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**Ventilatory Parameters**

AKA weaning parameters

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**Parameters Respiratory Rate Tidal Volume Minute Ventilation**

Vital Capacity NIF (MIP,MIF) RSBI

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**How to measure You need some type of volume measuring device**

Wright Respirometer is a hand held device for this Measure exhaled tidal volume for one minute, it will accumulate and give you a minute ventilation

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How to Measure cont. Take the minute ventilation value and divide by the RR. This gives you the average Vt Coach the patient to do a Vital Capacity Take the largest volume you obtain With another device, a manometer, measure the amount of negative force a patient can generate Do this by attaching the manometer and occluding all air and watch the manometer

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**How to Measure cont. You should have four values**

Respiratory rate Minute ventilation Vital capacity Negative inspiratory force From these you can calculate Tidal volume RSBI

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**Respiratory Rate Normal 12-20 bpm Minimal values Less than 25 bpm**

More than 10 bpm

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**Tidal Volume The average size tidal volume**

Measure the Minute Ventilation and divide by the rate

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**Tidal Volume Normal about 5ml/kg Minimal values More than 250ml**

Minute ventilation and RSBI are more important

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**Minute Ventilation Normal 5-10 lpm Minimal Values Less than 10**

More than 5

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Vital Capacity The maximum amount of air you can breathe out after inhaling as much as possible. “take a big breath in and blow it all out” FVC is the basic test done in a PFT The patient is not to use force for this test, we are measuring just the volume

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Vital Capacity Normal Minimal values 10 ml/kg 1 liter (1000ml)

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**NIF Negative Inspiratory Force Maximum Inspiratory Pressure (MIP)**

Maximum Inspiratory Force (MIF) The maximum amount of force a patient can generate while breathing in with a closed circuit.

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NIF Normal values >100 cmH2O Minimal Values Greater than 20 cmH2O

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**RSBI Rapid Shallow Breathing Index**

The more rapid and shallow the breathing the less effective it is Respiratory rate(f) divided by tidal volume(Vt) Single best indicator of post extubation success

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RSBI Normal <105 Use the Vt and RR from the parameters gathered

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LUNG VOLUMES & CAPACITIES

LUNG VOLUMES & CAPACITIES

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