Chapter 6: Monitoring oxygen balance and Acid-Base Status Flashcards
Normal amount of O2 delivered to tissue is __ to ___ times greater than the tissue needs
3-4
Which way do fever and acidosis shift oxygen-hemoglobin disassociation curve
To the right = Hg has lower affinity for O2 so more is delivered to tissue
What is usually the first compensatory mechanism to increase O2 delivery
increase HR
what does preload estimate
ventricular volume at the end of diastole
when is lactic acid produced
during anaerobic metabolism when cellular hypoxia occurs
Formula for BP
BP = CO X SVR
When is an arterial catheter preferred over BP cuff?
When patient us hemodynamically unstable
order of preference for arterial catheters
radial, femoral. axillary, dorsalis pedis
normal pulse pressure
30-40
What does CVP estimate
Right ventricular filling pressure normal values 2-8 mm Hg
What noninvasive test to check for fluid responsiveness
Passive leg raise
Contraindications to passive leg raises
increased abdominal pressure, increased ICP
5 Q’s acid base
- Acedemia or Alkelemia 2. Is primary process metabolic or respiratory 3. if respiratory determine if chronic or acute 4. if metabolic determine if metabolic compensation is adequare 5. always calculate the anion gap
what acid base disturbance should you use winters formula for
metabolic acidosis
Winters formula
CO2= 1.5 X [HCO3] +8 +- 2
