Ultrasound-Guided Fascial Plane Blocks for Isolated Sternal Pain
For isolated sternal pain following trauma or sternotomy, perform an ultrasound-guided pectointercostal fascial plane block (PIFB) or superficial parasternal intercostal plane block (SPIP) bilaterally at the 2nd-6th intercostal spaces using 15-20 mL of 0.125-0.5% bupivacaine or ropivacaine per side. These superficial fascial plane blocks target the anterior cutaneous branches of the intercostal nerves and provide effective analgesia while avoiding the risks of deeper techniques 1, 2.
Why Fascial Plane Blocks Over Traditional Intercostal Blocks
The 2026 ASA guidelines specifically recommend fascial plane blocks (including pectointercostal and superficial parasternal intercostal plane blocks) for open cardiothoracic surgeries with sternotomy 1. Notably, the 2022 PROSPECT guidelines explicitly do not recommend traditional intercostal nerve blocks for thoracic procedures due to "lack of procedure-specific evidence" 3. This distinction is critical—fascial plane blocks have supplanted older intercostal techniques.
Technical Approach: PIFB vs SPIP
Superficial Parasternal Intercostal Plane Block (SPIP)
- Injection site: Between the pectoralis major muscle and external intercostal muscle, lateral to the sternum
- Dermatomal coverage: Anterior cutaneous branches of T2-T6 intercostal nerves
- Volume: 15 mL per side of 0.125-0.5% bupivacaine or ropivacaine
- Safety profile: Superficial approach with minimal pneumothorax risk 4
Pectointercostal Fascial Plane Block (PIFB)
- Injection site: Between pectoralis major and intercostal muscles at parasternal location
- Technique: Bilateral blocks at 2nd-6th intercostal spaces
- Evidence: Reduces pain scores significantly at rest and with deep breathing for 12-24 hours 2, 5
- Dosing: 15 mL of 0.125% bupivacaine per side provides effective analgesia without requiring adjuvants like clonidine 2
Deep vs Superficial Approach
A 2023 observational study directly compared superficial (SPIP) versus deep parasternal intercostal plane blocks (DPIP) 4. Both approaches provided equivalent analgesia and reduced opioid consumption compared to morphine alone, but the DPIP group experienced two pneumothoraces while the SPIP group had none. This safety differential strongly favors the superficial approach for routine use.
Timing and Duration
- Preemptive administration (before sternotomy/trauma) provides superior analgesia compared to postoperative blocks 5
- Single-shot blocks provide 12-24 hours of effective analgesia 6, 2, 5
- For prolonged pain beyond 24 hours, consider repeat blocks or transition to systemic multimodal analgesia
- For chronic post-sternotomy pain syndrome (>3 months), PIFB can provide 80% pain relief at 3-month follow-up 7
Clinical Outcomes
Studies consistently demonstrate:
- 50-85% reduction in opioid consumption in the first 24-48 hours 4, 2, 8
- NRS pain scores reduced by 2-3 points at rest and with deep breathing 2, 5
- Improved respiratory mechanics with higher peak expiratory flow rates 2
- Reduced rescue analgesia requirements 2, 5
- No increase in complications when performed with ultrasound guidance 4, 2
Critical Pitfalls to Avoid
- Do not perform traditional intercostal nerve blocks at the rib angle—these lack evidence and are not recommended by current guidelines 3
- Avoid deep parasternal blocks unless you have specific expertise—the superficial approach is equally effective with better safety 4
- Do not add clonidine as an adjuvant—it provides no additional benefit 2
- Ensure bilateral coverage—unilateral blocks are insufficient for midline sternal pain 2, 5
Integration with Multimodal Analgesia
These blocks should be part of a comprehensive strategy including:
- Scheduled acetaminophen 1 gram every 8 hours
- NSAIDs (if not contraindicated)
- Tramadol or low-dose opioids for breakthrough pain
- Early mobilization and respiratory physiotherapy
The 2026 ASA guidelines emphasize that regional analgesia is a "key component of an optimal multimodal analgesia regimen" and should be procedure-specific 1. For sternal pain, fascial plane blocks represent the current standard of care.