Evidence-Based Reviews

Interventional psychiatry (Part 1)

Current Psychiatry. 2023 May;22(5):24-35 | doi: 10.12788/cp.0356

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The facial feedback/emotional proprioception hypothesis has dominated thinking about the mood-improving effects of BT. The theory is that blocking muscular expression of sadness (especially in the face) interrupts the experience of sadness; therefore, depression subsides.^112,113 However, BT injections in the muscles involved in the smile and an expression of positive emotions (lateral part of the musculus orbicularis oculi) have been associated with increased MDD scores.¹¹⁴ Thus, the mechanism clearly involves more than the cosmetic effect, since facial muscle injections in rats also have antidepressant effects.¹¹⁵

The use of progressive muscle relaxation is well-established in psychiatric treatment. The investigated conditions of increased muscle tone, especially torticollis and blepharospasm, are associated with MDD, and it may be speculated that proprioceptive feedback from the affected muscles may be causally involved in this association.^116-118 Activity of the corrugator muscle has been positively associated with increased amygdala activity.¹¹⁹ This suggests a potential similar mechanism to that hypothesized for SGB.

Alternatively, BT is commonly used to treat chronic conditions that may contribute to depression; its success in relieving the underlying problem may indirectly relieve MDD. Thus, in a postmarketing safety evaluation of BT, MDD was demonstrated 40% to 88% less often by patients treated with BT for 6 of the 8 conditions and injection sites, such as in spasms and spasticity of arms and legs, torticollis and neck pain, and axilla and palm injections for hyperhidrosis. In a parotid and submandibular glands BT injection subcohort, no patients experienced depressive symptoms.¹²⁰

Medicinal BT is generally considered safe. The most common adverse effects are hypersensitivity, injection site reactions, and other adverse effects specific to the injection site.¹²¹ Additionally, the cosmetic effects are transient, given the nature of the medication.

Trigger point injections

TPIs in the neck and shoulders are frequently used to treat tension headaches and various referred pain locations in the face and arms. Tension and depression frequently overlap in clinical practice.¹²² Relieving muscle tension (with resulting trigger points) improves muscle function and mood.

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