First Aid pg 271-275 Cardio Flashcards
What is the O2 saturation of umbilical vein/arteries?
Vein = 80% saturation, A= very low
pO2 of umbilical saturation?
pO2 = 20 mmHg
What is the change in pressure that allows the foramen ovale to close?
At birth, the infant takes a breath - there is a decreased resistance in pulmonary a/v and the LA pressure increases versus the R atrial pressure makes the foramen ovale closes
What process leads to the closure of ductus arteriosus?
Higher levels of O2 from respiration and decrease in prostaglandins due to placental seperation lead to closure of ductus arteriosus?
Which drug aids in closing PDA? What keeps it open?
Close PDA - Indomethacin
Keep PDA open - PGE1 & PGE2
With what disease would you want to keep a PDA open?
Transposition of vessels, Pulm atresia
What is the origin of the nucleus palposis?
Notochord
Occlusion of which artery with lead to nodal dysfuntion? Symptoms?
RCA - brady, heart block
When is peak coronary blood flow?
early diastole
Most common location of coronary a occlusion?
LAD
Hoarseness or dysphagia can occur with enlargement of which chamber?
Left atrium
How is CO maintained in early and late stages of exercise?
Early - inc HR, SV
Late - only inc HR (SV plateaus)
What leads to inc pulse pressure?
Hyperthyroidism Aortic Regurgitation Aortic stiffening (isolate systolic HTN in elderly) Obstructive sleep apnea (Inc SANS tone) Exercise
Which conditions lead to dec pulse pressure?
Aortic stenosis
Cardiogenic shock
cardiac tamponade
advanced CHF
SV is inc by which parameters?
inc Contractility
dec Afterload
inc Preload
