Effect of cannabis and tobacco on emphysema in patients with spontaneous pneumothorax.

PURPOSE: To compare imaging findings on thoracic computed tomography (CT) examination in patients with primary spontaneous pneumothorax (SP), depending on their tobacco and/or cannabis consumption. MATERIALS AND METHODS: A total of 83 patients who had thoracic CT for primary SP were prospectively included. There were 65 men and 18 women with a median age of 33 years (IQR: 27; 44 years). The patients were further categorized into three groups according to their smoking habits. Thirteen patients were non-smokers, 38 were tobacco only smokers and 32 were tobacco and cannabis smokers. CT examinations were retrospectively reviewed for the presence of blebs, centrilobular and paraseptal emphysema and lung nodules in each group for comparison. RESULTS: Emphysema was detected in 43/85 patients (51.8%), including 1/13 patients (7.7%) in the non-smoking group, 19/38 patients (50%) in the tobacco only group and 23/32 patients (71.9%) in the tobacco and cannabis smokers, with no difference between tobacco only and tobacco and cannabis smokers. No differences in type and location of emphysema was found between tobacco only and tobacco and cannabis smokers. Tobacco and cannabis smokers with emphysema were significantly younger than tobacco only smokers with emphysema (35 vs. 46 years, respectively) (P=0.009). CONCLUSION: The prevalence of emphysema visible on CT is not different between tobacco and tobacco/cannabis smokers, however, it occurs at a younger age in tobacco and cannabis smokers. This result suggests that cannabis, when added to tobacco, may lead to emphysema at a younger age.

[Flexible endoscope in thoracic surgery: CITES or cVATS?]. / L'endoscope souple en chirurgie thoracique, quel abord: CITES ou cVATS?

Early pain and persistent parietal disorders remains a major unresolved problem in thoracic surgery. Thoracotomy and the use of multiple ports in most Video Assisted Thoracic Surgery (VATS) procedures are the major cause of this persistent pain. For the last decade, a few publications describing the use of either single incision VATS and cervical thoracic approaches have been reported without significant results in comparison with current used techniques. Intercostals compression during surgery and early after by intercostals chest tube placement, are probably the major cause of postoperative pain. Flexible endoscope is currently used in several surgeries and will take more and more importance in our daily use in thoracic surgery. Instrument flexibility allows its use through minimally invasive approaches and offers a very interesting intra-thoracic navigation. We describe here the first use in France of a flexible endoscope in thoracic surgery through a single cervical incision to perform simultaneous exploration and biopsies of the mediastinum and right pleura using the original approach of Cervical Incision Thoracic Endoscopic Surgery (CITES).

[Comparative analysis of articles published by Spanish authors (1993-1997) in biomedical journals with high impact factor]. / Análisis comparativo de las publicaciones realizadas por autores españoles (1993-1997) en revistas clínicas con factor de impacto elevado.

BACKGROUND: To identify the Spanish scientific production amongst different areas of clinical knowledge, and to compare it with those of five other European Union countries. METHOD: Review of MEDLINE data base, for the period 1993-1997. Search limited to four journals, selected, for 10 different medical specialties (Cardiology, Endocrinology, Infectious Diseases, Gastroenterology-Hepatology, Haematology, Nephrology, Pneumology, Neurology, Oncology, Rheumatology). Articles published by authors from Germany, France, Italy, The Netherlands, Sweden and Spain. Journals included in the Internal Medicine subject classification were independently analysed. Data were also related with several econometric indexes. RESULTS: A total of 1,763 original articles published by Spanish authors were identified in the journal's sample over the analysed period (2.08 articles per 100 all published articles). Spain contributes to the total achieved by the six European countries analysed with 9.07 articles per 100 published articles. Gastroenterology-Hepatology was the medical specially which has more articles published by Spanish authors (total: 338 articles; 4.15 articles/100 published articles); and Oncology the one with less articles published (1.26 articles/100 published articles). The mean IF value per journal by article is highest for Gastroenterology-Hepatology (4.86 FI/article) and lowest for Pneumology (2.42 FI/article). Spain is the last amongst all six European countries analyzed in Endocrinology, Oncology and Haematology, and second to last in all others except for Gastroenterology-Hepatology (4th place). Mean cost for each article produced by Spanish authors in the analyzed sample was 0.49 US $ according the health expenditures per capita, and 0.07 US $ according the R+D expenditures per capita. Data from the independent analysis of Internal Medicine journals also showed that Gastroenterology and Hepatology is the subspecialty with a higher number of papers published in those journals. CONCLUSIONS: All efforts devoted to improve the quality of Spanish biomedical research, specially in clinical research, had produced positive, but uneven, results, measured by the number and impact factor of original articles published in top ranked biomedical journals. The overall distribution of high impact factor scientific production by specialties is poor when compared to the European Union countries included in the analysis. Those results showed several improvement opportunities. Besides increasing the overall budget for R+D, its is likely that the time has come for backing the highest quality Spanish biomedical research, the one that offers greater and better chances for achieving scientifically valid results, and is published in high impact factor biomedical journals.