Is it better to have high or low pulse pressure when you have septic shock?

Pulse pressure is the difference between your systolic (top) and diastolic (bottom) blood pressure numbers. In septic shock, blood vessels widen and leak fluid, making it hard to maintain stable blood pressure. Doctors often use medicines to raise blood pressure, but the ideal pulse pressure range is not always clear. A 2024 study found that keeping pulse pressure between 40 and 70 mmHg during the first day in the ICU was linked to better survival. Both too low and too high pulse pressure were tied to higher risk of death.

What the research says

A retrospective study of septic shock patients from the MIMIC-IV database and a Chinese hospital found that the average pulse pressure over the first 24 hours (PP24h) was a strong predictor of 28-day survival ⁶. Patients whose PP24h stayed between 40 and 70 mmHg had significantly higher survival rates ⁶. The study used statistical methods to account for other factors, and the finding held up in a separate group of patients ⁶. Importantly, age played a role: in patients over 65, the relationship between pulse pressure and mortality was different, suggesting that older patients may need a more personalized approach ⁶.

Other research supports the idea that blood pressure management in septic shock is complex. One study found that early use of norepinephrine (a vasopressor) can help stabilize blood pressure and may reduce fluid needs and improve survival ¹⁰. However, another trial showed that a device called CytoSorb, which removes inflammatory molecules from the blood, did not help and even increased the need for vasopressors ⁸. This highlights that simply raising blood pressure is not enough; the right balance matters.

While the pulse pressure study ⁶ is the most direct evidence on this question, it is a retrospective analysis, meaning it looks back at medical records rather than testing a treatment in a controlled trial. This type of study can suggest associations but cannot prove cause and effect. Other sources in this set do not directly address pulse pressure targets, but they emphasize the importance of careful monitoring and individualized care in septic shock ⁹¹⁰.

What to ask your doctor

• What pulse pressure range should I aim for during the first 24 hours of septic shock treatment?
• Does my age or other health conditions change the ideal pulse pressure target for me?
• How will my care team monitor and adjust my blood pressure medications to keep pulse pressure in a safe range?
• Are there any risks if my pulse pressure goes too low or too high during treatment?
• Should I be concerned about other factors, like fluid balance or vasopressor timing, that might affect my pulse pressure?