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Messina, Antonio; Colombo, Davide; Lionetti, Giulia; Calabrò, Lorenzo; Negri, Katerina; Robba, Chiara; Cammarota, Gianmaria; Costantini, Elena; Cecconi, Maurizio
Journal of clinical monitoring and computing, 04/2023, Volume: 37, Issue: 2Journal Article
In this study we evaluated the effect of fluid challenge (FC) administration in elective surgical patients with low or normal blood pressure. Secondarily, we appraised the pharmacodynamic effect of FC in normotensive and hypotensive patients. We assessed five merged datasets of patients with a baseline mean arterial pressure (MAP) above or below 65 mmHg and assessed the changes of systolic, diastolic, mean and dicrotic arterial pressures, dynamic indexes of fluid responsiveness and arterial elastance over a 10-min infusion. The hemodynamic effect was assessed by considering the net area under the curve (AUC), the maximal percentage difference from baseline (d max ), the time when the maximal value was observed (t max ) and change from baseline at 5-min (d 5 ) after FC end. A stroke volume index increase > 10% with respect to the baseline value after FC administration indicated fluid response. Two hundred-seventeen patients were analysed 102 (47.0%) fluid responders. On average, FC restored a MAP ≥ 65 mmHg after 5 min. The AUCs and the d max of pressure variables and arterial elastance of hypotensive patients were all significantly greater than normotensive patients. Pressure variables and arterial elastance changes in the hypotensive group were all significantly higher at d 5 as compared to the normotensive group. In hypotensive patients, FC restores a MAP ≥ 65 mmHg after 5 min from infusion start. The hemodynamic profile of FC in hypotensive and normotensive patients is different; both the magnitude of pressure augmentation and duration is greater in the hypotensive group.
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