A workshop Flashcards Preview

Cardio Phys > A workshop > Flashcards

Flashcards in A workshop Deck (6)
Loading flashcards...
1
Q

Flow chart of increase in SBP & DBP (starting from kidneys)

A
  • Kidneys → GFR → Na/H2O balance → ECF vol → Plasma vol → blood vol → venous pressure/vol → ↑VR → ↑ventricular filing (EDV) → ↑SV → ↑CO → ↑MAP → ↑SBP/DBP
2
Q

Determinant of pulse pressure

A
  • SV
  • Arteriole compliance (also affects velocity of blood)
  • Reflected wave
3
Q

What is the ejection fraction normally?

A
  • Only ~1/2 of EDV ejected per heart beat
4
Q

Features of a reflected wave

A
  • Degree of reflection depends on TPR (↑TPR → ↑reflected wave)
  • Meets primary wave during diastole
  • BF in coronary A is during diastole as well
5
Q

What occurs to the reflected waves as a result of age

A
  • ↑age → ↑stiffness of vessls → ↑velocity → reflected wave & primary wave meet during systole
6
Q

Consequence of age on reflected waves

A
  • Results in ↑SBP & ↓DBP → ↑work of heart (needs to pump against higher pressure) → ↑need of O2 supply → Need to ↑blood in coronary A BUT DBP is low (& BF in coronary A is during diastole)