Thacker SB, Stroup DF, Peterson HB.
Efficacy and safety of intrapartum electronic fetal monitoring: an update.
Obstet Gynecol 1995 Oct;86(4 Pt 1):613-620.
OBJECTIVE: To compare the efficacy and safety of routine electronic fetal
monitoring (EFM) of labor with intermittent auscultation, using the results of
published randomized controlled trials (RCTs). DATA SOURCES: We identified RCTs
by searching the MED-LINE data base for the period 1966-1994, contacting
experts, and reviewing published references. METHODS OF STUDY SELECTION: Our
search identified 12 published RCTs addressing the efficacy and safety of EFM;
no unpublished studies were found. The studies included 58,855 pregnant women
and their 59,324 infants in both high- and low-risk pregnancies from ten
clinical centers in the United States, Europe, Australia, and Africa. DATA
EXTRACTION AND SYNTHESIS: Data were abstracted, and their accuracy was confirmed
independently. A single reviewer assessed study quality based on criteria
developed by others for RCTs. Data reported from similar studies were used to
calculate a combined risk estimate for each of nine outcomes. Overall, a
statistically significant decrease was associated with routine EFM for a
1-minute Apgar score less than 4 (relative risk [RR] 0.82, 95% confidence
interval [CI] 0.65-0.98) and neonatal seizures (RR 0.5, 95% CI 0.30-0.82). The
protective effect of EFM for a 1-minute Apgar score less than 4 was apparent
only in the non-United States studies, and the protective effect for neonatal
seizures was evident only in studies with high-quality scores. No significant
differences were observed in 1-minute Apgar scores less than 7, rate of
admissions to neonatal intensive care units, and perinatal death. An increase
associated with the use of EFM was observed in the rate of cesarean delivery (RR
1.33, 95% CI 1.08-1.59) and total operative delivery (RR 1.23, 95% CI
1.15-1.31). Risk of cesarean delivery was greatest in low-risk pregnancies. CONCLUSION:
The only clinically significant benefit from the use of routine EFM was in the
reduction of neonatal seizures. Because of the increase in cesarean and
operative vaginal deliveries, the long-term benefit of this reduction must be
evaluated in the decision reached jointly by the pregnant woman and her
clinician to use EFM or intermittent auscultation during labor.
Thacker SB, Stroup D, Chang M.
Continuous electronic heart rate monitoring for fetal assessment during labor
Cochrane Database Syst Rev 2001;2:CD000063
BACKGROUND: Electronic fetal monitoring (EFM) is used in the management of
labor and delivery in nearly three of four pregnancies in the United States. The
apparent contradiction between the widespread use of EFM and expert
recommendations to limit routine use indicates that a reassessment of this
practice is warranted. OBJECTIVES: To compare the efficacy and safety of routine
continuous EFM during labor with intermittent auscultation, using the results of
published randomized controlled trials (RCTs). SEARCH STRATEGY: We identified
RCTs by searching MEDLINE and the register maintained by the Cochrane Pregnancy
and Childbirth Group, and by contacting experts, and reviewing published
references. Date of last search: January 2001. SELECTION CRITERIA: Randomized
controlled trials. DATA COLLECTION AND ANALYSIS: Data were abstracted by one of
us, and their accuracy was confirmed independently by a second person. A single
reviewer assessed study quality based on criteria developed by others for RCTs.
Data reported from similar studies were used to calculate a combined risk
estimate for each of eight outcomes. MAIN RESULTS: Our search identified 13
published RCTs addressing the efficacy and safety of EFM; no unpublished studies
were found. Four trials that did not fulfil our selection criteria were
excluded. The remaining nine trials included 18,561 pregnant women and their
18,695 infants in both high- and low-risk pregnancies from seven clinical
centers in the United States, Europe, and Australia. Overall, a statistically
significant decrease was associated with routine EFM for neonatal seizures
(relative risk (RR) 0.51, 95% confidence interval (CI) 0.32-0.82). The
protective effect for neonatal seizures was only evident in studies with
high-quality scores. No significant differences were observed in 1-minute Apgar
scores below four or seven, rate of admissions to neonatal intensive care units,
perinatal deaths or cerebral palsy. An increase associated with the use of EFM
was observed in the rate of cesarean delivery (RR 1.41, 95% CI 1.23-1.61) and
operative vaginal delivery (RR 1.20, 95% CI 1.11-1.30). REVIEWER'S CONCLUSIONS:
The only clinically significant benefit from the use of routine continuous EFM
was in the reduction of neonatal seizures. In view of the increase in cesarean
and operative vaginal delivery, the long-term benefit of this reduction must be
evaluated in the decision reached jointly by the pregnant woman and her
clinician to use continuous EFM or intermittent auscultation during labor.
