The predictive value of respiratory function tests for non-invasive ventilation in amyotrophic lateral sclerosis.

BACKGROUND: Non-invasive ventilation (NIV) improves survival and quality of life in amyotrophic lateral sclerosis (ALS) patients. The timing of referral to a home ventilation service (HVS), which is in part based on respiratory function tests, has shown room for improvement. It is currently unknown which respiratory function test predicts an appropriate timing of the initiation of NIV. METHODS: We analysed, retrospectively, serial data of five respiratory function tests: forced vital capacity (FVC), peak cough flow (PCF), maximum inspiratory and expiratory pressure (MIP and MEP) and sniff nasal inspiratory pressure (SNIP) in patients with ALS. Patients who had had at least one assessment of respiratory function and one visit at the HVS, were included. Our aim was to detect the test with the highest predictive value for the need for elective NIV in the following 3 months. We analysed time curves, currently used cut-off values for referral, and respiratory function test results between 'NIV indication' and 'no-NIV indication' patients. RESULTS: One hundred ten patients with ALS were included of whom 87 received an NIV indication; 11.5% had one assessment before receiving an NIV indication, 88.5% had two or more assessments. The NIV indication was based on complaints of hypoventilation and/or proven (nocturnal) hypercapnia. The five respiratory function tests showed a descending trend during disease progression, where SNIP showed the greatest decline within the latest 3 months before NIV indication (mean = -22%). PCF at the time of referral to the HVS significantly discriminated between the groups 'NIV-indication' and 'no NIV-indication yet' patients at the first HVS visit: 259 (±92) vs. 348 (±137) L/min, p = 0.019. PCF and SNIP showed the best predictive characteristics in terms of sensitivity. CONCLUSION: SNIP showed the greatest decline prior to NIV indication and PCF significantly differentiated 'NIV-indication' from 'no NIV-indication yet' patients with ALS. Currently used cut-off values might be adjusted and other respiratory function tests such as SNIP and PCF may become part of routine care in patients with ALS in order to avoid non-timely initiation of (non-invasive) ventilation.

Respiratory function in facioscapulohumeral muscular dystrophy 1.

To test the hypothesis that wheelchair dependency and (kypho-)scoliosis are risk factors for developing respiratory insufficiency in facioscapulohumeral muscular dystrophy, we examined 81 patients with facioscapulohumeral muscular dystrophy 1 of varying degrees of severity ranging from ambulatory patients to wheelchair-bound patients. We examined the patients neurologically and by conducting pulmonary function tests: Forced Vital Capacity, Forced Expiratory Volume in 1 second, and static maximal inspiratory and expiratory mouth pressures. We did not find pulmonary function test abnormalities in ambulant facioscapulohumeral muscular dystrophy patients. Even though none of the patients complained of respiratory dysfunction, mild to severe respiratory insufficiency was found in more than one third of the wheelchair-dependent patients. Maximal inspiratory pressures and maximal expiratory pressures were decreased in most patients, with a trend that maximal expiratory pressures were more affected than maximal inspiratory pressures. Wheelchair-dependent patients with (kypho-)scoliosis showed the most restricted lung function. Wheelchair-dependent patients with (kypho-)scoliosis are at risk for developing respiratory function impairment. We advise examining this group of facioscapulohumeral muscular dystrophy patients periodically, even in the absence of symptoms of respiratory insufficiency, given its frequency and impact on daily life and the therapeutic consequences.

[When is a venous blood gas analysis sufficient in the emergency department?] / Wanneer volstaat een veneuze bloedgas op de SEH?

