Introduction (168 words)Deep brain stimulation (DBS) is an effective minimally invasive therapeutic strategy for patients with severe movement disorders such as essential tremor, Parkinson’s disease, and dystonia. It is also beneficial in patients with refractory psychiatric conditions such as obsessive-compulsive disorder or Tourette’s syndrome (1). The procedure involves the stereotactic implantation of electrodes into specific deep brain structures, followed by the connection of subcutaneous wires to a stimulation device usually placed underneath the clavicle. While the implantation of electrodes can be completed under monitored anaesthesia care in most cases, tunnelling of wires requires general anaesthesia with tracheal intubation.The American Association of Neurological Surgeons (AANS) considers DBS to be a low-risk procedure (2–4). Indeed, while the perioperative mortality rate is below 1%, severe adverse surgical events such as intracranial haemorrhage or intracranial abscess are reported in 1-2% of cases. Cardiopulmonary instability is either very rare or underreported. Here, we present the case of a patient with severe Parkinson’s disease and pulmonary artery hypertension who suffered an intraoperative cardiac arrest.