"Routine Electronic Monitoring Of Fetuses Is Challenged in
Study," Warren E. Leary, New York Times, A11, Oct. 25, 2000.
Electronic fetal monitoring during labor and delivery, used with a majority of births in
this country, offers little significant benefit to justify its routine use, according to
researchers reviewing the practice.
Researchers at the Federal Centers for Disease Control and Prevention in Atlanta said a
review of the most significant controlled studies of the effectiveness and safety of
electronic fetal monitoring indicated that routine use of the procedure had no measurable
effect on death or illness of infants or mothers.
But they said electronic monitoring was associated with a higher rate of Cesarean
deliveries, which increases surgical risks to mothers.
Continuous electronic fetal monitoring: contradictions between practice and
J Obstet Gynecol Neonatal Nurs 1999 Jul;28(4):409-416.
The reliability, validity, and efficacy of electronic fetal monitoring (EFM)
remain matters of controversy. In fact, several professional organizations,
including the American College of Obstetricians and Gynecologists, have endorsed
the use of intermittent auscultation for low-risk pregnant women. Nevertheless,
in 1996, 83% of laboring women in the United States are monitored
electronically. Nurses should encourage healthy, low-risk pregnant women to
weigh carefully decisions about the use of EFM.
Kaczorowski J, Levitt C, Hanvey L, Avard D, Chance G.
"A national survey of use of obstetric procedures and technologies in
Canadian hospitals: routine or based on existing evidence?"
Birth 1998 Mar;25(1):11-18.
BACKGROUND: The objective of this national survey was to describe the routine
use of procedures and technologies in Canadian hospitals providing maternity
care, and to determine the extent to which current use was consistent with the
existing evidence and recommended guidelines for maternal and newborn care.
METHODS: Representatives of 572 hospitals providing maternity care across Canada
were sent questionnaires in the spring and summer of 1993; 523 (91.4%)
responded. The primary outcome measures consisted of the self-reported use of
obstetric procedures and technologies (perineal shaves, enemas/suppositories,
intravenous infusions, initial and continuous electronic fetal heart monitoring,
episiotomy rates). Hospitals were grouped according to location, size (number of
live births per year), and university affiliation status. RESULTS: The hospitals
in the Prairie provinces, in Quebec, and in the Atlantic provinces were
significantly less likely than those in Ontario to restrict their use of
perineal shaves and enemas to women on admission in labor. Small hospitals were
significantly more likely than large hospitals (> 1000 live births) to
restrict their use of intravenous infusions, and initial and continuous
electronic fetal monitoring. The university-affiliated and nonteaching hospitals
were significantly less likely than the university teaching hospitals to have
episiotomy rates of less than 40 percent for primiparous women. Small hospitals
were more likely than large hospitals to report episiotomy rates of less than 20
percent for multiparous women. CONCLUSIONS: Considerable variations occur in the
routine use of obstetric procedures and technologies in Canadian hospitals
providing maternity care, according to hospital location, size, and university
affiliation status. Despite the existing evidence suggesting that the routine
use of these practices and procedures is both unnecessary and potentially
harmful, a significant number of Canadian hospitals continued to use them
routinely in 1993.
Albers, Leah and C. J. Krulewitch. 1993. "Electronic fetal monitoring in the
United States in the 1980s." Obstetrics & Gynecology 82:8-10.
