蛙相对侧心室肌的心电向量综合情况研究

Study of electrocardial vectors synthesis of opposite sides ventricular muscle on frog

关键词:  心电图  常规导联  头胸导联  中心电端  心电向量

Key words:  electrocardiogram  routine lead  head chest lead  central terminal  electrocardial vector

摘要:

目的　探究牛蛙相对侧心室肌的心电向量是否形成综合。方法　记录30只牛蛙的常规导联心电图和头胸导联心电图。选择蛙剑突水平与前正中线、左腋中线、后正中线和右腋中线交点处V₁（HV₁）、V₂（HV₂）、V₃（HV₃）和V₄（HV₄）为心电图记录部位。结果　常规导联心电图可记录到r波或rs波，而头胸导联心电图在HV₁~HV₄记录到正向r波或rs波，未记录到负向波，头胸导联与常规导联对应部位及相对侧波形振幅代数和的比较差异均有统计学意义（P 均<0.001）。结论　头胸导联心电图在牛蛙心室肌前后侧和左右侧均可记录到正向r波或rs波，不支持相对侧心室肌心电向量形成综合，原因可能为Wilson中心电端参考电位略高于头胸导联的右前额参考电位，致使常规导联心前区记录到的电位偏低。

Abstract:

Objective 　To investigate whether the electrocardial vectors of the opposite ventricular muscle of bullfrog forms a synthesis. Methods 　The positions of V₁(HV₁), V₂(HV₂), V₃(HV₃) and V₄(HV₄) were selected at the intersection points of xiphoid process level with anterior midline, left axillary midline, posterior midline and right axillary midline respectively on the bullfrogs and both routine lead electrocardiogram (RLECG) and head chest lead electrocardiogram (HCECG) were recorded on 30 bullfrogs. Results 　The waves recorded by RLECG included r, rs and negative waves; however, only r or rs waves were recorded with HCECG from HV1 to HV4, and no negative waves were recorded. The comparison of the algebraic sum of ECG waves amplitudes at the corresponding parts and opposite sides of ventricular wall between HCECG and RLECG were all statistically significant (P <0.001). Conclusions 　R or rs waves recorded by HCECG from HV₁ to HV₄ do not support the formation synthesis of the electrocardial vectors of opposite ventricular muscle in bullfrog. Synthesis of electrocardial vectors of bullfrog's opposite ventricle in RLECG may be due to its slightly higher reference potential at Central Terminal than that at the right forehead in head chest lead.