Blood Pressure Measurement in Patients with Pacemakers and Breast Cancer History
You CAN measure blood pressure on the left arm in patients with both a left-sided pacemaker and history of left breast cancer, unless there is lymphedema present. The traditional prohibition is not evidence-based and can lead to inaccurate measurements and unnecessary complications.
The Two Separate Concerns
Pacemaker Consideration
There is no contraindication to measuring blood pressure on the arm with a pacemaker. The concern about pacemakers relates to mammography imaging quality, not blood pressure measurement 1. The pacemaker does not interfere with blood pressure cuff function or pose any risk during BP measurement.
Breast Cancer/Mastectomy Consideration
Blood pressure can be measured in both arms after mastectomy unless lymphedema is present 2. This is the only evidence-based contraindication from the American Heart Association guidelines.
The traditional blanket prohibition against using the ipsilateral arm after breast cancer surgery is not supported by evidence:
- A recent practice change study involving over 100 patients with breast cancer and lymph node involvement showed zero incidences of resulting lymphedema when the ipsilateral arm was used for blood pressure, phlebotomy, and IV access 3
- Multiple studies confirm these precautions are based on tradition rather than evidence-based medicine 4, 5
- A small audit found no patients developed swelling within a month of procedures on the at-risk arm 6
Clinical Algorithm
Step 1: Check for lymphedema
- If lymphedema present → Use contralateral arm
- If no lymphedema → Either arm is acceptable
Step 2: Ensure proper technique regardless of arm chosen
- Support arm at heart level (midsternum/4th intercostal space when sitting) 2
- Avoid lap or side positions, which overestimate readings by 4-6.5 mm Hg systolic 7
- Use appropriate cuff size
Common Pitfall to Avoid
The outdated practice of blanket forbidding ipsilateral arm use leads to:
- Inaccurate calf blood pressure measurements
- Unnecessary foot stick blood draws
- Increased need for tunneled central venous catheters 3
These alternatives are more invasive and less accurate than simply using the ipsilateral arm when appropriate.
When both arms are available (no lymphedema), check both arms at the first examination and use the arm with consistently higher readings for subsequent measurements 2.