Characterization of De Qi with Electroacupuncture at Acupoints with Different Properties

**Understanding the De Qi Sensation in Electroacupuncture: An Analysis of the Different Properties of Acupuncture Points**

The concept of "de qi" (得气), which can be translated as "arrival of qi" or "obtaining qi," is fundamental in traditional Chinese medicine and represents one of the most important aspects for successful acupuncture treatment. This special sensation, which patients experience during the procedure, is described in classical Chinese texts as essential for therapeutic efficacy. The ancient medical text Neijing states that "for acupuncture to be successful, the qi must arrive," while another classic mentions that "therapeutic effects come with the rapid arrival of qi." Despite the historical and clinical importance of this phenomenon, gaps remain in scientific knowledge about the specific characteristics of de qi, especially when using electroacupuncture, a technique that combines traditional needling with electrical stimulation and has become increasingly popular in modern clinical practice.

This Chinese scientific study aimed primarily to systematically investigate the characteristics of de qi sensations during electroacupuncture at different types of acupoints. To this end, the researchers recruited 21 young, healthy volunteers, aged 22 to 28 years, at a major traditional Chinese medicine hospital in Beijing. Five pairs of acupoints with distinct properties were selected: ST-36/GB-34, CV-4/CV-12, ST-36/ST-28, PC-6/PC-7, and ST-36/CV-4. Each pair was carefully chosen to represent different anatomical features, such as location on different meridians, tissue types (muscle, tendon, connective tissue), and distinct nerve innervation.

During the procedures, performed by experienced acupuncturists, participants received 15 Hz electrical stimulation after manual de qi was established. The researchers collected data on nine specific types of sensations: fullness, numbness, muscle soreness, tingling, heaviness, pressure, dull pain, warmth, and cold, in addition to recording the intensity, frequency, and propagation of these sensations.

The results revealed an interesting and consistent pattern in the sensations experienced by participants. The three most common and intense sensations were fullness, numbness, and muscle soreness, followed by tingling, heaviness, and pressure. The least frequent and least intense sensations included dull pain, warmth, and cold. In terms of frequency, fullness was the most prevalent sensation, occurring in the vast majority of procedures, while thermal sensations (warmth and cold) were the rarest.

A particularly notable finding was that different acupoints produced significantly different intensities of certain sensations, even when stimulated identically. For example, the comparison between ST-36 and ST-28 showed significant differences in the intensity of muscle soreness, fullness, and heaviness, while the comparison between ST-36 and CV-4 revealed differences in fullness and numbness. In addition, 77.8% of participants experienced sensation propagation beyond the needling site, generally extending across one joint but rarely beyond two joints.

These findings have important clinical implications for both patients and acupuncture practitioners. For patients, the study offers scientific validation of the sensations they may experience during electroacupuncture treatment, helping them understand that sensations such as fullness, numbness, and mild muscle soreness are not only normal but also indicative that the treatment is working appropriately. The rare occurrence of sharp pain (only 4.6% of cases) also provides reassurance about the safety of the procedure. For acupuncturists, the results suggest that different points may produce distinct qualities of de qi, possibly related to their different nerve innervations.

This may inform the selection of specific points based on the type of therapeutic sensation desired. The study also confirms that sensation propagation is a real and measurable phenomenon, occurring in more than three-quarters of treatments, which validates traditional descriptions of qi movement along the meridians.

It is important to recognize the limitations of this research for an appropriate interpretation of the results. The study was conducted exclusively with young, healthy volunteers, which means the results may not apply directly to patients with specific medical conditions, who represent the majority of people seeking acupuncture treatment. In addition, the sample was relatively small and culturally homogeneous, consisting mainly of Chinese participants familiar with traditional Chinese medicine concepts. Sensation assessment was based entirely on subjective participant reports, without corresponding objective measurements.

The study was also limited to only seven specific acupuncture points, representing a small fraction of the hundreds of points used in clinical practice. Future research would benefit from including more diverse patient populations, larger samples, and objective methods of measuring physiological responses to de qi, in addition to investigating a broader range of acupuncture points to confirm and expand these promising findings on the specific characteristics of this important therapeutic response.