الفهرس 
Types of shift workOnly 14 pages are availabe for public view
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Abstract
This study is conducted on 400 workers employed in a gas field of a petroleum company in Dakahlia governorate (200-shift and 200-non shift workers).
The aim is to study the influence of pattern of shift work on coronary high risk status, comparing rates of coronary high-risk subjects among shift and non-shift workers, investigating possible risk variables among shift and non-shift workers and detecting predictors of CAD among shift workers.
The study was conducted during the period of May 2008 till April 2009 after getting approval from the concerned authorities and workers consent.
The study tools included: an interviewing questionnaire, clinical examination, laboratory analysis (fasting blood glucose, lipid profile, serum uric acid, complete blood picture, serum urea and creatinine, 24-hr urine sample was collected from a sub-sample of high risk cases (>2 CAD risk factors), 25 shift and 25 non-shift workers for determination of vanillyl mandelic acid (VMA) as a stress indicator.
In addition resting standardized 12 leads Electrocardiograph (ECG) was performed to all participants in the study, also R-R variability test on resting ECG was conducted to investigate cardiovascular autonomic function among the previously selected sub-sample. We exclude diabetics and any other diseases that may affect autonomic function.
The main results of the our study include:
• Shift workers were shown to be more stressed than non shift workers as indicated by low decision latitude, high job demands and type A personality behavior pattern.
• Symptoms which were significantly more reported among shift workers include chest pain, dyspnea, cold extremities, headache, dyspepsia and insomnia.
• Laboratory results showed significant abnormal values among shift workers including fasting blood sugar,serum cholesterol, triglycerides , HDL-C, LDL-C, and serum uric acid.
• Shift workers having 24-hr urinary vanillyl mandelic acid ≥10mg\day as stress indicator were significantly more than non shift workers.
• Shift workers showed positive R-R variability test indicating disturbance in cardiovascular autonomic function.
• The significant cardiovascular risk factors among shift workers were: smoking, hypertension, dyslipidaemia, obesity, physical inactivity and diabetes.
• Shift workers having more than 2 coronary risk factors and\or DM were significantly more than non shift workers.
• Diagnosis of coronary artery disease was significantly higher among shift than non shift workers.
• Multiple logistic regression analysis of Coronary High Risk Status (CHRS) as dependant variable in the studied group revealed that shift work was a significant independent factor.