pressure

Question 0

1 mmHg=___cm H20

Answer 0

1 mmHg=1.35 cm H20

Question 1

one (1) atm (atmosphere) equals what in:

1. mmhg:
2. gm/cm2:
3. Bar:
4. mBar:
5. hPa:
6. psi:
7. kPa:

Answer 1

one (1) atm (atmosphere) equals what in:

1. mmhg: 760
2. gm/cm2: 1033
3. Bar: 1.01325
4. mBar: 1013
5. hPa: 1000
6. psi: 14.7
7. kPa: 101.325

Question 2

1 Bar= ____dynes/cm2

Answer 2

1 bar=106 dynes/cm2

Question 3

1 pascal(Pa)=___

Answer 3

1 Pascal=1 newton/meters2

Question 4

1 kiloPascal (kPa)=_____ Pa

Answer 4

1 kiloPascal=1000 Pa

Question 5

1. 1 atm= _____Pa
   (remember a Pa is a very small unit)
2. what is a hPa?
3. thererfore, how many hPa in 1 atm?

Answer 5

1. 1 atm=100,000 Pa
2. a hPa is a hectopascal (10(2) Pa) or 100 Pa
3. 1,000 hPa in 1 atm

Question 6

1 bar=____atm

Answer 6

1 bar=1 atm

Question 7

1. what is psia?
2. what is psig?
3. psig vs psia; what is the difference?

Answer 7

1. psia is absolute psi and has a zero point that is a vacum
2. psig is psi on a guage and its zero point is atmospheric pressure
3. psia=psig+1 atm (psia is bigger)

Question 8

___atm=___mmhg=___Bar=___mBar=___hPa=___psi=___kPa

Answer 8

1atm=760mmHg=1Bar=1000mBar=1000hPa= 14.7Psi=100kPa

Question 9

how to calculate atmospheric pressure:

Answer 9

at sea level the atmospheric pressure is 29.9 inches of mercury
(29.9 inches Hg x 25.4 mm per inch=760 mmhg)
(1 inch=2.54 cm=25.4 mm)

Question 10

how does atmospheric pressure change at sea level compared to high altitudes?

Answer 10

21% oxygen at sea level has a partial pressure of 159 mmHg
(760 x .21= 159.6)
21% oxygen at high altitude has a partial pressure of 80mmHg
–because the atmospheric pressure is only 380 mmHg–
(380 x .21=79.8 or 80)
(so divide the known % of the gas by the given atmospheric pressure to get your partial pressure.

Question 11

1. what is the pressure generated by a 2 ml syringe?

2. a 20 ml syringe?

Answer 11

1. 500 kPa (5 atm or 5x 760 mmHg= 3,800 mmHg)

2. 100 kPa (1 atm)

Question 12

why should you inject distally and slowly for Beir block?

Answer 12

if LA is pushed fast, the force of the pressure of the syringe may be greater than the cuff and push LA systemically.

Question 13

1. where is a Bourdon guage used?
2. how does it work?
3. Bourdon guage has what is called an “aneroid” manometer; what does this mean?

Answer 13

1. used for higher than 1 atm pressure (E tanks)
2. high pressure of gas causes a tube to uncoil and move a pointer
3. aneroid means without liquid (greek)

Question 14

what monitors pressure on the ADU?

Answer 14

a D-Lite sensor which monitors airway pressure

Question 15

what Low pressure conditions are detected by pressure monitoring (D-lite or whatever)?

Answer 15

Low peak inspiratory pressures:

1. disconnect
2. major leak
3. failure of fresh gas flow
4. tracheal tube leak/ extubation
5. ventilator failure, disconnected vent, incorrect vent setting
6. scavenger malfunction
7. increased compliance
8. reduced resistance

Question 16

what other pressure conditions are detected by pressure monitoring:

Answer 16

• high pressure
• sustained pressure
• sub ambient pressure
• low battery

Question 17

how can the pressure alarm be fooled?

Answer 17

• alarm not on
• threshold too low
• peep on
• elbow obstructed
• partial extubation
• disconnect

Question 18

1. what should be your low limit on your peak pressure?

2. how do you test the alarm?

Answer 18

1. 8-10 cm H2O

2. disconnect the alarm to see if alarm rings

Question 19

atmospheres:
how many pascals does each one take to make 1 atm?
1. pascals
2. hecto pascals
3. kilo pascals
4. how do the pascals relate (? kpa = ? hpa = ? pa)

Answer 19

1. 100,000 pa=1 atm
2. 1,000 hpa= 1 atm
3. 100 kpa=1 atm
4. (1 kpa = 10 hpa = 1,000 pa)

Question 20

how many bars…

1. how many pka in 1 bar?
2. how many dynes in 1 bar?
3. how many mbars in 1 bar?
4. how many atm in 1 bar?

Answer 20

1. 100 kpa in 1 bar
2. 106 dynes/cm squared in 1 bar
3. 1013 mbars in 1 bar
4. 1 atm = 1.01 bar