No abstract available.
Carcinoma in Situ ; Gas, Natural

Objective: To investigate the level of psychosocial factors in workplace and their health effects among workers in a natural gas field. Methods: A prospective and open cohort of natural gas field workers was established to study the level of workplace psychosocial factors and their health effects, with a follow-up every 5 years. In October 2018, a cluster sampling method was used to conduct a baseline survey of 1737 workers in a natural gas field, including a questionnaire survey on demographic characteristics, workplace psychosocial factors and mental health outcomes, physiological indicators such as height and weight, and biochemical indicators such as blood routine, urine routine, liver function and kidney function. The baseline data of the workers were statistically described and analyzed. The psychosocial factors and mental health outcomes were divided into high and low groups according to the mean score, and the physiological and biochemical indicators were divided into normal and abnormal groups according to the reference range of normal values. Results: The age of 1737 natural gas field workers was (41.8±8.0) years old, and the length of service was (21.0±9.7) years. There were 1470 male workers (84.6%). There were 773 (44.5%) high school (technical secondary school) and 827 (47.6%) college (junior college) graduates, 1490 (85.8%) married (including remarriage after divorce), 641 (36.9%) smokers and 835 (48.1%) drinkers. Among the psychosocial factors, the detection rates of high levels of resilience, self-efficacy, colleague support and positive emotion were all higher than 50%. Among the mental health outcomes evaluation indexes, the detection rates of high levels of sleep disorder, job satisfaction and daily stress were 41.82% (716/1712), 57.25% (960/1677) and 45.87% (794/1731), respectively. The detection rate of depressive symptoms was 22.77% (383/1682). The abnormal rates of body mass index (BMI), triglyceride and low density lipoprotein were 46.74% (810/1733), 36.50% (634/1737) and 27.98% (486/1737), respectively. The abnormal rates of systolic blood pressure, diastolic blood pressure, uric acid, total cholesterol and blood glucose were 21.64% (375/1733), 21.41% (371/1733), 20.67% (359/1737), 20.55% (357/1737) and 19.17% (333/1737), respectively. The prevalence rates of hypertension and diabetes were 11.23% (195/1737) and 3.45% (60/1737), respectively. Conclusion: The detection rates of high level psychosocial factors in natural gas field workers are high, and their effects on physical and mental health remain to be verified. The establishment of a cohort study of the levels and health effects of psychosocial factors provides an important resource for confirming the causal relationship between workplace psychosocial factors and health.
Humans ; Male ; Adult ; Middle Aged ; Natural Gas ; Cohort Studies ; Prospective Studies ; Oil and Gas Fields ; Workplace/psychology* ; Surveys and Questionnaires

Lung cancer is a leading cause of cancer-related death in the world. Smoking is definitely the most important risk factor for lung cancer. Radon (222Rn) is a natural gas produced from radium (226Ra) in the decay series of uranium (238U). Radon exposure is the second most common cause of lung cancer and the first risk factor for lung cancer in never-smokers. Case–control studies have provided epidemiological evidence of the causative relationship between indoor radon exposure and lung cancer. Twenty-four case–control study papers were found by our search strategy from the PubMed database. Among them, seven studies showed that indoor radon has a statistically significant association with lung cancer. The studies performed in radon-prone areas showed a more positive association between radon and lung cancer. Reviewed papers had inconsistent results on the dose–response relationship between indoor radon and lung cancer risk. Further refined case–control studies will be required to evaluate the relationship between radon and lung cancer. Sufficient study sample size, proper interview methods, valid and precise indoor radon measurement, wide range of indoor radon, and appropriate control of confounders such as smoking status should be considered in further case–control studies.
Lung Neoplasms* ; Lung* ; Natural Gas ; Radium ; Radon* ; Risk Factors* ; Sample Size ; Smoke ; Smoking ; Uranium

