You are considering procedural sedation for a patient with vascular compromise due to a fracture They ate a meal two hours ago You are trying to remember the factors that affect gastric emptytng in healthy patients What factor will delay gastric emptying?

A 15 year old girl with sickle cell anaemia attends with left leg swelling and pain Further investigations suggest a diagnosis of osteomyelitis of her tibia.
What is the most likely causative organism?

A 24 year old woman is admitted to your observation ward with a sudden onset headache. Her CT showed no abnormality and you decide to perform a lumbar puncture What is the next structure the needle will puncture after going through the skin and subcutaneous fat?

A 48 year old man presents to the ED with sudden onset, severe abdominal pain His CT shows pneumoretroperitoneum. Which of these structures is most likely to have perforated?

An 80 year old woman presents to the ED with diarrhoea and vomiting. She is clinically dehydrated The physiological response to this involves release of antidiuretic hormone Where is this hormone most likely to be released from?