chap 15

Question 1

how much oxygen does room air contain ?

Answer 1

21 percent

Question 2

oxygen percentage in terms of FLOW of litre per minute ?

Answer 2

24 = 1 L/min
28 = 2L/min
31 = 3 L/min
36 = 4 L/min
40 = 5 L/min
44 = 6L/min

= nasal canula

48 = 7L/min
52 =8L/min
56 = 9L/min
60 = 10L

= simple face mask

15l/MIN = 65-95 PERCENT

Question 3

PaO2 should be 10 less than the inspired conc of oxygen

Answer 3

if 40 percent oxygen breathed = 5-6L/min
then Pa02 = 30 Kpa

if not something wrong with the lungs

Question 4

too much CO2 can lead to acidosis when does this happen in terms of ventilation ?

Answer 4

when patient - hyperventilating

Question 5

in cardiac arrest VBG more accurate than ABG … but post resus which is more accurate ?

Answer 5

ABG

Question 6

what will be increased after cardiac arrest ?

Answer 6

lactate - due to reduced tissue perfusion
after ROSC decreasing lactate

Question 7

why is VBG preferred in cardiac arrest ?

Answer 7

because blood being sampled after it has passed through tissue

Question 8

what are pulse oximeter affected by

Answer 8

presence of other hemoglobins - carboxyhemoglobin - carbon monoxide poisoning
methaehemoglobin
fetal hemoglobin
sickle cell disease

surgical and imagine dyes

nail varnish

motion artefact

reduced pulse volume - hypotension ! , low cardiac output . vasoconstriction , hypothermia

Question 9

what is pulse oximetry not affected by ?

Answer 9

anemia and jaundice

Question 10

disadvantage of pulseoximetre

Answer 10

does not provide reliable signal during CPR