CLINICAL INTRODUCTION A 46-year-old man was brought to the ED after being found in an enclosed sauna minimally responsive, clammy and confused. On arrival he was alert, smiling and recalled sniffing a ‘herbal’ bottle followed by nausea, dizziness, poor balance, inability to stand up, shortness of breath, palpitations, sweating and confusion. He had a past history of back pain. He had blue-purpl...