BMC Family Practice BioMed Central Research article

Background The epidemiology of chest pain differs strongly between outpatient and emergency settings. In general practice, the most frequent cause is the chest wall pain. However, there is a lack of information about the characteristics of this syndrome. The aims of the study are to describe the clinical aspects of chest wall syndrome (CWS). Methods Prospective, observational, cohort study of patients attending 58 private practices over a five-week period from March to May 2001 with undifferentiated chest pain. During a one-year follow-up, questionnaires including detailed history and physical exam, were filled out at initial consultation, 3 and 12 months. The outcomes were: clinical characteristics associated with the CWS diagnosis and clinical evolution of the syndrome. Results Among 24 620 consultations, we observed 672 cases of chest pain and 300 (44.6%) patients had a diagnosis of chest wall syndrome. It affected all ages with a sex ratio of 1:1. History and sensibility to palpation were the keys for diagnosis. Pain was generally moderate, well localised, continuous or intermittent over a number of hours to days or weeks, and amplified by position or movement. The pain however, may be acute. Eighty-eight patients were affected at several painful sites, and 210 patients at a single site, most frequently in the midline or a left-sided site. Pain was a cause of anxiety and cardiac concern, especially when acute. CWS coexisted with coronary disease in 19 and neoplasm in 6. Outcome at one year was favourable even though CWS recurred in half of patients. Conclusion CWS is common and benign, but leads to anxiety and recurred frequently. Because the majority of chest wall pain is left-sided, the possibility of coexistence with coronary disease needs careful consideration.


Background
In recent decades international and national guidelines have been formulated to ensure that patients suffering from specific diseases receive evidence-based care [1][2][3][4]. In 2004 the National Swedish Board of Health and Welfare (SoS) published guidelines concerning the management of patients with asthma and COPD [5] based on Donabedian's theory regarding evaluation of the quality of medical care, which focuses on aspects of structure, process and outcome [6]. The guidelines describe structure indicators as basic conditions for providing good care, process indicators as measuring what is actually performed, and outcome indicators as measuring the effects on health and well-being. All of them represent quality indicators [5]. To ensure care of equally high quality for all patients throughout the country, the guidelines suggest that in the management of asthma and COPD in primary health care, quality indicators for all three aspects should be fulfilled [5]. Measuring lung function and documentation of smoking habits are important process indicators. Measuring lung function using spirometry [7] is important both for diagnosis of the diseases and for providing optimal pharmacological treatment [1,2], and the presence of nurses with specialised education and training ensures more frequent use of spirometry [8]. Regarding smoking, there is a strong relation between the development of COPD and smoking habits, and the most effective action is smoking cessation [9,10]. Giving up smoking is also of considerable benefit to asthma patients [11].
Many primary health care centres have developed Asthma and COPD Nurse Practices (ACNPs) [5,12,13] to provide good management for patients suffering from asthma or COPD. This organisation of nurse practices in primary health care is considered to be cost effective, since examination of lung function and patient follow-up are done mainly by nurses [14,15]. Specially trained nurses providing care to patients with specific diagnoses has become common [16][17][18]. A study from the UK showed that primary care nurses spend a mean of 6.6% of their time caring for patients with respiratory diseases, and 68% of this time is devoted patients with chronic respiratory illness [19]. The Swedish Association for General Practitioners (SFAM) recommends allocation of at least 30 minutes per week per 1000 patients registered at the health care centre for a satisfactory Asthma Nurse Practice (ANP) [20,21].
The aim of this study was to survey structure and process indicators, according to the asthma and COPD guidelines, in primary health care, and to identify correlations between structure and process quality results.

Methods
The study was performed in the county of Östergötland with about 420 000 inhabitants. The aspects of structure and process quality recommended in the national Swedish guidelines [5], and focused on in the study, are illustrated in table 1.

Structure quality -cross-sectional
A computer-based survey instrument, Publech ® Survey 5.6, was used to design a questionnaire that was e-mailed to all 42 primary health care centres in Östergötland, Sweden, in January 2006. The questions were based on quality indicators stipulated in the national guidelines, see table

(fixed-response questions and open-ended questions).
The manager at each health care centre was asked to answer the questionnaire.

Process quality -retrospective
The process quality was measured by retrospectively examining medical records. All centres used structured computer-based medical records with similar search terms. The study sample comprised a random sample of medical records of patients suffering from asthma or COPD who had had contact with a GP in primary health care during 2004 or 2005. Only records from individuals born in 1985 or earlier were included. One of the 42 centres was excluded for organisational reasons. A power calculation was performed to estimate the number of medical records needed to obtain statistically significant differences of 20 per cent (significance level p ≤ 0.05, power 80 per cent) between the groups according to time reserved for ACNP, and each process indicator. The calculation indicated that 1000 medical records, representing 0.24 per cent of the total number of patients registered in primary health care in the county council in 2006, would be sufficient. Thus the number of forms for examination of medical records sent to each centre was 0.24 per cent of the number of patients registered at the centre, in total 1052 forms, half for asthma records and half for COPD records. From computer generated lists of asthma patients and of COPD patients according to age, the requested number of patients was obtained in a randomised fashion. The questions on the forms concerned the process indicators listed in table 1. All questions had a fixedresponse format.
The forms for examination of medical records were sent to the nurse working at the ACNP at each centre, and this nurse was asked to perform the examination. Only centres that answered the structure survey questionnaire and also completed the medical records examination assessing process results were included in the results of the study.

