The risk of post-operative pulmonary complications in lung resection candidates with normal forced expiratory volume in 1 s and diffusing capacity of the lung for carbon monoxide: a prospective multicentre study.

Introduction: According to the guidelines for preoperative assessment of lung resection candidates, patients with normal forced expiratory volume in 1 s (FEV1) and diffusing capacity of the lung for carbon monoxide (D LCO) are at low risk for post-operative pulmonary complications (PPC). However, PPC affect hospital length of stay and related healthcare costs. We aimed to assess risk of PPC for lung resection candidates with normal FEV1 and D LCO (>80% predicted) and identify factors associated with PPC. Methods: 398 patients were prospectively studied at two centres between 2017 and 2021. PPC were recorded from the first 30 post-operative days. Subgroups of patients with and without PPC were compared and factors with significant difference were analysed by uni- and multivariate logistic regression. Results: 188 subjects had normal FEV1 and D LCO. Of these, 17 patients (9%) developed PPC. Patients with PPC had significantly lower pressure of end-tidal carbon dioxide (P ETCO2 ) at rest (27.7 versus 29.9; p=0.033) and higher ventilatory efficiency (V'E/V'CO2 ) slope (31.1 versus 28; p=0.016) compared to those without PPC. Multivariate models showed association between resting P ETCO2 (OR 0.872; p=0.035) and V'E/V'CO2 slope (OR 1.116; p=0.03) and PPC. In both models, thoracotomy was strongly associated with PPC (OR 6.419; p=0.005 and OR 5.884; p=0.007, respectively). Peak oxygen consumption failed to predict PPC (p=0.917). Conclusions: Resting P ETCO2 adds incremental information for risk prediction of PPC in patients with normal FEV1 and D LCO. We propose resting P ETCO2 be an additional parameter to FEV1 and D LCO for preoperative risk stratification.

Prediction of Postoperative Complications: Ventilatory Efficiency and Rest End-tidal Carbon Dioxide.

BACKGROUND: Cardiopulmonary exercise testing parameters including ventilatory efficiency (VE/VCO2 slope) are used for risk assessment of lung resection candidates. However, many patients are unable or unwilling to undergo exercise. VE/VCO2 slope is closely related to the partial pressure of end-tidal carbon dioxide (PETCO2). We hypothesized PETCO2 at rest predicts postoperative pulmonary complications. METHODS: Consecutive lung resection candidates were included in this prospective multicenter study. Postoperative respiratory complications were assessed from the first 30 postoperative days or from the hospital stay. Student t test or Mann-Whitney U test was used for comparison. Multivariate stepwise logistic regression analysis was used to analyze association with the development of postoperative pulmonary complications. The De Long test was used to compare area under the curve (AUC). Data are summarized as median (interquartile range). RESULTS: Three hundred fifty-three patients were analyzed, of which 59 (17%) developed postoperative pulmonary complications. PETCO2 at rest was significantly lower (27 [24-30] vs 29 [26-32] mm Hg; P < .01) and VE/VCO2 slope during exercise significantly higher (35 [30-40] vs 29 [25-33]; P < .01) in patients who developed postoperative pulmonary complications. Both rest PETCO2 with odds ratio 0.90 (95% confidence interval [CI] 0.83-0.97); P = .01 and VE/VCO2 slope with odds ratio 1.10 (95% CI 1.05-1.16); P < .01 were independently associated with postoperative pulmonary complications by multivariate stepwise logistic regression analysis. There was no significant difference between AUC of both models (rest PETCO2: AUC = 0.79 (95% CI 0.74-0.85); VE/VCO2 slope: AUC = 0.81 (95% CI 0.75-0.86); P = .48). CONCLUSIONS: PETCO2 at rest has similar prognostic utility as VE/VCO2 slope, suggesting rest PETCO2 may be used for postoperative pulmonary complications prediction in lung resection candidates.

Ventilatory efficiency is superior to peak oxygen uptake for prediction of lung resection cardiovascular complications.

