Week 4 Cardiovascular Function Flashcards
what class of lipids make up the plasma membrane?
phospholipids
What is the name for a bound lipid?
lipoprotein
What are the 4 main functions of lipids?
- stored energy
- make up of cellular membrane
- hormone production (estradiol/testosterone)
- production of bile acids
What organ produces cholesterol?
Liver
What are chylomicrons primarily made of (80%)?
triglycerides
What is the function of chylomicrons
supply tissue with fat from dietary ingestion of cholesterol
What is the smallest lipoprotein?
HDL
What is the largest lipoprotein
Chylomicron
Which lipoprotein causes vascular injury?
LDL
Which lipoprotein is protective to the cardiovascular system
HDL
Where are triglycerides stored?
In fat cells and liver
What protein binds to lipids to form lipoproteins?
apolipoproteins
Which apolipoprotein is attached to HDL?
Apo A1
Which apolipoprotein is attached to LDL?
Apo B
What is the function of Apo A1
To move cholesterol and phospholipids from inside cell to outer surface.
What is the function of Apo B
To carry fat and cholesterol through the bloodstream to the body.
How is hs-CRP used in cardiology? When else could it be elevated?
Non-specific test to determine risk of developing CAD. Can also be elevated in RA, MS, Lupus, etc. due to increased inflammation in autoimmune conditions.
What cardiac testing involves a CT scan?
CT calcium score. Looks for buildup of Calcium.
1-10=minimal
11-100=mild
101-400=moderate
>400=cardiologist referal
What is the optimal value of total cholesterol?
<200
What is the optimal lab value of HDL?
> 40
What is the optimal lab value of Triglycerides?
<150
What is the optimal lab value of LDL?
<100
What is the optimal lab value of Cholesterol to HDL-C Ratio? What does a high ratio indicate?
<3.5 Higher ratio = higher risk of heart disease.
What are 5 treatments for atherosclerosis?
1) Same Tx for dyslipidemia (statin, diet, exercise)
2) angioplasty (opens occlusions)
3) Laser (disintegrates plaque)
4) Atherectomy (removes plaque)
5) B-complex vitamins (reduces inflammation by lowering homocysteine levels)
What is the bpm produced by the AV node?
40-60 bpm
What is the primary pacemaker of the heart?
SA node
What rate can the ventricles generate impulses if the SA and AV nodes fail?
20-40 bpm
What are 5 infections that are associated with pericarditis?
coxsackievirus, echoviruses, HSV, CMV, HIV
What are non-infectious causes of pericarditis?
MI, thoracic trauma or surgery, cancer, Lupus, RA, scleroderma
What are the sx of acute cardiac tamponade?
Beck’s Triad: Low blood pressure, JVD, muffled heart sounds
Tachypnea
Tachycardia
What is the most serious complication associated with pericarditis and what does it do?
Cardiac tamponade. Fluid builds to the point that the heart is compressed leading to reduced cardiac output. (heart failure, death)
What is the treatment for pericarditis?
- Antibiotics - infection
- Steroid - inflammation
- Analgesics - pain
- O2
- Pericardiocentesis or pericardiectomy
Symptoms of pericartitis
- Dyspnea
- chest pain - anterior, sharp, sudden, worsens inspiration and laying flat, decreases sitting up.
- Flu-like sx
- pericardial friction rub
What are the non-infectious causes of endocarditis?
- Clot formation on valves
- Lupus “Libman-Sacks endocarditis”
- IV drug use (tricuspid valve)
What are the infections that cause endocarditis?
Strep. viridans (mouth)
Staph. aureus (skin/gut) (IV drugs)
What are the sx of endocarditis?
- Flu-like sx - fever, chills, fatigue
- heart murmur
- petechiae, under nailbed
What is the diagnostic scale used for endocartitis?
modified Duke criteria
What is the gold standard testing for myocarditis?
endomyocardial biopsy
What 2 valves are most commonly associated with valvular disorders?
Aortic and Mitral - higher pressures and work load of left side of heart.