OBJECTIVE: To measure the frequency with which electronic fetal monitoring was used for
childbirth in United States hospitals in the 1980s and to examine variation in use
according to risk factors at labor onset. METHODS: Two data sets from the National Center
for Health Statistics (the 1980 National Natality Survey and the 1988 National Maternal
and Infant Health Survey) were used to generate proportional frequencies for electronic
fetal monitoring use. These data files are based on representative samples of live births
(9941 and 9953, respectively) drawn by probability methods from the entire country during
a calendar year. Consistency in the sampling methods and questionnaire procedures, and use
of sampling weights, permitted national estimates to be generated. RESULTS: Use of
electronic fetal monitoring increased from 44.6% of live births in 1980 to 62.2% in 1988.
In both time periods, low-risk women received monitoring more frequently than did women
with risk indicators. Use grew by 64% in low-risk women (from 46.5% in 1980 to 76.3% in
1988) but only by 32% in women with risk conditions at labor onset (from 42.6% in 1980 to
56.2% in 1988). CONCLUSIONS: Use of electronic fetal monitoring increased during the
1980s, disproportionately so for low-risk women. This trend raises questions about the
efficacy of monitoring for improving pregnancy outcomes.
Albers, Leah L. and D. A. Savitz. 1991. "Hospital setting for birth and use of
medical procedures in low-risk women." Journal of Nurse-Midwifery 36:327-33.
This study examined the use of selected medical procedures in low-risk women during
childbirth. Data from the 1980 National Natality Survey merged with an American Hospital
Association annual survey for the same year were used to assess the frequency with which
low-risk women in the United States received certain childbirth procedures and to
determine whether their use varied by the hospital setting for birth. Stratified analysis
was used to assess the relation of hospital level for delivery with the use of electronic
fetal monitoring, labor induction, and primary cesarean delivery in low-risk women, with
control for potential confounding factors. As the level of available perinatal technology
increased, the use of these procedures increased. Results of the study suggest that
low-risk women may have received excess interventions and confirm the need for further
examination of care procedures for this group.
Daniels, S. M. and N. Boehm. 1991. "Auscultated fetal heart rate accelerations. An
alternative to the nonstress test." Journal of Nurse Midwifery 36:88-94.
This nonexperimental, descriptive correlational study was conducted o determine whether a
significant difference exists between the results of an electronically monitored nonstress
test (NST) and those of auscultation for single fetal heart rate acceleration, the
auscultated acceleration test (AAT). Of 130 NSTs, both the NST and he AAT were reactive in
105 cases and both were nonreactive in seven cases. Eighteen nonreactive AATs went on to
have reactive NSTs (72.00% false-positive rate). There were no reactive AATs that went on
to have nonreactive NSTs (0% false-negative rate). Various recommendations are made for
future research in an attempt to decrease the false-positive rate. The McNemar's test for
data analysis used in previous research indicated that there was a significant difference
between the two tests. However, the sensitivity (100%) and specificity (85.37%) of the AAT
indicate that he test is valid in predicting the results of the NST and thus appears to be
a valid screening tool for fetal well-being and may be a reliable alternative to the NST.
Davies BL. Niday PA. Nimrod CA. Drake ER. Sprague AE. Trepanier MJ. 1993.
"Electronic fetal monitoring: a Canadian survey." Canadian Medical Association
OBJECTIVES: To determine the current status of electronic fetal monitoring (EFM) in
Canadian teaching and nonteaching hospitals, to review the medical and nursing standards
of practice for EFM and to determine the availability of EFM educational programs. DESIGN:
National survey in 1989. PARTICIPANTS: The directors of nursing at the 737 hospitals
providing obstetric care were sent a questionnaire and asked to have it completed by the
most appropriate staff member. The response rate was 80.5% (593/737); 44 hospitals did not
have deliveries in 1988 and were excluded. The remaining hospitals varied in size from 8
to 1800 (mean 162.1) beds and had 1 to 7500 (mean 617.1) births in 1988; 18.8% were
teaching hospitals. RESULTS: Of the 549 hospitals 419 (76.3%) reported having at least 1
monitor (range 1 to 30; mean 2.6); the mean number of monitors per hospital was higher in
the teaching hospitals than in the nonteaching hospitals (6.2 v. 1.7). Manitoba had the
lowest mean number of monitors per hospital (1.1) and Ontario the highest (3.7). In 71.8%
of the hospitals with monitors almost all of the obstetric patients were monitored at some
point during labour. However, 21.6% of the hospitals with monitors had no policy on EFM
practice. The availability of EFM educational programs for physicians and nurses varied
according to hospital size, type and region. CONCLUSIONS: Most Canadian hospitals
providing obstetric services have electronic fetal monitors and use them frequently.
