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Clinical Validation of a Blood Loss Monitoring System

31 maggio 2026 aggiornato da: Zhiping Wang, Lanzhou University Second Hospital

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.

Panoramica dello studio

Stato

Iscrizione su invito

Condizioni

Tipo di studio

Osservativo

Iscrizione (Stimato)

120

Contatti e Sedi

Questa sezione fornisce i recapiti di coloro che conducono lo studio e informazioni su dove viene condotto lo studio.

Luoghi di studio

  • Cina
    • Gansu
      • Lanzhou, Gansu, Cina, 730030
        • Lanzhou University Second Hospital
      • Lanzhou, Gansu, Cina, 730030
        • Lanzhou University Frist Hospital
      • Lanzhou, Gansu, Cina, 730030
        • Gansu Provincial People's Hospital

Criteri di partecipazione

I ricercatori cercano persone che corrispondano a una certa descrizione, chiamata criteri di ammissibilità. Alcuni esempi di questi criteri sono le condizioni generali di salute di una persona o trattamenti precedenti.

Criteri di ammissibilità

Età idonea allo studio

  • Adulto
  • Adulto più anziano

Accetta volontari sani

No

Metodo di campionamento

Campione non probabilistico

Popolazione di studio

The study population will be recruited from adult patients undergoing elective urological and general surgical procedures at two tertiary hospitals in China, including Lanzhou University Second Hospital and Lanzhou University First Hospital. Participants will be selected from routine clinical practice settings where intraoperative blood loss monitoring is required. This population represents adult surgical patients managed under standard perioperative care, providing a real-world clinical context for evaluating intraoperative blood loss measurement methods.

Descrizione

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

Piano di studio

Questa sezione fornisce i dettagli del piano di studio, compreso il modo in cui lo studio è progettato e ciò che lo studio sta misurando.

Come è strutturato lo studio?

Dettagli di progettazione

Coorti e interventi

Gruppo / Coorte
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.

Cosa sta misurando lo studio?

Misure di risultato primarie

Misura del risultato
Misura Descrizione
Lasso di tempo
Absolute error of the automatic intraoperative blood loss monitor compared with the direct measurement method
Lasso di tempo: At the end of surgery

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

Misure di risultato secondarie

Misura del risultato
Misura Descrizione
Lasso di tempo
Percentage error of the automatic intraoperative blood loss monitor compared with the direct measurement method
Lasso di tempo: At the end of surgery

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
Absolute error of visual estimation compared with the direct measurement method
Lasso di tempo: At the end of surgery

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
Absolute error of the gravimetric method compared with the direct measurement method
Lasso di tempo: At the end of surgery

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
Absolute error of the hemoglobin concentration-based method compared with the direct measurement method
Lasso di tempo: 24 hours after surgery

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
Intraclass correlation coefficient between the automatic intraoperative blood loss monitor and the direct measurement method
Lasso di tempo: At the end of surgery

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
Bland-Altman mean bias between the automatic intraoperative blood loss monitor and the direct measurement method
Lasso di tempo: Unit of Measure: Milliliters
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.
Unit of Measure: Milliliters
Bland-Altman limits of agreement between the automatic intraoperative blood loss monitor and the direct measurement method
Lasso di tempo: At the end of surgery

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

Collaboratori e investigatori

Qui è dove troverai le persone e le organizzazioni coinvolte in questo studio.

Sponsor

Lanzhou University Second Hospital

Collaboratori

Lanzhou University First Hospital

Studiare le date dei record

Queste date tengono traccia dell'avanzamento della registrazione dello studio e dell'invio dei risultati di sintesi a ClinicalTrials.gov. I record degli studi e i risultati riportati vengono esaminati dalla National Library of Medicine (NLM) per assicurarsi che soddisfino specifici standard di controllo della qualità prima di essere pubblicati sul sito Web pubblico.

Studia le date principali

Inizio studio (Effettivo)

10 settembre 2025

Completamento primario (Stimato)

30 maggio 2026

Completamento dello studio (Stimato)

30 maggio 2026

Date di iscrizione allo studio

Primo inviato

5 maggio 2026

Primo inviato che soddisfa i criteri di controllo qualità

23 maggio 2026

Primo Inserito (Effettivo)

1 giugno 2026

Aggiornamenti dei record di studio

Ultimo aggiornamento pubblicato (Effettivo)

3 giugno 2026

Ultimo aggiornamento inviato che soddisfa i criteri QC

31 maggio 2026

Ultimo verificato

1 aprile 2026

Maggiori informazioni

Termini relativi a questo studio

Parole chiave

Termini MeSH pertinenti aggiuntivi

Altri numeri di identificazione dello studio

  • 2025A-987

Piano per i dati dei singoli partecipanti (IPD)

Hai intenzione di condividere i dati dei singoli partecipanti (IPD)?

INDECISO

Descrizione del piano IPD

The clinical data involves sensitive patient privacy. We are currently undecided on sharing the IPD, as it requires specific informed consent from the patients and authorization from the hospital's ethics committee.

Informazioni su farmaci e dispositivi, documenti di studio

Studia un prodotto farmaceutico regolamentato dalla FDA degli Stati Uniti

No

Studia un dispositivo regolamentato dalla FDA degli Stati Uniti

No

Queste informazioni sono state recuperate direttamente dal sito web clinicaltrials.gov senza alcuna modifica. In caso di richieste di modifica, rimozione o aggiornamento dei dettagli dello studio, contattare register@clinicaltrials.gov. Non appena verrà implementata una modifica su clinicaltrials.gov, questa verrà aggiornata automaticamente anche sul nostro sito web .

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