral stenosis
Chronic rheumatic valve disease
Which chamber of the heart is typically involved in MI?
Left ventricle
*Right ventricle and both atria are generally spared
Cause of mitral valve prolapse
Myxoid degeneration (accumulation of ground substance) of the valve making it floppy
Occlusion of the left circumflex artery results in infarction of which structures?
Lateral wall of the LV
Biopsy seen in hypertrophic cardiomyopathy
Myofiber hypertrophy with disarray
Tricuspid atresia is often associated with what defect?
Atrial septal defect; resulting in a right-to-left shunt. presents with early cyanosis
Major cause of hypertrophic cardiomyopathy
Genetic mutations in sarcomere proteins (autosomal dominant)
Murmur heard in aortic stenosis
Cardiac compensation leads to a prolong asymptomatic stage during which a systolic ejection click followed by a crescendo-decrescendo murmur
Acute rheumatic fever major criteria
- Migratory polyarthritis
- Pancarditis
- Subcutaneous nodules
- Erythema marginatum
- Syndenham chorea
____________ is useful for detecting lesions on valves.
Transesophageal echocardiogram
Stable angina is relieved by ________.
Nitroglycerin
*Same for unstable angina
Nonbacterial thrombotic endocarditis is due to sterile vegetations that arise in association with a _______________ or _________________.
Hypercoagulable state; underlying adenocarcinoma
_____________ is associated with endocarditis in patients with underlying colorectal carcinoma.
Strep. Bovis
Complications of mitral valve prolaspe
Infectious endocarditis
Arrythmia
Severe mitral regurgitation
*Complications are rare
Does stable angina result from reversible or irreversible injury?
Reversible injury to myocytes (no necrosis)
osler nodes
Tender lesions on fingers or toes
narrowing of the aorta
Coractation of the aorta
Clinical features of right sided heart failure
- JVD
- Painful hepatosplenomegaly with characteristic nutmeg liver
- Dependent pitting edema
Mechanism by which strep viridians causes endocarditis
- Damaged endocardial surface develops thrombotic vegetations (platelets and fibrin)
- Transient bacteremia leads to trapping of bacteria in the vegetations
Laboratory findings in endocarditis
- Positive blood cultures
- Anemia of chronic disease (Decreased Hb, Decreased MCV, increased ferritin, decreased TIBC, decreased serum iron, and decreased % saturation
*
Quincke pulse
Pulsating nail bed
Clinical features of left-sided heart failure
- Pulmonary edema
- Dyspnea, paroxysmal nocturnal dyspnea, orthopnea, and crackes
- Intralveolar hemorrhage
- Decreased flow to kidneys
Cause of prinzmetal angina
Due to coronary artery vasoplasm
Characterized by a single large vessel arising from both ventricles
Truncus arteriosus
Loeffler syndrome
Endomyocardial fibrosis with an eosionphilic infiltrate and eosinophilia
_________ is the most common cause of endocarditis in IV drug abusers.
S.aureus
Treatment for ventricular septal defect
Surgical closure
*Small defects may close spontaneously