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PubMed2006

The identification of the emulsifier component of emulsion explosives by liquid chromatography-mass spectrometry.

The widespread availability of emulsion explosives for commercial blasting has inevitably lead to their diversion for criminal misuse. Present techniques for the characterization of emulsion explosives and their residues is generally based on the detection and identification of the oxidizer and the hydrocarbon components. Use of these components is problematic for residue identification because ammonium nitrate, waxes, and oils are relatively common in the urban environment and even their co-detection does not exclude them being sourced from materials other than explosives. The detection of the emulsifier component offers increased evidential value as certain emulsifiers used in explosive formulations are manufactured for that specific use, or have limited environmental distribution. In the current study liquid chromatography-mass spectrometry (LC-MS) was utilized for the characterization of two emulsifiers in common use; ethanolamine adducts of polyisobutylene succinic anhydride and sorbitol mono-oleate (SMO). The LC-MS technique enabled the detection of both emulsifiers in preblast samples; however, only SMO was detected in postblast residues. The analysis of the hydrocarbon component by gas chromatography-mass spectrometry was achieved in the same procedure.

Journal Article↗
PubMed2002

A classical nova, V2487 Oph 1998, seen in x-rays before and after its explosion.

Classical nova explosions are very energetic and frequent phenomena caused by explosive hydrogen burning on top of an accreting white dwarf. Observations of the recent nova V2487 Oph 1998 by the X-ray Multi-Mirror satellite (XMM-Newton) provide evidence that accretion (probably on a magnetic white dwarf) was reestablished as early as 2.7 years after the explosion. In addition, positional correlation with a source previously discovered by the Röntgen Satellite (ROSAT) in 1990 suggests that the site of a nova explosion had been seen in x-rays before the outburst.

Journal Article↗
PubMed2003

Bladder explosion during transurethral resection of the prostate.

A case of bladder explosion with wide rupture during transurethral resection of the prostate (TURP) is reported. Immediate cystography was performed and the patient was promptly operated; the postoperative course was uneventful. Intravesical explosion is caused by explosive gas formation and the more dangerous combination is the mixture of air and hydrogen; therefore, the introduction of air during TURP is necessary in order to produce a bladder explosion. This unusual complication of a common urological procedure is rare but serious, and should it arise always requires immediate surgical correction.

Aged↗
PubMed2006

Intravesical Explosion during Transurethral Resection of Prostate - a reminder.

Intravesical explosion during transurethral resection of the prostate (TURP) is an extremely rare but dreaded complication and results in rupture of the bladder. It is believed that intravesical explosion occurs due to formation of explosive gases in the bladder during TURP and its admixture with air. A case of intravesical explosion during TURP resulting in bladder rupture at our institution is described. Though the management of this catastrophe is relatively straightforward, it has the potential for dire consequences. We emphasize that, despite its rare occurrence, it is preventable and suggest measures to avoid it.

Humans↗
PubMed2000

Examination of force-production properties during static explosive grip based on force-time curve parameters.

The present study attempts to clarify the properties of force-time curves in the force-development phase during static explosive grip exertion and to determine force-time parameters in relation to static explosive strength. 80 healthy young males (age 17.8 +/- 2.5 yr.) exerted maximal isometric force as fast and forcefully as possible. In total, 21 variables, e.g., time to fixed level, integrated area, average force, integrated area to fixed time, force at the maximal rate of force development, and maximal rate of force development, were selected as force-time parameters. Good reliability was obtained for average force in force levels above 90% of maximal strength (.64-.93), integrated area to a fixed time of 1.0-2.0 sec. (.86-.93), force at the maximal rate of force development (.67), and maximal rate of force development (.73). In addition, these values correlated closely with maximal grip strength (r= .65-.93). Further, significant differences in maximal grip strength, average force in force levels above 90% of maximal strength, integrated area to fixed time, and force at the maximal rate of force development were found among three groups categorized by average force in force levels of maximal strength. These results suggested that individual differences were present in the force-time curve patterns during the force-development phase of static explosive grip exertion and that the average force in force levels of maximal strength might be a valuable tool for evaluating static explosive strength.

Adolescent↗
PubMed1998

Ocular explosion during cataract surgery: a clinical, histopathological, experimental, and biophysical study.

