Optimizing systolic blood pressure strata remains a vital clinical objective for physicians managing acute heart failure. Recent evidence suggests that both low and high blood pressure levels significantly influence the development of acute kidney injury (AKI). Consequently, identifying the most protective range is essential for improving patient outcomes. A large-scale retrospective study recently investigated these associations to clarify the controversial relationship between perfusion pressure and renal safety.

The Impact of Systolic Blood Pressure Strata on AKI

Researchers analyzed data from over 19,000 heart failure patients within the MIMIC-IV database. They categorized these individuals into three distinct systolic blood pressure strata based on their first 24 hours in the intensive care unit. These groups included a strict stratum (under 110 mmHg), a standard stratum (110 to 140 mmHg), and a permissive stratum (over 140 mmHg). Furthermore, the analysis utilized the standard stratum as a reference to compare risk profiles accurately.

The study revealed a clear U-shaped relationship between blood pressure and renal dysfunction. Specifically, patients in the strict stratum faced a 34% higher risk of developing AKI compared to the standard group. However, high blood pressure also proved detrimental. Those in the permissive stratum showed a 28% increased risk of AKI. Therefore, maintaining a mean systolic blood pressure between 110 and 140 mmHg appear to offer the highest degree of renal protection during acute care.

Clinical Implications for Intensive Care

Clinicians must balance the need for adequate organ perfusion with the risks of hypertensive stress. This study highlights that mean blood pressure levels outside the 110-140 mmHg range independently predict AKI. In addition, the findings remained consistent across various sensitivity analyses. Practitioners should focus on achieving standard blood pressure targets to mitigate the incidence of kidney injury in vulnerable heart failure populations.

Frequently Asked Questions

What is the safest systolic blood pressure range to prevent AKI in heart failure?

The standard range of 110 to 140 mmHg is associated with the lowest risk of acute kidney injury in hospitalized heart failure patients.

Does high blood pressure increase the risk of kidney injury as much as low blood pressure?

Yes, the relationship is U-shaped. Both hypotension (under 110 mmHg) and hypertension (over 140 mmHg) significantly elevate the risk of AKI, though the risk is slightly higher in the hypotensive group.

How was the systolic blood pressure calculated in this study?

The researchers used the mean systolic blood pressure recorded during the first 24 hours of admission to the intensive care unit.

Disclaimer: This content is for informational and educational purposes only. It does not constitute medical advice or establish a doctor-patient relationship. Refer to the latest local and national guidelines for clinical practice.

References

Zeng Q et al. Systolic blood pressure strata and acute kidney injury risk in heart failure: a retrospective cohort study. BMC Cardiovasc Disord. 2026 Apr 13. doi: 10.1186/s12872-026-05840-7. PMID: 41975306.