BP03 involves avoiding intraoperative hypotension defined by a MAP of less than 65. The success definition is
avoiding a period of greater than 15 minutes below that number. The intent is to capture signals of broad
hypotension.
Contrast that with BP01 and BP06, which are both focused on preventing severe hypotension intraoperatively at
a MAP defined as less than 55. For BP01, success is defined as avoiding more than 20 minutes below 55; for
BP06, more than 10 minutes.
Exclusions common to all three measures include: children, ASA 5–6, baseline MAP less than 60, labor epidurals,
liver and lung transplant, and some cardiac procedures. The time period defined is from anesthesia start to
patient out of room.
The imperative to prevent significant intraoperative hypotension remains. Our analysis of recent literature since
the last measure review has not changed that. There is a growing body of evidence that intraoperative
hypotension is associated with significant postoperative outcomes, including cerebrovascular events, MACE, and
AKI, among others. Even though there have not been large trials demonstrating a causal association, the
association is there, and the importance of these hypotension measures has not changed.
Two considerations came up in my literature review. The first: is 65 the right target for intraoperative blood
pressure? The Perioperative Quality Initiative (POQI) met in Europe and in 2024 published a consensus
statement suggesting that the intraoperative goal for anesthesiologists should be a MAP above 60. The question
is: should we change our target from 65 to 60?
Part of their rationale was that several trials published in recent years compared higher targets to a lower target
of 60. One large single-center trial found no difference in composite outcomes — including acute MI, AKI, and
MACE — whether the intraoperative target was MAP 75 or 60. The POISE-3 trial similarly compared MAP targets
of 80 and 60 and found no difference in similar outcomes.
When you read through the POQI recommendations, they acknowledge there is not really high-quality evidence
to specify the exact lower number for an intraoperative target. In the absence of compelling evidence, 65 still
remains a reasonable goal, and I am not sure there is enough signal from the literature to lower it further.
In the ICU literature, the '65 Trial' looked at patients with septic shock comparing MAP targets of 65 versus 60
and did not find a difference in mortality. However, there was substantial non-adherence — patients
randomized to the 60 arm ended up practically at a higher MAP — so I do not think there is enough evidence
from that to shift to a lower number either.
Taken together: there is still a growing body of evidence that intraoperative hypotension is associated with
adverse outcomes. There are some signals and recommendations that 60 might be a reasonable target, but
probably not enough to change the metric. The 15-minute threshold also remains valid — a 2017 trial suggested
that adverse outcomes were associated with approximately 13 minutes at a MAP less than 65, so 15 minutes as
a round number remains reasonable.
The second consideration: should we add additional procedures to the exclusions for BP03? I raise this because
at my institution, our regional team had received some complaints — for certain orthopedic procedures like
total hips and knees, we often target a low-normal blood pressure to improve visualization and surgical
technique. For patients without risk factors such as cerebrovascular, cardiac, or renal disease, we might target a
MAP in the 60–65 range, and these patients get flagged as failing the metric when the approach was deliberate.
Looking at the literature: two meta-analyses from BJA (Damoco and Doderman) demonstrated efficacy and
benefit from lower MAP targets in terms of surgical technique — reduced blood loss, reduced transfusion
requirements, decreased surgical time, and in some cases decreased hospital length of stay. However, neither
was able to demonstrate a positive or negative association with adverse postoperative outcomes. Zhang et al.
did a retrospective cohort study of about 200 patients and found that TXA combined with a MAP of 70–80 was
associated with decreased surgical duration and blood loss without demonstrating adverse safety outcomes.
The Jang systematic review and meta-analysis also demonstrated surgical benefit but was underpowered, and
studies were too heterogeneous to evaluate the impact on safety outcomes. Similar findings come from the
OMFS and ENT literature. In the trauma literature, there is substantial evidence that during the early
resuscitative phase for hemorrhagic trauma, targeting a lower blood pressure actually has a mortality benefit.