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背景:临床场景中，腹腔高压对人体的影响依赖时间，尚不清楚时间因素所起作用。目的:研究腹腔高压持续时间对危重症患者预后的影响。方法:采用多中心前瞻性观察性研究方法，于2018年1月至2020年12月连续性纳入入住福建省10所三甲医院外科重症监护病房的腹腔高压(intra-abdominal hypertention, IAH)危重症患者256例，动态监测腹腔压力(intra-abdominal pressure, IAP)后获得IAH持续时间(duration of intra-abdominal hypertention, DIAH)，同时观察并记录机械通气时间、连续性肾脏替代治疗(continuous renal replacement therapy, CRRT)时间、ICU住院时间以及住ICU期间肠内营养(enteral nutrition, EN)日平均摄入能量，应用Spearman秩相关分析其相关性。根据被纳入研究后60 d的生存状态将患者分为存活组与死亡组，比较两组间临床特征差异，运用Logistic回归模型探索并验证DIAH对IAH危重症患者60 d死亡风险的影响。绘制受试者工作特征曲线(receiver operating characteristics curves, ROC曲线)，分析DIAH对死亡风险的预测价值。结果:DIAH与机械通气时间、CRRT时间及ICU住院时间均呈正相关关系，n r分别为0.679、0.541及0.794，与EN日平均摄入能量呈负相关关系，n r=-0.669，n P值均<0.001。多因素校正后，DIAH是与IAH危重症患者60 d死亡相关的独立危险因素(n OR 1.05, 95%n CI 1.01~1.12; n P = 0.012)，并且与死亡风险之间存在线性变化趋势。DIAH的ROC曲线分析显示，其曲线下面积（area under the curve, AUC）为0.825，[95%n CI(0.763~0.886)]，n P<0.001，当截断值为16.5 d时，灵敏度为78.4%，特异度为75.4%。n 结论:DIAH是影响危重症患者预后的危险因素，应尽早识别并快速干预IAH的病因，缩短DIAH。“,”Background:In the clinical setting, the effect of intra-abdominal hypertension on the human body is dependent on time, but its role is not yet clear.Objective:To investigate the effect of the duration of intra-abdominal hypertension (IAH) on the prognosis of critically ill patients.Methods:This prospective cohort study enrolled 256 IAH patients who were admitted to the Surgical ICU of 10 Grade A hospitals in Fujian Province from January 2018 to December 2020. The duration of IAH (DIAH) was obtained after monitoring IAP, and ICU length of stay, duration of mechanical ventilation, duration of continuous renal replacement therapy (CRRT) and average daily energy intake from enteral nutrition during ICU stay were observed and recorded. The correlation was analyzed by Spearman rank correlation. The patients were divided into the survival group and the death group according to their survival state at 60 days after enrollment. Thereafter, clinical characteristics between the two groups were compared. Multivariable logistic regression was used to study and validate the relationship between DIAH and 60-day mortality. The receiver operating characteristics (ROC) curve was established to evaluate the predictive abilities of DIAH on the mortality risk.Results:In critically ill patients, DIAH was positively correlated with duration of mechanical ventilation (n r=0.679, n P<0.001), duration of CRRT (n r=0.541, n P<0.001) and ICU length of stay (n r=0.794, n P<0.001), respectively. In addition, there was a negative correlation between DIAH and average daily energy intake from enteral nutrition (n r=-0.669, n P<0.001). After multivariable adjustment, DIAH was an independent risk factor for 60-day mortality in critically patients with IAH (n OR=1.05, 95% n CI: 1.01-1.12; n P = 0.012), and exhibited a linearity change trend relationship with mortality risk. The ROC curve analysis of DIAH showed that the area under ROC curve (AUC) was 0.825 (95% n CI: 0.763~0.886, n P<0.01). When the cut-off value was 16.5 days, the sensitivity was 78.4% and the specificity was 75.4%.n Conclusions:DIAH is an important risk factor for prognosis in critically ill patients. Early identification and rapid intervention for the etiology of IAH should be performed to shorten DIAH.