Blood gas analysis plays an important role in the initial assessment of a patient in the emergency ward. We present three different patient cases to illustrate when to opt for a venous or an arterial blood gas analysis. Arterial punctures are more painful and carry a higher risk of complications compared to venous punctures. It is possible to use a venous blood gas to screen for acute acid/base disturbances. Ventilatory compensation or anion gap cannot be calculated reliably with a venous blood gas. On the other hand, the diagnosis diabetic keto-acidosis can be made with a venous blood gas; this mode of sampling can also be used for lactate measurement at the emergency department as an independent prognostic marker for mortality. Venous blood gas analyses are not able to assess oxygenation. Pulse oximetry is a non-invasive alternative for arterial blood gas sampling. The use of a venous blood gas to assess a patient's ventilation is limited, whereas it can be used to diagnose carbomonoxide intoxication or methaemoglobinaemia.

Non-invasive ventilation abolishes the IL-6 response to exercise in muscle-wasted COPD patients: a pilot study.

Systemic inflammation in patients with chronic obstructive pulmonary disease (COPD) has been related to the development of comorbidities. The level of systemic inflammatory mediators is aggravated as a response to exercise in these patients. The aim of this study was to investigate whether unloading of the respiratory muscles attenuates the inflammatory response to exercise in COPD patients. In a cross-over design, eight muscle-wasted stable COPD patients performed 40 W constant work-rate cycle exercise with and without non-invasive ventilation support (NIV vs control). Patients exercised until symptom limitation for maximally 20 min. Blood samples were taken at rest and at isotime or immediately after exercise. Duration of control and NIV-supported exercise was similar, both 12.9 ± 2.8 min. Interleukin- 6 (IL-6) plasma levels increased significantly by 25 ± 9% in response to control exercise, but not in response to NIV-supported exercise. Leukocyte concentrations increased similarly after control and NIV-supported exercise by ∼15%. Plasma concentrations of C-reactive protein, carbonylated proteins, and production of reactive oxygen species by blood cells were not affected by both exercise modes. This study demonstrates that NIV abolishes the IL-6 response to exercise in muscle-wasted patients with COPD. These data suggest that the respiratory muscles contribute to exercise-induced IL-6 release in these patients.

Effects of long-acting bronchodilators and prednisolone on inspiratory lung function parameters in stable COPD.

BACKGROUND: In chronic obstructive pulmonary disease (COPD), there is a poor correlation between forced expiratory volume in 1 s (FEV1) and dyspnea following bronchodilator use. Better correlations have been observed between inspiratory lung function parameters (ILPs) and dyspnea, which drives our interest in ILPs. However, the acute and prolonged effects of long-acting bronchodilators and oral corticosteroids on ILPs have not been well investigated. Therefore, the aim of this study was to investigate the effects of these treatments on the ILPs, FEV1, dyspnea (visual analog scale (VAS)) and clinical COPD questionnaire (CCQ). METHODS: Twenty-eight stable COPD patients had their ILPs and FEV1 measured both before and 2 h after the use of a single dose of 18 mcg bronchodilator tiotropium and 50 mcg salmeterol. Thereafter, the patients were randomized to 2 weeks of treatment with 30 mg oral prednisolone once daily or oral placebo in combination with daily treatment with these two bronchodilators. Four weeks after the cessation of the randomized treatment, the ILPs and FEV1 were again measured. After each intervention, any change in the VAS score was assessed. RESULTS: With both bronchodilators, significant improvements in ILPs were demonstrated (p < 0.005), with the exception of changes in ILPs inspiratory capacity (IC) and forced inspiratory flow at 50% of the vital capacity (FIF50) after tiotropium inhalation. After 2 weeks of treatment with prednisolone, significant differences were found for ILP forced inspiratory volume in 1 s (FIV1) and FEV1 compared with placebo. These differences were no longer present 4 weeks after the cessation of prednisolone. Significant relationships between ILPs and VAS scores were only found after 2 weeks of treatment with prednisolone or placebo. CONCLUSIONS: After a single dose of long-acting bronchodilator salmeterol, significant improvements are observed in all ILPs and in FIV1 and PIF after tiotropium. Two weeks of oral corticosteroid treatment improved the FIV1 and FEV1. The dyspnea VAS score was only significantly correlated with the ILPs after 2 weeks of oral corticosteroid treatment.

The effect of bronchodilators administered via aerochamber or a nebulizer on inspiratory lung function parameters.

