[Correlation between referred pain distribution and acupoint sensitization in patients with intestinal diseases].

OBJECTIVE: To observe the correlation between referred pain distribution and acupoint sensitization in patients with intestinal diseases. METHODS: In clinical research, 443 patients from 8 hospitals were recruited, including the outpatients and inpatients of Crohn's disease (n=143), ulcerative colitis (n=108), chronic appendicitis (n=87) and other intestinal diseases (n=105). The site with tenderness on the body surface and the morphological changes of local skin were observed and recorded in the patients. Using a sensory tenderness instrument, the pain threshold at the sensitization point was measured in 60 patients with ulcerative colitis. In animal experiment, SD rats were used and divided into a enteritis group (n=8), in which the enteritis model were established, and a control group (n=3), in which no any intervention was given. After the injection of Evans blue (EB) at caudal vein, the blue exudation points on the body surface were observed and the distribution rule was analyzed statistically. RESULTS: The referred pain on the body surface in the patients with intestinal diseases was mainly located in the lower abdomen (93.9%, 416/443), the lumbar region (70.9%, 314/443) and the lower legs (33.0%, 146/443). The diameter of tenderness region was 1.5 to 2.5 cm. Compared with the region without sensitization, the pain threshold of the sensitization point in the patients with ulcerative colitis was reduced significantly (P<0.001). The referred pain on the body surface in the patients with appendicitis was located in the right lower abdomen (97.7%, 85/87), the waist and back (54.0%, 47/87) and the right lower limbs on the medial side (71.3%, 62/87). The tenderness region was 1 to 2 cm in diameter and was irregular in form. After modeling of enteritis in the rats, the EB exudation points were visible from T12 to L2. CONCLUSION: Intestinal diseases induce referred pain on the body surface where is the same as or adjacent to the location of the spinal segment corresponding to the affected intestinal section. These sensitization regions are related to the locations of acupoints.

[Correlation Between Referred Pain Region and Sensitized Acupoints in Patients with Stable Angina Pectoris and Distribution of Sensitized Spots in Rats with Myocardial Ischemia].

OBJECTIVE: To observe the correlation between the referred pain regions of stable angina pectoris (SAP) and the acupoints in coronary heart disease (CHD) patients and to investigate the rule of regional sensitized point distribution in rats. METHODS: A total of 1 046 CHD patients with SAP from 8 hospitals in China were recruited in the present study. The tenderness was palpated along the left and right chest, back, shoulder, upper limb, etc. by a specially-assigned researcher in each hospital. Among them, 77 patients accepted pain threshold (PT) measurement by using a hand-held esthesiometer. In animal experiments, 14 SD rats were subjected to occlusion of the left anterior descending branch of the left coronary artery for 4 h for establishing myocardial ischemia (MI) model, and other 4 normal rats were used as the sham-operation control group. Four hours after MI, all the rats accepted tail venous injection of 5% Evans blue (50 mg/kg) for examining the distribution of the blue dye exudation spots at the body surface where the mechanical PT was also detected by a von Frey. RESULTS: In 1 046 CHD patients, 987 (94.36%) were found to have at least one tenderness spot. The tenderness spots were found at the left chest (87.47%), right chest (13.67%), left arm (ulnar side, 41.30%), right upper limb (4.68%), left shoulder back (30.21%), right shoulder back (7.07%), etc., accompanied with rash or pigmentation, subcutaneous induration, cord-like tissue contracture, skin sag, etc. The mechanical PT level was significantly lower at the tenderness spots of the left upper limb than at non-tender points of the right upper limb in CHD patients (P<0.001). Tenderness and cutaneous abnormal changes in angor pectoris patients distributed mostly on the left chest, back, shoulder and upper limb, and some also on the right. Tender points scattered on, near or outside acupoints. A similar distribution of the blue exudation spots and lower mechanical PT spots were found in MI rats, but not in sham-MI rats. CONCLUSION: In the case of MI, a regular "referred sensitization" response frequently occurs in the dermatomere area innervated by the corresponding segments (T 1－T 5) in both CHD patients and MI rats, which may be closely associated with the formation of acupoints in ancient China.

[Acupuncture Treatment of Primary Dysmenorrhea by Needling Acupoints of the Spleen Meridian with Positive Reactions：A Randomized Controlled Clinical Trial].

OBJECTIVE: To observe whether acupuncture of the tender-points of the Spleen Meridian can achieve a better therapeutic effect for primary dysmenorrhea (PD) patients, so as to verify the importance of examining meridian-acupoint reactions in clinical practice. METHODS: A total of 72 PD patients were randomly assigned to tender-point group (observation group) and regular acupoint group (control group, n＝36 in each). For patients of the observation group, the tender-points around San-yinjiao (SP 6), Diji (SP 8) and Yinlingquan (SP 9) were needled, and for those of the control group, the regular SP 6, SP 8 and SP 9 were needled. After "Deqi", the filiform needles were manipulated with lifting-thrusting reducing technique for about 30 s, repeated once again every 10 min during 30 min's needle retention, and the treatment was conducted once daily for 3 days during every menstrual cycle, continuously for 3 months. The visual analogue scale (VAS) was rated for assessing the pain severity, and the COX menstrual symptom scale (CMSS) consists of 17 items and 5 grades/item (0－4 points) according to the severity of discomfort was rated before and after the treatment. RESULTS: After the treatment, the VAS and CMSS scores on the 1st days of the 1st, 2nd and 3rd menstrual cycles were significantly decreased in both control and observation groups in comparison with their own individual pre-acupuncture (P<0.05), suggesting a marked relief of both pain and discomforts after the treatment, and the therapeutic effect of the tender-point needling was significantly superior to that of the regular acupoint needling in relieving pain in the 2nd and 3rd menstrual cycles. No significant difference was found between the two groups in the discomfort severity (P>0.05). CONCLUSION: Acupuncture stimulation of the tender points around the SP 6, SP 8 and SP 9 has a stronger analgesic effect relevant to needling the regular acupoints in PD patients.