INTRODUCTION: An increasing number of cases are being recognized in which a peribulbar anesthetic for cataract surgery has been inadvertently injected directly into the globe under high pressure until the globe ruptures or explodes. We reviewed the records of 6 such cases (one of which was reported previously by us), and one additional case has been reported in the literature. Surprisingly, 2 of these 7 cases went unrecognized at the time, and the surgeons proceeded with the cataract operation; all of the patients ultimately developed severe visual loss and/or loss of the eye. OBJECTIVES: To reproduce this eye explosion in a live anesthetized rabbit model and to perform a clinical, histopathological, experimental, biophysical, and mathematical analysis of this injury. METHODS: Eyes of live anesthetized rabbits were ruptured by means of the injection of saline directly into the globe under high pressure. The clinical and pathological findings of the ruptured human and animal eyes were documented photographically and/or histopathologically. An experimental, biophysical, and mathematical analysis of the pressures and forces required to rupture the globe via direct injection using human cadavers, human eye-bank eyes, and classic physics and ophthalmic formulas was performed. The laws of Bernoulli, LaPlace, Friedenwald, and Pascal were applied to the theoretical and experimental models of this phenomenon. RESULTS: The clinical and pathological findings of scleral rupture, retinal detachment, vitreous hemorrhage, and lens extrusion were observed. In the exploded human and rabbit eyes, the scleral ruptures appeared at the equator, the limbal area, or the posterior pole. In 2 of the 7 human eyes, the anterior segments appeared entirely normal despite the rupture, and cataract surgery was completed; surgery was canceled in the other 4 cases. In 4 of the 5 injected and ruptured rabbit eyes, the anterior segments appeared essentially normal. The experiments with human eye-bank eyes and the theoretical analyses of this entity show that the pressure required to produce such an injury is much more easily obtained with a 3- or 5-mL syringe than with a syringe 10 mL or larger. CONCLUSIONS: Explosion of an eyeball during the injection of anesthesia for ocular surgery is a devastating injury that may go unrecognized. The probability of an ocular explosion can be minimized by careful use of a syringe 10 mL or larger with a blunt needle, by discontinuing the injection if resistance is met, and by inspecting the globe prior to ocular massage or placement of a Honan balloon. When ocular explosion occurs, immediate referral to and intervention by a vitreoretinal surgeon is optimal. Practicing ophthalmologists should be aware of this blinding but preventable complication of ocular surgery.

Aged↗
PubMed2001

Detection limits for GC/MS analysis of organic explosives.

Method detection limits are determined and compared for analysis of liquid injections of organic explosives and related compounds by gas chromatography-mass spectroscopy utilizing electron impact (EI), negative ion chemical ionization (NICI), and positive ion chemical ionization (PICI) detection methods. Detection limits were rigorously determined for a series of dinitrotoluenes, trinitrotoluene, two nitroester explosives, and one nitramine explosive. The detection limits are lower by NICI than by EI or PICI for all explosives examined, with the exception of RDX. The lowest detection limit for RDX was achieved in the PICI ionization mode. Judicious choice of the appropriate ionization mode can enhance selectivity and significantly lower detection limits. Major ions are reported for each analyte in EI, PICI, and NICI detection modes.

Journal Article↗
PubMed2001

[Clinical and statistical patterns of the hearing system lesions caused by explosive mine trauma].

Mine-explosive trauma has become the predominant type of pathology in the structure of surgical sanitary losses. In 70-75% of the cases it is combined with acoustic injury that requires the improvement of diagnosis and prediction of acoustic injuries at the stage of qualified medical care. In 772 casualties with mine-explosive trauma admitted to the different departments of Kabul Central Hospital the conditions of explosive injury were identified and statistical analysis of acoustic injury dependence on the above-mentioned conditions was conducted. The quantitative patterns obtained could be used in prognosis of the possible value and structure of acoubarotraumatic losses in the mine-explosive injuries.

Adult↗
PubMed2000

Rabbit lung injury induced by explosive decompression.

OBJECTIVE: To study the mechanism of rabbit lung injury caused by explosive decompression. METHODS: A total of 42 rabbits and 10 rats were served as the experimental animals. A slow recompression-decompression test and an explosive decompression test were applied to the animals, respectively. And the effects of the given tests on the animals were discussed. RESULTS: The slow recompression-decompression did not cause an obvious lung injury, but the explosive decompression did cause lung injuries in different degrees. The greater the decompression range was, the shorter the decompression duration was, and the heavier the lung injuries were. CONCLUSIONS: Explosive decompression can cause a similar lung injury as shock wave does. The primary mechanical causes of the lung injury might be a tensile strain or stress in the alveolar wall and the pulmonary surface's impacts on the inside wall of the chest.

