What does increased SVC pressure indicate in a differential diagnosis?
- SVC obstruction
- Lung cancer
- Stricture from long-term cannulation
- Right heart failure
These conditions can lead to increased pressure in the superior vena cava.
What are the potential causes of increased SVC volume?
- Vein of Galen aneurysm
- Upper extremity AVM
- Partial anomalous pulmonary venous connection
- Interruption of the IVC with azygos continuation
Increased volume in the superior vena cava can result from these vascular anomalies.
What does AVM stand for in the context of vascular conditions?
Arteriovenous malformation
AVMs are abnormal connections between arteries and veins, bypassing the capillary system.
What is the significance of the inferior vena cava (IVC) in the context of SVC conditions?
Interruption of the IVC with azygos continuation
This condition can lead to increased SVC volume and is part of the differential diagnosis.
What are the valvular causes of aortic stenosis?
- Congenital
- Bicuspid
- Unieuspid
- Diaphragm with central hole
- Tricuspid with unequal cusps that are partially fused
- Acquired
- Rheumatic
- Degenerative calcific
- Atherosclerotic in hypercholesterolemia
- Vegetations of infective endocarditis and Libman-Sacks thrombosis
These causes can be classified into congenital and acquired types.
Name the subvalvular causes of aortic stenosis.
- Discrete subaortic stenosis
- Membranous diaphragm
- Muscle bar
- Fibromuscular tunnel
- Malalignment of the interventricular septum
- Parachute mitral valve with single large papillary muscle
- Hypertrophic cardiomyopathy with obstruction (idiopathic hypertrophic subaortic stenosis) with systolic anterior motion of the mitral valve
Subvalvular causes involve structural abnormalities below the aortic valve.
What are the supravalvular causes of aortic stenosis?
- Hourglass shape of ascending aorta
- Membranous diaphragm above aortic root
- Diffuse aortic hypoplasia
Supravalvular causes refer to abnormalities above the aortic valve.
True or false: Aortic stenosis can be caused by both congenital and acquired factors.
TRUE
Aortic stenosis has various causes, including congenital defects and acquired conditions.
Fill in the blank: Aortic stenosis can be caused by _______ abnormalities.
valvular, subvalvular, supravalvular
These categories encompass a range of structural issues affecting the aortic valve and surrounding areas.
What is the maximal jet velocity (m/s) for normal aortic stenosis?
<2.0
This indicates that the blood flow velocity through the aortic valve is within normal limits.
What is the valvular area (cm²) for severe aortic stenosis?
<1.0
A valvular area less than 1.0 cm² indicates significant obstruction.
What is the pressure gradient (mm Hg) for moderate aortic stenosis?
25-40
This range indicates a moderate level of obstruction in blood flow.
What is the maximal jet velocity (m/s) for mild aortic stenosis?
2.0-3.0
This indicates a mild level of obstruction in blood flow through the aortic valve.
What is the pressure gradient (mm Hg) for normal aortic stenosis?
<5
This indicates that there is no significant obstruction to blood flow.
What is the valvular area (cm²) for moderate aortic stenosis?
1.0-1.5
This indicates a moderate level of obstruction in blood flow.
What is the maximal jet velocity (m/s) for severe aortic stenosis?
> 4.0
This indicates a severe level of obstruction in blood flow through the aortic valve.
What is the pressure gradient (mm Hg) for severe aortic stenosis?
≥40
This indicates a very high level of obstruction in blood flow.
What are the leaflet abnormalities that can cause aortic regurgitation?
- Bicuspid aortic valve
- Rheumatic valvular disease
- Myxomatous degeneration
- Rheumatoid arthritis
- Infective endocarditis
These conditions affect the structure and function of the aortic valve leaflets.
Name the causes related to aortic or annular dilatation that can lead to aortic regurgitation.
- Annuloaortic ectasia
- Marfan syndrome
- Hypertension
- Aortic aneurysm
- Sinus of Valsalva aneurysm
These conditions involve changes in the aorta or its annulus, affecting valve function.
What are the leaflet abnormalities that can cause aortic regurgitation?
- Bicuspid aortic valve
- Rheumatic valvular disease
- Myxomatous degeneration
- Rheumatoid arthritis
- Infective endocarditis
These conditions affect the structure and function of the aortic valve leaflets.
Name the causes related to aortic or annular dilatation that can lead to aortic regurgitation.
- Annuloaortic ectasia
- Marfan syndrome
- Hypertension
- Aortic aneurysm
- Sinus of Valsalva aneurysm
These conditions involve changes in the aorta or its annulus, affecting valve function.
What are the causes of pulmonary stenosis categorized as?
- Valvular
- Subvalvular
- Supravalvular
Each category includes congenital and acquired causes.
Name a congenital cause of valvular pulmonary stenosis.
- Bicuspid
- Dysplastic with thickened immobile cusps (seen in Noonan syndrome)
Congenital causes are inherent structural abnormalities present at birth.
What is a rare acquired cause of valvular pulmonary stenosis?
Rheumatic heart disease
This condition is infrequent in the context of pulmonary stenosis.