Although substantial research has questioned the benefits of EFM, further definitive
research is required. In the meantime, a national committee should be established to
develop multidisciplinary guidelines for intrapartum fetal assessment.
Donker DK. van Geijn HP. Hasman A. 1993. "Interobserver variation in the
assessment of fetal heart rate recordings." European Journal of Obstetrics,
Gynecology, & Reproductive Biology 52:21-8.
Electronic fetal heart rate monitoring (EFM) has not fulfilled its expectations. To
improve its validity various attempts were made to standardize terminology and assessment
of fetal heart rate (FHR) recordings. In a multinational study, 21 experienced
obstetricians were asked to segment and classify FHR patterns, recorded in 13 obstetric
cases. In addition, the referees were asked to give their interpretation of the FHR
pattern, to assess the fetal condition and to propose obstetric management. The kappa
statistic showed fair agreement among the obstetricians for the classification of
accelerations, baseline segments and decelerations. Poor agreement was found when the
referees had to classify baseline variability or the type of deceleration. Also, the
clinical assessment of fetal condition and proposals for obstetric management showed poor
agreement among the referees. We conclude there is still a lack of unequivocal terminology
and definitions in the assessment of FHR recordings.
Ellison, P. H. et al. 1991. "Electronic fetal heart monitoring, auscultation, and
neonatal outcome." American Journal of Obst Gyn 164:1281-9.
In a large randomized, controlled study of fetal heart rate monitoring with either
continuous electronic fetal heart monitoring or auscultation at specified intervals, only
one pattern of deviation in the fetal heart rate correlated significantly with neonatal
neurologic examinations at 0 to 48 hours and 72 hours to 1 week: late decelerations in
stage 1 and in stage 2. Other variables from labor and delivery, specifically, duration of
labor after hospital admission, failure of labor to progress, number of fetal scalp pH
values, and presence of meconium were important predictors of neonatal outcome in the
regression analyses. The fetal heart rate deviations did contribute significantly to the
percent variance accounted for in the regression analyses with neonatal outcomes of Apgar
scores at 1 and 5 minutes and serial neonatal neurologic examinations. Author-abstract.
Kaiser, G. 1991. "Do electronic fetal heart rate monitors improve delivery
outcomes?" Journal of Fla Med Assoc 78:303-7.
Since the development of electronic fetal heart rate monitors, there has been considerable
debate over observable benefits of their use. Early uncontrolled observational studies and
retrospective case studies suggested that fetal distress detected by monitoring could help
lower both intrapartum and neonatal death rates, serving a utility among high risk
deliveries. However, these studies were conducted at a time when neonatal intensive care
units and advancing echnologies were also beginning to markedly influence perinatal
mortality. Randomized clinical trials of the past 10 years have compared electronic
monitoring to routine periodic auscultation and have consistently failed to demonstrate a
statistically significant difference in either the perinatal mortality rate or the outcome
of high risk pregnancies. A few of these studies, however, did report a lower incidence of
neurological complications within the monitored deliveries. The latest research, though,
has failed to substantiate any long-term neurological benefits from electronic monitoring.
Killien, M. G. and K. Shy. 1916. "A randomized trial of electronic fetal
monitoring in preterm labor: mothers' views." Birth 1:7-12.
To determine if perceptions of preterm labor and birth differed between women who were
monitored by electronic fetal monitoring (EFM) or by periodic auscultation, 135 subjects
were randomly assigned to one of two treatment groups on admission to a tertiary perinatal
care setting. The first group received external monitoring by continuous Doppler and
tocodynamometer when membranes were intact, and with an internal fetal scalp electrode and
pressure catheter once membranes were ruptured. The second group received periodic
monitoring with a DeLee fetoscope or amplified Doppler. All women were cared for on a
one-to-one basis by expert study nurses. Subjects completed a questionnaire about their
labor experience during their postpartum hospital stay. There was no statistically
significant difference between the two groups on the study measures [T2(7,81) = 13.65; F =
1.82; P greater than 0.05]. Forty-four percent of the variance in women's global
evaluation of labor was explained by their perceptions of nursing support. These findings
suggest that mothers' perceptions of their preterm labor are less influenced by the
technologic interventions used than by the supportive care received from nurses.