INTRODUCTION: Ventilatory efficiency (VE/VCO2 slope) has been shown superior to peak oxygen consumption (VO2) for prediction of post-operative pulmonary complications in patients undergoing thoracotomy. VE/VCO2 slope is determined by ventilatory drive and ventilation/perfusion mismatch whereas VO2 is related to cardiac output and arteriovenous oxygen difference. We hypothesized pre-operative VO2 predicts post-operative cardiovascular complications in patients undergoing lung resection. METHODS: Lung resection candidates from a published study were evaluated by post-hoc analysis. All of the patients underwent preoperative cardiopulmonary exercise testing. Post-operative cardiovascular complications were assessed during the first 30 post-operative days or hospital stay. One-way analysis of variance or the Kruskal-Wallis test, and multivariate logistic regression were used for statistical analysis and data summarized as median (IQR). RESULTS: Of 353 subjects, 30 (9%) developed pulmonary complications only (excluded from further analysis), while 78 subjects (22%) developed cardiovascular complications and were divided into two groups for analysis: cardiovascular only (n = 49) and cardiovascular with pulmonary complications (n = 29). Compared to patients without complications (n = 245), peak VO2 was significantly lower in the cardiovascular with pulmonary complications group [19.9 ml/kg/min (16.5-25) vs. 16.3 ml/kg/min (15-20.3); P<0.01] but not in the cardiovascular only complications group [19.9 ml/kg/min (16.5-25) vs 19.0 ml/kg/min (16-23.1); P = 0.18]. In contrast, VE/VCO2 slope was significantly higher in both cardiovascular only [29 (25-33) vs. 31 (27-37); P = 0.05] and cardiovascular with pulmonary complication groups [29 (25-33) vs. 37 (34-42); P<0.01)]. Logistic regression analysis showed VE/VCO2 slope [OR = 1.06; 95%CI (1.01-1.11); P = 0.01; AUC = 0.74], but not peak VO2 to be independently associated with post-operative cardiovascular complications. CONCLUSION: VE/VCO2 slope is superior to peak VO2 for prediction of post-operative cardiovascular complications in lung resection candidates.

Lymphangioleiomyomatosis.

BACKGROUND: Lymphangioleiomyomatosis (LAM) is a rare systemic disease that occurs sporadically (S/LAM) or as part of tuberous sclerosis (TS/LAM). LAM is characterized by proliferation of abnormal smooth muscle cells. This disease clinically manifests as dyspnea on exertion and pneumothorax. Lymphadenopathy in the abdominal and pelvic region leading to lymphatic obstruction can also occur. LAM is associated with kidney angiomyolipoma and meningioma. The disease is diagnosed histologically and/or using typical high-resolution computed tomography findings and anamnestic information. In histopathological studies, the diagnosis is supported by detection of characteristic LAM cells. Mammalian target of rapamycin (mTOR) inhibitors are possible treatment options. MATERIAL AND METHODS: Ten consecutive patients diagnosed with LAM and pulmonary manifestation (eight with S/LAM and two with TS/LAM) in 2002-2018 were retrospectively analyzed. Their individual clinical characteristics and our treatment experience are described. RESULTS: The patients varied in terms of disease stage. The best predictors of prognosis were lung function parameters (forced vital capacity, forced expiratory volume in 1 second, and diffusing capacity for carbon monoxide). Four patients are currently being treated with mTOR inhibitors. This treatment stabilized lung functions in all four patients. The median follow-up was 48 months (12-132 months). Median survival was not achieved and only three patients died. CONCLUSION: An interdisciplinary approach is required to care for LAM patients. Cooperation of pneumologists, surgeons, oncologists, and geneticists is needed. Treatment with mTOR inhibitors led to stabilization in our patients. The side effects were well managed.

Cardiopulmonary exercise testing for identification of patients with hyperventilation syndrome.

