Abstract
Pregnant women show characteristic hemodynamics, and their heart rates ordinarily increase with uterine contractions during labor. Conversely, uterine contraction-associated decelerations of maternal heart rate (MHR) are rare. We present a pregnant woman with paroxysmal supraventricular tachycardia (PSVT) who exhibited intrapartum MHR deceleration pattern. We performed simultaneous fetal heart rate monitoring with an external ultrasound transducer and MHR monitoring with a tocogram during her parturition. She developed a PSVT exacerbation in the second stage of parturition. As revealed by cardiotocography, the MHR baseline abruptly declined at onset of uterine contractions during the active phase of labor. Recovery followed, and the contraction resolved. The tachycardia got prolonged as the labor advanced. Our patient exhibited the unusual, up-and-down changes of the MHR pattern associated with labor contractions. The etiology of the occurrence of uterine contraction-associated MHR decelerations was unclear in the present case. Continuous tracing to visually inspect MHR patterns during parturition is a simple method for examining real-time MHR status of patients treated within obstetric practice settings.
Highlights
Maternal heart rate (MHR) monitoring during labor has some benefits
We present a pregnant woman with paroxysmal supraventricular tachycardia (PSVT) who exhibited intrapartum maternal heart rate (MHR) deceleration pattern
Continuous tracing to visually inspect MHR patterns during parturition is a simple method for examining real-time MHR status of patients treated within obstetric practice settings
Summary
Intrapartum MHR pattern can be a pragmatic marker of intrapartum volume status and can provide information about intrapartum fluid management [2]. MHR monitoring helps avoid misinterpretation of MHR as a fetal heart rate (FHR) during labor, as we previously reported [3]. Maternal hemodynamics change considerably before and after uterine contractions by compensatory mechanisms. The association of MHR change with labor in pregnant women with paroxysmal supraventricular tachycardia (PSVT) is poorly understood. This report examined how the MHR pattern of a pregnant woman with PSVT changed in response to labor using continuous heart rate tracing during parturition. The patient provided written informed consent for this report
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