Clinical and operative details of the monitored patients with preoperative and postoperative hearing results

Patient No		Tumour type		Size (cm)			Audiogram
							Preoperative		Postoperative
							dB	SD%	dB	SD%
1	AN	<2.5	drilling	70	NA	120	NA	No
2	CPA	>2.5	drilling, tumour handling	NA	NA	NA	NA	No
3	AN	<2.5	drilling, tumour handling	40	NA	95	NA	Yes
4	AN	<2.5	drilling, tumour handling	40	NA	NA	NA	No
5	AN	>2.5	nerve section	40	NA	NA	NA	No
6	AN	<2.5	drilling	50	100	55	60	Yes
7	AN	>2.5	drilling, tumour handling	20	NA	NA	NA	No
8	AN	<2.5	Tumour handling	50	NA	NA	NA	No
9	CPA	>2.5	drilling	30	NA	30	NA	Yes^*
10	AN	<2.5	diathermy, tmr handling	30	NA	NA	NA	No
11	CPA	>2.5	no major change	20	NA	20	NA	Yes^*
12	CPA	>2.5	Tumour handling, hypotension	10	NA	10	NA	Yes^*
13	AN	<2.5	drilling, tumour enucleation	30	100	30	95	Yes^*
14	AN	<2.5	Tumour handling	20	90	20	90	Yes^*
15	AN	<2.5	nerve section	20	NA	—	—	No
16	AN	>2.5	no major change	30	NA	NA	NA	Yes
17	AN	<2.5	no major change	55	NA	55	NA	Yes
18	AN	<2.5	Vasospasm	30	100	60	NA	Yes
19	AN	<2.5	nerve section	60	100	—	—	No
20	AN	<2.5	Tumour handling	45	NA	60	NA	Yes
21	AN	<2.5	drilling	30	100	40	100	Yes^*
22	AN	<2.5	drilling	30	100	40	100	Yes^*

AN = Acoustic neuroma; CPA =cerebellopontine angle tumour; NA = not available; dB = hearing level in decibels at 1000 Hz; SD = percentage of spoken words recognised; ^*Useful hearing.