INTRODUCTION: Measurement of ventilatory efficiency, defined as minute ventilation per unit carbon dioxide production (VE/VCO2), by cardiopulmonary exercise testing (CPET) has been proposed as a screen for hyperventilation syndrome (HVS). However, increased VE/VCO2 may be associated with other disorders which need to be distinguished from HVS. A more specific marker of HVS by CPET would be clinically useful. We hypothesized ventilatory control during exercise is abnormal in patients with HVS. METHODS: Patients who underwent CPET from years 2015 through 2017 were retrospectively identified and formed the study group. HVS was defined as dyspnea with respiratory alkalosis (pH >7.45) at peak exercise with absence of acute or chronic respiratory, heart or psychiatric disease. Healthy patients were selected as controls. For comparison the Student t-test or Mann-Whitney U test were used. Data are summarized as mean ± SD or median (IQR); p<0.05 was considered significant. RESULTS: Twenty-nine patients with HVS were identified and 29 control subjects were selected. At rest, end-tidal carbon dioxide (PETCO2) was 27 mmHg (25-30) for HVS patients vs. 30 mmHg (28-32); in controls (p = 0.05). At peak exercise PETCO2 was also significantly lower (27 ± 4 mmHg vs. 35 ± 4 mmHg; p<0.01) and VE/VCO2 higher ((38 (35-43) vs. 31 (27-34); p<0.01)) in patients with HVS. In contrast to controls, there were minimal changes of PETCO2 (0.50 ± 5.26 mmHg vs. 6.2 ± 4.6 mmHg; p<0.01) and VE/VCO2 ((0.17 (-4.24-6.02) vs. -6.6 (-11.4-(-2.8)); p<0.01)) during exercise in patients with HVS. The absence of VE/VCO2 and PETCO2 change during exercise was specific for HVS (83% and 93%, respectively). CONCLUSION: Absence of VE/VCO2 and PETCO2 change during exercise may identify patients with HVS.

Transbronchial biopsy from the upper pulmonary lobes is associated with increased risk of pneumothorax - a retrospective study.

BACKGROUND: Pneumothorax (PTX) is one of the most common complications of transbronchial biopsy (TBB). Previous research suggests that upper pulmonary lobe TBB may be associated with increased risk of PTX development. The aim of this study was to compare the risk of PTX after TBB performed from different pulmonary lobes. METHODS: All bronchoscopic records from the period January 1st, 2015 - December 31st, 2017 (from the Department of Respiratory Diseases, University Hospital Brno, Czech Republic) were retrospectively analyzed. Of the 3542 bronchoscopic records, 796 patients underwent TBB and were further analyzed. Basic demographic data, TBB procedure-related factors, smoking history and radiological features were analyzed. Furthermore, in patients who developed PTX, PTX onset, PTX symptoms, distribution of the abnormal radiological findings and duration of hospitalization were also analyzed. RESULTS: Patients who developed PTX had significantly lower body mass index (BMI) and more than 4 samples taken during procedure (all p < 0.05). TBB performed from the left upper pulmonary lobe was associated with a significant risk of PTX development (OR 2.27; 95% CI 1.18-4.35; p = 0.02). On the contrary, TBB performed from the right lower lobe was associated with a significant reduction of risk of developing PTX (OR 0.47; 95% CI 0.22-0.98; p = 0.04). Logistic regression analysis showed BMI (OR 1.08; 95% CI 1.02-1.16; p = 0.01), left upper lobe as sampling site (OR 2.15; 95% CI 1.13-4.11; p = 0.02) and more than 4 samples taken (OR 1.91; 95% CI 1.04-3.49; p = 0.04) to be significantly associated with PTX development. CONCLUSIONS: We conclude that TBB from the left upper pulmonary lobe is associated with significantly increased risk of post-procedural PTX. The right lower pulmonary lobe seems to be the safest sampling site to perform TBB. In patients with diffuse-type pulmonary disease, TBB should be performed preferably from the right lower lobe in order to decrease the risk of post-procedural PTX.

Lung cancer.

