1. Cuff Placement
* Cuff lower edge 2-3 cm above the elbow crease: Wrap the cuff around the bare upper arm, ensuring the lower edge of the cuff is approximately two fingers' width (2-3 cm) above the elbow crease.
* Air bladder aligned with the brachial artery: The cuff usually has an arrow or air bladder indicator, which should be aligned with the brachial artery on the inner side of the arm (inner 1/3 of the arm).
* Level with the heart: During measurement, the center of the cuff should be at the same level as the heart, whether sitting or lying down.
2. Cuff Tightness
* Tightness standard: After fastening the cuff, you should be able to easily insert 1-2 fingers underneath. Too tight will result in a lower blood pressure reading, while too loose will result in a higher reading.
* Avoiding errors: An overly tight or loose cuff is a common reason for large fluctuations in home blood pressure measurements; pay special attention to consistent tightness.
3. Measurement Posture
* Arm support: During measurement, the arm should be placed flat on a table, palm facing upwards, with the elbow slightly bent, ensuring the cuff is at the same level as the heart.
* Body relaxation: Sit in a chair with a backrest, feet flat on the floor, back straight, avoiding crossing your legs or letting your arm hang freely.
4. Other Considerations
* Cuff size: Choose the appropriate cuff size according to your upper arm circumference. Standard cuffs are suitable for arm circumferences of 22-32 cm; those with larger arm circumferences require an extended cuff.
* Regular calibration: Electronic blood pressure monitors are recommended to be calibrated every 1-2 years to ensure accuracy.