BACKGROUND: In chronic obstructive pulmonary disease (COPD) the clinical efficacy of bronchodilator therapy delivered via a nebulizer versus an aerochamber on FEV1 is controversial. No studies comparing changes in inspiratory pulmonary function parameters (ILPs) using these inhaler devices are currently available. This information might be of interest because due to dynamic bronchial compression, the relationship between the ILPs and dyspnea is more reliable than that between FEV1 and dyspnea. Therefore, our study aimed to investigate whether changes in ILPs after use of these inhaler devices were similar to the changes in FEV1 and correlate with VAS (Visual Analogue Scale). METHODS: Forty-one stable COPD patients participated in a crossover trial. Spirometry was performed before and after two puffs Combivent (200 mcg salbutamol and 20 mcg ipratropium per puff) using an aerochamber or 2 mL of Combivent (2.5 mg salbutamol and 250 mcg ipratropium per mL) using a nebulizer. Differences in lung function parameters and changes in VAS were measured. RESULTS: ILP values improved significantly from baseline after Combivent administration using both devices (p ≤ 0.004). With both devices, the mean percent changes were significantly greater for FEV(1) than the ILPs (p ≤ 0.003), except for IC (p = 0.19). The mean VAS score did not differ significantly between the devices (p = 0.33), but significant correlations were found between the VAS and forced inspiratory flow at 50% of the vital capacity (FIF(50)) and peak inspiratory flow (PIF) when a nebulizer was used. With an aerochamber, no significant correlations between lung function parameters and VAS were found. CONCLUSIONS: The present study demonstrates that ILPs improved significantly after using either device. Although significant correlations were found between the VAS and FIF(50) and PIF for the nebulizer, in stable COPD patients, the pMDI plus spacer is a better route of administration than a nebulizer.

Reversibility of inspiratory lung function parameters after short-term bronchodilators in COPD.

BACKGROUND: The responsiveness of short-term bronchodilator use on inspiratory lung function parameters (ILPs), including Forced Inspiratory Volume in one second (FIV(1)), Inspiratory Capacity (IC), Forced Inspiratory Flow at 50% of the vital capacity (FIF(50)), Peak Inspiratory Flow (PIF) and on the relationship between these values and dyspnea in COPD subjects has been examined only sparsely in past studies. The aim of this study was to assess the effects of inhaled salbutamol 400 mcg, ipratropium 80 mcg and a placebo on ILP and FEV(1) and their relationship to dyspnea, as measured with a Visual Analogue Scale (VAS). METHODS: A total of 85 subjects with stable COPD participated in a crossover, randomized, double-blind, placebo-controlled study. Spirometry was performed before and after inhalation of salbutamol, ipratropium or a placebo. The primary analysis was performed using 63 participants with absent reversibility. RESULTS: All ILP and FEV(1) values improved significantly after bronchodilator administration except for FIF(50) after ipratropium administration. After administration of both bronchodilators, the mean percent changes from initial values did not significantly differ between the various ILPs and FEV(1). The mean VAS score showed significant improvements after bronchodilator and placebo inhalation but did not significantly correlate with changes in lung function parameters. For each lung function parameter, patients were further classified as responders if the amount of change was greater than the coefficient of repeatability of the test. Response rates did not differ significantly between the various ILPs. Moreover, no significant differences were found between responders and non-responders with respect to dyspnea after bronchodilator inhalation. This finding applied to all ILP and FEV(1) values. CONCLUSIONS: In subjects with COPD, all ILP, FEV(1) values and VAS scores showed significant improvements after bronchodilator use as well as with placebo. However, ILPs were not more sensitive than FEV(1) for detecting responders after bronchodilator use or changes in the VAS score.

Physiologic limitations during daily life activities in COPD patients.

