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Methaemoglobin is a form of haemoglobin with oxidised ferric (+3) iron rather than ferrous (+2) iron, which causes a leftward shift in the oxyhaemoglobin dissociation curve and prevents oxygen delivery. Anaesthesiologists need to be familiar with this differential diagnosis for hypoxia given the use of drugs in the perioperative setting known to induce methaemoglobinaemia, including benzocaine and lidocaine, antibiotics such as dapsone and anaesthetic gases, including nitric oxide. This case report details an interesting case of symptomatic methaemoglobinaemia in the perioperative period in the setting of dapsone use and an erector spinae block performed with ropivacaine.

Attractive facial cues are preferred by most but, interestingly, people tend to find certain facial features more attractive depending on the context. This replication of Watkins and colleagues (2012) investigates how priming different social support conditions influences preferences for feminized or masculinized faces. In this study, 124 participants were recruited to complete an online survey where they were asked to imagine a time they felt socially isolated (low support condition) or a time they felt emotionally supported (high support condition). Participants were then shown 20 pairs of masculinized and feminized versions of the same face and were asked to rate attractiveness. Overall, feminine female faces and masculine male faces were significantly preferred. We did not replicate the finding that femininity is preferred under conditions of low social support. Future research is needed to make conclusions about how perceived social support influences our perception of faces.

Complex regional pain syndrome (CRPS) has the potential to spread from the initial site to distant areas of the body. However, there is a paucity of data reporting the patterns and underlying cause of the spread. This case describes spontaneous, ipsilateral spread of CRPS from the right lower extremity to the orbit, leading to corneal abrasion.

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