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#415 Blood Pressure Measurement Technique: Meaningful mistakes or minor details?


CLINICAL QUESTION
QUESTION CLINIQUE
 Does following recommended blood pressure measurement techniques impact the accuracy of readings?

BOTTOM LINE
RÉSULTAT FINAL
 Cuff size, arm position, bladder distention, and leg crossing meaningfully affect systolic and diastolic blood pressure measurement accuracy from ~1 mmHg lower to 20 higher. Measuring over thin clothing does not impact readings.  Consider a five-minute rest before measurement as rest may give more accurate readings if blood pressure 140mmHg systolic. Following Hypertension Canada’s measurement technique recommendations is reasonable to obtain accurate readings. 


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EVIDENCE
DONNÉES PROBANTES
  • Results statistically significant unless otherwise stated.
  • One systematic review.1 Reporting larger, higher quality randomized crossover trials due to methodological limitations.
  • Cuff size (195 patients). Compared to appropriate cuff size: 2
    • Using too-large cuff:
      • Small arm using regular-sized cuff: -3.6mmHg systolic blood pressure (SBP), -1.3mmHg diastolic blood pressure (DBP).
    • Using too-small cuff:
      • Large arm using regular-sized cuff: +4.8mmHg (SBP), +1.8mmHg (DBP).
      • Extra-large arm using regular-sized cuff: +19.5mmHg (SBP), +7.4mmHg (DBP).
  • Arm position: Arm supported at heart level, hand on lap, or arm hanging at side (133 patients).3
    • Lap versus supported: +3.9mmHg (SBP), +4.0mmHg (DBP).
    • Side versus supported: +6.5mmHg (SBP), +4.4mmHg (DBP).
  • Leg position (111 patients):4
    • Crossed legs at knee versus feet on ground: +3 to 8mmHg (SBP), +2mmHg (DBP).
    • Crossed legs at ankles: No difference.
  • Rest period (113 patients):5
    • No rest versus 5-minute rest:
      • Patients with SBP <140mmHg: No meaningful difference.
      • SBP >140mmHg: Inconsistent; ranged from no effect to
  • Clothing (201 participants):6 No difference between thin-sleeved (< 2mm) and bare-arm measurements.
  • Bladder (172 women; ultrasound-confirmed full bladder; not randomized):7
    • Full bladder versus empty: +4.2mmHg (SBP), +2.8mmHg (DBP).
  • Talking: May raise SBP between 4-19mmHg, but suboptimal randomization processes used.8-11
  • Environment: No difference between quiet private and noisy public environments.12
CONTEXT
CONTEXTE
  • 5mmHg reduction in SBP reduces major cardiovascular events by ~10%, suggesting small measurement errors may be clinically meaningful.13
  • Hypertension Canada’s recommended measurement techniques14 align with protocols used in landmark hypertension trials.
  • Automated office and home measurements using standardized techniques correlate more closely with awake ambulatory measurement than manual office readings.15
  • Guidelines recommend validated, automated devices for measurement.14

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Author(s)
Auteur(s)
  • Tony Nickonchuk BSc Pharm
  • Adrienne J Lindblad BSP ACPR PharmD
  • Scott Garrison MD CCFP
  • Danielle Perry RN MSc

1. Kallioinen N, Hill A, Horswill MS, et al. Journal of Hypertension. 2017;35(3): 421–41.

2. Ishigami J, Charleston J, Miller ER, et al. JAMA Intern Med. 2023;183(10): 1061.

3. Liu H, Zhao D, Sabit A, et al. JAMA Intern Med. 2024;184(12): 1436.

4. Adiyaman A, Tosun N, Elving LD, et al. Blood Pressure Monitoring. 2007;12(3): 189–93.

5. Brady TM, Charleston J, Ishigami J, et al. Hypertension. 2021;78(5): 1511-19.

6. Liebl M, Holzgreve H, Schulz M, et al. Blood Pressure. 2004;13(5): 279–82.

7. Choi EJ, Jeong DW, Lee JG, et al. Korean J Fam Med. 2011;32(5): 306.

8. Zheng D, Giovanni R, Murray A. J Hum Hypertens. 2012;26: 458-62.

9. Le Pailleur C, Montgermont P, Feder JM, et al. Behav Med. 2001;26: 149-57.

10. Le Pailleur C, Vacheron A, Landais P, et al. Behav Med. 1996;22: 114-22.

11. Liehr P. Arch Psychiatr Nurs. 1992;6: 306-11.

12. Ishigami J, Liu H, Zhao D, et al. Ann Intern Med. 2025;178(2): 149–56.

13. Rahimi K, Bidel Z, Nazarzadeh M, et al. The Lancet. 2021;397(10285): 1625–36.

14. Goupil R, Tsuyuki RT, Santesso N, et al. CMAJ. 2025;197(20): E549–64.

15. Roerecke M, Kaczorowski J, Myers MG. JAMA Intern Med. 2019;179(3): 351.

Authors have no conflicts of interest to declare.