文档介绍：肺功能测定的临床应用
首都医科大学附属北京友谊医院
王浩彦
肺功能测定内容及质控
肺功能障碍类型
临床应用
肺功能测定内容
肺通气功能
VC, FVC, FEV1, MEFR
肺容量
RV,TLC
肺弥散功能
DLco,DLco/VA
血气分析
气道激发试验
心肺运动试验
Normal Trace Showing FEV1 and FVC
1
2
3
4
5
6
1
2
3
4
Volume, liters
Time, seconds
FVC
5
1
FEV1 = 4L
FVC = 5L
FEV1/FVC =
流速容积环
Flow
[l/s]
Volume
[l]
FEV 1
Inspiration
Expiration
PIF
FIF 50
FVC
FEF 75
FEF 50
FEF 25
PEF
1 s
肺容量
Performing Spirometry
Breath in until the lungs are full
Hold the breath and seal the lips tightly around a clean mouthpiece
Blast the air out as forcibly and fast as possible. Provide lots of encouragement!
Continue blowing until the lungs feel empty
Watch the patient during the blow to assure the lips are sealed around the mouthpiece
Check to determine if an adequate trace has been achieved
Repeat the procedure at least twice more until ideally 3 readings within 200 ml are obtained
Performing Spirometry
Flow Volume Curve
Expiratory flow rate
L/sec
Volume (L)
FVC
Maximum expiratory flow (PEF)
Inspiratory flow rate
L/sec
RV
TLC
Spirometry - Quality Control
mon cause of inconsistent readings is poor patient technique
Sub-optimal inspiration
Sub-maximal expiratory effort
Delay in forced expiration
Shortened expiratory time
Air leak around the mouthpiece
Subjects must be observed and encouraged throughout the procedure