Electronic Fetal Monitoring (C-EFM): Interpretation and Clinical Decisions Study Guide

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During pushing, the displayed rate changes from 145 to 105 bpm while the maternal pulse is 104. Compare both signals immediately and independently confirm fetal cardiac activity before calling the change a fetal deceleration or recovery.

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External signal loss persists despite repositioning in a patient with ruptured membranes and active genital herpes lesions. Poor signal does not justify scalp-electrode placement because active lesions are an absolute contraindication. Continue external optimization and promptly confirm fetal cardiac activity independently, using ultrasound when needed.

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An external trace shows small peaks, but palpation identifies firm contractions. Avoid concluding that labor activity is weak from peak height. If quantitative pressure information is clinically needed, evaluate whether an intrauterine pressure catheter is appropriate.

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A laboring patient has normal oxygen saturation but develops hypotension and recurrent late decelerations after neuraxial anesthesia. The likely problem is reduced uteroplacental perfusion, directing attention to blood pressure and positioning rather than routine supplemental oxygen.

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Two patients each have five contractions in ten minutes. One has brief contractions with clear relaxation; the other has long contractions and little resting time. The second pattern provides less opportunity for placental reperfusion despite identical counts.

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When explaining paired cord samples, identify the artery as carrying blood leaving the fetus and the vein as carrying blood returning from the placenta. This direction explains why arterial blood better reflects fetal metabolic condition at birth.

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An abrupt heart rate decrease occurs with a contraction and rapidly recovers. Its timing suggests a reflex response compatible with cord compression. Assess recurrence, duration, recovery and baseline variability before deciding how concerning the overall pattern is.

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Two cord samples have low pH. One mainly shows increased carbon dioxide without a substantial base deficit; the other also has a substantial base deficit. The second supports a metabolic component and requires interpretation with the intrapartum course and newborn assessment.

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A patient with significant bleeding has a saturation of 99% and develops fetal decelerations. The saturation does not dismiss impaired oxygen delivery. Assess blood loss, circulation and oxygen-carrying capacity while the team addresses the underlying hemorrhage.

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Soon after epidural dosing, a supine patient becomes lightheaded, blood pressure falls and late decelerations appear. Reposition laterally, assess maternal circulation and involve anesthesia to correct hypotension while continuously reassessing the fetal response to treatment.

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A ten-minute segment contains several accelerations but three minutes of identifiable rate near 140 bpm. Use the eligible baseline portions to assign 140 bpm rather than averaging the acceleration peaks into an artificially high baseline rate.

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A baseline of 170 bpm persists with moderate variability while the maternal temperature rises. Assess and treat the maternal cause and continue fetal surveillance. The elevated baseline warrants evaluation but does not independently establish category III or fetal acidemia.

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A previously normal rate falls to 80 bpm for four minutes after membrane rupture. Treat this as an acute prolonged deceleration and investigate immediately, including possible cord prolapse, rather than waiting ten minutes to establish a bradycardic baseline.

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The fetal rate rises from 135 to 155 bpm and remains there for twelve minutes. Describe a new baseline of 155 rather than a twelve-minute acceleration, then assess the trend and accompanying clinical findings for its significance.

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Between decelerations, irregular fluctuations span approximately 12 bpm. Record moderate variability. Do not include the full drop into a deceleration when estimating amplitude, because that would incorrectly convert a baseline feature into marked variability for classification.

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Recurrent late decelerations develop while moderate variability persists. Recognize evidence against current metabolic acidemia, address the cause of impaired perfusion and reassess frequently. The reassuring feature supports interpretation but does not justify leaving the recurrent decelerations untreated.

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Variability becomes minimal after an opioid, with no decelerations and a previously reassuring tracing. Consider medication and behavioral state while maintaining surveillance. If recurrent late decelerations appear, reassess promptly rather than attributing every subsequent abnormality to the medication.

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A tracing shows irregular 30-bpm baseline fluctuations during frequent contractions. Verify signal quality, assess contraction frequency and review for decelerations. Document marked variability and category II rather than calling the tracing reassuring because it appears highly active throughout.

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At 30 weeks, an abrupt rise reaches 12 bpm above baseline and lasts twelve seconds. It meets the pre-32-week acceleration definition. The same event at 36 weeks would not meet the standard 15-bpm, 15-second acceleration criteria.