BACKGROUND: Minimal-flow anesthesia can meet the demands of a modern society that is more sensitive to environmental protection and economic burdens. This study compared the safety and efficacy of minimal-flow desflurane anesthesia with conventional high-flow desflurane anesthesia for prolonged laparoscopic surgery. METHODS: Forty-six male patients (ASA physical status II or III) undergoing laparoscopic urologic surgery for more than 6 hours were randomly divided into two groups: the high-flow (HF) group and the minimal-flow (MF) group. The HF group was continuously administered a fresh gas flow of 4 L/min. In the MF group, a fresh gas flow of 4 L/min was administered for the first 20 minutes and was thereafter lowered to 0.5 L/min. Inspiratory and expiratory desflurane concentrations, respiratory variables, and hemodynamic variables were continuously monitored during administration of anesthesia. Measurements of carboxyhemoglobin (COHb) concentration and arterial blood gas analysis were performed every 2 hours during anesthesia. Serum aspartate aminotransferase (AST), alanine aminotransferase (ALT), blood urea nitrogen (BUN) and creatinine were measured on the first and second day after the surgery. RESULTS: Demographic data and duration of anesthesia were not different between the two groups. Significant differences were not observed between the two groups in terms of hemodynamic variables, respiratory variables, and inspiratory and expiratory desflurane concentrations. Inspiratory O2 concentration was maintained lower in the MF group than in the HF group (43-53% vs. 53-59%; P < 0.05). Compared with the HF group, COHb concentrations was higher (P < 0.05), but not increased from the baseline value in the MF group. Serum AST, ALT, BUN, and creatinine were not significantly different between the two groups. CONCLUSIONS: In prolonged laparoscopic surgery, no significant differences were found in safety and efficacy between minimal-flow and high-flow desflurane anesthesia.
Alanine Transaminase ; Anesthesia ; Aspartate Aminotransferases ; Blood Gas Analysis ; Blood Urea Nitrogen ; Carboxyhemoglobin ; Natural Resources ; Creatinine ; Hemodynamics ; Humans ; Isoflurane ; Laparoscopy ; Male

BACKGROUND: Perfluorocarbon (PFC) liquids have high oxygen carrying capacity and relatively low surface tension allowing them to spread evenly through the diseased lung, especially in the case of adult respiratory distress syndrome. But few studies have demonstrated the effects of PFC on a bronchoconstriction model. The aim of this study was to investigate the effects of PFC on pulmonary mechanics and gas exchange in methacholine-induced bronchoconstricted cats using a flow interruption technique. METHODS: Twenty male cats were divided into four groups; control group (group C, n = 5), PFC group (group P, PFC 5 ml/kg, n = 5), methacholine group (group M, 25 microgram/kg/min, n = 5), PFC and methacholine group (group MP, n = 5). Respiratory pressure using a flow interruption technique was measured immediately after stabilizing the heart rate and blood pressure 0, and 15, 30 and 60 min after the start of the intratracheal administration of PFC and/or methacholine infusion, depending on the group. Arterial blood gas analysis was done to compare arterial partial oxygen pressure among the groups at the time of measuring the pressure values. The pressure data was transferred to a personal computer and analyzed using ANADAT software program. Respiratory, airway and tissue viscoelastic pressure were calculated. Statistical analysis was done by ANOVA and statistical significance was defined as P <0.05. RESULTS: Group M and MP showed significantly increased airway pressures compared with group C (P <0.05), but there was no difference among the groups in terms of viscoelastic pressure. Arterial blood gas analysis showed that group P and MP had lower arterial partial oxygen pressures than group C (P <0.05). CONCLUSIONS: This study demonstrates that the intratracheal administration of PFC in a bronchoconstriction cat model increases airway pressure more than tissue viscoelastic pressure, and decreased arterial oxygen partial pressure. We conclude that the intratrachel administration of PFC is not to be recommended in bronchoconstrictive situations.
Airway Resistance ; Animals ; Blood Gas Analysis ; Blood Pressure ; Bronchoconstriction* ; Cats* ; Natural Resources ; Heart Rate ; Humans ; Liquid Ventilation ; Lung ; Male ; Mechanics ; Methacholine Chloride ; Microcomputers ; Oxygen ; Partial Pressure ; Pulmonary Gas Exchange* ; Respiratory Distress Syndrome, Adult ; Respiratory Mechanics* ; Surface Tension

