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Comparison of Angiotensin II to Standard Dose Vasopressors on Change in Arterial Elastance (Ang2)

28 kwietnia 2026 zaktualizowane przez: Siddharth Dugar, The Cleveland Clinic

Comparison of Angiotensin II to Standard Dose Vasopressors on Change in Arterial Elastance in Cirrhotic Patients With Vasodilatory Shock: A Prospective, Randomized Controlled Trial

A study to see whether a medication called Angiotensin II works better than the routinely used medication to raise blood pressure in people with liver disease who are experiencing a serious drop in blood pressure.

The investigators want to find out if Angiotensin II can help the heart and blood vessels work together more effectively than standard treatments.

Przegląd badań

Szczegółowy opis

Sepsis and septic shock remain associated with significant mortality, especially in cirrhotic where the mortality with septic shock exceeds 70%. Cirrhotic cardiomyopathy is a well-recognized consequence of advanced liver dysfunction and is associated with a hyperdynamic circulatory state due to vasoplegia in this population. Our group has shown septic patients with cirrhosis had higher LV systolic function as assessed by Left ventricle Ejection fraction (LVEF %), stroke volume and cardiac output with a significantly higher percentage of patients with hyperdynamic state (LVEF > 70%) than those without cirrhosis.

The investigators measured arterial elastance and ventricular elastance using echocardiography and found cirrhotic patient to have significantly lower arterial elastance with higher ventricular elastance. AII (Angiotensin II) exert its effect after the hydrolysis of Ang-1 by angiotensin converting enzyme (ACE) and is the principal product of the renin-angiotensin-aldosterone system. Advance cirrhosis is associated with reduction in Ang II levels accompanied by an increased Ang-(1-7)/Ang II ratio in the splanchnic circulation may be, at least in part, responsible for changes in vascular splanchnic tone. In addition, the relative decrease in Ang II compared to Ang (1-7), the vasodilator component of RAS causes hyperdynamic circulation from lower SVR in cirrhotic. This study also showed that with progression of liver disease leads to continual splanchnic vasodilation from higher Ang (1-7)/Ang II ratio. In advance stages this resultant hyperdynamic circulation is still insufficient to compensate for the effective arterial hypovolemia. Similar finding was observed in our large study, where the VAC was significantly lower in cirrhotic with sepsis shock despite elevation in LV elastance compared to non-cirrhotic with septic shock.

Angiotensin II, a naturally occurring octapeptide hormone increases blood pressure through various mechanisms, including vasoconstriction of peripheral vessels, potentiation of antidiuretic hormone (ADH) and adrenocorticotropin hormone (ACTH) release, and direct actions on postganglionic sympathetic fibers. The external Ang II administration will be able to reverse the altered Ang (I-7)/Ang II ratio in systemic circulation reversing vasodilation. The investigators hypothesize that external administration of Ang II will cause a higher increase in SVR in cirrhotic with septic shock compared to Standard of Care (SOC) by decreasing arterial elastance restoring non-invasive arterial ventricular coupling.

Typ studiów

Interwencyjne

Zapisy (Rzeczywisty)

30

Faza

  • Wczesna faza 1

Kontakty i lokalizacje

Ta sekcja zawiera dane kontaktowe osób prowadzących badanie oraz informacje o tym, gdzie badanie jest przeprowadzane.

Lokalizacje studiów

    • Ohio
      • Cleveland, Ohio, Stany Zjednoczone, 44195
        • The Cleveland Clinic

Kryteria uczestnictwa

Badacze szukają osób, które pasują do określonego opisu, zwanego kryteriami kwalifikacyjnymi. Niektóre przykłady tych kryteriów to ogólny stan zdrowia danej osoby lub wcześniejsze leczenie.

Kryteria kwalifikacji

Wiek uprawniający do nauki

  • Dorosły
  • Starszy dorosły

Akceptuje zdrowych ochotników

Nie

Opis

Inclusion Criteria:

  • Age ≥ 18 years at the time of enrollment
  • Septic shock as defined by Sepsis-3 criteria (highly suspected or confirmed infection, requiring norepinephrine to maintain a MAP ≥ 65 mmHg, and serum lactate > 2 mmol/L after adequate fluid resuscitation) within a 48 hour window prior to enrollment
  • Confirmed cirrhotic patient (Radiological/Biopsy/Physician confirmed)
  • Preserved cardiac function as assessed using point-of-care ultrasonography or a non-invasive hemodynamic monitoring device with either LVOT VTI > 18 cm or stroke volume > 50 ml Within 48 hours of onset of shock.
  • Standard of care vasopressors are at a norepinephrine equivalent of 15 mcg/min

Exclusion Criteria:

  • Declined consent.
  • Pregnancy
  • CKD-Stage IV/V
  • ESRD on long-term hemodialysis
  • On Dialysis or planned dialysis to be initiated within 24 hours of study of enrollment.
  • Clinically determined to have primarily hepatorenal syndrome.
  • On other vasoactive medication (phenylephrine, Terlipressin, epinephrine, dobutamine, dopamine)
  • Hemorrhagic, obstructive, or hypovolemic shock is not the primary cause of shock based on clinical judgement.
  • DNR
  • Patients declared Brain dead.
  • Anticipated death within 48 hours of enrollment
  • Echocardiographic windows not available
  • Acute mesenteric Ischemia
  • Active gastrointestinal bleeding
  • Active cardiac ischemic event defined as NSTEMi, STEMI
  • Acute DVT/Pulmonary embolism/Portal vein thrombosis
  • > 48 h since initiation of vasopressor agent
  • Cardiac function assessment show LVOT VTI < 18 cm or stroke volume < 50 ml/min
  • Norepinephrine equivalent dose > 50mcg/min

Plan studiów

Ta sekcja zawiera szczegółowe informacje na temat planu badania, w tym sposób zaprojektowania badania i jego pomiary.

Jak projektuje się badanie?

Szczegóły projektu

  • Główny cel: Leczenie
  • Przydział: Randomizowane
  • Model interwencyjny: Przydział równoległy
  • Maskowanie: Brak (otwarta etykieta)

Broń i interwencje

Grupa uczestników / Arm
Interwencja / Leczenie
Aktywny komparator: Angiotensin II
Angiotensin II will be continued for 24 hours and then discontinued, and SOC vasopressors resumed according to institutional practices.
2.5 mg/mL
Inne nazwy:
  • Angiotension II
Brak interwencji: Standard of Care
Fixed-dose vasopressin and standard of care vasopressors increased as per institutional guidelines according to MAP targets.

Co mierzy badanie?

Podstawowe miary wyniku

Miara wyniku
Opis środka
Ramy czasowe
Change in arterial elastance
Ramy czasowe: 6 hours
Change in arterial elastance will be measure by echocardiography at baseline, 6 hours and 24 hours. Dynamic arterial elastance will be calculated as the ratio between pulse pressure variation and stroke volume variation obtained from arterial line waveform.
6 hours
Change in arterial elastance
Ramy czasowe: 24 hours
Change in arterial elastance will be measure by echocardiography at baseline, 6 hours and 24 hours. Dynamic arterial elastance will be calculated as the ratio between pulse pressure variation and stroke volume variation obtained from arterial line waveform.
24 hours

Miary wyników drugorzędnych

Miara wyniku
Opis środka
Ramy czasowe
Change in arterial ventricular coupling
Ramy czasowe: 6 hours
Change in arterial ventricular coupling will be measured by echocardiogram at baseline, 6 hours and 24 hours. The ventricular-arterial coupling will be assessed using previously validated method where Left ventricular end-systolic elastance will be calculated by a modified single-beat method employing systolic and diastolic pressure from the arterial line, echo-Doppler stroke volume (SV), echo-derived ejection fraction (EF) and an estimated normalized ventricular elastance at arterial end-diastole (E(Nd)): E(es(sb)) = [P(d) - (E(Nd(est)) x P(s) x 0.9)[/(E(Nd(est)) x SV).
6 hours
Change in arterial ventricular coupling
Ramy czasowe: 24 hours
Change in arterial ventricular coupling will be measured by echocardiogram at baseline, 6 hours and 24 hours. The ventricular-arterial coupling will be assessed using previously validated method where Left ventricular end-systolic elastance will be calculated by a modified single-beat method employing systolic and diastolic pressure from the arterial line, echo-Doppler stroke volume (SV), echo-derived ejection fraction (EF) and an estimated normalized ventricular elastance at arterial end-diastole (E(Nd)): E(es(sb)) = [P(d) - (E(Nd(est)) x P(s) x 0.9)[/(E(Nd(est)) x SV).
24 hours
Change in norepinephrine equivalent dose
Ramy czasowe: 6 hours
The change in norepinephrine equivalent dose at (6 hours and 24 hours) using the following formula6 Norepinephrine dose (µg/kg/min) + epinephrine dose (µg/kg/min) + 1/150 × dopamine dose (µg/kg/min) + 1/10 × phenylephrine dose (µg/kg/min) + 2.5 × vasopressin dose (U/min)
6 hours
Change in norepinephrine equivalent dose
Ramy czasowe: 24 hours
The change in norepinephrine equivalent dose at (6 hours and 24 hours) using the following formula6 Norepinephrine dose (µg/kg/min) + epinephrine dose (µg/kg/min) + 1/150 × dopamine dose (µg/kg/min) + 1/10 × phenylephrine dose (µg/kg/min) + 2.5 × vasopressin dose (U/min)
24 hours
Change in renal perfusion index
Ramy czasowe: 6 hours

Improvement in renal perfusion index (Renal Resistive index) at (6 hours and 24 hours).

The Doppler-based renal restrictive index (RI) will be used for measurement using spectral Doppler at the arcuate arteries or interlobar arteries. The formula for calculating the RI is: RI = (Peak Systolic Velocity - End Diastolic Velocity) / Peak Systolic Velocity. The normal range for the RI is 0.50 to 0.70, and elevated values are associated with poorer prognosis in various renal disorders and renal transplant outcomes.