Larson, E. B. et al. 1989. "Fetal monitoring and predictions by clinicians:
observations during a randomized clinical trial in very low birth weight infants."
Obst Gyn 74:584-9.
Predictions about perinatal outcome in very low birth weight infants were studied in a
randomized clinical trial of electronic fetal monitoring and periodic auscultation to
assess the effect of diagnostic monitoring information on clinicians' ability to predict
perinatal outcomes. The only predictions consistently correct before monitoring
information was available were those regarding infant survival (88% correct, kappa [kappa]
= 0.40, P less than .001 for the electronic fetal monitoring group; 80% correct, kappa =
0.35, P less han .01 for the periodic auscultation group). After monitoring, predictions
of 5-minute Apgar scores and arterial cord pH were significantly more accurate, and
clinicians' confidence in their predictions increased significantly in both the electronic
fetal monitoring and the auscultation groups. Predictions of 5-minute Apgar scores were
significantly more accurate in the electronic fetal monitoring group (92% correct, kappa =
0.80) than in the periodic auscultation group (61% correct, kappa = 0.28) (Z difference =
3.04; P less than .01). We conclude that clinicians gain information during intrapartum
monitoring that generally leads to improved predictions and increased confidence in
predictions. In this study, hey made more accurate predictions about 5-minute Apgar scores
with electronic fetal monitoring, suggesting that electronic fetal monitoring may provide
better information about neonatal well-being han does periodic auscultation. Improved
information, as measured by clinical predictions, is probably highly valued by patients
and clinicians and may be an important determinant of acceptance of this diagnostic
Morrison, J. C. et al. 1993. "Intrapartum fetal heart rate assessment: monitoring
by auscultation or electronic means." American Journal of Obst Gyn 168:63-6.
OBJECTIVE: Our purpose was to assess the frequency with which auscultation could be used
as the primary mode of fetal assessment during labor in a busy labor and delivery suite by
means of published criteria. STUDY DESIGN: During a 3-month period, 862 patients in labor
with live fetuses between 24 and 43 weeks of gestation were available for auscultation in
the prospective study. Auscultation was initiated during a contraction and extended for 30
seconds after uterine activity ceased. It was repeated every 15 minutes in the first stage
and every 5 minutes in the second stage of labor. RESULTS: In 420 patients this modality
was not begun because of inability of the nurses to meet 1:1 staffing requirements. In 19
patients auscultation was not performed because of obesity (12) or patient refusal (7). Of
the 423 assessed by auscultation 392 were unable to complete monitoring caused by the
frequency requirement (n = 212) or the recording criteria (n = 163). Of the 31 patients
where auscultation was successfully completed, there was a 1:1 nurse ratio during the
entire labor. CONCLUSIONS: Auscultation with stringent evaluation and recording frequency
is not feasible under normal labor and delivery room conditions unless 1:1 nursing care is
always available. Author-abstract.
Prentice, A. and T. Lind. 1987. "Fetal heart rate monitoring during labour--too
frequent intervention, too little benefit?" Lancet 8572:1375-7.
For many obstetricians and midwives continuous electronic fetal heart rate monitoring
during labour has replaced the traditional method of intermittent auscultation. Of the
eight prospective randomised controlled trials designed to assess its value in obstetric
care, four were concerned with mothers defined as being at high-risk, three with normal or
low-risk patients, and the eighth with the total population of a maternity hospital over
several months. None suggested any major advantage of continuous fetal heart rate
monitoring over intermittent surveillance in terms of neonatal mortality, morbidity, cord
blood pH values, or the five minute Apgar score. The rates of caesarean section and
forceps delivery were higher in the continuously monitored group. For low-risk mothers
here is a good case for a return to the traditional method of intermittent auscultation
with its lower false-positive rate, lesser incidence of intervention, and opportunity for
greater contact between the maternity care staff and the mother. Author-abstract. 15 Refs.
