Pulse Pressure Range 40–70 mmHg Linked to Lower Mortality in Septic Shock

Overview

This retrospective cohort study found that maintaining pulse pressure (PP) between 40 and 70 mmHg during the first 24 hours of ICU admission is associated with significantly lower 28-day mortality in septic shock patients. Age modifies this relationship, with high PP (>70 mmHg) increasing mortality risk in elderly patients and low PP (<40 mmHg) increasing risk in younger patients.

Background

Septic shock is a severe form of sepsis characterized by persistent hypotension requiring vasoactive support despite fluid resuscitation, with high associated mortality rates globally. Traditional hemodynamic targets focus on mean arterial pressure (MAP) ≥ 65 mmHg, but this may not fully capture circulatory status. Pulse pressure (PP), the difference between systolic and diastolic blood pressure, reflects cardiac output and arterial compliance and may provide additional prognostic information. However, limited research has explored optimal PP ranges in septic shock, and the relationship between PP and mortality is likely non-linear.

Data Highlights

Key Findings

• Maintaining PP24h between 40 and 70 mmHg is associated with significantly higher survival in septic shock patients.
• Age modifies the PP-mortality relationship: elderly patients (>65 years) have highest mortality with PP24h > 70 mmHg.
• Younger patients (≤65 years) have highest mortality risk when PP24h < 40 mmHg.
• Both low (<40 mmHg) and high (>70 mmHg) PP24h are independent risk factors for 28-day mortality after adjusting for confounders.
• Propensity score matching and multivariate logistic regression confirmed these associations.
• Findings were validated using an external clinical cohort from a tertiary hospital in China.

Clinical Implications

Clinicians managing septic shock should consider targeting a pulse pressure range of 40 to 70 mmHg during early resuscitation to optimize survival outcomes. Hemodynamic management may need to be individualized by age, avoiding high PP in elderly patients and low PP in younger patients. These findings suggest that PP monitoring could complement MAP targets to better guide circulatory support.

Conclusion

This study identifies an optimal pulse pressure range of 40–70 mmHg associated with improved 28-day survival in septic shock, with age-specific risk profiles for deviations outside this range. Future prospective studies are warranted to validate these findings and inform tailored hemodynamic strategies.

References

1. Sepsis-3 Definitions (Singer et al., 2016) -- The Third International Consensus Definitions for Sepsis and Septic Shock
2. MIMIC-IV Database -- Medical Information Mart for Intensive Care
3. X-tile Software (Camp et al., 2004) -- Bioinformatics Tool for Biomarker Cutoff Optimization
4. Anhui Medical University Clinical Data (2021-2024) -- Septic Shock Patient Cohort