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According to an analysis of 138 hospitalized COVID-19 patients in Wuhan, 41% patients were highly suspicious of nosocomial infection (5). [...]this causes delay in treating life-threatening situations. [...]how to carry out necessary endoscopic procedures with both endoscopy staff and patients well protected is a question of high priority at the present. [...]although GI endoscopy is a “high-risk” procedure during COVID-19 pandemic, it is irrational to stop all endoscopic procedures.

Key Points Shows that cross infection control barriers can indirectly affect the cure of light-activated resin composite. Demonstrates that food wrap material is just as effective a barrier as some commercial products. Highlights that the effects of physical damage along with those of cross infection control measures should be considered clinically important. This study investigated the effects that disposable infection control barriers and physical damage through use had on the power output from dental light curing units (LCUs) and light curing tips (LCTs). Five disposable infection control barriers were tested on a number of LCUs and LCTs. Testing involved the repeated measurement of power output of LCUs and LCTs on a radiometer. Two of the barriers tested caused statistically significant reductions in the mean light output intensity when compared to the no barrier control groups. One barrier type reduced the power output by 30 to 40%. It was also noted that physical damage to the LCTs affected power output by between 20 and 30%, which was then further reduced by the disposable barrier. This study showed that three of the five disposable infection control barriers had little effect on the overall efficiency of the power output of the LCUs. It also showed that physical damage to LCUs and LCTs can affect power output significantly. Infection control measures should be carefully considered before use to avoid undue effects on power output delivered from the LCUs/LCTs to ensure that the degree of polymerisation within the resin-based composite and curing efficiency are not affected unduly.

Issue addressed: While it is difficult to promote the use of hearing protectors in noisy workplaces and leisure settings, some nightclub attendees choose to wear earplugs when exposed to loud music. This qualitative study investigated the perceptions of clubbers about the advantages and disadvantages of earplug use in nightclubs. Such first-hand information could potentially be used to educate non-wearers about the features of different earplug types, the experience of wearing earplugs and their relative merits. Methods: Structured telephone interviews were conducted with 20 regular clubbers who wear different types of earplugs at nightclubs. Participants were asked about their experience of wearing earplugs and, in particular, what they perceive to be the advantages and disadvantages of earplugs. Results: Participants' responses revealed that cheaper foam earplugs are considered less satisfactory than more expensive earplugs, which are relatively discreet and comfortable, facilitate communication with others, create minimal music distortion and, in some cases, improve music sound quality. In terms of effectiveness, all types of earplugs were considered beneficial in reducing the after-effects of loud music and providing hearing protection. Conclusions: The perceived advantages of earplugs, which are often not recognised by non-earplug wearers, should be communicated in order to encourage the use of earplugs among clubbers.

A combination of local flow measurement techniques and fog flow visualization was used to determine the inward leakage for two tight-fitting powered air-purifying respirators (PAPRs), the 3M Breathe-Easy PAPR and the SE 400 breathing demand PAPR. The PAPRs were mounted on a breathing machine head form, and flows were measured from the blower and into the breathing machine. Both respirators leaked a little at the beginning of inhalation, probably through their exhalation valves. In both cases, the leakage was not enough for fog to appear at the mouth of the head form.