6 hours
Change in renal perfusion index
Ramy czasowe: 24 hours

Improvement in renal perfusion index (Renal Resistive index) at (6 hours and 24 hours).

The Doppler-based renal restrictive index (RI) will be used for measurement using spectral Doppler at the arcuate arteries or interlobar arteries. The formula for calculating the RI is: RI = (Peak Systolic Velocity - End Diastolic Velocity) / Peak Systolic Velocity. The normal range for the RI is 0.50 to 0.70, and elevated values are associated with poorer prognosis in various renal disorders and renal transplant outcomes.

24 hours
Evaluation of 28 day renal replacement therapy free survival
Ramy czasowe: 28 days after hospital discharge
The number of days alive free of renal-replacement therapy at 28 days
28 days after hospital discharge
Change in Renin levels
Ramy czasowe: 24 hours

A blood sample will be obtained at two time points. The first sample will be obtained when the participant is randomized but before infusion in initiated. The second sample will be obtained at 24 hours after the initiation of the drug.

Plasma Renin Activity (PRA) is measured in ng/mL/h.

24 hours
Change in Angiotension II levels
Ramy czasowe: 24 hours

A blood sample will be obtained at two time points. The first sample will be obtained when the participant is randomized but before infusion in initiated. The second sample will be obtained at 24 hours after the initiation of the drug.

Angiotensin II will be expressed in ng/dL.

24 hours
Change in Microcirculation
Ramy czasowe: 6 hours
Tissue oxygen saturation (StO₂) will be measured using near-infrared spectroscopy (NIRS) at the thenar eminence. Microvascular reactivity will be assessed using a vascular occlusion test (VOT). Dynamic variables derived from the VOT will include baseline StO₂, minimum StO₂ during occlusion, and reperfusion slope.
6 hours
Change in Microcirculation
Ramy czasowe: 24 hours
Tissue oxygen saturation (StO₂) will be measured using near-infrared spectroscopy (NIRS) at the thenar eminence. Microvascular reactivity will be assessed using a vascular occlusion test (VOT). Dynamic variables derived from the VOT will include baseline StO₂, minimum StO₂ during occlusion, and reperfusion slope.
24 hours

Współpracownicy i badacze

Tutaj znajdziesz osoby i organizacje zaangażowane w to badanie.

Śledczy

  • Główny śledczy: Siddharth Dugar, M.D., The Cleveland Clinic

Daty zapisu na studia

Daty te śledzą postęp w przesyłaniu rekordów badań i podsumowań wyników do ClinicalTrials.gov. Zapisy badań i zgłoszone wyniki są przeglądane przez National Library of Medicine (NLM), aby upewnić się, że spełniają określone standardy kontroli jakości, zanim zostaną opublikowane na publicznej stronie internetowej.

Główne daty studiów

Rozpoczęcie studiów (Rzeczywisty)

15 listopada 2024

Zakończenie podstawowe (Szacowany)

1 stycznia 2028

Ukończenie studiów (Szacowany)

1 stycznia 2028

Daty rejestracji na studia

Pierwszy przesłany

19 lutego 2026

Pierwszy przesłany, który spełnia kryteria kontroli jakości

28 kwietnia 2026

Pierwszy wysłany (Rzeczywisty)

5 maja 2026

Aktualizacje rekordów badań

Ostatnia wysłana aktualizacja (Rzeczywisty)

5 maja 2026

Ostatnia przesłana aktualizacja, która spełniała kryteria kontroli jakości

28 kwietnia 2026

Ostatnia weryfikacja

1 lutego 2026

Więcej informacji

Terminy związane z tym badaniem

Plan dla danych uczestnika indywidualnego (IPD)

Planujesz udostępniać dane poszczególnych uczestników (IPD)?

TAK

Opis planu IPD

After the study is completed, de-identified data and study documents may be shared on ClinicalTrials.gov in accordance with institutional policies and regulatory requirements.

Ramy czasowe udostępniania IPD

Starting in January 2029.

Kryteria dostępu do udostępniania IPD

Researchers can access the information on clinicaltrials.gov.

Typ informacji pomocniczych dotyczących udostępniania IPD

  • PROTOKÓŁ BADANIA
  • SOK ROŚLINNY
  • ICF
  • ANALITYCZNY_KOD
  • CSR

Informacje o lekach i urządzeniach, dokumenty badawcze

Bada produkt leczniczy regulowany przez amerykańską FDA

Tak

Bada produkt urządzenia regulowany przez amerykańską FDA

Nie

produkt wyprodukowany i wyeksportowany z USA

Tak

Te informacje zostały pobrane bezpośrednio ze strony internetowej clinicaltrials.gov bez żadnych zmian. Jeśli chcesz zmienić, usunąć lub zaktualizować dane swojego badania, skontaktuj się z register@clinicaltrials.gov. Gdy tylko zmiana zostanie wprowadzona na stronie clinicaltrials.gov, zostanie ona automatycznie zaktualizowana również na naszej stronie internetowej .

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