Journal Article↗
PubMed2002

Toxicity of the explosives 2,4,6-trinitrotoluene, hexahydro-1,3,5-trinitro-1,3,5-triazine, and octahydro-1,3,5,7-tetranitro-1,3,5,7-tetrazocine in sediments to Chironomus tentans and Hyalella azteca: low-dose hormesis and high-dose mortality.

The toxicity of the explosives 2,4,6-trinitrotoluene (TNT); hexahydro-1,3,5-trinitro-1,3,5-triazine (royal demolition explosive [RDX]); and octahydro-1,3,5,7-tetranitro-1,3,5,7-tetrazocine (high-melting explosive [HMX]), was evaluated in spiked sediment with two freshwater invertebrates. The midge Chironomus tentans and the amphipod Hyalella azteca demonstrated significant toxic effects after exposure to TNT and its degradation products, 1,3,5-trinitrobenzene (TNB) and 2,4-diamino-6-nitrotoluene (2,4-DANT). Significant reductions in survival of C. tentans exposed to TNT, TNB, and 2,4-DANT were observed at nominal sediment concentrations as low as 200 mg/kg. Hyalella azteca was more sensitive to TNT, TNB, and 2,4-DANT than the midge, where significant reductions in survival were observed at nominal concentrations of 50, 100, and 200 mg/kg, respectively. Survival of the midge and the amphipod was unaffected after exposure to RDX or HMX at the highest concentrations of 1,000 and 400 mg/kg, respectively. Growth of the midge, measured as total weight, was significantly reduced by 2,4-DANT. However, significantly increased growth was observed after exposure to sublethal concentrations of RDX and HMX. Although significant reductions in amphipod survival were observed at high concentrations of TNB, growth was significantly increased at sublethal concentrations. The results of the current investigation suggest that organisms exposed to explosives at contaminated sites may be affected at concentrations less than 25 mg/kg through hormetic growth enhancement and at higher concentrations through increased mortality.

Amphipoda↗
PubMed2002

Evaluation of community based intervention for the protection of children from small arms and explosive devices during the war: observational study.

AIM: To evaluate the influence of a community-based intervention aimed at reducing the risk of unintentional injuries caused by small arms and explosive devices accessible to children during the 1991-1995 war in Croatia. METHOD: From May 5 to June 15 in 1994 and 1995, we performed a cross-sectional survey on exposure of the children in Croatia to different small arms and explosive devices, using specially prepared questionnaires. The survey was conducted in Dubrovnik-Neretva and Karlovac counties, where community-based intervention was carried out, and Lika-Senj and Sisak-Moslavina counties, where only national intervention was implemented. The sample included a total of 5,317 parents and 2,581 children. The response rate was 98%. All participants were asked to give answers according to current situation. RESULTS: Approximately a third of children in the counties without community-based intervention and a fifth in the counties with community-based intervention could access small arms and explosive devices at home. Boys were more exposed than girls (p=0.001). In the communities with community-based intervention, children were less exposed to the devices, such as small-arms, hand grenades, and explosives, which were the main cause of injuries. In 1994, parents in counties without community-based intervention handled weapons in front of their children in 45% cases vs 31% of those in the counties with community-based intervention (p<0.001). In 1995, the percentages were 44 and 32, respectively (p<0.001). CONCLUSION: Although it is impossible to quantify the exact amount of risk reduction due to health intervention alone, community-based intervention reduced the exposure of children to weapons.

Adolescent↗
PubMed1989

Analysis of 828 servicemen killed or injured by explosion in Northern Ireland 1970-84: the Hostile Action Casualty System.

Death and injury due to terrorist bombings continue to exercise civilian and military surgeons alike. In this paper 828 servicemen killed and injured by explosions in Northern Ireland have been studied, using data stored in the Hostile Action Casualty System (HACS). Because of the nature of the conflict in Northern Ireland, the magnitude of each explosion and the distance of the victims from it are quite accurately known. The overpressure (blast loading) to which the victim was exposed can be estimated from the information on the HACS forms and standard tables, giving overpressures for a given change at a known distance. Using the HACS data, the numbers of injuries due to overpressure (primary blast injury), missiles energized by the blast (secondary injury), displacement of the victim by the blast wind (tertiary injury) and flash burn can be determined. Of the 828 servicemen involved in explosions, 216 were killed, most of them before any treatment could be instituted. Of the servicemen in the survey, 90 per cent were wearing body armour. Although body armour affords considerable protection from secondary missiles, it is unlikely to reduce the number of deaths due to primary blast injury.

