What mean arterial pressure (MAP) should be targeted in the first 5–7 days after a traumatic spinal cord injury?

Mean Arterial Pressure Target in Acute Spinal Cord Injury

Maintain a mean arterial pressure (MAP) of at least 70 mmHg during the first 5-7 days after traumatic spinal cord injury, while avoiding hypotension (SBP <90 mmHg), though the evidence for higher targets (85-90 mmHg) is insufficient and may cause harm.

Evidence-Based Recommendation

The French guidelines explicitly recommend maintaining MAP ≥70 mmHg during the first week to limit worsening of neurological deficit 1. This recommendation is based on:

• A small retrospective study (n=17) showing correlation between time spent with MAP <65-70 mmHg and worse neurological improvement
• A study of 92 patients demonstrating that spinal cord perfusion pressure >50 mmHg (corresponding to MAP >70 mmHg) correlated with better 6-month neurological outcomes
• The critical finding that this correlation disappeared at higher MAP thresholds (75,80, or 85 mmHg)

The Higher Target Controversy

While American guidelines (AANS/CNS) suggest targeting MAP >85 mmHg for days 5-7, the French guidelines note this recommendation is based on only two prospective studies without control groups 1. The evidence explicitly states there is insufficient evidence to recommend MAP >70 mmHg.

Most importantly, the highest quality and most recent evidence contradicts aggressive MAP augmentation:

• A 2025 multicenter randomized trial of 92 patients found no neurological benefit from augmented MAP (85-90 mmHg) versus conventional targets (65-70 mmHg) at 6 months 2
• The augmented group experienced significantly more harm: higher organ dysfunction scores, 5.67 more days of mechanical ventilation, and 40% higher rate of respiratory complications 2
• A 2026 meta-analysis of 3,535 patients found no difference in neurological improvement between standard and augmented MAP targets, but significantly more respiratory complications with augmentation 3

Practical Implementation Algorithm

Days 0-7 post-injury:

1. Avoid all hypotensive episodes (SBP <90 mmHg) - this is strongly associated with mortality 1
2. Target MAP ≥70 mmHg as the evidence-supported threshold
3. Use continuous arterial line monitoring - studies show MAP falls below target 25% of the time even with aggressive management 1
4. First-line vasopressor: norepinephrine - reliably raises MAP with fewer adverse effects 4
5. Consider oral midodrine - protective against adverse drug reactions compared to continuous vasopressors 5

Duration considerations:

• The correlation between MAP and neurological improvement exists primarily for 2-3 days after admission, not the full week 1
• Patients not requiring vasopressors within the first 2-3 days are unlikely to need them subsequently 6

Critical Caveats

Do not routinely escalate to MAP 85-90 mmHg based on the 2025 RCT showing harm without benefit 2. The older recommendation for supra-physiological targets was based on weak evidence (uncontrolled studies) and has now been contradicted by higher-quality data.

Pre-hospital phase: Maintain SBP >110 mmHg before injury assessment to reduce mortality 1 - this is a separate, well-supported recommendation.

Advanced monitoring: In specialized centers, spinal cord perfusion pressure (SCPP) monitoring via lumbar drain targeting SCPP >50-65 mmHg may provide more precise guidance than MAP alone 4, 7, but this requires specific expertise and infrastructure.

The Bottom Line

The evidence has evolved. Aim for MAP ≥70 mmHg, not 85-90 mmHg. Higher targets increase complications without improving neurological recovery. Focus on avoiding hypotension rather than achieving supra-physiological pressures.