The "Carol Davila" University of Medicine and Pharmacy, Bucharest, Romania.
The "Bucur" Maternity, "Saint John" Hospital, Bucharest, Romania.
J Perinat Med. 2021 Feb 11;49(5):566-571. doi: 10.1515/jpm-2020-0169. Print 2021 Jun 25.
The impedance cardiography (ICG) technique measures the variation of impedance in the thorax due to the physical contractile activity of the heart. Twin pregnancy is characterized by greater maternal hemodynamic changes than a singleton pregnancy.
In a study on 121 pregnant women in the last trimester we performed ICG, evaluating the following hemodynamic parameters: stroke volume, heart rate, cardiac output, ventricular ejection time, left ventricular ejection time, thoracic impedance, and systemic vascular resistance.
The study included singleton and twin pregnancies. Heart rate values in women with single fetus was lower than in those carrying twins (85 vs. 100 beats/min, p=0.021) as were the stroke volume values (64 vs. 83 mL, p=0.010) and the cardiac output (p<0.0001). Systemic vascular resistance decreased in twin pregnancies compared to singleton pregnancy (p=0.023).
ICG studies are rare, and the validation of their results is an ongoing process. However, the ICG technique is applicable in the third trimester of pregnancy and can yield important information regarding the hemodynamic profile of singleton and twin pregnancies, revealing maternal heart changes specific to twin pregnancies.
阻抗心动描记术（ICG）技术测量由于心脏的物理收缩活动引起的胸部阻抗的变化。双胎妊娠的母体血液动力学变化比单胎妊娠更大。
在一项对 121 名孕晚期妇女的研究中，我们进行了 ICG，评估了以下血液动力学参数：每搏量、心率、心输出量、心室射血时间、左心室射血时间、胸阻抗和全身血管阻力。
该研究包括单胎和双胎妊娠。单胎妊娠妇女的心率值低于双胎妊娠妇女（85 次/分与 100 次/分，p=0.021），每搏量值（64 毫升与 83 毫升，p=0.010）和心输出量（p<0.0001）也较低。与单胎妊娠相比，双胎妊娠全身血管阻力降低（p=0.023）。
ICG 研究很少，其结果的验证仍在进行中。然而，ICG 技术适用于妊娠晚期，可以提供关于单胎和双胎妊娠血液动力学特征的重要信息，揭示双胎妊娠特有的母体心脏变化。
