The edition · Anaesthesiology
The Hypotension Prediction Index did not beat a simple MAP trigger of 73 mmHg
A two-centre randomised trial found no significant difference in intraoperative hypotension between predictive-algorithm and higher-threshold management. Plus low end-tidal CO₂ and mortality, a fentanyl infusion bag recall, extended-release opioids after joint replacement, and what lies behind postoperative hoarseness.
The edition in brief
In a two-centre open-label trial of 100 adults having major noncardiac surgery with arterial lines, treating when the Hypotension Prediction Index reached 85 was not superior to treating when mean arterial pressure fell to 73 mmHg: time-weighted hypotension was 0.07 versus 0.16 mmHg (P = 0.12), with no difference in vasopressor dose, stay or mortality. The trial was not designed to show equivalence. In 185,455 French surgical patients, each 5 mmHg fall in mean end-tidal CO₂ below the median was associated with higher in-hospital mortality (aOR 1.63), independent of hypotension and minute ventilation. The FDA lists a Class II recall of a US-distributed fentanyl citrate infusion bag for an expiry-date labelling discrepancy. In 258,624 Ontario arthroplasty patients, filling a new extended-release opioid prescription was associated with slightly more persistent opioid use (aOR 1.08) and emergency visits. In 676,641 anaesthetics, hoarseness needing ENT referral occurred in about 1.5 per 1,000, most strongly linked to nasogastric tubes.
Low end-tidal CO₂ was linked to higher mortality, independent of hypotension
Treat sustained low end-tidal CO₂ as a haemodynamic warning, not only a ventilation setting.
FDA Class II recall: fentanyl citrate infusion bags with conflicting expiry dates
Check all expiry dates on premixed opioid infusions and quarantine any bag whose labels disagree.
Extended-release opioids after joint replacement: slightly more persistent use
Avoid new extended-release opioids at discharge after joint replacement; use short-course immediate-release opioids with non-opioid analgesia.
Nasogastric tubes were the strongest link to hoarseness needing ENT review
Refer persistent postoperative hoarseness to ENT within the first week, especially after nasogastric tubes or TOE.
Clear fluids up to two hours before elective anaesthesia
Give a clear two-hour fluid cut-off rather than nil by mouth from midnight, adjusting for patients with delayed gastric emptying.
Predictive hypotension algorithm was not superior to treating at MAP 73 mmHg
Consider a proactive mean arterial pressure trigger of about 73 mmHg; the predictive index was not shown to do better.
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