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Provide GPs with spirometry, not spirometers
  1. Paul Enright
  1. Dr Paul Enright, University of Arizona, 4460 East Ina Rd, Tucson, AZ 85718, USA; lungguy{at}aol.com

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Investigators from Tasmania, an island state of Australia (famous for its marsupial devils), have demonstrated, in this issue of Thorax,1 that both the quantity and quality of spirometry tests provided by nurses visiting general practitioner (GP) offices were much better than when GPs were given a spirometer and taught when and how to use it (see page 408). The visiting (peripatetic or itinerant) nurses tested 59% of the target group of ever smokers over the age of 35 years, compared with only 8% tested by the GPs with their own spirometer. Quality goals for spirometry were met by 76% of the tests done by the nurses but only by 44% of the tests done by the GPs.

In this issue of Thorax, a study is described in which investigators from Poland2 offered spirometry testing by visiting nurses to all 2250 adult patients over the age of 39 years in the practice of a single GP (see page 402). Over 87% of the target group responded by scheduling a visit to the office for spirometry testing. Post-bronchodilator (post-BD) spirometry was done for those with airway obstruction pre-BD. Quality goals for spirometry were met for 92% of the tests. Post-BD airway obstruction, consistent with chronic obstructive pulmonary disease (COPD), was detected in 9% of patients.

We know that COPD is usually not detected in smokers until more than half of their lung function has been irretrievably lost, and frequently not until a severe exacerbation causes hospitalisation.3 Yet our efforts during the past 20 years to encourage GPs to regularly use office spirometers to test their high risk patients have been bedevilled by very low utilisation and poor quality,46 even when given free training, free spirometers and reimbursement for their time.

Not only is COPD greatly underdiagnosed, but it is also unconfirmed or overdiagnosed by primary care practitioners—at least in the USA, where two-thirds of those given the diagnosis and prescribed an inhaler have not had a spirometry test.7 8 Even the few GPs who routinely perform spirometry in their own office do not take the time to confirm airway obstruction post-BD. Approximately one-third of smokers with pre-BD airway obstruction do not have it post-BD.9 Using the fixed 0.70 threshold in people over the age of 50 years, or labelling those with a normal forced expiratory volume in 1 s (FEV1) as having COPD causes high false positive rates10 and is counterproductive. The resulting high COPD misclassification rates have costly personal and community consequences.11

What is the most practical solution to this problem? Simple COPD screening questions should be completed by as many smokers as possible,1214 perhaps using newspapers, magazines and the internet. In countries where biomass fuel is commonly used with poor venting for cooking or heating, never smoking women are also at an increased risk for COPD. Those with a high pre-test probability for COPD should be offered spirometry, or at least a peak expiratory flow measurement. Those with a low peak expiratory flow using a mechanical meter, or a low FEV1/forced vital capacity and low FEV1 from a good quality pre-BD spirometry test should then be tested post-BD using spirometry to confirm moderate to severe airway obstruction before considering a prescription for a COPD inhaler.15 Both of the current studies1 2 probably would have shown a lower cost per new case of COPD detected if a screening questionnaire (instead of only age and/or smoking status) had been used to determine which patients really needed spirometry testing.

All smokers, regardless of spirometry results, should be advised to quit and helped to quit using effective new medications when self-help is not good enough.16 When presented with interpreted spirometry results, GPs usually make the appropriate diagnostic and treatment decisions.1720 However, the problem remains: who is going to do all of these spirometry tests, when and where?

Our colleagues in Poland first began offering a better solution for the widespread detection and confirmation of COPD in 1999 by providing spirometry testing done by trained and experienced technologists using an accurate spirometer in convenient locations at convenient times.21 The spirometry tests were widely advertised, usually offered once a week at an outpatient clinic in each city, with all costs paid by the department of health, but only pre-BD testing was offered. At 60 sites, over 100 000 tests have been done by this programme in Poland, and relatively good rates of smoking cessation have been confirmed in subsamples with follow-up.22 23 The new study from Poland2 demonstrates that pre-BD and post-BD spirometry, offered by trained nurses at conveniently scheduled times at the office of a GP, efficiently and accurately detects COPD in adult patients (and confirms asthma in others).

At the Charing Cross Hospital in London, an “open access spirometry service” for 33 local GPs morphed into a “Community Respiratory Assessment Unit”.24 High levels of satisfaction were reported by patients and GPs during the first year. In addition to pre-BD spirometry testing provided by the Tasmanian study, the specialist nurses in London provided important additional services: post-BD spirometry when pre-BD results were abnormal, succinct spirometry interpretations back to the referring GP and 1 page educational materials on smoking, COPD and asthma. When indicated, they also checked oxygen saturation, reviewed and improved each patient’s inhaler techniques and provided help with smoking cessation.

A continuous quality improvement programme for spirometry must be implemented to minimise misclassification. The quality of all of the spirometry tests done by allied health professionals should be monitored and reported at least monthly by a pulmonary function expert. Those who cannot meet quality goals for at least eight of every 10 tests need retraining. The pulmonary function expert should also select the reference equations and conservative interpretation scheme used by the programme.

Twenty years ago, pulmonary specialists realised that GPs were not sending patients to hospital based PFT laboratories and therefore the response was to encourage GPs to purchase office spirometers. Although the price, size, quality, accuracy and features of office spirometers have dramatically improved,11 only a small fraction of GPs in most countries both purchase and regularly use office spirometers because of many barriers.6 25 The projects from Tasmania, Poland and the UK provide great examples of a better alternative: provide GPs with high quality spirometry services for high risk patients. These can be scheduled at convenient times every 1–6 weeks in each GP office, or at locations in each community with easy access.

REFERENCES

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Footnotes

  • Competing interests: None.

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