This experiment was conducted to determine how much contaminant could be expected to be inhaled when overbreathing several different types of respirators. These included several tight-fitting and loose-fitting powered air-purifying respirators (PAPRs) and one air-purifying respirator (APR). CO(2) was used as a tracer gas in the ambient air, and several loose-and tight-fitting respirators were tested on the head form of a breathing machine. CO(2) concentration in the exhaled breath was monitored as well as CO(2) concentration in the ambient air. This concentration ratio was able to give a measurement of protection factor, not for the respirator necessarily, but for the wearer. Flow rates in the filter/blower inlet and breathing machine outlet were also monitored, so blower effectiveness (defined as the blower contribution to inhaled air) could also be determined. Wearer protection factors were found to range from 1.1 for the Racal AirMate loose-fitting PAPR to infinity for the 3M Hood, 3M Breath-Easy PAPR, and SE 400 breath-responsive PAPR. Inhaled contaminant volumes depended on tidal volume but ranged from 2.02  L to 0  L for the same respirators, respectively. Blower effectiveness was about 1.0 for tight-fitting APRs, 0.18 for the Racal, and greater than 1.0 for two of the loose-fitting PAPRs. With blower effectiveness greater than 1.0, some blower flow during the exhalation phase contributes to the subsequent inhalation. Results from this experiment point to different ways to measure respirator efficacy.

Many factors are considered during ballistic helmet design, including comfort, weight, fit, and maintainability. These factors affect soldiers' decisions about helmet use; therefore, rigorous research about soldiers' real-life experiences with helmets is critical to assessing a helmet's overall protective efficacy. This study compared soldiers' satisfaction and problem experience with the advanced combat helmet (ACH) and the personal armor system for ground troops (PASGT) helmet. Data were obtained from surveys of soldiers at Fort Bragg, North Carolina. Ninety percent of ACH users were satisfied overall with their helmet, but only 9.5% of PASGT users were satisfied (p < 0.001). The most frequently reported problems for the ACH involved malfunctioning helmet parts. The most frequently reported problems for the PASGT involved discomfort. This analysis indicated that there was a strong soldier preference for the ACH over the PASGT, which could enhance its already superior protective qualities. It also demonstrated the usefulness of soldiers' assessments of protective equipment.

This study compared the effectiveness of the ITT Night Vision Viewer with the Wide Angle Mobility Lamp (WAML) as low-vision mobility devices for people experiencing night blindness due to retinitis pigmentosa (RP). Both engineering bench testing and functional evaluations were used in the assessments. Engineering evaluations were conducted for (1) consistency of the manufacturer's specifications, (2) ergonomic characteristics, (3) modifications of devices, and (4) pedestrian safety issues. Twenty-seven patients with RP conducted rehabilitation evaluations with each device that included both clinical and functional tests. Both devices improved nighttime travel for people with night blindness as compared with nighttime travel with no device. Overall, the WAML provided better travel efficiency-equivalent to that measured in daytime. Recommendations have been developed on ergonomic factors for both devices. Although some participants preferred the ITT Night Vision Viewer, overall most participants performed better with the WAML.

The Food and Drug Administration (FDA) is classifying the filtering facepiece respirator for use by the general public in public health medical emergencies into class II (special controls). The agency is classifying these devices into class II (special controls) in order to provide a reasonable assurance of the safety and effectiveness of these devices and is specifying what those special controls are. Elsewhere in this issue of the Federal Register, FDA is announcing the availability of a guidance document entitled, \"Guidance for Industry and Food and Drug Administration Staff; Class II Special Controls Guidance Document: Filtering Facepiece Respirator for Use by the General Public in Public Health Medical Emergencies.\" This guidance document will serve as one of the special controls, along with certification of the respirator by the National Institute for Occupational Safety and Health (NIOSH) in accordance with its regulations for non-powered air-purifying particulate respirators, found in 42 CFR part 84, as specified in the classification regulation.

Every day, workers in many locales are injured because they did not wear adequate eye and face protection. Or because they wore inadequate protection, the result of being poorly trained or not trained at all. Eye and face protection is required in workplaces ranging from paint booths and car repair shops to foundries, welding operations, and chemical manufacturing. Experts say the injuries are almost entirely preventable through adequate training and proper protection. OSHA has published non-mandatory guidelines for assessing hazards and selecting eye and face protection. OSHA points out that care should be taken to recognize the possibility of multiple and simultaneous exposure to a variety of hazards. Adequate protection against the highest level of each of the hazards should be provided. Protective devices do not provide unlimited protection.