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Diastolic Shock Index for Predicting Hemodynamic Instability During Continuous Renal Replacement Therapy (DSI-CRRT)

1. november 2026 opdateret af: Mahmut Baran Kasisari, Istanbul University - Cerrahpasa

Continuous renal replacement therapy (CRRT) is commonly used in critically ill patients with acute kidney injury. A frequent complication of CRRT is a drop in blood pressure that requires treatment, known as CRRT-associated hemodynamic instability. This complication is linked to higher mortality and poorer kidney recovery.

The diastolic shock index (DSI) is a simple bedside measure calculated by dividing heart rate by diastolic blood pressure. It requires no additional devices, blood tests or invasive procedures, and higher values have been associated with vasopressor need and mortality in septic shock.

This prospective observational study aims to determine whether DSI measured before the start of CRRT can predict hemodynamic instability during CRRT in adult intensive care unit patients. The predictive performance of DSI will also be compared with the classic shock index, the modified shock index and mean arterial pressure. All data will be obtained from routine clinical monitoring; no additional intervention will be performed for the study.

Studieoversigt

Status

Ikke rekrutterer endnu

Betingelser

Intervention / Behandling

Detaljeret beskrivelse

Background: CRRT-associated hemodynamic instability (CRRT-HI) complicates 19-43% of CRRT sessions and is independently associated with increased mortality and impaired renal recovery. The diastolic shock index (DSI = heart rate / diastolic arterial pressure) reflects both vascular tone (diastolic pressure) and neurohumoral compensation (heart rate) and has been proposed as an early marker of vasoplegia. Its predictive value for CRRT-HI has not been prospectively evaluated.

Objective: To evaluate the diagnostic performance of pre-CRRT bedside DSI in predicting CRRT-HI in critically ill adults.

Design and setting: Prospective observational cohort study conducted in the general intensive care units of Basaksehir Cam and Sakura City Hospital, Istanbul, Turkey. Approximately 70 adult patients (≥18 years) starting CRRT for acute kidney injury will be enrolled.

Definition of CRRT-HI: An event meeting at least one of the following criteria: mean arterial pressure below 65 mmHg; initiation of a new vasopressor or an increase of ≥20% in the norepinephrine dose; crystalloid fluid bolus exceeding 250 mL; or reduction or discontinuation of ultrafiltration.

Data collection: Demographic and clinical characteristics (APACHE II, SOFA-2, comorbidities, CRRT indication and AKI stage), CRRT settings (modality, blood flow, dialysate and replacement fluid rates, ultrafiltration rate, anticoagulation), and baseline laboratory parameters (arterial blood gas, lactate, complete blood count, renal and liver function tests, electrolytes, CRP, procalcitonin) will be recorded. Heart rate, systolic, diastolic and mean arterial pressures, vasopressor/inotrope use and doses will be recorded at CRRT initiation (T0) and at 15, 30, 60 and 180 minutes. DSI, the classic shock index (HR/SAP) and the modified shock index (HR/MAP) will be calculated from these routine monitoring data. No additional blood sampling, tests or invasive procedures will be performed for the study.

Statistical analysis: The predictive performance of DSI, the classic shock index, the modified shock index and mean arterial pressure will be assessed by ROC curve analysis and compared using the DeLong test. Optimal cut-off values will be determined by the Youden index, with corresponding sensitivity and specificity. Independent risk factors for CRRT-HI will be identified by multivariable logistic regression. Associations of DSI and CRRT-HI with 28-day mortality, ICU and hospital length of stay, duration of mechanical ventilation and renal recovery will be evaluated as secondary analyses.

Sample size: Assuming a CRRT-HI incidence of approximately 50% and an expected AUC of 0.75 for DSI, at least 60 patients are required (α = 0.05, power = 80%). Allowing for approximately 15% data loss, 70 patients will be enrolled.

Undersøgelsestype

Observationel

Tilmelding (Anslået)

70

Kontakter og lokationer

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Studiekontakt

Studiesteder

Deltagelseskriterier

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Berettigelseskriterier

Aldre berettiget til at studere

18 år og ældre (Voksen, Ældre voksen)

Tager imod sunde frivillige

Ingen

Køn, der er berettiget til at studere

Alle

Prøveudtagningsmetode

Ikke-sandsynlighedsprøve

Studiebefolkning

Consecutive adult patients (≥18 years) admitted to the general intensive care units of Basaksehir Cam and Sakura City Hospital, Istanbul, Turkey, in whom continuous renal replacement therapy is initiated for acute kidney injury.