Lung cancer is one of the most common cancers worldwide. Approximately 85 % of lung cancers are non-small cell lung cancers while 15 % are small cell lung cancers. Histologically, following subtypes of non-small cell cancer are distinguished: adenocarcinoma (38.5 % of all lung cancers), squamous cell carcinoma (20 %) and large cell carcinoma (3 %). Over recent years, the incidence of adenocarcinoma has been increasing. Squamous cell carcinoma is more commonly associated with smoking while adenocarcinoma is the most common histological type in non-smokers. The treatment of non-small cell lung cancer is decided according to clinical stage, morphological diagnosis, and the performance status of the patient. Early-stage patients are typically indicated for surgery. In some cases, adjuvant therapy is indicated. In locally advanced and metastatic stages, chemotherapy, biological treatment, and, recently, immunotherapy is indicated. Radiotherapy should also be considered for locally advanced disease. In small-cell lung cancer, the combination of etoposide and cisplatin or etoposide and carboplatin is still considered standard chemotherapy. Radiotherapy is an integral part of treatment of either type of lung cancer. Keywords: lung cancer, non-small cell lung cancer, small cell lung cancer, chemotherapy, biological therapy, radiotherapy, immunotherapy.

[A case of post-intubation tracheal stenosis mimicking bronchial asthma: case report]. / Prípad postintubacní stenózy trachey imitující asthma bronchiale: kazuistika.

Postintubation tracheal stenosis (PITS) is one of the most frequent causes of lower airways obstruction. Usually, PITS is the consequence of prolonged intubation period, but may occur also after short-term intubation. Diagnosis may be difficult if stridor is not present and the post-extubation period is many years long. Bronchoscopy and CT scanning are the diagnostic gold standard. In some cases, lung function tests may also be helpful. Treatment options include conservative treatment, surgery and endoscopic methods. We present a case report of a 23 year old woman with exercise dyspnoea caused by PITS that was incorrectly treated for bronchial asthma during a 2-years long period. Key words: bronchoscopy - cardiopulmonary exercise testing - postintubation stenosis - tracheal stenosis.

EMPIRE Registry, Czech Part: Impact of demographics, pulmonary function and HRCT on survival and clinical course in idiopathic pulmonary fibrosis.

INTRODUCTION: Prognostic factors of idiopathic pulmonary fibrosis (IPF) currently recognized include changes in vital capacity and radiologic findings. However, most of the prognostic studies in IPF are based on clinical studies with preselected IPF populations. Therefore, we decided to analyze the factors influencing IPF prognosis based on the real-practice data from our IPF registry. METHODS: Data of 514 subjects consecutively entered since 2012 into Czech EMPIRE IPF registry were analyzed. RESULTS: Median age of our patient cohort was 67 years (50-82). Median overall survival (OS) of the cohort was 63.1 months. The clinical course of IPF according to FVC (forced vital capacity) changes was stabilized in 32.8% of patients (29.7% according to DLCO [diffuse lung capacity] changes), slowly progressive in 39.5% (45%), rapidly progressive in 23.5% (20.7%); and 1.7% patients had at least one acute exacerbation during follow-up. Deterioration in FVC of ≥10% at month 12 and in DLCO of ≥15% at months 12, 18, and 24 influenced the OS significantly. The fast progressors defined by the DLCO decline rate had higher risk of death compared to those defined by the FVC change over time. In multivariate analysis, age ≥70 years, interstitial HRCT scores ≥3, and change in DLCO of ≥15% at month 12 were confirmed as factors negatively influencing OS. CONCLUSIONS: DLCO changes over time were shown as a better predictor of mortality compared with FVC changes in our study. In our opinion it is necessary to implement the DLCO analysis into clinical trials and routine practice.

Necrotising sarcoid granulomatosis. A rare granulomatous disease.

Introduction: Necrotizing sarcoid granulomatosis (NSG) is a very rare disease of unknown etiology characterized by sarcoid-like granulomas, vasculitis and necrosis in pulmonary and extrapulmonary localizations. Case report: We describe a case of a 34-year-old Caucasian male with fever, pleural pain, and nodular pulmonary opacities on chest radiograph. Histological examination of the lung tissue confirmed NSG. Diagnostically, infectious causes, vasculitis, and malignancy were excluded. A tendency to partial regression was observed, without the need for corticosteroid treatment. Conclusion: NSG is a rare disease which must be distinguished from other systemic diseases including vasculitides. The key to diagnosis, emphasized in our paper, is the histopathological finding. The course of NSG is similar to sarcoidosis. Corticosteroids are considered the treatment of choice, but the disease exhibits a tendency towards spontaneous regression. (Sarcoidosis Vasc Diffuse Lung Dis 2018; 35: 395-398).

