Auricular Acupuncture at the ''Shenmen'' and ''Point Zero'' Points Induced Parasympathetic Activation

Auricular acupuncture, a technique that uses specific points on the ear to treat various conditions, has been widely studied for its ability to promote pain relief, relaxation, and improvements in overall well-being. This form of acupuncture is based on the principle of normalizing bodily dysfunctions through stimulation of specific points on the ear, which connect with different organs and body systems. Researchers believe that these therapeutic effects occur through modulation of the autonomic nervous system, which is responsible for controlling involuntary body functions such as heartbeat, respiration, and digestion. Previous studies have already demonstrated benefits of auricular acupuncture in relieving postoperative pain, improving neurological rehabilitation, and treating insomnia, suggesting its potential to positively influence the nervous system.

This study aimed specifically to investigate how auricular acupuncture at the "Shenmen" and "Point Zero" points affects autonomic nervous system activity in patients after surgery. To this end, the researchers conducted a randomized controlled trial with 26 patients who underwent hemicolectomy, a surgical procedure for removal of part of the large intestine, under general anesthesia. The patients were randomly divided into two groups: a control group that received no additional treatment, and an acupuncture group that received small adhesive needles at specific auricular points after surgery. To assess autonomic nervous system activity, the researchers used a sophisticated technique called heart rate variability analysis, which measures the small variations in intervals between heartbeats.

This analysis can identify when the sympathetic nervous system (responsible for the "fight-or-flight" response) or the parasympathetic nervous system (responsible for relaxation and recovery) is more active.

The study results revealed significant differences between the two groups during the postoperative period. In the control group, there was a progressive increase in the ratio between low-frequency and high-frequency components of heart rate variability, indicating greater activation of the sympathetic nervous system and lower activation of the parasympathetic. By contrast, the group that received auricular acupuncture maintained this ratio stable at lower levels, suggesting better autonomic nervous system balance. More specifically, patients in the acupuncture group showed significantly higher high-frequency values, a marker of parasympathetic activity, at 3, 4, and 5 hours after surgery.

These findings indicate that auricular acupuncture at the "Shenmen" and "Point Zero" points promoted sustained parasympathetic activation during the postoperative recovery period.

For patients and health professionals, these results have important clinical implications. Parasympathetic activation is associated with states of relaxation, better recovery, and stress reduction, which can be particularly beneficial in the postoperative period when the body needs to recover from surgical trauma. The study suggests that auricular acupuncture can be a simple, non-invasive intervention to promote a state more favorable to recovery after surgery. The points used in the study, "Shenmen" and "Point Zero," are known in auricular acupuncture for their tranquilizing effects and their effects on overall body balance.

For health professionals, this represents a complementary tool that can be easily integrated into standard postoperative care, potentially contributing to better patient comfort and more efficient recovery.

It is important to recognize the limitations of this study when interpreting its results. The relatively small number of participants (26 patients) requires that the findings be confirmed in larger studies before they can be broadly generalized. In addition, the study focused specifically on patients undergoing a particular type of intestinal surgery, so the results may not apply to other types of surgical procedures. The researchers also used a specific form of auricular acupuncture with adhesive needles, and it is unclear whether other methods of auricular stimulation would produce similar effects.

Despite these limitations, the study provides objective scientific evidence that auricular acupuncture can positively influence the autonomic nervous system in the postoperative period. This research contributes to the growing body of evidence on the mechanisms by which acupuncture exerts its therapeutic effects, offering a sound scientific basis for its clinical application as a complementary therapy in postoperative care.