Facile synthesis and characterization of erbium oxide (Er2O3) nanospheres embellished on reduced graphene oxide nanomatrix for trace-level detection of a hazardous pollutant causing Methemoglobinaemia

The nanomaterials have received enormous attention in the catalysis applications. Particularly, we have focused on the fabrication of nanocomposite for an electrochemical sensor with improved electrocatalytic performance. Herein, a rapid and sensitive electrochemical detection of nitrite is essential for assessing the risks facing ecosystems in environment. We report a simple and robust ultrasonic-assisted synthetical route via prepared Er₂O₃ nanoparticles decorated reduced graphene oxide nanocomposite (Er₂O₃ NPs@RGO) modified electrode for nitrite detection. The composition and morphological formation were characterized by XRD, XPS, FESEM, and HRTEM. The amperometric (i-t) and cyclic voltammetry were exhibits tremendous electrocatalytic capability and superior performance toward nitrite oxidation. A sensitive and reproducible amperometric nitrite sensor was fabricated which able to detect trace concentration as 3.69 nM and excellent sensitivity (24.17 µA µM^-1 cm^-2). The method worked well even in cured meat and water samples and the results has indicates the reliability of the method in real-time analysis.

Methemoglobinemia treated with hyperbaric oxygen therapy: A case report

Methemoglobinemia is a rare but clinically important condition that should be considered among differential diagnosis' in cyanosis. The conventional treatments of methemoglobinemia are high flow oxygen and methylene blue therapies.

We present a 52-year-old male patient who admitted to emergency room with severe cyanosis and dyspnea after he was exposed to paint thinner and zinc phosphate solution. The patient was diagnosed with methemoglobinemia with a MetHb level of 49.1mm/Hg in his arterial blood gas test. Patient's symptoms and increased MetHb levels were resistant to high flow oxygen and methylene blue therapies so hyperbaric oxygen therapy (HBO) as an alternative treatment was initiated and the patient was cured promptly.

In this case presentation, we aim to discuss the alternative treatment modalities in methemoglobinemia patients with persistent hypoxia and cyanosis, who are unresponsive to standard methylene blue treatment.