Is it intestinal tuberculosis again? Case report.

This case report focuses on an immigrant admitted to the Department of Respiratory Diseases, University Hospital Brno due to suspicion of relapsing intestinal tuberculosis. The patient presented with fever, night sweat, weight loss, diarrhea, and a history of several tuberculosis attacks in the last few years. None of the examinations confirmed the presence of active tuberculosis but raised suspicion of hematological malignancy. Pancytopenia was present in the peripheral blood. However, bone marrow examination and flowcytometry excluded the presence of a hematological malignancy. The results pointed to the possibility of vitamin B12 or folate deficiency that were both confirmed consequently by serum biochemical tests. Cobalamin and folate deficiency were caused by short bowel syndrome that developed after a major intestinal resection that the patient underwent in his past. Combined treatment including vitamins, pancreatic enzymes substitution, antidiarrhoics and spasmolytics was administered. The general health status of the patient improved rapidly with restitution of hematopoiesis, weight gain, and a decrease by 80% in daily number of stools. Clinical appearance of intestinal tuberculosis, short bowel syndrome and of cobalamin and folate deficiency as well as pathophysiology, diagnosis and treatment of these uncommon or even rare diseases are discussed in this case report.Key words: intestinal tuberculosis - pancytopenia - short bowel syndrome - vitamin B12 deficiency.

Resting End-Tidal Carbon Dioxide Predicts Respiratory Complications in Patients Undergoing Thoracic Surgical Procedures.

BACKGROUND: Ventilatory efficiency (V˙e/V˙co2 slope [minute ventilation to carbon dioxide output slope]) has been shown to predict morbidity and mortality in lung resection candidates. Patients with increased V˙e/V˙co2 during exercise also exhibit an increased V˙e/V˙co2 ratio and a decreased end-tidal CO2 at rest. This study hypothesized that ventilatory values at rest predict respiratory complications and death in patients undergoing thoracic surgical procedures. METHODS: Inclusion criteria for this retrospective, multicenter study were thoracotomy and cardiopulmonary exercise testing as part of routine preoperative assessment. Respiratory complications were assessed from the medical records (from the hospital stay or from the first 30 postoperative days). For comparisons, Student's t test or the Mann-Whitney U test was used. Logistic regression and receiver operating characteristic analyses were performed for evaluation of measurements associated with respiratory complications. Data are summarized as mean ± SD; p <0.05 is considered significant. RESULTS: Seventy-six subjects were studied. Postoperatively, respiratory complications developed in 56 (74%) patients. Patients with postoperative respiratory complications had significantly lower resting tidal volume (0.8 ± 0.3 vs 0.9 ± 0.3L; p = 0.03), lower rest end-tidal CO2 (28.1 ± 4.3vs 31.5 ± 4.2 mm Hg; p < 0.01), higher resting V˙e/V˙co2 ratio (45.1 ± 7.1 vs 41.0 ± 6.4; p = 0.02), and higher V˙e/V˙co2 slope (34.9 ± 6.4 vs 31.2 ± 4.3; p = 0.01). Logistic regression (age and sex adjusted) showed resting end-tidal CO2 to be the best predictor of respiratory complications (odds ratio: 1.21; 95% confidence interval: 1.06 to 1.39; area under the curve: 0.77; p = 0.01). CONCLUSIONS: Resting end-tidal CO2 may identify patients at increased risk for postoperative respiratory complications of thoracic surgical procedures.

Monitoring the ionic content of exhaled breath condensate in various respiratory diseases by capillary electrophoresis with contactless conductivity detection.

