PEF Flashcards

1
Q

PEF stand for?

A

Peak Expiratory Flow

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2
Q

Define PEF

A

Its the maximal Flow taken During FVC maneuvers

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3
Q

If PEF reported from FVC maneuvers, it’s expressed in?

A

L/sec

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4
Q

If PEF reported from Peak flow meter, it’s expressed in?

A

L/min

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5
Q

3 ways to obtain PEF?

A

1) FVC maneuver
2) a device that directly measures flow
3) volume displacement spirometer and driving flow from volume change

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6
Q

PEF Technique

A

1) set the device or zeroed as required
2) positions
*Standing position for peak flow meter
*setting upright position for FVC maneuvers
3) maximal inhalation ( rapid but not forced)
4) rapid maximal exhalation asa soon as teeth and lips around mouthpiece ( 1 to 2 sec )
5) neck in natural position
6) no more than 1sec for hesitation

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7
Q

Why the neck should be in natural position during PEF?

A

To avoid tracheal compression because it will reduce PEF

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8
Q

PEF depends on?

A

Effort dependent

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9
Q

How to report PEF?

A

at least three performed and recorded with the order in which the values were obtained

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10
Q

Why all readings of PEF should be recorded?

A

To detect induced bronchospasm

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11
Q

List the criteria of acceptability of PEF

A

1) position ( standing or setting upright
2) maximum inhalation bu not force, maximum exhalation without holding breath
3) at least 3 trials performed amd recorded in order
4) Two of the 3 should be repeatable ( within 0.67l/sec or 40l/min )
5) largest PEF reported

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12
Q

What is more important in Peak flow meter ( precision or accuracy) and why?

A

Precision
To detect changes from serial measurements

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13
Q

What ranges should PEF have?

A

For children
60 - 400 l/min
For Adults
100 - 850 l/min

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14
Q

PEF measurements are particularly useful For who? and when?

A

Monitoring asthmatic patients at home

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15
Q

Why daily monitoring of asthmatic patients is useful?

A

For early detection of asthmatic episodes

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