INTRODUCTION: Patients with COPD are known to be limited in their performance of activities of daily life (ADL). This observational study aims to investigate the ventilatory and metabolic demand of ADL in home settings of patients and evaluate possible mechanisms involved in physiological limitation during ADL in COPD. METHODS: In their home settings, 21 stable patients with COPD (GOLD II-IV, mean FEV(1) 43% predicted) were asked to perform their most dyspnea causing activities at their usual pace until symptoms discouraged further performance. Ten healthy control subjects, matched for age and gender, performed comparable activities. Ventilatory and metabolic demands of the ADL were studied using a portable breath-by-breath system. RESULTS: Compared with healthy controls, ADL time was shorter in patients (530 +/- 38 s vs. 318 +/- 37 s respectively) and activities resulted in important complaints of dyspnea. Oxygen consumption (V O(2)) during the activities was higher in patients compared to healthy subjects (957 +/- 51 vs. 768 +/- 63 mL/min resp.). Ventilatory demand (V E) for comparable activity (at isoV O(2)) was higher in patients and went together with complaints of dyspnea in patients, but not in healthy subjects. Ventilatory constraints like low ventilatory reserve and inspiratory reserve volume and dynamic hyperinflation occurred in more than 80% of the patients, especially in (very) severe patients. CONCLUSION: Patients with COPD experience limitations in the performance of ADL, which lead to reductions in ADL time and dyspnea complaints. There appears to be an important role for ventilatory limitations, which become more prominent as disease progresses.

Maximal exercise capacity in chronic obstructive pulmonary disease: a limited indicator of the health status.

BACKGROUND: Dyspnoea and diminished functional status are pivotal features of the health status (HS) in chronic obstructive pulmonary disease (COPD). However, it is still not fully understood how pulmonary function tests and cardiopulmonary exercise testing relate to these aspects. This may be due to incomplete assessment and/or deficient definitions of HS. Especially regarding peak oxygen consumption, inconsistent results have been reported. OBJECTIVES: To determine the value of maximal cycle ergometry in relation to a broad spectrum of HS aspects. METHODS: 129 patients with COPD, stage II and III according to the GOLD classification, performed a cardiopulmonary exercise test. Sixteen independent sub-domains of HS were assessed according to the Nijmegen Integral Assessment Framework, covering physiological functioning, complaints, functional impairments and quality of life as main domains. VO(2)(max) and HS sub-domains were correlated by bivariate analysis. RESULTS: Weak correlations of VO(2)(max) with most sub-domains were found, except for exercise capacity; the other 5 sub-domains of physiological functioning did not correlate. Between different types of exercise limitation (5 types were differentiated), no significant differences were noted in the scores of 13/16 HS sub-domains. CONCLUSIONS: VO(2)(max) is indeed correlated with most aspects of HS, except for physiological variables, but associations are weak. No single exercise limitation type is associated with specific HS problems. Thus separate assessment of all HS sub-domains is advocated to ensure adequate planning of therapeutic interventions.

Exercise in systemic sclerosis intensifies systemic inflammation and oxidative stress.

OBJECTIVE: Exercise testing can be used (i) to evaluate functional limitations of systemic sclerosis (SSc) and (ii) to study whether the inflammatory and oxidative systems are activated after a physical stimulus. The aim of this study was to determine exercise-induced inflammatory and oxidative responses in SSc compared with healthy subjects. METHODS: Eleven patients with SSc and pulmonary involvement and 10 healthy subjects underwent maximal cardiopulmonary exercise testing (CPET). Physiological responses were followed continuously during cycling. Blood samples were taken at rest, during and after maximal exercise to measure inflammatory and oxidative markers. RESULTS: In nine of the 11 SSc patients, cardiocirculatory limitation and gas exchange impairment limited exercise capacity. Basal inflammatory cells, interleukin (IL)-6, and oxidative stress were increased in SSc compared to healthy subjects and intensified after exercise. Basal and exercise-induced inflammation and oxidative stress were correlated with the modified Rodnan skin score. CONCLUSIONS: Although exercise capacity is impaired in patients with SSc, physical activity intensifies the already increased basal levels of systemic inflammation and oxidative stress. These data support the concept of a role for systemic inflammation and oxidative stress in the ongoing systemic effects of SSc.

