Trick of the trade: Single digital block

Sep 29, 10
Trick of the trade: Single digital block

DigitalDorsalInjectionYour next ED chart: Finger injury

The finger needs to be anesthetized.

Patient: “I have had this freezing before. The needles really hurt! Is there anything else less painful? “

Trick of the Trade

A single, subcutaneous, volar-approach digital block

DigitalVolarInjection

The traditional ring block involves two injections at the base of the finger (and a third injection if anesthetizing the thumbs and toes). A recent article adds to the literature on a non-traditional approach to the digital block – the single subcutaneous method.

Where do we inject?

Midpoint of the crease where the finger joins the palm, on the volar side.

How deep is the injection?

Subcutaneously. The anesthetic will deposit on top of the tendon sheath and infiltrate to where the digital nerves are.

How much volume?

About 2-3 cc.

Study results

How effective is this volar subcutaneous approach?

It is just as good as the traditional multiple-stick, dorsal approach. In this study at 5 minutes, 76% (28/37) patients in the single injection group were adequately anesthetised compared to 65% (22/34) patients in the traditional block (p=0.436, no statistically significant difference).

Also there were no differences in anesthesia at 10 minutes.

Is this less painful?

The self reported pain score was less, but again the difference was NOT statistically significant.

Do clinicians like this better?

Yes, the difference in Clinician Satisfaction score WAS statistically significant. In fact, many study clinicians adopted the single injection method, making recruitment of the trial subjects difficult.

What is my experience?

I really like this method since patients seem to tolerate this better. However, it does not work as well for the thumb, probably due to the dorsal branches of its digital nerves.

Other techniques described involve infiltrating the area 1-2 cm proximal to the digital-palmar crease similarly. I find they all work well for me.

What are others’ experiences?

Converts swear by this. Some even use this to anesthetise toes!

Bottom line

A single volar subcutaneous injection is efficacious and may be less painful for finger anesthesia.

Reference:
Cannon B, Chan L, Rowlinson JS, Baker M, Clancy M (2010). Digital anaesthesia: one injection or two? Emergency medicine journal: EMJ, 27 (7), 533-6 PMID: 20360491.

 

Author information

Stella Yiu, MD

Stella Yiu, MD

ALiEM Blog Contributor
Assistant Professor, University of Ottawa
Staff Physician, The Ottawa Hospital

The post Trick of the trade: Single digital block appeared first on ALiEM.

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