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Intraoperative hypotension and 1-year mortality after noncardiac surgery

Jilles B Bijker1, Wilton A van Klei, Yvonne Vergouwe

  • 1Division of Perioperative Care and Emergency Medicine, Department of Anesthesiology, University Medical Center Utrecht, Utrecht, The Netherlands. j.b.bijker@umcutrecht.nl

Anesthesiology
|November 26, 2009
PubMed

Insights

Intraoperative hypotension (IOH) did not show a direct link to 1-year mortality in noncardiac surgery patients. However, prolonged IOH in elderly patients may increase mortality risk, with duration depending on blood pressure thresholds.

Area of Science:

  • Anesthesiology and Perioperative Medicine
  • Surgical Outcomes Research
  • Geriatric Medicine

Background:

  • Intraoperative hypotension (IOH) is a common complication during surgery.
  • A clear definition and consensus on IOH's impact on mortality are lacking.
  • IOH is suspected to be associated with adverse outcomes, including 1-year mortality.

Purpose of the Study:

  • To investigate the association between various definitions of intraoperative hypotension (IOH) and 1-year mortality after noncardiac surgery.
  • To explore the influence of different blood pressure thresholds and episode durations on mortality risk.
  • To identify specific patient populations, such as the elderly, who may be more vulnerable to IOH.

Main Methods:

  • A cohort study of 1,705 adult patients undergoing general and vascular surgery.
  • Data collected from electronic health records, including intraoperative blood pressure and confounding variables.
  • Statistical analyses included multivariable Cox proportional hazard regression and classification and regression tree (CART) analysis.
  • Mortality data tracked for up to 1 year post-surgery.

Main Results:

  • Overall 1-year mortality was 5.2% (88 patients).
  • Cox regression analysis revealed no significant association between IOH (across various definitions) and 1-year mortality after adjusting for confounders.
  • CART analysis identified IOH as a predictor of 1-year mortality specifically in elderly patients.
  • The duration of IOH associated with increased mortality risk in the elderly decreased as the blood pressure threshold for hypotension was lowered.

Conclusions:

  • No causal relationship was established between intraoperative hypotension (IOH) and 1-year mortality in the general surgical population, irrespective of the definition used.
  • For elderly patients, prolonged IOH appears to increase mortality risk, with the critical duration being dependent on the hypotension's severity (blood pressure threshold).
  • The findings suggest that the impact of IOH on mortality is complex and potentially population-specific, particularly in older adults.
  • Further research is needed to establish definitive lowest acceptable intraoperative blood pressure levels and their clinical implications.
Abstract

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