Metabolic acidosis improves airway conductance in patients with asthma.

The objective was to investigate whether acute metabolic acidosis could cause bronchodilation in patients with asthma. Twelve patients with asthma (8 females, mean age 39 (+/- SD 12) years, forced expiratory volume in 1 second [FEV(1)] 93 [+/-9] % predicted, PC(20) 1.9 (+/-1.0) mg/mL) participated in a double-blind, placebo-controlled trial. Subjects ingested calculated amounts of ammonium chloride to induce acidosis or saline as placebo, in random order, each on a separate day. Airway resistance (R(aw)), specific airway conductance (sG(aw)), FEV(1), and PEF were measured as primary variables. To evaluate the consequences of alterations in bronchial contractility on the airway responsiveness, the histamine provocation test (PC(20)) was measured as secondary variable. The intervention resulted in a mean (SD) decrease in base excess from -0.5 (+/-1.4) to -3.9 (+/-1.1) mmol/L (p < 0.01) and a decrease in pH from 7.41 (+/-0.02) to 7.36 (+/-0.02) (p < 0.01). This caused a statistically significant increase in sG(aw) from 1.15 (+/-0.16) to 1.26 (+/-0.13) 1/kPa.s) (p < 0.05). Tendencies towards increase were found in PEF (7.79 (+/-2.2) versus 8.09 (+/-1.9) (NS, p = 0.10) and in FEV(1) (2.98 (+/-0.9) versus 3.06 (+/-0.9) (NS, p = 0.15). PC(20) did not change significantly. It was concluded that acute metabolic acidosis has a modest bronchodilating effect in patients with asthma.

Systemic sclerosis and its pulmonary complications in The Netherlands: an epidemiological study.

UNLABELLED: The prevalence and incidence of systemic sclerosis (SSc) in The Netherlands is unknown. The same holds true for its leading causes of death: pulmonary fibrosis and pulmonary arterial hypertension (PAH), for which effective treatment options have recently become available. OBJECTIVE: To establish the prevalence and incidence of SSc and its pulmonary complications. METHODS: Detailed information on patients in the POEMAS registry, "Pulmonary Hypertension Screening, a Multidisciplinary Approach in Scleroderma", consisting of 819 patients, was combined with a nationwide questionnaire. RESULTS: By combining the two sources the prevalence of SSc was found to be 8.9 per 100 000 adults. The incidence was 0.77 patients per 100 000 per year. PAH was diagnosed in 9.9% of SSc patients. The prevalence of interstitial lung disease in SSc varied from 19% to 47% depending on the definition used. CONCLUSION: This study clarifies the epidemiology of SSc in The Netherlands and confirms the frequent occurrence of pulmonary complications, based on 654 cases. This can and will be studied further in the ongoing POEMAS study.

Current clinical guideline definitions of airflow obstruction and COPD overdiagnosis in primary care.

The aim of the present study was to establish the agreement between two recommended definitions of airflow obstruction in symptomatic adults referred for spirometry by their general practitioner, and investigate how rates of airflow obstruction change when pre-bronchodilator instead of post-bronchodilator spirometry is performed. The diagnostic spirometric results of 14,056 adults with respiratory obstruction were analysed. Differences in interpretation between a fixed 0.70 forced expiratory volume in one second (FEV(1))/forced vital capacity (FVC) cut-off point and a sex- and age-specific lower limit of normal cut-off point for this ratio were investigated. Of the subjects, 53% were female and 69% were current or ex-smokers. The mean post-bronchodilator FEV(1)/FVC was 0.73 in males and 0.78 in females. The sensitivity of the fixed relative to the lower limit of normal cut-off point definition was 97.9%, with a specificity of 91.2%, positive predictive value of 72.0% and negative predictive value of 99.5%. For the subgroup of current or ex-smokers aged > or =50 yrs, these values were 100, 82.0, 69.2 and 100%, respectively. The proportion of false positive diagnoses using the fixed cut-off point increased with age. The positive predictive value of pre-bronchodilator airflow obstruction was 74.7% among current or ex-smokers aged > or =50 yrs. The current clinical guideline-recommended fixed 0.70 forced expiratory volume in one second/forced vital capacity cut-off point leads to substantial overdiagnosis of obstruction in middle-aged and elderly patients in primary care. Using pre-bronchodilator spirometry leads to a high rate of false positive interpretations of obstruction in primary care.

