Can you explain the block and replace approach in the treatment of thyrotoxicosis, including when it is most appropriate to use and how it compares to other treatment options?

In which clinical scenarios would you use the block and replace method for treating thyrotoxicosis?

• A patient with severe thyroid eye disease
• A patient with both stimulatory and blocking auto antibodies whose thyroid function tests are difficult to control
• Any patient with Graves' disease as this method has shown higher remission rates
• Other