- ICH GCP
- Registr klinických studií v USA
- Klinická studie NCT07617428
Clinical Validation of a Blood Loss Monitoring System
Prospective Multicenter Clinical Validation of a Novel Multifunctional Intraoperative Blood Loss Monitoring System
This observational study aims to evaluate the practicality of a novel multifunctional intraoperative blood loss monitoring system in real-world surgical settings. The primary questions it seeks to address are:
Using the direct measurement method as the reference standard, what is the magnitude of measurement error of the monitoring system, and does it tend to overestimate or underestimate blood loss? Does the monitoring system demonstrate superior accuracy compared with visual estimation, the gravimetric method, and the hemoglobin concentration-based method? During surgery, intraoperative blood loss will be measured simultaneously using five approaches: the novel multifunctional monitoring system, the direct measurement method, visual estimation, the gravimetric method, and the hemoglobin concentration method. These measurements will be conducted without interfering with the surgical procedure.
Přehled studie
Postavení
Podmínky
Typ studie
Zápis (Odhadovaný)
Kontakty a umístění
Studijní místa
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Gansu
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Lanzhou, Gansu, Čína, 730030
- Lanzhou University Second Hospital
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Lanzhou, Gansu, Čína, 730030
- Lanzhou University Frist Hospital
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Lanzhou, Gansu, Čína, 730030
- Gansu Provincial People's Hospital
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Kritéria účasti
Kritéria způsobilosti
Věk způsobilý ke studiu
- Dospělý
- Starší dospělý
Přijímá zdravé dobrovolníky
Metoda odběru vzorků
Studijní populace
Popis
Inclusion Criteria:
- Patients undergoing elective urological or general surgical procedures
- Age 18 years or older
- Preoperative hemoglobin concentration available
- Intraoperative blood loss assessment required during surgery
Exclusion Criteria:
- Patients with incomplete intraoperative blood loss measurement data,
- Severe hemolysis or other conditions that may affect hemoglobin measurement
- Emergency surgery
- Intraoperative blood loss assessment required during surgery 24 hours after surgery
- Refusal to participate, when applicable
Studijní plán
Jak je studie koncipována?
Detaily designu
Kohorty a intervence
Skupina / kohorta |
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Self-controlled
This study includes a single self-controlled cohort of patients undergoing urological and general surgical procedures. All participants will undergo simultaneous intraoperative blood loss assessment using five different methods within the same surgical procedure: a novel multifunctional intraoperative blood loss monitoring system, the direct measurement method (reference standard), visual estimation, the gravimetric method, and the hemoglobin concentration-based method. No intervention is applied in this observational study. All measurements are performed according to a predefined protocol and do not interfere with the standard surgical workflow. The purpose of this design is to enable within-subject comparison of measurement accuracy across different methods under identical clinical conditions. |
Co je měření studie?
Primární výstupní opatření
Měření výsledku |
Popis opatření |
Časové okno |
|---|---|---|
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Absolute error of the automatic intraoperative blood loss monitor compared with the direct measurement method
Časové okno: At the end of surgery
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Absolute error is defined as the numerical difference between intraoperative blood loss measured by the automatic intraoperative blood loss monitor and intraoperative blood loss measured by the direct measurement method. A positive value indicates that the monitor overestimates blood loss compared with the direct measurement method, whereas a negative value indicates underestimation. Unit of Measure: Milliliters (mL) |
At the end of surgery
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Sekundární výstupní opatření
Měření výsledku |
Popis opatření |
Časové okno |
|---|---|---|
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Percentage error of the automatic intraoperative blood loss monitor compared with the direct measurement method
Časové okno: At the end of surgery
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Percentage error is defined as the relative difference between intraoperative blood loss measured by the automatic intraoperative blood loss monitor and intraoperative blood loss measured by the direct measurement method, expressed as a percentage of the average value obtained by the two methods. A positive value indicates overestimation by the monitor, whereas a negative value indicates underestimation. Unit of Measure: Percentage |
At the end of surgery
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Absolute error of visual estimation compared with the direct measurement method
Časové okno: At the end of surgery
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Absolute error is defined as the numerical difference between intraoperative blood loss estimated by visual estimation and intraoperative blood loss measured by the direct measurement method. A positive value indicates overestimation by visual estimation, whereas a negative value indicates underestimation. Unit of Measure: Milliliters |
At the end of surgery
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Absolute error of the gravimetric method compared with the direct measurement method
Časové okno: At the end of surgery
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The accuracy of five methods (monitoring system, direct measurement, visual Absolute error is defined as the numerical difference between intraoperative blood loss estimated by the gravimetric method and intraoperative blood loss measured by the direct measurement method. A positive value indicates overestimation by the gravimetric method, whereas a negative value indicates underestimation. Unit of Measure: Milliliters |
At the end of surgery
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Absolute error of the hemoglobin concentration-based method compared with the direct measurement method
Časové okno: 24 hours after surgery
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Absolute error is defined as the numerical difference between blood loss estimated by the hemoglobin concentration-based method and intraoperative blood loss measured by the direct measurement method. The hemoglobin concentration-based estimate is calculated using preoperative hemoglobin concentration, hemoglobin concentration measured 24 hours after surgery, and estimated blood volume. A positive value indicates overestimation by the hemoglobin concentration-based method, whereas a negative value indicates underestimation. Unit of Measure: Milliliters |
24 hours after surgery
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Intraclass correlation coefficient between the automatic intraoperative blood loss monitor and the direct measurement method
Časové okno: At the end of surgery
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The intraclass correlation coefficient is used to quantify agreement between intraoperative blood loss measured by the automatic intraoperative blood loss monitor and intraoperative blood loss measured by the direct measurement method. Higher values indicate stronger agreement between the two methods. Unit of Measure: Unitless coefficient |
At the end of surgery
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Bland-Altman mean bias between the automatic intraoperative blood loss monitor and the direct measurement method
Časové okno: Unit of Measure: Milliliters
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Bland-Altman mean bias is defined as the mean difference between intraoperative blood loss measured by the automatic intraoperative blood loss monitor and intraoperative blood loss measured by the direct measurement method.
A positive mean bias indicates systematic overestimation by the monitor, whereas a negative mean bias indicates systematic underestimation.
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Unit of Measure: Milliliters
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Bland-Altman limits of agreement between the automatic intraoperative blood loss monitor and the direct measurement method
Časové okno: At the end of surgery
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Bland-Altman limits of agreement describe the range within which most differences between intraoperative blood loss measured by the automatic intraoperative blood loss monitor and intraoperative blood loss measured by the direct measurement method are expected to fall. Unit of Measure: Milliliters |
At the end of surgery
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Spolupracovníci a vyšetřovatelé
Spolupracovníci
Termíny studijních záznamů
Hlavní termíny studia
Začátek studia (Aktuální)
Primární dokončení (Odhadovaný)
Dokončení studie (Odhadovaný)
Termíny zápisu do studia
První předloženo
První předloženo, které splnilo kritéria kontroly kvality
První zveřejněno (Aktuální)
Aktualizace studijních záznamů
Poslední zveřejněná aktualizace (Aktuální)
Odeslaná poslední aktualizace, která splnila kritéria kontroly kvality
Naposledy ověřeno
Více informací
Termíny související s touto studií
Klíčová slova
Další relevantní podmínky MeSH
Další identifikační čísla studie
- 2025A-987
Plán pro data jednotlivých účastníků (IPD)
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Popis plánu IPD
Informace o lécích a zařízeních, studijní dokumenty
Studuje lékový produkt regulovaný americkým FDA
Studuje produkt zařízení regulovaný americkým úřadem FDA
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