Ruderman, J. et al. 1993. "Are physicians changing the way they practise
obstetrics?" Canadian Medical Association Journal 148:409-15.
OBJECTIVE: To examine trends in obstetric interventions in women at low risk over
approximately 3 years. It was postulated that there would be a general reduction in most
intervention rates. DESIGN: Retrospective review of hospital records. SETTING: Three
downtown hospitals of the University of Toronto, in which academic and nonacademic family
physicians and obstetricians practised. PATIENTS: A total of 2365 women in phase 1 (April
1985 to March 1986) and 1277 in phase 2 (May to September 1988) met the inclusion criteria
for grade A (pregnancy at no predictable risk) of the Ontario Antenatal Record at the time
of admission to hospital. OUTCOME MEASURES: Rates of artificial rupture of the membranes,
induction, augmentation, epidural anesthesia, continuous electronic fetal monitoring
(EFM), instrumental delivery, episiotomy and cesarean section. RESULTS: The family
physicians and the obstetricians had significant decreases (p <0.01) over time in the rates of episiotomy, especially mediolateral, and low forceps delivery. The rate of epidural anesthesia decreased significantly in the obstetrician group. The rates of artificial rupture of the membranes, induction and continuous EFM increased in the two physician groups; the increased rate of EFM was significant in the obstetrician group (p < 0.01). There was no significant change in the rates of augmentation, midforceps delivery, vacuum extraction or cesarean section. All of the trends were found to hold when the intervention rates were analysed according to the women's parity. CONCLUSIONS: Some of the findings reflect recommendations and trends reported in the literature, whereas others are not supported by clear medical evidence. The unpredictable nature of the trends suggests that further study is warranted of the reasons for obstetric trends and for the changes in physicians' practice patterns.
Sandmire, H. F. 1990. "Whither electronic fetal monitoring?" Obst Gyn
Largely based on promising animal studies, continuous electronic fetal monitoring (EFM)
was introduced into clinical practice in the early 1970s. After almost 20 years of
experience, it is now apparent hat the anticipated benefits of this technology have not
materialized. Undesirable side effects of EFM include inappropriate operative intervention
for some patients and increased liability for physicians and hospitals, resulting in an
increase in the costs of obstetric services. After reviewing several research studies, The
American College of Obstetricians and Gynecologists concluded that EFM and intermittent
auscultation are equivalent methods for intrapartum assessment. We have developed a
protocol for the performance of intermittent auscultation, including indicated responses
to different levels of bradycardia. This protocol has allowed us to substitute
auscultation for EFM in a high percentage of patients using existing nursing personnel.
Laboring patients should, at a minimum, receive information on both intermittent
auscultation and EFM to enable them to make an informed choice of method for intrapartum
fetal assessment. Author-abstract. 30 Refs.
Shy, K. K. et al. 1990. "Effects of electronic fetal-heart-rate monitoring, as
compared with periodic auscultation, on the neurologic development of premature infants
[see comments]." New England Journal of Medicine 322:588-93.
In a multicenter, randomized clinical trial, we assessed the early neurologic development
of 93 children born prematurely whose heart rates were monitored electronically during
delivery and compared it with that of 96 children born prematurely whose heart rates were
periodically monitored by auscultation. All the children were singletons with cephalic
presentation, and all weighed less than or equal to 1750 g at birth. The mental and
psychomotor indexes of the Bayley Scales of Infant Development (standardized mean score
+/- SD, 100 +/- 16) and a formal neurologic examination were administered at hree
follow-up visits (at 4, 8, and 18 months of age, corrected for gestational age). At 18
months, the mean mental-development scores in the groups receiving electronic fetal
monitoring and periodic auscultation were 100.5 +/- 2.4 and 104.9 +/- 1.8, respectively (P
greater than 0.1). The mean psychomotor-development scores in the wo groups at 18 months
were 94.0 +/- 2.4 and 98.3 +/- 1.8, respectively (P greater than 0.1). The incidence of
cerebral palsy was higher in the electronically monitored group--20 percent as compared
with 8 percent in the group that was monitored by auscultation (P less than 0.03). In the
electronic-fetal-monitoring group (but not in the periodic-auscultation group), the risk
of cerebral palsy increased with the duration of abnormal fetal-heart-rate patterns, as
assessed by retrospective review (chi 2 trend = 12.71, P less than 0.001). The median time
to delivery after the diagnosis of abnormal fetal-heart-rate patterns was 104 minutes with
electronic fetal monitoring, as compared with 60 minutes with periodic auscultation. We
conclude that as compared with a structured program of periodic auscultation, electronic
fetal monitoring does not result in improved neurologic development in children born
Strong, T. H. and D. L. Jarles. 1993. "Intrapartum auscultation of the fetal heart
rate." American Journal of Obstet Gynecol 168:935-6.
