Estimated Systolic Pressure From Palpable Radial Pulse
Palpation of a radial pulse is classically taught to indicate a systolic arterial pressure (SBP) of >80 mmHg. [1] This estimate originates from Advanced Trauma Life Support (ATLS)-based palpation guidance. [1]
Palpation Thresholds Used in ATLS
ATLS palpation-based SBP estimates use the following pulse findings: [1]
- Carotid pulse palpable only: SBP 60–70 mmHg. [1]
- Carotid and femoral pulses palpable: SBP 70–80 mmHg. [1]
- Radial pulse palpable (in addition to more proximal pulses): SBP >80 mmHg. [1]
Evidence Supporting the Association
The ATLS teaching rule for pulse-to-SBP estimation has been studied in observational cohorts and is described in the literature as overestimating true SBP in many patients. [2] Accuracy concerns have been reported when comparing ATLS-predicted SBP ranges with measured SBP. [2]
Clinical Interpretation of “Palpable Radial Pulse”
Palpable radial pulse presence should be treated as a rough SBP approximation, not a precise measurement. [2] The association is affected by patient factors that influence pulse strength and detectability. [2]
Practical Clinical Use
Palpation-based SBP estimation is used when rapid estimation is needed and a manual cuff measurement is not immediately available. [1] Definitive SBP measurement with a cuff should replace palpation-based estimates when feasible. [1]
Key Caveats
The ATLS pulse-to-SBP thresholds are not reliably exact in real-world performance and can systematically overestimate SBP. [2] Clinical decisions should not rely on palpation alone when measured blood pressure is obtainable. [2]