ABSTRACT
According to the class of hypovolaemic shock, a blood loss less than 750 ml is not associated with the physiological changes. As a result it may cause a delay in fluid resuscitation. We postulate inferior vena cava (IVC) diameter reduction in inspiration and expiration may resemble the significant volume of blood loss in a healthy adult. We conducted a study to examine the changes of the IVC diameter pre and post blood donation.The inferior vena cava diameter during inspiration (IVCi) and expiration (IVCe) were measured using ultrasound (GE HEALTH) in supine position before and after blood donation of 450 ml. Paired t-test and Wilcoxin rank test were used to analyse the data. Forty two blood donors enrolled during the study period. The mean age of blood donors was 32.3 +/- 8.9 and mainly male blood donors. The mean IVCe of pre and post blood donation was 18.5 +/- 6.2 mm (95%CI 18.23, 18.74) and 16.6 +/- 6.6 mm (95%CI 16.35, 16.76) respectively. Meanwhile, the mean IVCi of pre and post blood donation was 17.1 +/- 8.6 mm (95%CI 16.89,17.30) and 15.6 +/- 6.6 mm (95%CI 15.43,15.81) respectively. The mean difference of IVCe pre and post blood donation was 1.9 +/- 0.5 mm (95%CI 1.75, 2.13) (p<0.001). In contrast, the mean difference of IVCi pre and post blood donation was 1.5 +/- 0.5 mm (95%CI 1.34, 1.68) (p<0.001). As a conclusion, the measurement of IVC diameter by ultrasound can predict the volume of blood loss in simulated type 1 hypovolaemia patient.
ABSTRACT
Mediastinal mature cycstic teratomas are rare germ cell tumors most commonly found in the anterior mediastinum, and constitute about 3-12% of all mediastinal tumors. They growslowly and are usually diagnosed incidentally. This is a rare presentation of a young lady with mediastinalmature cystic teratoma (dermoid cyst) presenting with chronic cough and haemoptysis.
ABSTRACT
Determining the degree of conformity of respirator cartridges with the accepted standards is very important for ensuring their respiratory protection efficiency. The aim of this study was to determine the degree of conformity of organic vapor-respirator cartridges used in different petrochemical companies with the EN 14387:2004 standard. In the first phase of the study, the respirator cartridges used in petrochemical complexes were identified and their specifications obtained from their manufacturers and the relevant technical catalogues. In the second phase, 3 samples of each of the cartridge models were chosen and tested according to the EN 14387:2004 standard. An instrument was especially designed for measuring the breakthrough time of the cartridges. The results showed that the minimum and maximum breakthrough times of cartridges were 29 and 142 minutes, respectively. From all the 10 different cartridge models tested, one had a service life of lower than the minimum standard breakthrough time of 70 minutes. Considering the existence of a non-standard type of cartridge among the samples studied, it is essential to launch a program aiming at ensuring the conformity of cartridge efficiency with the respective standards. Such a program should be developed and implemented by such responsible organizations as the Institute of Standard and Industrial Research of Iran and the Center for Occupational Health and Safety Research and Training of Iran