{'fraction_non_alphanumeric': 0.043006263048016705, 'fraction_numerical': 0.0162839248434238, 'mean_word_length': 4.99, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Research on the Connection Pathway between "Tianquan" (PC 2) of the "Pericardium Meridian" and the Heart in the Cat

Objective: To explore the connection pathway between "Tianquan" (PC 2) of the Pericardium Meridian and the heart with the combined electrophysiological and morphological techniques. Methods: 34 cats anesthetized with urethane (500 mg/kg) and chloralose (50 mg/kg) were used in the first part of the present study. ① After isolating the left inferior cardiac nerve (LICN) and the left lateral cutaneous nerve (LLCN) and performing a skin flap bath of paraffin-oil, discharges of LCN were fed to VC-10 oscilloscope and histogramer via a bipolar platinum electrode (reference electrode placed beneath the subcutaneous tissues), and recorded by using a X-Y recorder. LICN was stimulated with an electric stimulator. The myoelectrical activities of "Tianquan" (PC 2) and "Tianfu" (LU 3) areas were recorded respectively through two pairs of acupuncture needle electrodes. The reaction threshold was set to that the electric stimulation just could evoke myoelectric signal changes. ② In the second part of this study, ten cats anesthetized with 1% pentobarbital (40 mg/kg) were used. Propidium Iodide (PI, 10 μL) was carefully injected into the sheath of LLCN and the muscles around "Tianquan" (PC 2) and bis Benzimide (bB, 5 μL) injected respectively into and the LICN and the stellate ganglion. Results: Following electric stimulation of LICN, the firing rates of LLCN and myoelectrical activity of"Tianquan" (PC 2) increased pronouncedly in comparison with pre-stimulation(P0.01); while no significant changes of myoelectric signals of "Tianfu" (LU 3) were found. After cutting off the dorsal and ventral roots of C 7～T 2 separately, the thresholds of the discharges of the LLCN and "Tianquan" (PC 2) area responding to stimulation of the LICN increased gradually, being significant in T 1, C 8 and C 7 in comparison with pre-section of nerves. After microinjection of PI and bB, light microscopic examination showed that the single and the double labeled neurons were mainly located in C 7, C 8 and T 1 dorsal root ganglions with C 8 being the utmost. Conclusion: a) There exists a relatively specific connection between "Tianquan" (PC 2) and the heart; b) C 7～T 1 segments may be responsible for the connection between "Tianquan" (PC 2) of the Pericardium Meridian and the heart.