[Inhaled corticosteroids in patients with COPD: maintain current guidelines]. / Inhalatiecorticosteroïden bij patiënten met COPD: bestaande richtlijnen handhaven.

The use of inhaled corticosteroids (ICS) is one of the most controversial issues in COPD treatment. There is evidence that ICS with or without long-acting beta-2-adrenergics (LABA) reduce exacerbation rates and improve the health status of severe COPD patients. The effects on FEV1 are limited and their effect on survival is unknown. Recently, a worldwide double-blind placebo-controlled study 'Towards a revolution in COPD health' (TORCH) was published in which salmeterol 50 microg and fluticasone 500 microg twice daily was compared with placebo, salmeterol alone or fluticasone alone. Of the 6112 included patients 875 died within 3 years after the start of treatment. Death rate, defined as the primary outcome parameter, was not significantly reduced (p = 0.052) while exacerbation frequency and health status improved in the combination therapy group. The TORCH trial therefore does not change current guidelines regarding trial treatment with ICS in severe COPD patients.

Systemic immunological response to exercise in patients with chronic obstructive pulmonary disease: what does it mean?

Chronic obstructive pulmonary disease (COPD) is no longer seen as a pulmonary disease, but is increasingly associated with systemic effects with important clinical relevance. Systemic immunological changes in COPD patients are characterized by an increased number of circulating inflammatory cells, functional changes of the inflammatory cells, elevated plasma levels of cytokines, and oxidative stress. Physical exercise induces an abnormal systemic inflammatory and oxidative response in COPD patients, which is seen in both the circulation and the peripheral muscles. Although mechanisms and consequences of these effects are not yet fully understood, they could be harmful in COPD patients by inducing damage or functional changes in, for example, skeletal muscles. Whether these changes of the immune system can also affect the susceptibility to infections in these patients is unknown. The concept of COPD as a systemic rather than only a pulmonary disease also opens new perspectives on the development for new therapeutic interventions. The effects of new antioxidative and anti-inflammatory agents are investigated. A better understanding of the complexity of the systemic effects will aid the development of new therapies and management strategies for patients with COPD.

Pulmonary hypertension: its diagnosis and management, a multidisciplinary approach.

Pulmonary hypertension is a devastating complication of various, but rare diseases and can also occur as an isolated entity. It causes morbidity and mortality in all patients. Ongoing research has provided some insight into the pathophysiology and clinical manifestations, and new therapeutic options have recently become available for some types of pulmonary hypertension. In order to provide optimal care for an individual patient it is mandatory to establish the type and severity of the pulmonary hypertension in each patient. The diagnostic protocol used in our hospital is presented along with a description of two case histories. An algorithm of the different therapeutic strategies now available is given as well as recommendations for follow-up.

[Therapeutic dilemmas in patients with a centrally-located pulmonary embolism confirmed by spiral CT-scan but with no cardiogenic shock]. / Dilemma's rond de behandeling van patiënten met een centrale longembolie op de spiraal-cT-scan zonder tekenen van cardiogene shock.

