Green urine: A cause for concern?

128 Journal of Anaesthesiology Clinical Pharmacology | Volume 33 | Issue 1 | January-March 2017 with objects such as oral preoperative medication, prefilled epinephrine syringe, plastic wrapping from a filter, a heat and moisture exchanger, mucus, and an inferior turbinate, or herniation of the cuff have occurred but are all rare events.[5] This is an unusual case of ETT obstruction by tubercular granulation tissue, either an endobronchial focus or a tubercular lymph node eroding through the bronchus. However, in either case, this was asymptomatic and could not be picked up during preanesthetic evaluation. Lin et al. reported a case of acute ETT obstruction caused by unexpected hemoptysis in a patient undergoing surgery for Pott’s spine in prone position, which was relieved just by placing the patient supine (as happened in our case as well).[6] Further, FOB not only has a role in diagnosis of an adverse respiratory event in an intubated patient but also is a useful therapeutic tool as well.[5] An algorithm for the management of airway obstruction is to exclude ventilator, circuit, and ETT as causes step by step followed by considering and treating patient sources of resistance.[7]