With the increasing use of synthetic chemical based products in building construction in recent decades, there has been growing concern over the health hazards to firefighters and fire exposers from the inhalation of the toxic components of smoke. Toxic combustion products can have profound effects on the respiratory system, causing symptoms, physiologic changes, and chronic diseases. Prompt evaluation is important and should include chest films, pulmonary function testing, arterial blood gas analysis, and bronchoscopy. Positive findings require aggressive management with adequate oxygenation, ventilation, pulmonary toilet, and fluid resuscitation. Clinicians caring for individuals who have sustained inhalation damage to their respiratory tract need to comprehensively understand the mechanisms, natural history, management, and prevention of acute inhalation injury, so that they can help individual patients recover without serious complications.
Blood Gas Analysis ; Bronchoscopy ; Chronic Disease ; Firefighters ; Fires ; Hazardous Substances ; Humans ; Inhalation ; Lung Injury ; Natural History ; Oxygen ; Pulmonary Ventilation ; Respiratory Function Tests ; Respiratory System ; Resuscitation ; Smoke ; Thorax

PURPOSE: During August 2010, a natural gas fuel cylinder on a bus exploded in downtown Seoul, injuring 20 citizens. This kind of blast injury has never been reported in Korea before. Thus, the goal of this study was to review the clinical features of these victims to help physicians manage similar cases and to understand the risk factors associated with blast injuries in everyday life. METHODS: Twenty (20) victims who visited nearby emergency departments, and 3 peoples left hospital without care. Seventeen (17) victims were included in this study, and the following factors were investigated: age, sex, type of hospital, diagnosis of injury, injury mechanism, position of victim (in-bus/out of bus), classification of injury severity with START (simple triage and rapid treatment), and classification of injury according to the mechanism of the blast injury. RESULTS: The victims included 8 males (47%), 9 females (53%). The mean age was 37.5+/-12. Thirteen (13) victims were transferred to two tertiary hospitals, and 4 were transferred to two secondary hospitals. The types of injury were 3 fractures, 2 ligaments injuries, 6 contusions, 4 abrasions, and 3 open wounds (one of them was combined fracture). According to START classification, 17 victims were 1 immediate, 11 minor, 5 delayed, and no death. Classifications according to the mechanism of the blast injury were 1 primary injury, 6 secondary injuries (2 of them combined other mechanism), 3 tertiary injuries and 9 quaternary injuries. CONCLUSION: Trauma care physicians should be familiar with not only the specific types of injuries from blast accidents, but also the potential accidents that may occur in public facilities.
Blast Injuries ; Contusions ; Emergencies ; Explosions ; Female ; Gas, Natural ; Humans ; Korea ; Ligaments ; Male ; Multiple Trauma ; Public Facilities ; Risk Factors ; Tertiary Care Centers ; Triage

Although crystalloid solutions such as Ringer's lactate have become the standard for initial volume replacement after hemorrhage, it is controversy whether this fluid alone restores and maintains the depressed physiologic function after severe hemorrhage. Six anesthetized dogs were bled(35ml/kg) and resuscitated with Ringers lactate solution (100 ml/kg). Physiologic variables are measured initialy, after hemorrhage, after resucitation. Compared with initial value, after resuscitation data show marked reduction in hemoglobin, oxygen carrying capacity, vascular resistance, and electrolyte. But cardiac output and blood gas analysis data was not changed. Prothrombin time and partial thromboplastin time was prolongated. From this study crystalloid resuscitation in severe hemorrhagic shock restore cardiac output and perfusion, but fail to maintain adequate oxygen carrying capacity.
Animals ; Blood Gas Analysis ; Cardiac Output ; Natural Resources ; Dogs* ; Hemorrhage ; Lactic Acid ; Oxygen ; Partial Thromboplastin Time ; Perfusion ; Prothrombin Time ; Resuscitation* ; Shock, Hemorrhagic* ; Vascular Resistance

