Corometrics 145 - Page 6

SECTION 1
INTRODUCTION
The Corometrics Model 145 Fetal Monitor is designed for fetal heart rate and maternal uterine contraction monitoring using
external methods. Simultaneous trends of fetal heart rate (FHR) and uterine activity (UA) are plotted continuously on the
built-in dual channel strip chart recorder. FHR is displayed continuously on the front-panel numeric display.
EXTERNAL MONITORING MODES
1. Continuous-Wave Doppler Ultrasound: A transducer placed on the abdomen is used to direct an ultrasonic beam
toward the fetal heart and to sense Doppler-shifted echoes created by moving cardiac structures. A patented
autocorrelation process is used to determine the timing of successive cardiac cycles.
2. Tocodynamometer: A tocotransducer placed on the maternal abdomen will record changes in abdominal tension. The
resulting tracings will reflect uterine contractions or fetal movement. The readings are recorded on the strip-chart paper in
a relative scale from 0 to 100.
Introduction * 1