Saudi Journal of Anaesthesia

LETTERS TO EDITOR
Year
: 2020  |  Volume : 14  |  Issue : 4  |  Page : 557--559

Spread of local anesthetic after thoracic erector spinae and thoracic paravertebral block in patients with multiple posterolateral rib fractures


Sandeep Diwan1, Abhijit Nair2,  
1 Department of Anaesthesiology, Sancheti Hospital, Pune, Maharashtra, India
2 Department of Anaesthesiology, Basavatarakam Indo-American Cancer Hospital and Research Institute, Hyderabad, Telangana, India

Correspondence Address:
Dr. Abhijit Nair
Department of Anaesthesiology, Basavatarakam Indo-American Cancer Hospital and Research Institute, Hyderabad - 500 034, Telangana
India




How to cite this article:
Diwan S, Nair A. Spread of local anesthetic after thoracic erector spinae and thoracic paravertebral block in patients with multiple posterolateral rib fractures.Saudi J Anaesth 2020;14:557-559


How to cite this URL:
Diwan S, Nair A. Spread of local anesthetic after thoracic erector spinae and thoracic paravertebral block in patients with multiple posterolateral rib fractures. Saudi J Anaesth [serial online] 2020 [cited 2021 Jan 27 ];14:557-559
Available from: https://www.saudija.org/text.asp?2020/14/4/557/295994


Full Text



Sir,

Several regional anesthesia techniques are used in clinical practice to offer pain relief in patients who sustain multiple posterolateral ribs fractures (MPLRF) as a result of polytrauma. Each technique has its advantages and offers reasonable pain relief, reduces the worsening of acute lung injury as a result of hypoventilation, facilitates chest physiotherapy, and reduces the overall cost of treatment. Continuous thoracic paravertebral block (ThPVB) and thoracic epidural analgesia (TEA) has been used for years successfully in managing such situations.[1],[2] TEA is contraindicated in patients with suspected spinal cord injury under evaluation and coagulopathies. ThPVBs do not act in the presence of hemorrhage in thoracic paravertebral space (PVS) secondary to posterior rib fractures. An alternative recently incorporated in pain relief for rib fracture management is ultrasound (US)-guided serratus anterior plane block (SAPB).[3] However, SAPB is restricted for lateral rib fractures. Recently, the thoracic erector spinae plane block (ESPB) has been used successfully in managing pain due to multiple rib fractures.[4] ESPBs act particularly on dorsal rami, and, in the case of MPLRFs, single injection followed by catheter infusion acts at multiple levels. Here, we have described using eight images the pattern of contrast spread of LA during a continuous ThPVB and a continuous ESPB at the thoracic level. Informed consent was obtained from patients prior to administering the block, for contrast-enhanced computed tomography (CT) studies and for using the images in a scientific journal. A waiver was offered for CT contrast studies. Continuous blocks were performed in four patients (two ThPVB and two thoracic ESPB) who sustained MPLRF. There were no major bone fractures, abdominal or head injury, and had a Glasgow Coma Scale of 15/15 on admission to the intensive care unit. The US-guided ThPVB was performed by the intercostal approach [5] and US-guided ESPB was performed deep to erector spinae muscle (ESM). A linear array, a high-frequency US probe (13-6 MHz, Sonosite Inc.) was used for the blocks.

At 12 h after achieving a visual analog scale (VAS) of less than 4, a CT contrast study was performed by injecting 5 mL of radio-opaque contrast diluted with 0.9% 20 mL normal saline (a volume of 25 mL) through an indwelling catheter in the ESP. Through the paravertebral catheter, 5 mL of radio-opaque contrast diluted with 0.9% 20 mL normal saline (a volume of 25 mL) was injected. The images were reported by a consultant radiologist.

On reviewing CT contrast images of thoracic ESPB patients, the axial section revealed the contrast flow from deep to ESM into the PVS at two levels but no contrast in the epidural space in all planes. The contrast did appear in the PVS in the coronal and the sagittal sections [Figure 1].{Figure 1}

In the ThPVB, the spread was visualized in the anterior and posterior epidural space in the axial section in the first patient. In the second patient, in the coronal section, the contrast was lateralized in the epidural space. In both patients, the contrast had traveled across the three thoracic intervertebral foramina in the axial and coronal sections [Figure 2].{Figure 2}

The ESPB is a dorsal rami block. Extensive spread and block can occur as a result of LA spread across the ESP. Cadaveric and radiocontrast studies depict a dorsal and a ventral spread into the PVS.[6],[7] In our case series, the spread from the ESPB was in the thoracic PVS in both the patients at the level of T5.

To conclude, the pain relief offered by a thoracic ESPB in a patient with MPLRF is due to the paravertebral spread of LA and an occasional epidural spread. Dense blocks from injections into the thoracic PVS results from blockade of motor, sensory and sympathetic nerves in the PVS and a simultaneous spread into the epidural space.

Financial support and sponsorship

Nil.

Conflicts of interest

There are no conflicts of interest.

References

1Peek J, Smeeing DPJ, Hietbrink F, Houwert RM, Marsman M, de Jong MB. Comparison of analgesic interventions for traumatic rib fractures: A systematic review and meta-analysis. Eur J Trauma Emerg Surg 2019;45:597-622.
2Womack J, Pearson JD, Walker IA, Stephens NM, Goodman BA. Safety, complications and clinical outcome after ultrasound-guided paravertebral catheter insertion for rib fracture analgesia: A single-centre retrospective observational study. Anaesthesia 2019;74:594-601.
3Durant E, Dixon B, Luftig J, Mantuani D, Herring A. Ultrasound-guided serratus plane block for ED rib fracture pain control. Am J Emerg Med 2017;35:197.e3-e6.
4Luftig J, Mantuani D, Herring AA, Dixon B, Clattenburg E, Nagdev A. Successful emergency pain control for posterior rib fractures with ultrasound-guided erector spinae plane block. Am J Emerg Med 2018;36:1391-6.
5Shibata Y, Nishiwaki K. Ultrasound-guided intercostal approach to thoracic paravertebral block. Anesth Analg 2009;109:996-7.
6Diwan S, Garud R, Nair A. Thoracic paravertebral and erector spinae plane block: A cadaveric study demonstrating different site of injections and similar destinations. Saudi J Anaesth 2019;13:399-401.
7Diwan S, Nair A. Is paravertebral-epidural spread the underlying mechanism of action of erector spinae plane block? Turk J Anaesthesiol Reanim 2019;48:86-7.