A fetal heart rate recording containing a variable deceleration was played for 120
physicians and nurses. Although mean estimates for baseline and nadir of the fetal heart
rate and duration of the deceleration were not significantly different from the actual
values, individual estimates of the three parameters were widely distributed. Adjunctive
techniques for intrapartum fetal heart rate auscultation are recommended. Author-abstract.
Vintzileos, A. M. et al. 1993. "A randomized trial of intrapartum electronic fetal
heart rate monitoring versus intermittent auscultation." Obstetrics & Gynecology
OBJECTIVE: To determine whether continuous intrapartum electronic fetal heart rate
monitoring (EFM) is associated with decreased perinatal mortality and morbidity compared
with intermittent auscultation. METHODS: The study was conducted simultaneously at two
university hospitals in Athens, Greece (Alexandra and Marika Iliadi Hospitals) from
October 1, 1990 to June 30, 1991. All patients with singleton living fetuses and
gestational ages of 26 weeks or greater were eligible for inclusion. The participants were
assigned to continuous EFM or intermittent auscultation based on the flip of a coin. Both
groups were followed during labor according to the most recent ACOG guidelines. However,
fetal scalp blood pH and crossover from one group to the other were not used. RESULTS: A
total of 1428 patients were included, 746 in the EFM group and 682 in the auscultation
group. There were no differences between the groups in erms of maternal age, gravidity,
parity, gestational age, and number of antepartum high-risk factors. More patients
monitored electronically received oxytocin for either augmentation (52.4 versus 38.1%; P =
.0001) or induction (15.6 versus 7%; P = .0001). The length of labor was longer in the EFM
group (first stage 6.1 +/- 4.3 versus 5.5 +/- 3.7 hours; P = .006; second stage 29.4 +/-
18.6 versus 26.9 +/- 16.9 minutes; P = .01). There was a higher incidence of nonreassuring
fetal heart rate patterns in the EFM group (23.4 versus 10.7%; P = .0001) and a higher
rate of surgical intervention (11.2 versus 4.8%; P = .0001). This difference pertained to
both vacuum extraction (5.8 versus 2.4%; P = .002) and cesarean delivery for suspected
fetal distress (5.3 versus 2.3%; P = .005). There were no differences in 1- and 5-minute
Apgar scores, fetal acidosis at birth, need for neonatal resuscitation, neonatal intensive
care unit admission, use of assisted ventilation, neonatal hospital stay, or any other
neonatal complications. Two neonatal deaths occurred in he EFM group and nine perinatal
deaths in the auscultation group (two intrapartum and seven neonatal deaths). The
perinatal mortality rates were 2.6 per 1000 and 13 per 1000 total births, respectively (P
= .04). The two deaths in the EFM group and three of the neonatal deaths in the
auscultation group may not have been prevented by intrapartum monitoring; however, four
neonatal deaths from the auscultation group occurred in depressed (5-minute Apgar scores
less han 7), acidotic (cord artery pH at or below 7.13) infants. The perinatal death rate
related to fetal hypoxia was significantly less in the EFM group (zero of 746 versus six
of 682; P = .03). CONCLUSION: In this controlled trial, intrapartum EFM, as the primary
and only method of intrapartum fetal surveillance, was associated with decreased perinatal
mortality due to fetal hypoxia but also with higher rates of surgical intervention for
suspected fetal distress. Author-abstract.
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