Cited by 119Sepsis Diagnosis and TreatmentRenin-Angiotensin System StudiesAcute Kidney Injury Research

Renin-angiotensin system activation correlates with microvascular dysfunction in a prospective cohort study of clinical sepsis

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Doerschug, Kevin C, Delsing, Angela S, Schmidt, Gregory A, Ashare, Alix·2010·Critical Care

Abstract

Introduction: Microvascular dysregulation characterized by hyporesponsive vessels and heterogeneous bloodflow is implicated in the pathogenesis of organ failure in sepsis. The renin-angiotensin system (RAS) affects the microvasculature, yet the relationships between RAS and organ injury in clinical sepsis remain unclear. We tested our hypothesis that systemic RAS mediators are associated with dysregulation of the microvasculature and with organ failure in clinical severe sepsis. Methods: We studied 30 subjects with severe sepsis, and 10 healthy control subjects. Plasma was analyzed for plasma renin activity (PRA) and angiotensin II concentration (Ang II). Using near-infrared spectroscopy, we measured the rate of increase in the oxygen saturation of thenar microvascular hemoglobin after five minutes of induced forearm ischemia. In so doing, we assessed bulk microvascular hemoglobin influx to the tissue during reactive hyperemia. We studied all subjects 24 hours after the development of organ failure. We studied a subset of 12 subjects at an additional timepoint, eight hours after recognition of organ failure (early sepsis). Results: After 24 hours of resuscitation to clinically-defined endpoints of preload and arterial pressure, Ang II and PRA were elevated in septic subjects and the degree of elevation correlated negatively with the rate of microvascular reoxygenation during reactive hyperemia. Early RAS mediators correlated with microvascular dysfunction. Early Ang II also correlated with the extent of organ failure realized during the first day of sepsis. Conclusions: RAS is activated in clinical severe sepsis. Systemic RAS mediators correlate with measures of microvascular dysregulation and with organ failure.

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Authors
Doerschug, K. C., Delsing, A. S., Schmidt, G. A., & Ashare, A.
Affiliations
  • University of Iowa (US)
  • Dartmouth College (US)
Corresponding author
Doerschug, Kevin C
Venue
Critical Care
Published
2010-02-22
Volume
14
Issue
1
Pages
R24-R24
ISSN
1364-8535 (ISSN-L)
OpenAlex
W2134540051
Cited by
119
References
45
Citations by year
2026: 3 · 2025: 3 · 2024: 7 · 2023: 11 · 2022: 8 · 2021: 16 · 2020: 13 · 2019: 10 · 2018: 7 · 2017: 6 · 2016: 5 · 2015: 7 · 2014: 7 · 2013: 7 · 2012: 3
FWCI
3.72
Type
journal article
Language
en
Open access
Locations
  • Critical Care (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
Funders
  • American Heart Association
  • National Institutes of Health
  • National Institute on Alcohol Abuse and Alcoholism (K08DK073519-AA)
  • National Heart, Lung, and Blood Institute (K23HL071246)
  • National Institute of Allergy and Infectious Diseases (L30 AI062287)
  • National Institute of Diabetes and Digestive and Kidney Diseases (R03DK084057, K08DK073519)
  • National Center for Research Resources (UL1RR024979)
Topics
  • Health Sciences › Medicine › Epidemiology › Sepsis Diagnosis and Treatment
  • Health Sciences › Medicine › Cardiology and Cardiovascular Medicine › Renin-Angiotensin System Studies
  • Health Sciences › Medicine › Nephrology › Acute Kidney Injury Research
Keywords
renin-angiotensin system, severe sepsis, microvascular dysfunction, angiotensin II, plasma renin activity, reactive hyperemia, organ failure, septic shock, near-infrared spectroscopy, forearm ischemia
MeSH terms
Adult, Aged, Aged, 80 and over, Female, Humans, Male, Middle Aged, Prospective Studies, Renin-Angiotensin System, Case-Control Studies, Sepsis, Microvessels

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