Beskrivelse

Inclusion Criteria:

  • Age 18 years or older
  • Admission to the general intensive care unit
  • Initiation of continuous renal replacement therapy (CRRT) for acute kidney injury
  • Standard CRRT indication determined by the attending physician (e.g., uremic complications, refractory fluid overload, hyperkalemia, metabolic acidosis)
  • Written informed consent obtained from the patient or legal representative

Exclusion Criteria:

  • Pregnancy
  • Chronic kidney disease on a maintenance intermittent hemodialysis program before the study
  • Significant arrhythmia that may affect diastolic shock index calculation and hemodynamic assessment (e.g., permanent atrial fibrillation, frequent ventricular extrasystoles)
  • Permanent discontinuation of CRRT within the first hour due to technical reasons (e.g., catheter dysfunction, circuit clotting)
  • Missing or inconsistent data on key hemodynamic parameters

Studieplan

Dette afsnit indeholder detaljer om studieplanen, herunder hvordan undersøgelsen er designet, og hvad undersøgelsen måler.

Hvordan er undersøgelsen tilrettelagt?

Design detaljer

  • Observationsmodeller: COHORT
  • Tidsperspektiver: PROSPECTIVE

Kohorter og interventioner

Gruppe / kohorte
Intervention / Behandling
Critically Ill Adults Receiving CRRT

Adult patients (≥18 years) admitted to the general intensive care units of Basaksehir Cam and Sakura City Hospital who are initiated on continuous renal replacement therapy (CRRT) for acute kidney injury. The diastolic shock index (heart rate / diastolic arterial pressure) will be calculated from routine bedside monitoring before and during CRRT, and patients will be followed for the development of CRRT-associated hemodynamic instability. No study-specific intervention will be performed.

Bedside calculation of the diastolic shock index (heart rate / diastolic arterial pressure) from routine hemodynamic monitoring at CRRT initiation and at 15, 30, 60 and 180 minutes. No additional procedure is performed.

Hvad måler undersøgelsen?

Primære resultatmål

Resultatmål
Foranstaltningsbeskrivelse
Tidsramme
Diagnostic Performance of Pre-CRRT Diastolic Shock Index for Predicting CRRT-Associated Hemodynamic Instability
Tidsramme: From CRRT initiation to 180 minutes

Area under the receiver operating characteristic curve (AUC) of the diastolic shock index (heart rate / diastolic arterial pressure) measured immediately before CRRT initiation for predicting CRRT-associated hemodynamic instability. CRRT-associated hemodynamic instability is defined as at least one of the following: mean arterial pressure <65 mmHg; initiation of a new vasopressor or ≥20% increase in norepinephrine dose; crystalloid fluid bolus >250 mL; or reduction or discontinuation of ultrafiltration. The optimal cut-off value will be determined by the Youden index, with corresponding sensitivity and specificity.

From CRRT initiation to 180 minutes

Sekundære resultatmål

Resultatmål
Foranstaltningsbeskrivelse
Tidsramme
Comparison of Diastolic Shock Index With Other Bedside Hemodynamic Indices
Tidsramme: From CRRT initiation to 180 minutes

AUC of the diastolic shock index compared with the classic shock index (heart rate / systolic arterial pressure), modified shock index (heart rate / mean arterial pressure) and mean arterial pressure for predicting CRRT-associated hemodynamic instability, compared using the DeLong test.

From CRRT initiation to 180 minutes
Incidence of CRRT-Associated Hemodynamic Instability
Tidsramme: From CRRT initiation to 180 minutes

proportion of patients developing CRRT-associated hemodynamic instability as defined in the primary outcome.

From CRRT initiation to 180 minutes
28-Day All-Cause Mortality
Tidsramme: 28 days after CRRT initiation

All-cause mortality within 28 days of CRRT initiation, compared according to diastolic shock index values and the occurrence of CRRT-associated hemodynamic instability.

28 days after CRRT initiation

Samarbejdspartnere og efterforskere

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Sponsor

Efterforskere

  • Ledende efterforsker: mahmut baran kaşısarı, md, Başakşehir Çam & Sakura City Hospital

Publikationer og nyttige links

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Datoer for undersøgelser

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Studer store datoer

Studiestart (Anslået)

15. november 2026

Primær færdiggørelse (Anslået)

31. januar 2027

Studieafslutning (Anslået)

1. februar 2027

Datoer for studieregistrering

Først indsendt

1. november 2026

Først indsendt, der opfyldte QC-kriterier

1. november 2026

Først opslået (Faktiske)

5. november 2026

Opdateringer af undersøgelsesjournaler

Sidste opdatering sendt (Faktiske)

5. november 2026

Sidste opdatering indsendt, der opfyldte kvalitetskontrolkriterier

1. november 2026

Sidst verificeret

1. november 2026

Mere information

Begreber relateret til denne undersøgelse

Andre undersøgelses-id-numre

  • E-96317027-514.10-321013232

Plan for individuelle deltagerdata (IPD)

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IPD-deling Understøttende informationstype

  • STUDY_PROTOCOL
  • SAP

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