Acid-Base Balance Flashcards Preview

Cardio Pulm > Acid-Base Balance > Flashcards

Flashcards in Acid-Base Balance Deck (17):
1

PaO2 Levels

97mmHg

80-100mmHg

2

HCO3- Levels

-24 mEq/L

22-26 mEq/L

3

O2 Sat Levels

-97%

95+

4

pH Levels

7.4

7.35-7.45

5

PaCO2 Levels

40mmHg

35-45mmHg

6

HCO3- : CO2

20:1

7

3 Mechanisms to maintain acid-base balance

-buffers
-respiratory
-kidneys

8

Arterial Blood used because:

-better well-mixed sample
-how well lungs are oxygenating
-Vv reflect more what body tissues are doing

9

Kidneys

-adjusts bicarb levels
-hours to days
-reg by excreting acidic or basic urine
-incr H+-->acidic urine
-decr H+-->excrete more bicarb

10

Base Excess Levels

- 0

(-2 to +2)

11

w/x/y/z

pH/PaCO2/PaO2/HCO3-

7.4/40/98/24

12

Buffers

-chemicals present in plasma & RBC
-very rapid H2CO3 H+ + HCO3-

13

Respiratory

-adjusts CO2
-1-3 min
-incr ventilation due to incr H=, incr CO2, decr pH

14

PaO2 Normal values on room air

-Adults: 80-100 mmHg
-New Born: 40-70 mmHg

15

Hypoxia with increased A-a O2 gradient =

-indicates decreased O2 in arterial blood as compared to O2 content in alveolus & suggests LUNG PATHOLOGY

-(V/Q mismatch)

16

A-a O2 Gradient

-used to determine cause of hypoxemia

17

Hypoxia with normal A-a O2 Gradient

-normal A-a in presence of hypoxemia is due to HYPOVENTILATION not a lung disorder