The analysis of an ionic profile of exhaled breath condensate (EBC) by capillary electrophoresis with contactless conductivity detection and double opposite end injection, is demonstrated. A miniature sampler made from a 2 ml syringe and an aluminium cooling cylinder was used for the fast collection of EBC (under one minute). Analysis of the collected EBC was performed in a 60 mM 2-(N-morpholino)ethanesulfonic acid, 60 mM L-histidine background electrolyte with 30 µM cetyltrimethylammonium bromide and 2 mM 18-crown-6 at pH 6, and excellent repeatability of migration times (RSD <1.3% (n = 7)) and peak areas (RSD < 7% (n = 7)) of 14 ions (inorganic anions, cations and organic acids) was obtained. It is demonstrated that the analysis of EBC samples obtained from patients with various respiratory diseases (chronic obstructive pulmonary disease, asthma, pulmonary fibrosis, sarcoidosis, cystic fibrosis) is possible in less than five minutes and the ionic profile can be compared with the group of healthy individuals. The analysis of the ionic profile of EBC samples provides a set of data in which statistically significant differences among the groups of patients could be observed for several clinically relevant anions (nitrite, nitrate, acetate, lactate). The developed collection system and method provides a highly reproducible and fast way of collecting and analyzing EBC, with future applicability in point-of-care diagnostics.

Chronobiological changes in arterial blood pressure in participants of the 5th and 6th Czech Antarctic Scientific Expeditions.

OBJECTIVE: To evaluate potential changes in arterial blood pressure (ABP) and heart rate (HR) during a 2-month stay in Antarctica, using chronobiological analysis. METHODS: An observational study performed at Mendel research base, Antarctica, during 2011 and 2012. The studied group consisted of 24 participants of the 5th and 6th Czech Antarctic Scientific Expeditions. Three series of 24-hour ABP monitoring were performed, of these two in Antarctica and one in the Czech Republic. Chronobiological analyses of the data were performed (Halberg Chronobiology Center, Minnesota) using population-mean cosinor. The values of MESOR (Midline Estimating Statistic Of Rhythm), double amplitude and the acrophase were obtained for SBP (Systolic Blood Pressure), DBP (Diastolic Blood Pressure) and HR. These rhythm characteristics were compared between the two locations by parameter tests and by the paired t-test. RESULTS: On the average, the MESORs of SBP, DBP and HR were significantly higher in Antarctica than in the Czech Republic, as were the double amplitudes of the 12-hour component of SBP and DBP. High prevalence of CHAT (Circadian Hyper-Amplitude-Tension) was detected in Antarctica (8/24 = 33%); only 2 persons had CHAT in the Czech Republic (χ²=3.945, p=0.047). CONCLUSIONS: A prolonged stay in Antarctica clearly affected certain chronobiological parameters of ABP and HR.

The incidence and predictors of thromboembolic events in patients with lung cancer.

Patients with lung cancer experience elevated risk of venous thromboembolism. Cancer patients with thrombosis have a shorter life expectancy and the occurrence of VTE worsens the quality of life and may delay, interrupt, or completely halt the cancer therapy. In a large cohort of lung cancer patients we monitored the incidence of venous thromboembolism and we identified groups of patients with the highest risk of venous thromboembolism suitable for antithrombotic prophylaxis, which could favourably affect their morbidity and mortality.

Ice hockey lung - a case of mass nitrogen dioxide poisoning in the Czech Republic.

Nitrogen dioxide (NO2) is a toxic gas, a product of combustion in malfunctioning ice-resurfacing machines. NO2 poisoning is rare but potentially lethal. The authors report a case of mass NO2 poisoning involving 15 amateur ice hockey players in the Czech Republic. All players were treated in the Department of Respiratory Diseases at Brno University Hospital in November 2010 - three as inpatients because they developed pneumonitis. All patients were followed-up until November 2011. Complete recovery in all but one patient was achieved by December 2010. None of the 15 patients developed asthma-like disease or chronic cough. Corticosteroids appeared to be useful in treatment. Electric-powered ice-resurfacing machines are preferable in indoor ice skating arenas.