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Recording of maternal uterine pressure (UP) and fetal heart rate (FHR) during labor and delivery is a procedure referred to as cardiotocography. We modeled this signal pair as an input-output system using a system identification approach to estimate their dynamic relation in terms of an impulse response function. We also modeled FHR baseline with a linear(More)
OBJECTIVE To determine the ability of variable decelerations and 8 subtypes, defined by size and shape, to discriminate tracings between babies with normal umbilical artery gases (N) and those with metabolic acidemia (MA). METHODS Tracings from the last 4 hours from N-3320 babies with base deficit levels under 8 mmol/L, and from MA-316 babies with base(More)
We construct input-output models by linear system-identification methods for uterine pressure - fetal heart rate data collected during labour and delivery. Using standard hypothesis tests, the impulse response model coefficients show statistically significant differences between normal and pathological cases.
OBJECTIVE Statistical methods that measure the independent contribution of individual factors for third-/fourth-degree perineal laceration (TFPL) fall short when the clinician is faced with a combination of factors. Our objective was to demonstrate how a statistical technique, classification and regression trees (CART), can identify high-risk clinical(More)
Despite its recognized limitations, fetal heart rate monitoring is a mainstay of intrapartum care. Although the basic technology in standard electronic fetal monitors has changed little in recent decades, clinical behavior in response to heart rate monitoring has changed considerably. In addition to clearly defined nomenclature and clinical guidelines,(More)
The advent of the Virtual Reality Modeling Language (VRML) as a portable file format for describing three-dimensional (3-D) scenes has enabled researchers, educators, and students to share anatomical models on the World Wide Web (WWW). The implication for medical teaching is that students can interactively examine anatomical structures and their 3-D spatial(More)
OBJECTIVE The objective of the study was to measure the performance of a 5-tier, color-coded graded classification of electronic fetal monitoring (EFM). STUDY DESIGN We used specialized software to analyze and categorize 7416 hours of EFM from term pregnancies. We measured how often and for how long each of the color-coded levels appeared in 3 groups of(More)
Labor monitoring is crucial in modern health care, as it can be used to detect (and help avoid) significant problems with the fetus. In this paper we focus on hypoxia (or oxygen deprivation), a very serious condition that can arise from different pathologies and can lead to lifelong disability and death. We present a novel approach to hypoxia detection(More)
Labor and delivery are routinely monitored electronically with sensors that measure and record maternal uterine pressure (UP) and fetal heart rate (FHR), a procedure referred to as cardiotocography (CTG). Delay or failure to recognize abnormal patterns in these recordings can result in a failure to prevent fetal injury. We address the challenging problem of(More)
Using cardiotocography data from labour and delivery, the objective of this study was to decompose fetal-heart rate variability (fHRV) based on auto-regressive power spectral density analysis into a quiescent component unrelated to contraction and a peak component response to contraction. During the last 3 hours of labour and delivery, this approach(More)