当出血情况严重且使视力严重下降，特别是当其持续时间超过3个月时则须要行玻离体切割术。
Vitrectomy may be indicated for severe hemorrhage and substantially diminished visual acuity, especially if it persists longer than 3 months.
出血轻微，但持续的时间很长。
目的为了减轻上颌窦根治术后病人出血、肿胀、疼痛程度及缩短其持续时间。
Objective to attenuate the swelling and pain and shorten the sustaining duration, and to decrease the blood loss of the patients undergoing maxillary sinus radical treatment.
结果A组平均住院日及手术持续时间均较短，出血量少，费用低。
Results The patients in the Group A had less blood loss, spent less and needed shorter hospitalization and operative duration.
结果A组平均住院日及手术持续时间均较短，出血量少，费用低。
Results The patients in the Group A had less blood loss, spent less and needed shorter hospitalization and operative duration.
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