Resp Math Practice

Calculate the airway resistance (Raw) when a ventilated patient's Peak Inspiratory Pressure (PIP) is 40 cm H2O, Plateau Pressure (Pplat) is 20 cm H2O, Flow is 60 L/min, Tidal Volume is 500 ml, Set Rate is 12 breaths/min, FiO2 is 0.6, and PEEP is 5 cm H2O.

• 5 cm H2O/L/s

• 10 cm H2O/L/s

• 15 cm H2O/L/s

• 20 cm H2O/L/s

Answer explanation

Raw = (PIP – Pplat) / Flow (L/sec)

 

To convert flow to L/sec, divide the actual flow rate by 60.

 

Example 1:   Current flow = 60

·         60/60 = 1L/sec

 

Example 2:    Current flow = 45

·         45/60 = 0.75 L/sec

A patient's PIP is 35 cm H2O, Pplat is 25 cm H2O, Flow is 50 L/min, Tidal Volume is 550 ml, Set Rate is 15 breaths/min, FiO2 is 0.4, and PEEP is 8 cm H2O. What is the calculated airway resistance (Raw)?

• 6 cm H2O/L/s

• 12 cm H2O/L/s

• 18 cm H2O/L/s

• 22 cm H2O/L/s

Answer explanation

Raw = (PIP – Pplat) / Flow (L/sec)

 

To convert flow to L/sec, divide the actual flow rate by 60.

 

Example 1:   Current flow = 60

·         60/60 = 1L/sec

 

Example 2:    Current flow = 45

·         45/60 = 0.75 L/sec

Given PIP of 45 cm H2O, Pplat of 30 cm H2O, Flow of 40 L/min, Tidal Volume of 600 ml, Set Rate of 10 breaths/min, FiO2 of 0.5, and PEEP of 7 cm H2O, what is the airway resistance (Raw)?

• 4 cm H2O/L/s

• 22 cm H2O/L/s

• 14 cm H2O/L/s

• 10 cm H2O/L/s

Answer explanation

Raw = (PIP – Pplat) / Flow (L/sec)

 

To convert flow to L/sec, divide the actual flow rate by 60.

 

Example 1:   Current flow = 60

·         60/60 = 1L/sec

 

Example 2:    Current flow = 45

·         45/60 = 0.75 L/sec

Calculate the airway resistance (Raw) for a patient with PIP of 38 cm H2O, Pplat of 22 cm H2O, Flow of 70 L/min, Tidal Volume of 480 ml, Set Rate of 18 breaths/min, FiO2 of 0.7, and PEEP of 6 cm H2O.

• 4 cm H2O/L/s

• 14 cm H2O/L/s

• 10 cm H2O/L/s

• 7 cm H2O/L/s

Answer explanation

Raw = (PIP – Pplat) / Flow (L/sec)

 

To convert flow to L/sec, divide the actual flow rate by 60.

 

Example 1:   Current flow = 60

·         60/60 = 1L/sec

 

Example 2:    Current flow = 45

·         45/60 = 0.75 L/sec

With PIP at 42 cm H2O, Pplat at 28 cm H2O, Flow at 60 L/min, Tidal Volume at 520 ml, Set Rate at 20 breaths/min, FiO2 at 0.6, and PEEP at 10 cm H2O, what is the calculated airway resistance (Raw)?

• 8 cm H2O/L/s

• 28 cm H2O/L/s

• 22 cm H2O/L/s

• 14 cm H2O/L/s

Answer explanation

Raw = (PIP – Pplat) / Flow (L/sec)

 

To convert flow to L/sec, divide the actual flow rate by 60.

 

Example 1:   Current flow = 60

·         60/60 = 1L/sec

 

Example 2:    Current flow = 45

·         45/60 = 0.75 L/sec

A patient exhibits a PIP of 36 cm H2O, Pplat of 32 cm H2O, Flow of 60 L/min, Tidal Volume of 560 ml, Set Rate of 16 breaths/min, FiO2 of 0.8, and PEEP of 9 cm H2O. What is the airway resistance (Raw)?

• 32 cm H2O/L/s

• 16 cm H2O/L/s

• 8 cm H2O/L/s

• 4 cm H2O/L/s

Answer explanation

Raw = (PIP – Pplat) / Flow (L/sec)

 

To convert flow to L/sec, divide the actual flow rate by 60.

 

Example 1:   Current flow = 60

·         60/60 = 1L/sec

 

Example 2:    Current flow = 45

·         45/60 = 0.75 L/sec

Given PIP of 37 cm H2O, Pplat of 27 cm H2O, Flow of 60 L/min, Tidal Volume of 540 ml, Set Rate of 14 breaths/min, FiO2 of 0.5, and PEEP of 7 cm H2O, what is the calculated airway resistance (Raw)?

• 5 cm H2O/L/s

• 10 cm H2O/L/s

• 15 cm H2O/L/s

• 20 cm H2O/L/s

Answer explanation

Raw = (PIP – Pplat) / Flow (L/sec)

 

To convert flow to L/sec, divide the actual flow rate by 60.

 

Example 1:   Current flow = 60

·         60/60 = 1L/sec

 

Example 2:    Current flow = 45

·         45/60 = 0.75 L/sec

Calculate the airway resistance (Raw) for a patient with PIP at 41 cm H2O, Pplat at 26 cm H2O, Flow at 60 L/min, Tidal Volume at 590 ml, Set Rate at 17 breaths/min, FiO2 at 0.6, and PEEP at 8 cm H2O.

• 5 cm H2O/L/s

• 15 cm H2O/L/s

• 10 cm H2O/L/s

• 20 cm H2O/L/s

Answer explanation

Raw = (PIP – Pplat) / Flow (L/sec)

 

To convert flow to L/sec, divide the actual flow rate by 60.

 

Example 1:   Current flow = 60

·         60/60 = 1L/sec

 

Example 2:    Current flow = 45

·         45/60 = 0.75 L/sec

With PIP of 46 cm H2O, Pplat of 31 cm H2O, Flow of 60 L/min, Tidal Volume of 520 ml, Set Rate of 15 breaths/min, FiO2 of 0.7, and PEEP of 9 cm H2O, what is the calculated airway resistance (Raw)?

• 5 cm H2O/L/s

• 15 cm H2O/L/s

• 10 cm H2O/L/s

• 20 cm H2O/L/s

Answer explanation

Raw = (PIP – Pplat) / Flow (L/sec)

 

To convert flow to L/sec, divide the actual flow rate by 60.

 

Example 1:   Current flow = 60

·         60/60 = 1L/sec

 

Example 2:    Current flow = 45

·         45/60 = 0.75 L/sec

A patient exhibits a PIP of 24 cm H2O, Pplat of 21cm H2O, Flow of 60 L/min, Tidal Volume of 550 ml, Set Rate of 13 breaths/min, FiO2 of 0.8, and PEEP of 6 cm H2O. What is the airway resistance (RAW)?

• 20 cm H2O/L/s

• 12 cm H2O/L/s

• 6 cm H2O/L/s

• 3 cm H2O/L/s

Answer explanation

Raw = (PIP – Pplat) / Flow (L/sec)

 

To convert flow to L/sec, divide the actual flow rate by 60.

 

Example 1:   Current flow = 60

·         60/60 = 1L/sec

 

Example 2:    Current flow = 45

·         45/60 = 0.75 L/sec