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      Health status and lung function in the Swedish alpha 1-antitrypsin deficient cohort, identified by neonatal screening, at the age of 37–40 years

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          Abstract

          Background

          Severe alpha 1-antitrypsin (AAT) deficiency (genotype PiZZ) is a well-known risk factor for COPD. A cohort of PiZZ and PiSZ individuals was identified by the Swedish national neonatal AAT screening program in 1972–1974 and followed up regularly since birth. Our aim was to study the lung function, respiratory symptoms and health status at the age of 38 years in comparison with a random sample of control subjects selected from the population registry.

          Methods

          The study group included 120 PiZZ, 46 PiSZ and 164 control subjects (PiMM), who answered a questionnaire on smoking habits and symptoms and the Saint George Respiratory Questionnaire (SGRQ) on quality of life. A total of 89 PiZZ, 33 PiSZ and 92 PiMM subjects underwent spirometry.

          Results

          Four percent of the PiZZ, 2% of the PiSZ and 12% of the control subjects were current smokers ( P=0.008), and 17% of the PiZZ, 9% of the PiSZ and 21% of the control subjects had stopped smoking. The PiZZ current smokers had a significantly higher (ie, poorer) median activity score according to the SGRQ than the PiZZ never-smokers ( P=0.032). The PiMM current smokers had significantly higher activity score ( P<0.001), symptom score ( P<0.001), and total score ( P=0.001) according to the SGRQ than the PiMM never-smokers. The PiZZ current smokers had a significantly lower postbronchodilator forced expiratory volume in 1 second (FEV 1)% of predicted value ( P=0.019) and FEV 1/forced vital capacity (FVC) ratio ( P=0.032) than the PiZZ never-smokers. The proportion of subjects with a FEV 1/FVC ratio of <0.70, indicating COPD, was significantly higher in the PiZZ current smokers than in the PiZZ never-smokers ( P=0.001). Among the PiSZ and PiMM subjects, the differences in lung function between the smoking subgroups were insignificant.

          Conclusion

          PiZZ current smokers were found to have signs of COPD before 40 years of age. Smoking is less common among the AAT-deficient subjects identified by neonatal screening than among their peers in the general population.

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          Most cited references 11

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          Liver disease in alpha1-antitrypsin deficiency detected by screening of 200,000 infants.

           T Sveger (1976)
          We prosepctively studied 200,000 newborns to determine the frequency and clinical characteristics of alpha1-antitrypsin deficiency. One hundred and twenty Pi Z, 48 Pi SZ, two PI Z-and one Pi S-infants were identified and followed to the age of six months. Fourteen of 120 Pi Z infants had prolonged obstructive jaundice, nine with severe clinical and laboratory evidence of liver disease. Five had only laboratory evidence of liver disease. Eight other Pi Z infants had minimal abnormalities in serum bilirubin and hepatic enzyme activity and variable hepatosplenomegaly. All 22 Pi Z infants with hepatic abnormalities, two thirds of whom were made, appeared healthy at six months of age. Ninety-eight Pi Z infants did not have clinical liver disease, but liver-function tests gave abnormal results in 44 of 84 at three months, and in 36 of 60 at six months of age. The number of small-for-gestational-age infants was greater (P less than 0.001) among those with clinical liver disease. None of the 48 Pi SZ infants had clinical liver disease, but 10 of 42 at three months and one of 22 at six months of age had abnormal liver function. The Pi Z and Pi SZ phenotypes are associated with covert or readily apparent hepatic dysfunction in the first three months of life.
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            PiSZ alpha-1 antitrypsin deficiency (AATD): pulmonary phenotype and prognosis relative to PiZZ AATD and PiMM COPD.

            The PiSZ genotype results in less severe deficiency of alpha-1 antitrypsin (AAT) than PiZZ. Less is known about phenotypic and prognostic features.
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              Alpha1-antitrypsin deficiency in 26-year-old subjects: lung, liver, and protease/protease inhibitor studies.

              Clinical and biochemical signs of lung and liver disease have been followed prospectively in a birth cohort of individuals with alpha1-antitrypsin (AAT) deficiency. At age 26 years, the focus was on clinical health, lung and liver function tests, and plasma markers of the protease/antiprotease balance. The effect of early childhood environment and symptoms was also studied. Eligible individuals were 26-year-old subjects with AAT deficiency (PiZ, n = 122; PiZ -, n = 2; PiSZ/S-, n = 53) and control subjects (PiMM, n = 44). Of the original AAT-deficient subjects, 119 completed the clinical examination and 134 answered the questionnaire. The prevalence of respiratory symptoms did not differ between the PiZ and SZ groups. Sixteen percent of PiZ and 14% of PiSZ subjects had asthma. Four current smokers (67%) and 22% of ex-smokers/never-smokers reported recurrent wheezing (p = 0.03). No difference in FEV1 or FEV1/FVC ratio was found between the PiZ, SZ (5% being smokers), and MM individuals (all nonsmokers). A decreased FEV1/FVC ratio was found in PiZ subjects with neonatal cholestasis, compared to remaining PiZ subjects (p = 0.02). Recurrent wheezers at age 2 years with AAT deficiency had decreased FEV1/FVC ratio (p = 0.025) at age 26 years. None had clinical symptoms of liver disease. Six percent of PiZ and 9% of PiSZ subjects had a marginal increase of serum alanine aminotransferase; 7% of PiZ and 4% of PiSZ had abnormal gamma-glutamyl transferase test results. The PiZ and SZ individuals had decreased plasma albumin (p = 0.0002). Secretory leukocyte protease inhibitor (SLPI) was increased in PiZ and SZ subjects compared to PiMM subjects (p = 0.0001). Neutrophil lipocalin was decreased in PiZ subjects (p = 0.0004) and PiSZ subjects (p = 0.001) compared to PiMM individuals. The elastase/AAT complex concentration was lower in AAT-deficient subjects (p = 0.0001). Twenty-six-year-old PiZ and SZ individuals (5% smokers) had normal lung function test results, and 4 to 9% had marginal deviations in liver test results. Analyses of SLPI and neutrophil lipocalin, a marker of neutrophil activity, indicate compensatory changes in the AAT-deficiency state.
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                Author and article information

                Journal
                Int J Chron Obstruct Pulmon Dis
                Int J Chron Obstruct Pulmon Dis
                International Journal of COPD
                International Journal of Chronic Obstructive Pulmonary Disease
                Dove Medical Press
                1176-9106
                1178-2005
                2017
                02 February 2017
                : 12
                : 495-500
                Affiliations
                Department of Respiratory Medicine and Allergology, Skåne University Hospital, Lund University, Malmö, Sweden
                Author notes
                Correspondence: Eeva Piitulainen, Department of Respiratory Medicine and Allergology, Skåne University Hospital, Lund University, Jan Waldenströmsgata 24, Plan 4, S-205 02 Malmö, Sweden, Tel +46 40 33 10 00, Email eeva.piitulainen@ 123456med.lu.se
                Article
                copd-12-495
                10.2147/COPD.S120241
                5298298
                © 2017 Piitulainen et al. This work is published and licensed by Dove Medical Press Limited

                The full terms of this license are available at https://www.dovepress.com/terms.php and incorporate the Creative Commons Attribution – Non Commercial (unported, v3.0) License ( http://creativecommons.org/licenses/by-nc/3.0/). By accessing the work you hereby accept the Terms. Non-commercial uses of the work are permitted without any further permission from Dove Medical Press Limited, provided the work is properly attributed.

                Categories
                Original Research

                Respiratory medicine

                smoking, screening, copd, lung function, health status, alpha 1-antitrypsin deficiency

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