Physics and Chemistry Flashcards Preview

► Med Misc 44 > Physics and Chemistry > Flashcards

Flashcards in Physics and Chemistry Deck (53)
Loading flashcards...
1

vapor pressures for VAA's are at what temperature?

20 degrees C

2

Whats the Vapor Pressure? Sevoflurane

170 mmHg (7-sevo0

3

Whats the Vapor Pressure? Enflurane

172 mmHg

4

Whats the Vapor Pressure? Isoflurane

240 mmHg

5

Whats the Vapor Pressure? Halothane

244 mmHg

6

Whats the Vapor Pressure? Desflurane

669 mmHg (des 6)

7

is the vapor pressure a function of volume, temperature, or pressure?

temperature

8

the pressure at which the gaseous state is in equilibrium with either the liquid or solid state, or with both is known as what?

the saturated vapor pressure (SVP)

9

Volatile agent in a flask is an ex of whose law

daltons

10

if Iso is added to a flask of Oxygen, what is the percent of oxygen and percent of iso In the flask above the liquid?

the VP of iso is 240 mmHg the Partial pressure of oxygen is 760 mmHg
The partial pressure of O2 after Iso is added is 520 mmHg (760-240=520mmHg)
%O2 = (520mmHg / 760 mmHg) x 100% = 68.4% O2
%iso = (240mmHg / 760 mmHg) x 100% = 31.6% iso

Formula is %gas = P gas / P total

11

Adding VAA to the wrong vaporizer:
what are the mnemonics?

HLH- high VP in Low VP = High concentration delivered
LHL- Low VP in High VP = Low concentration delivered

12

If halothane is added to Enflurane or servo what concentration will be delivered?

hal- 244 enf 172 Sevo 170
HLH
High concentration delivered

13

If halothane is added to iso vaporizer what concentration would be delivered?

Halothane 244 Iso 240
about the same

14

If ENF or Sevo added to Halothane or Iso vaporizer what concentration would be delivered?

ENF 172 sevo 170 Hal 244 iso 240
LHL
Low concentration

15

Desflurane vaporizer is heated to what temp

39 degrees C

16

why is des vaporizer heated

it is heated to almost 2 atmospheric pressures, this high pressure drives des to the gas outlet where it's diluted

17

unit conversions:
1 mmHg = ____ cm H2O

1.36 cmH2O

18

unit conversions:
1 atm = ____ mmHg = ___psi = ___kPa = ___ bar

1 atm = 760mmHg = 14.7 psi = 101 kPa = 1 bar

19

1 psi = ____ mmHg

54mmHg

20

what are gauges that measure HIGH pressures (cylinder pressures)

bourdon gauges

21

do Bourdon pressure gauges measure th pressure relative to atmospheric pressure or the absolute pressue

the pressure relative to atmospheric pressure

22

when the Bourdon gauge reads 0 the pressure inside the cylinder is equal to what?

atmospheric pressure

23

what is the formula for the law of laplace? cylindrically- shaped structures

T=P x r
T= wall tension
P= pressure
r = radius

24

Law of laplace:
states that as the structure expands (radius increases) the tension (force) in the wall of the structure does what?

Increases

25

Law of laplace:
application

a cappillary will withstand a pressure of 100mmHg for better than a vein, b/c the capillary has a tiny radius compared to a vein, so the tension in the wall of the capillary is extraordinarily smaller than that in the vein

26

Law of laplace:
Application

an aortic aneurysm is much more likely to rupture than a normal segment of the aorta b/c the radius is much larger, thereby increasing the tension on the wall to the "breaking point"

27

who's law states that the greater the tension in ventricular wall at end diastole, the greater the stroke volume

frank-starling law

28

law of laplace: Spherically shaped
what is an ex of a spherically shaped structure

alveoli

29

law of laplace: Spherically shaped
what is the formula

T= P x r / 2
or 2T= P x r

30

law of laplace: Spherically shaped
facts

tension is independent of radius for all spheres where there is a liquid-air interface (soap bubble. the pressure inside the bubble will change with its size. the smaller the radius of the bubble the greater the pressure inside the bubble.

Decks in ► Med Misc 44 Class (72):