Blast Injuries↗
PubMed2005

Evaluation of premorbid personality factors and pre-event posttraumatic stress symptoms in the development of posttraumatic stress symptoms associated with a bus explosion in Israel.

This study examined the role played by indicators of premorbid personality in the development of posttraumatic stress symptoms (PTSS). The initial sample consisted of 185 undergraduate students who had coincidentally been evaluated for their PTSS levels 2 weeks prior to a terrorist explosion. A week after the explosion, the sample was assessed to determine the extent of actual exposure. Of the initial 185 students, 81 reported being exposed and thus constituted the final cohort. They were reevaluated at 1 month after the explosion. Both assessments included personality and PTSS evaluation. Data analyses revealed five positive predictors of PTSS levels: high pre-attack PTSS levels, personal exposure, significant other's exposure, indirect exposure, and high premorbid levels on the harm avoidance personality dimension.

Adult↗
PubMed1994

Small bowel explosion: a complication of strictureplasty.

Explosion injury to the intestinal tract resulting from electrocautery is a rare occurrence. Only two small bowel explosions have been described previously. Here we describe an explosion of small bowel during strictureplasty in a patient with chronic obstructing Crohn's disease. Recommendations to avoid this disastrous complication include proximal decompression prior to incision and, in some cases, it may be wise to avoid electrocautery altogether.

Adult↗
PubMedDate not supplied

The relationship of blast loading to death and injury from explosion.

Death and injury from explosion are becoming ever more frequent. In this study an attempt is made to relate the blast loading suffered by individual victims of explosions to the injuries sustained. It includes 828 servicemen killed or injured by explosions in Northern Ireland. Two hundred sixteen servicemen were killed, most of them before any assistance could be rendered. In those exposed to a higher blast loading, blast lung was common. Those exposed to lower blast loading died primarily of head injuries. Body armour was worn by 90% of the servicemen and probably reduced the number of fatal secondary missile injuries.

Blast Injuries↗
PubMed1982

Whole-gut lavage for surgery. A case of intraoperative colonic explosion after administration of mannitol.

During the last few years, new forms of bowel preparation before surgery and operative endoscopy have been introduced as whole gut irrigation with saline or mannitol solutions. The use of 10 to 20 per cent mannitol solution is, however, likely to alter the composition and quantity of the colonic gases (methane and hydrogen) and to produce explosive mixtures. Some cases of fatal explosions occurring during endoscopic electroresection have been reported. The authors examine the whole gut lavage methods and report a case of colonic explosion during a left hemicolectomy on a patient prepared with 20 per cent mannitol solution.

Aged↗
PubMed2006

Successful management of esophageal perforation diagnosed 3 days after injury caused by an explosion in the workplace: report of a case.

We report a case of esophageal perforation caused by an explosion, but which was not diagnosed until 3 days after the injury. A 53-year-old worker sustained superficial dermal burns to his trachea, face, neck, and legs during an explosion. The burns were treated conservatively at a local hospital, but he was transferred to our hospital 3 days after the injury, when mediastinal emphysema and bilateral pleural effusion became evident. An esophagogram followed by computed tomography showed an esophageal perforation caused by the blast injury, and we performed an esophagectomy with recontruction of the gastric tube. After the operation, an X-ray showed a foreign body in the lower abdomen, which we found in the upper thoracic esophagus on the day of injury. We surmised that the patient had inadvertently swallowed a foreign body, which had been heated and scattered by the explosion, and it had melted the upper thoracic esophagus.

Blast Injuries↗
PubMedDate not supplied

Injuries caused by home-made explosives.

Eighty-six cases of injuries caused by home-made unconventional explosives were studied. The use of this type of explosive is common in India, Sri Lanka and other Eastern countries. Injuries are due to the blast effect, shrapnel and flash. The blast effect is seen only when the explosion occurs at close range. Accidental injuries to handlers and manufacturers conform to a particular pattern.

Blast Injuries↗