Can an arterial line be placed on the same side as a mastectomy?

Can an Arterial Line Be Placed on the Mastectomy Side?

Yes, arterial line placement on the mastectomy side is not contraindicated for short-term use, though you should avoid the ipsilateral arm if there is established lymphedema or if peripherally inserted central catheters (PICCs) or axillary/subclavian access is planned.

Guideline-Based Recommendations

The most recent 2025 Association of Anaesthetists guidelines explicitly address this question 1. Mastectomy and axillary lymph node resection are NOT considered absolute contraindications for short-term ipsilateral vein cannulation 1. However, the guidelines make an important distinction:

• Acceptable for short-term access: Standard peripheral IV cannulation and arterial lines
• Should be avoided: PICC insertion and axillary/subclavian vein cannulation in arms at risk or with evidence of lymphedema 1

Clinical Algorithm for Decision-Making

When considering ipsilateral arterial line placement after mastectomy, assess:

1. Presence of lymphedema: If present → avoid ipsilateral access
2. Duration of access needed: Short-term (hours to days) → acceptable; long-term → consider alternatives
3. Type of access: Arterial line or peripheral IV → acceptable; PICC or central line → avoid
4. Alternative sites available: If contralateral arm readily accessible → may prefer this to minimize any theoretical risk

Supporting Evidence

Multiple research studies support the safety of ipsilateral vascular access in mastectomy patients:

• A large retrospective study of 7,896 IV placements in breast cancer surgery patients found no significant difference in complication rates between ipsilateral (3.9 per 10,000) and contralateral (7.3 per 10,000) IV placement 2
• Studies of central venous ports showed no difference in complications or lymphedema rates between ipsilateral and contralateral placement 3, 4
• The evidence challenges the traditional dogma that all ipsilateral access must be avoided 5

Important Caveats

The key distinction is between short-term peripheral access (including arterial lines) versus long-term central access. While arterial lines are acceptable, you should:

• Document the clinical rationale if choosing ipsilateral placement
• Monitor for any signs of swelling or venous congestion
• Consider contralateral placement if equally accessible and the patient has had extensive axillary lymph node dissection
• Absolutely avoid ipsilateral PICC lines or subclavian/axillary central lines, as these carry higher risk of central venous stenosis that could compromise long-term vein health 1

The traditional blanket prohibition against any ipsilateral access after mastectomy is not evidence-based for short-term arterial lines 1, 2. The 2025 guidelines represent an important shift toward more nuanced, evidence-informed practice that balances theoretical risks against practical clinical needs.