Analysis
Statistical analyses were done using the computer-based analysis program SPSS version 14.0. Differences between means were analysed using the independent samples ttest. The degree of linear association between measures was assessed using Pearson's correlation coefficient. Statistical significance was defined as a p-value ≤ 0.05.

Results
Thirty-nine (93 per cent) of the 42 centres included answered the structure questionnaire and returned the forms used for examining the medical records. The number of patients at the different health care centres varied from 3785 to 20763, with an average of 10000.

Structure quality results
All 39 centres reported having an ACNP with a GP in charge, and access to a spirometer and a pulse oximeter. Two centres lacked a nebulizer. Nurses with education and training at the university level in the area of asthma and COPD were found in 26 of the 39 centres.
The amount of time reserved for ACNP in the 39 centres is presented in figure 1.

Process quality results
In total, 997 of 1052 forms were completed and returned (95 per cent), of which 497 were asthma forms and 500 were COPD forms.
The results showed that examination of lung function with PEF or spirometry, as well as documentation of smoking habits, were more frequently carried out in the ACNP than at GP consultations (table 2).

Correlations between structure and process
When comparing time reserved for ACNP with the percentage of patients in both the asthma group and the COPD group for whom the different process indicators were fulfilled, there was an increase in several of the indicators when the amount of time reached one hour per week per 1000 patients (table 3). With longer time, > 1 1/ 2 hours per week, no further improvement was found in the asthma group. A lower proportion of medical records Time (hours per week per 1000 registered patients) reserved for ACNP at each primary health care centre  There was no correlation between nurses' level of education and fulfilment of the process indicators, or between number of patients registered at each centre and frequency of examination of lung function, documentation of smoking habits, or registration of weight and pulse oxymetry.
The number of contacts each patient had had with the ACNP showed a linear association with time reserved for ACNP at each centre (p < 0.001).

Discussion
This study was a survey of the management of patients with asthma and COPD in primary health care. The results show that structure quality in terms of time reserved for ACNP is associated with the process quality of care as described in the Swedish national guidelines [5]. Measuring quality according to national guidelines is a strategy for encouraging improvement in health care. In Sweden, high quality does not generate economic benefits for the centre, but it stimulates 'intrinsic motivation', described as a desire to perform as well as possible and a sense of belonging to a group that behaves according to a shared set of values [22].
Previous studies reported that patients who consulted nurse practitioners received longer consultations, were given more information, and were generally more satisfied compared with those who had GP consultations [23,24]. The results of this study show that examination with spirometry is mainly performed in ACNP, and is infrequently done by GPs. In Spain, spirometry has been found to be underused in primary care, which affects the quality of COPD care [25,26]. Documentation of current smoking habits, which indicates that this subject has been discussed with the patient, is more frequent in ACNP records than in GP records. It is important to ask patients about their smoking habits, and to try to convince them of the benefits of smoking cessation, since it has been shown that the simple act of asking about smoking habits leads to smoking cessation in a number of patients [27].
There is reason to believe that the amount of time reserved for ACNP is an important factor in providing good quality management of these groups of patients. Another way to improve quality could be through the use of primary care models as described by Meulepas et al [28].
The optimal time for maintaining good quality regarding spirometry and current smoking documentation seems to be between 1 and 1 1/2 hours per week. More than 1 1/2 hours per week resulted in larger proportions of COPD patients being examined with pulse oximetry and having their weight registered, but not in higher levels of spirom-  etry, or more frequent documentation of smoking habits in either of the groups. Increased time resulted in more frequent visits to the ACNP by each patient. This could be considered higher quality for those particular individuals, and it is also possible that these centres manage patients with more severe forms of the diseases and therefore allocate more time to each patient. The estimation of time spent for ACNP was made by the manager at each centre, based on the economic resources allocated, and thus is considered a true value.
A strength of this study is the high response level and that almost all primary health care centres in the county council participated. A weakness is the large number of different individuals who examined the medical records, and that in many centres the nurses themselves reported their findings. However, the medical records are structured, and we believe it unlikely that the nurses reported false findings. Assessment of structure quality was carried out as a cross-sectional study, while process quality was studied retrospectively during a two-year period. This means that structure quality factors might have changed during the two-year period.
The Swedish guidelines [5] do not provide any benchmark concerning the structure or process indicators, which is why it is not possible to determine if the levels obtained are sufficient to provide optimal care. Aspects of outcome in terms of patient satisfaction or well-being were not considered in the present study, since this type of data cannot be found in the medical records. Comparing outcome with structure and process indicators would require a more extensive survey. One such study performed in the Netherlands showed that combining different disciplines in one model improved the care process and patient outcomes regarding COPD patients [29].
The most important finding of this study is the determination of the amount of time needed for ACNP in order to obtain the best process quality outcomes. We suggest that each primary health care centre should reserve at least one hour per week per 1000 registered patients in order to offer optimal management.
To our knowledge, this study is the first attempt to determine the level of time needed for ACNP in primary health care. Further research is needed to confirm the results of this study, as well as to investigate the outcomes for quality results in terms of effects on health and well-being.

Conclusion
The amount of time reserved for ACNP seems to be an important factor in providing good quality management of asthma and COPD patients. To provide these groups of patients with high process quality in primary care accord-ing to national Swedish guidelines, at least one hour per week per 1000 patients registered at the primary health care centre should be reserved for ACNP.