初产妇，妊娠41周，下腹阵痛9小时。入 院查为LOA，已人盆，胎心168次/分，子 宫处于持续紧张状态，间歇期不放松，产妇 呼痛不已。阴道检査：宫口开lcm，S=0, 观察2小时，产程无进展。初步诊断为(       )

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