Where should blood pressure be measured when all extremities are burned?

Blood Pressure Measurement in Patients with Burns to All Extremities

When all extremities are burned, blood pressure should be measured using an oscillometric automatic blood pressure monitor with the cuff placed proximally over bulky bandages on the least severely burned extremity, as this has been validated as sufficiently accurate for clinical management without requiring invasive arterial monitoring.

Primary Approach: Non-Invasive Monitoring Over Bandages

The most practical and validated approach is to use automatic oscillometric blood pressure monitors with cuffs applied over the bandaged extremities 1. Research specifically examining burned patients demonstrates that:

• Proximal limb cuff placement over bulky bandages provides sufficiently accurate measurements for clinical decision-making
• This technique allows blood pressure monitoring where it would otherwise be impossible without invasive methods
• The accuracy is adequate to guide burns management 1

Technique Considerations

When applying this method:

• Choose the least severely burned extremity if severity varies
• Place the cuff as proximally as possible on the limb
• Use an appropriately sized cuff that can accommodate the bandages
• Ensure the bladder center is positioned over the artery despite the bandaging 2

Alternative Sites When Extremities Are Unusable

If non-invasive measurement over bandaged extremities is truly impossible or unreliable:

Thigh Measurement

The thigh can serve as an alternative site, with acceptable agreement between invasive and non-invasive measurements in the semi-sitting position 3. However, be aware that:

• Systolic blood pressure readings from the thigh may run slightly higher than brachial readings
• Agreement is better than ankle measurements 3

Invasive Arterial Monitoring

When non-invasive methods fail or critical accuracy is required:

• Central intra-arterial blood pressure monitoring becomes necessary 2
• This provides a gold standard measurement
• Can establish a differential correction factor if non-invasive methods are later attempted 2

Common Pitfalls to Avoid

• Do not assume you need invasive monitoring immediately - try oscillometric devices over bandages first 1
• Avoid ankle measurements - these show the worst agreement with invasive measurements and should be a last resort 3
• Do not use undersized cuffs - ensure adequate cuff size even when accommodating bandages 2

Clinical Algorithm

1. First-line: Apply oscillometric automatic BP monitor proximally over bandaged extremity (least burned if applicable)
2. If inadequate: Try thigh measurement with appropriately sized cuff
3. If still inadequate: Proceed to invasive arterial line placement for accurate hemodynamic monitoring

This stepwise approach balances the need for accurate blood pressure monitoring with the practical realities of managing severely burned patients, avoiding unnecessary invasive procedures when validated non-invasive alternatives exist 1.