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To Perform Optimal Spirometric Measurement. Ass.Prof.Dr.Gaye Ulubay Baskent University School of Medicine Dept. of Pulmonary Diseases. Overview. Definition History of spirometry Why needed standardisation? Equipment Acceptability Repeatability Test selection. Description. - PowerPoint PPT Presentation
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To Perform Optimal Spirometric To Perform Optimal Spirometric MeasurementMeasurement
Ass.Prof.Dr.Gaye UlubayAss.Prof.Dr.Gaye UlubayBaskent University School of Medicine Baskent University School of Medicine
Dept. of Pulmonary DiseasesDept. of Pulmonary Diseases
OverviewOverview
Definition History of spirometry Why needed standardisation? Equipment Acceptability Repeatability Test selection
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DescriptionDescription
Pulmonary function testings (PFTs) are maneuvers to measure airflow and lung volumes using standardized equipments
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History of SpirometryHistory of Spirometry
1846 Hutchinson water spirometer 1933 Hermannsen MVV 1948 Normal predicted values of MVV determined 1947 Tiffeneau and Pinelli FVC
1955 Leuallen and Fowler FEF 25-75 %
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1979 Standardization of PFTs by ATS 1987 Spirometry standards revised 1991 Reference values & interpretation 1993 ERS standards 1994 BTS standards 1994 ATS standards revised 2005 ATS/ERS Task Force: General Laboratory,
spirometry,diffusion capacity, lung volumes and interpretation
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Why do we need to standards?
to reduce the noise on the signal
to ensure data are universally comparable
The standards
should not limited obtaining data on an individual
should not over ride common sense
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European Respiratory Journal 2005; 26: 153-161
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European Respiratory Journal 2005; 26: 319-338
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StandardizationStandardization
Availability of equipment Calibration control Measurement Acceptability Repeatability Reference values Interpretation
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Patients should not be tested within 1 month of a myocardial infarction
ContraindicationsContraindications
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Conditions which test could be suboptimalConditions which test could be suboptimal
Abdominal or chest pain of any causes Oral or facial pain exacerbated by a mouthpiece Stress incontinence Dementia or confusial state
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LaboratoryLaboratory
Ambient temperature, pressure and time of day must be recorded
Test should not perform below 17 Cº
Same equipment for repeat testing Same technician, same time of day Technicians should be trained once for each 3-5
years
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EquipmentsEquipments
The spirometer must be capable of measuring volume for 15s
Measuring volumes of 8L with an accuracy of at least 3 % or 0.050 L
Total resistance to airflow at 14L/s must be <1.5cmH2O/L/s
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Cihazın kontrolüCihazın kontrolü
Test Minimum interval
Kontrol
Volume Daily3L’lik şırınga ile kalibrasyon
kontrolü
Leak Daily 1 dakika 3 cm H2O basınç vererek
Volume linearity QTüm volümlerde 1L’lik kalibrasyon
şırıngasıyla
Flow linearity Her hafta En az 3 akım hızında test
Time 3 ayda bir Mekanik rekorderin saatle kontrolü
Equipment ControlEquipment Control
Check of mechanic recorder with stopwatch
QuarterlyTime
Test at least three different flow ranges
WeeklyFlow linearity
1L calibration syringe for all volumes
QuarterlyVolume linearity
3 cm H2O pressure for 1 min.DailyLeak
Calibration check with a 3L syringeDailyVolume
ControlMinimum interval
Test
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Syringe should be stored and used in a same ambient conditions with the spirometer
Syringe should be checked for leak monthly
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Ambient temperature should be 17-40 oC during calibration and tests
Air leaks should be checked every day
Leaks should be checked by applying a constant pressure of 3cmH2O
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Predicted valuesPredicted values
Weight Age (year) Height Gender Subjects with a deformity of thoracic cage
Height = arm span distance/1.06
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Patient preperationPatient preperation
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Should not smoke within at least 1h of testing Should not consume alcohol within 4 h of testing Should not performe vigorous exercise within 30
min of testing Should not wear strict clothes Should not eat a large meal within 2 hours of testing Bronchodilator medications?
Before testBefore test
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Sitting or standing position Upright sitting Nose clip Army chair Wheelchair? Obesity? False teeth?
During testDuring test
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Should be rest 5-10 min. Should be relaxed Should be informed on tests
During testDuring test
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Recommended order of testsRecommended order of tests
Dynamic studies: spirometry, flow volume loop, PEF Static lung volumes Diffusing capacity Bronchodilator test
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In spirometry;
First step is maximum inspiration
Second step is maksimum forced expiration
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Acceptability criteriasAcceptability criteriasATS/ERS Task Force 2005ATS/ERS Task Force 2005
No artefacts on spirogram: Should not cough Should not close glottis within 1s of
exhalation Should not terminate test early Should not perform variable effort Should not leak from mouthpiece Should not close of openness by mouthpiece
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Extrapolation volume
Start of test must be rapidStart of test must be rapid
1
2
3
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1 2 3 40
BACK EXTRAPOLATION
ZERO TIME (EV)
EXTRAPOLATED VOLUME
MAXIMAL INSPIRATORY
LEVEL
TIME, s
VO
LU
ME
, L
Ekstrapolation volume must be < 5% of FVC or 0.150 LA pause of < 1s at TLC after inspirium
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Exhalation:Exhalation: Exhalation time must be 6s and/or a plateau must be
seen in volume time curve The patient cannot continue further exhalation
No change in volume for 1 s at the end of exhalation
Time could be prolonged in patients with obstruction or older subjects
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End of test criteria End of test criteria
Quality control of test Quality control of test
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Volume –time display Flow- volume display
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Acceptable SpirogramAcceptable Spirogram
Volume-TimeVolume-Time Flow-VolumeFlow-Volume
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Cough in 1secondCough in 1second
Volume-Time Flow-Volume
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Glottic closureGlottic closure
Volume-Time Flow-Volume
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Variable effortVariable effortEarly terminationEarly termination
Volume-Time Flow-Volume
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Air leakAir leak
Volume-Time Flow-Volume
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Three acceptable spirograms The largest values of FVC must be < 0.150 L of each other The largest values of FEV1 must be < 0.150 L For those with an FVC of ≤ 1 L both these values are
0.100LIf both of these criteria do not meet
Continue testing until Both criteria are met with acceptable spirograms A total 8 tests have been performed The patient cannot continue
Spirometry Acceptability CriteriasSpirometry Acceptability CriteriasATS/ERS Task Force 2005ATS/ERS Task Force 2005
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Test selectionTest selection
Three tests with acceptable start of test and free from artefact are selected and saved
The largest FVC and the largest FEV1 should be recorded and FEV1 /FVC should be calculated
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Test appropriate for the repeatability criteriasTest appropriate for the repeatability criterias
Flow-VolumeVolume-Time
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TEKRARLANABİLİRLİK
Volume-Time Flow-Volume
Tekrarlanabilirlik Kriterine Uygun Olmayan TestTekrarlanabilirlik Kriterine Uygun Olmayan TestTest not appropriate for the repeatability criteriasTest not appropriate for the repeatability criterias
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StandardisationStandardisation
Interpret
FVC Maneuver
Met within acceptability criteria?
3 acceptability manoeuvers?
Met between repeatibilty criteria?
Determine the largest FVC and largest FEV1
Select maneouvre with largest FVC+ FEV1
Yes
Yes
Yes
No
No
No
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Equipment performance criteria
Equipment validation
Quality control
Perform maneuver
Measurement procedures
Acceptability
Repeatability
Reference value/ interpretation
Clinical assessment
Quality assessment Feedback to technician
41