ABG+ Acid base regulation

Question 1

how long is pulmonary transit time

Answer 1

0.75 secs

Question 2

how long is gas exchange time ( also time for O2 to finish exchanging)

Answer 2

0.25secs

Question 3

how to calculate conc of H+ from pH

Answer 3

[H+] = 10-pH

Question 4

ABG normal ranges
pH
PaCO2

Answer 4

normal
pH: 7.35-7.45
PaCO2: 4.7-6.4kPa

Question 5

ABG normal ranges
HCO3-
BE
PaO2

Answer 5

normal
HCO3-: 22 to 28mmol/L
BE: -2 - 2mmol/L
PaO2: 10- 13.5 kPa

Question 6

units of [H+]

Answer 6

mol/L

Question 7

definition of PO2

Answer 7

partial pressure of oxygen: This variable indicates how much oxygen is dissolved in the arterial blood

Question 8

definition PCO2

Answer 8

partial pressure of carbon dioxide: This variable indicates how much CO2 is dissolved in arterial blood

Question 9

definition pH

Answer 9

the ‘power of hydrogen’: This variable describes the acidity, neutrality or alkalinity of the blood.

Question 10

definition HCO3 -

Answer 10

plasma bicarbonate: This variable describes the concentration of bicarbonate dissolved in arterial blood.

Question 11

definition Base excess (BE)

Answer 11

concentration of bases (predominantly bicarbonate) compared with the ‘expected concentration