4th May 2025

A 50-year-old woman with a past medical history of schizophrenia and is on Olanzapine presents to ED with a few days of palpitations and near syncope.

A 50-year-old woman with a past medical history of schizophrenia and is on Olanzapine presents to ED with a few days of palpitations and near syncope. These palpitations last for a few minutes and because of this she feels faint.A systems review shows that she has a 2-day history of diarrhoea and vomiting. She also complains of breathlessness and a cough. She then gets treatment with IV fluids and oral Azithromycin.

2 days later in hospital, the nurses alert you as her blood pressure has now dropped to 100/65mmHg and her rate has increased to 140 bpm.

Her cardiac monitor shows a run of sustained polymorphic tachycardia.

What is the next best appropriate measure?

Select the SINGLE most appropriate option from the list below. Select ONE option only.