To decrease homologous transfusion and bleeding, hemodilution may be combined with in- duced hypotension. The effects of the above method on hemodynamics and oxygen carrying capacity in human is not studied. Ten patients, age 16-62 yr, having posterior spinal fusion, were studied. Acute preoperative hemodilution to hematocrit 27% with infusion of 10% pentastarch was performed in the patients. After induction of anesthesia and positioning we deereased mean arterial pressure to around 55mmHg by isoflurane and sodium nitroprusside. We observed the changes of hemodynamics and oxygen carrying capacity before hemodilution, after hemodilution, after induced hypotension and before the end of operation. After hemodilution, heart rate and arterial pressure were not changed significantly. Cardiac output and central venous pressure increased significantly. Systemic vascular resistance decreased significantly. There were no significant changes in arterial and mixed venous blood gas analysis. Oxygen flux was not changed significantly. Oxygen consumption and oxygen extraction ratio increased significantly but remained within normal range. After induced hypotension, heart rate was not changed. Cardiac output became lower than that after hemodilution, but was not different from the preoperative value. Systemic vascular resistance became lower than the preoperative value. There were no significant changes in arterial and mixed venous blood gas analysis except for mixed venous blood oxygen saturation. The mixed blood oxygen saturation increased to the preoperative level. Oxygen flux decreased, but oxygen consumption and oxygen extraction ratio were not significantly different from the preoperative values. There were no clinically significant changes in hemodynamics and oxygen carrying capacity before the end of operation. By the above results, we concluded that the combined use of hemodilution and induced hypotension is safe in the aspect of hemodynamics and oxygen carrying capacity.
Anesthesia ; Arterial Pressure ; Blood Gas Analysis ; Cardiac Output ; Central Venous Pressure ; Natural Resources* ; Heart Rate ; Hematocrit ; Hemodilution* ; Hemodynamics* ; Hemorrhage ; Humans ; Hydroxyethyl Starch Derivatives ; Hypotension* ; Isoflurane ; Nitroprusside ; Oxygen Consumption ; Oxygen* ; Reference Values ; Spinal Fusion* ; Vascular Resistance

OBJECTIVE: To analyze the case characteristics of poisoning by exhaust gas of the imperfect combustion of natural gas and provide references for forensic identification and prevention of such accidents. METHODS: Twenty-two cases of poisoning by exhaust gas of the imperfect combustion of natural gas in Minhang District during 2004 to 2013 were collected. Some aspects such as general conditions of deaths, incidence time, weather, field investigation, and autopsy were retrospectively analyzed. RESULTS: In the 22 cases, there were 15 males and 16 females. The age range was between 2 and 82 years old. The major occurring time was in January or February (8 cases in each) and the cases almost occurred in small area room (21 cases). There was wide crack next to the exhaust port when the gas water heater was been used in all cases. CONCLUSION There are more prone to occurrence of exhaust gas poisoning of imperfect combustion of natural gas in small area room with a ventilation window near the exhaust port of gas water heated. It shows that the scene of combustion exhaust gas poisoning should be more concerned in the cold season.
Accident Prevention ; Adolescent ; Adult ; Aged ; Aged, 80 and over ; Autopsy ; Carbon Monoxide Poisoning/prevention & control* ; Child ; Child, Preschool ; Death ; Female ; Humans ; Male ; Middle Aged ; Natural Gas/poisoning* ; Retrospective Studies ; Young Adult