当心血管搏动微弱甚至使用体外循环时，脉搏血氧计已无读数，但组织血氧参数无损监测仪仍能提供信息。
When the cardiovascular pulsation is weak even under cardiopulmonary bypass (CPB), pulse oxygen saturation at finger tip cannot be detected, but tissue oxygenation still can be monitored by NIRS.
当心血管搏动微弱甚至使用体外循环时，脉搏血氧计已无读数，但组织血氧参数无损监测仪仍能提供信息。
When the cardiovascular pulsation is weak even under cardiopulmonary bypass (CPB), pulse oxygen saturation at finger tip cannot be detected, but tissue oxygenation still can be monitored by NIRS.
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