I have just been diagnosed with severe central sleep apnea - idiopathic. Is this likely to lead to sudden death or will treatment options markedly i'?

No. Sudden death usually will happen with infants. Sleep apnea can be treated with increased o2 by using a CPAP or an oral appliance. You will be fine.
Improved Health . You are on the road to improving your health and minimizing risks for life shortening factors. Carefully consider the treatment recommendations for your particular condition and definitely implement them completely. In no time you will feel the difference in improved energy and strength and be well on your way to the vibrant life you have been waiting for!