3 patients, 2 women aged 64 and 44 and 1 man aged 67, had severe dyspnoea and a large centrally-located pulmonary embolism (PE) without any accompanying arterial hypotension. They were all given conventional anticoagulation therapy, although thrombolytic therapy was also considered. The women recovered but the man eventually died of a second massive embolism. PE is a disease with a potentially high mortality. Patients with cardiogenic shock due to PE are candidates for thrombolytic therapy. A subset of patients with right-ventricular dysfunction (submassive PE) also have a poorer prognosis despite the absence ofarterial hypotension or shock. Spiral CT-scan is becoming the first-line imaging test of preference in patients with suspected PE. Spiral CT enables the accurate visualization ofthrombi. The value of risk management using cardial biomarkers, spiral CT and echocardiography is not yet clear. There is no evidence that thrombolytic therapy is beneficial in patients with acute PE and right-ventricular dysfunction without overt shock.

Skeletal muscle contractility is preserved in COPD patients with normal fat-free mass.

AIM: Peripheral muscle dysfunction often occurs in patients with chronic obstructive pulmonary disease (COPD). The muscle dysfunction may be caused by a loss of force-generating capacity, resulting from a loss of muscle mass, as well as by other alterations in contractile properties of skeletal muscle. METHODS: The maximal isometric voluntary strength and fatigability were determined in hand-grip and quadriceps muscles from nine male COPD patients (FEV(1) 30-50% predicted) and control subjects matched for fat-free mass (FFM), physical activity level and age. Contractile properties and fatigability of the quadriceps muscle were also studied with electrically evoked isometric contractions. RESULTS: The maximal voluntary force (MVC) and fatigability of the handgrip muscle did not differ between the COPD patients and control subjects. Also the MVC of the quadriceps muscle and the rate of force rise, contraction time, force-frequency relationship and fatigability, as determined with electrically evoked contractions, were similar in patients with COPD and control subjects. CONCLUSION: Skeletal muscle strength, contractile properties and fatigability are preserved in patients with moderate COPD and a normal FFM and activity level. This suggests that skeletal muscle dysfunction does not take place during moderate COPD until cachexia and/or a decline in physical activity occur.

Combined treatment with acetazolamide and medroxyprogesterone in chronic obstructive pulmonary disease patients.

Medroxyprogesterone acetate (MPA) and acetazolamide (ACET) are two ventilatory stimulants which are used in hypoxic and hypercapnic patients with chronic obstructive pulmonary disease (COPD). In a double-blind randomised study, the effects of a 2-week treatment with MPA (30 mg b.i.d.) or ACET (250 mg b.i.d.), followed by a 2-week treatment with a combination of both drugs (MPA/ACET), on daytime and nocturnal ventilatory and blood gas parameters in 17 stable hypercapnic COPD patients were investigated. ACET, MPA and MPA/ACET treatment decreased mean daytime carbon dioxide tension in arterial blood by 0.4, 0.7 and 1.2 kPa, respectively. Minute ventilation was improved only with combined therapy, from 9.3 to 11.2 L x min(-1). With MPA/ACET therapy, the hypercapnic and hypoxic ventilatory responses significantly increased, from 3.7 to 5.8 L x min(-1) x kPa(-1) and from -0.13 to -0.40 L x min(-1) x %(-1), respectively. The mouth exclusion pressure response to hypoxia increased during combination therapy, from -0.01 to -0.03 kPa %(-1). Nocturnal end-tidal carbon dioxide tension decreased with MPA and MPA/ACET treatment, by 0.9 and 1.4 kPa, respectively. MPA/ACET significantly increased mean nocturnal arterial oxygen saturation values, from 85.5 to 90.2%. The authors conclude that short-term combined treatment with medroxyprogesterone acetate and acetazolamide has a more favourable effect on day and night-time blood gas values and chemical drive than single drug treatment.

Pleural small cell carcinoma in pre-existent asbestos related pleural disease.

Extrapulmonary small cell carcinoma (SCC) is a very rare disease, and a primary pleural manifestation is extremely rare. A case of SCC of the pleura in a 66-year-old man with pre-existent asbestos-related pleural plaques is presented. This is the first case of pleural SCC in a patient with asbestos-induced pleural disease and the third reported case of a pleural SCC. The SCC developed in an area with pre-existent pleural thickening, underlining the need for careful analysis of alterations in the manifestation of pleural disease in patients with asbestos exposition.