昏迷時間因腎衰竭已到920度,及心絞痛

I guess the term "920度" mean creatinine level 920umol/l. For an elderly, this reading indicate renal failure (may be acute or chronic renal failure)
Heart disease like coronary heart disease and hypertensive heart disease commonly occur with those with chronic renal failure and may present with chest pain (心絞痛)
You need to know the causes of coma (昏迷). Based on the history you provided, it can be due to uremia (excessive accumulation of toxin that required kidney for clearance) but other causes cannot be excluded (eg stroke, heart attack)
More information will be required to answer your questions (eg whether this patient has any history of kidney disease/ heart disease/ stroke before and on this admission, any workup / investigations performed in hospital and their results)

到禁ge程度,其他因素已不重要,
能不能甦醒過來最重要就是他本人的求生意志力有多大而定啦