Hazards associated with blue light emitted during gas metal arc welding of mild steel using various shielding gases and currents.

Blue light emitted during arc welding is known to potentially cause photoretinopathy. To help prevent retinal injury, it is important to identify the hazards associated with various welding conditions. The present work conducted experiments involving gas metal arc welding of mild steel under various conditions, and measured the spectral radiance of the arcs.

Different pharmacoresistance of focal epileptic spasms, generalized epileptic spasms, and generalized epileptic spasms combined with focal seizures.

Objective: Among standard treatments for infantile spasms, adrenocorticotropic hormone (ACTH) is reported as the best treatment, but ACTH is ineffective in one-half of the patients. To establish precision medicine, we examined pharmacoresistance of focal epileptic spasms (ES), generalized ES, and generalized ES combined with focal seizures, diagnosed based on the revised seizure classification of ILAE in 2017.

Methods: We conducted a retrospective nationwide study in Japan on the long-term seizure outcome of ES.

Fume particle size distribution and fume generation rate during arc welding of cast iron.

This study measured the fume particle size distribution and fume generation rate during arc welding of cast iron and estimated the generation rate of respirable dust. In addition, the generation rate of particles with a diameter of 0.3 µm or less was estimated.

Comprehensive analysis of hazard of ultraviolet radiation emitted during arc welding of cast iron.

Objectives: Ultraviolet radiation (UVR) emitted during arc welding frequently causes keratoconjunctivitis and skin erythema. The extent of the hazard of UVR varies depending on the welding process and conditions. Therefore, it is important to identify the levels of UVR present under different conditions.

Blue-Light Hazard From Gas Metal Arc Welding of Aluminum Alloys.

Objectives: The objective was to quantify the blue-light hazard from gas metal arc welding (GMAW) of aluminum alloys. The exposure level is expected to depend on the welding conditions. Therefore, it is important to identify the blue-light hazard under various welding conditions.

Hazard of ultraviolet radiation emitted in gas metal arc welding of mild steel.

Objectives: Ultraviolet radiation (UVR) emitted during arc welding frequently causes keratoconjunctivitis and erythema in the workplace. The degree of hazard from UVR exposure depends on the welding method and conditions. Therefore, it is important to identify the UVR levels present under various conditions.

[A 5-year-old boy with nonconvulsive status epilepticus induced by theophylline treatment].

A normally developed 5-year-old boy with no history of convulsive disorder presented with a generalized tonic-clonic convulsion on the second day of oral theophylline therapy. Although the convulsive seizure was abolished by an intravenous bolus of diazepam, he did not regain consciousness. Emergency electroencephalography disclosed continuous irregular seizure activity, occurring predominantly over the right hemisphere, indicating a diagnosis of nonconvulsive status epilepticus (NCSE).