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At term, the rate rises from 140 to 165 bpm for three minutes and then returns to 140. Describe a prolonged acceleration. If the elevated rate instead persists beyond ten minutes, reassess it as a new tachycardic baseline.

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A deceleration reaches its nadir in 18 seconds, despite occurring near the contraction peak. Its abrupt onset supports a variable deceleration rather than an early deceleration. Check the remaining amplitude and duration criteria before completing the description.

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In active labor, gradual decreases begin with contractions, reach their lowest point at each contraction peak and recover as contractions end. With a baseline of 135 and moderate variability, identify early decelerations and continue assessing the full tracing.

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After a blood pressure decrease, gradual decelerations repeatedly reach their nadir after contraction peaks. Identify late decelerations, evaluate maternal perfusion and uterine activity, and reassess whether correcting the hypotension improves the pattern and preserves reassuring baseline variability.

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Abrupt 40-bpm decreases last 45 seconds and occur at different points around contractions. Identify variable decelerations. If they recur with most contractions, evaluate cord-compression contributors, reposition the patient and assess whether further intervention is needed based on the complete pattern.

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Six of ten contractions over twenty minutes have late decelerations. Describe recurrent late decelerations. If three of ten were affected, the pattern would be intermittent, although the severity of any individual event would still require separate assessment.

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The rate falls from 145 to 75 bpm and remains low for three minutes during a sustained contraction. Confirm fetal identity, assess uterine activity and maternal condition, initiate corrective measures and mobilize help while evaluating for an acute obstetric cause.

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A term tracing has a baseline of 145 bpm, moderate variability, occasional early decelerations and no accelerations. With no late or variable decelerations, it meets category I criteria despite the absence of accelerations during this observed segment.

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A patient has recurrent late decelerations with moderate variability. Identify category II, assess blood pressure and contraction frequency, correct likely contributors and follow the trend. Moderate variability informs current risk while persistent late decelerations still require active evaluation.

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The tracing has undetectable baseline variability and late decelerations with most contractions. This meets category III criteria. The team initiates corrective measures immediately and prepares for expedited birth if the abnormal pattern persists despite those interventions during ongoing assessment.

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A smooth, regular oscillation continues for twenty-five minutes in a pregnancy with concern for fetal anemia. Recognize a possible true sinusoidal pattern, obtain urgent specialist evaluation and plan management according to fetal condition rather than documenting marked variability.

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A contraction begins at 10:00, ends at 10:01:30 and the next begins at 10:02. Frequency is every two minutes, duration is ninety seconds and resting time is thirty seconds. The short recovery interval deserves attention alongside fetal response.

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There are eighteen contractions over thirty minutes, distributed evenly across the interval. The average is six per ten minutes, meeting tachysystole criteria. Review uterotonic exposure and fetal response rather than assuming the finding is acceptable because labor is progressing.

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During oxytocin infusion, contractions average seven per ten minutes and recurrent late decelerations appear. Stop the infusion, reposition and assess maternal perfusion while notifying the responsible clinician. Track whether contraction frequency falls and the fetal pattern improves after intervention.

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Blood pressure falls after neuraxial anesthesia and late decelerations develop. Reposition laterally, assess fluid suitability and call anesthesia for prompt correction. If the tracing remains abnormal after pressure improves, investigate ongoing uterine or obstetric causes rather than repeating the same explanation.

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The fetal baseline rises to 175 bpm while maternal temperature reaches 38.6°C. Moderate variability remains present. Evaluate fever and possible infection, initiate indicated maternal treatment and reassess the tracing rather than diagnosing fetal metabolic acidemia from the elevated rate alone.

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A patient has recurrent late decelerations, oxygen saturation of 98% and oxytocin-associated tachysystole. Stop oxytocin and address uterine activity and perfusion. Routine oxygen does not become indicated solely because the tracing is abnormal when maternal oxygenation is already normal.

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A term patient with ruptured membranes and low fluid has recurrent abrupt decelerations despite repositioning. After evaluating for urgent causes, the clinician considers amnioinfusion to reduce cord compression and monitors whether deceleration frequency and severity improve with treatment.

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Oxytocin has been stopped, but prolonged closely spaced contractions and fetal decelerations continue. The team assesses whether acute uterine relaxation is appropriate while preparing additional management and checking for a sentinel obstetric event that would require expedited birth.

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Absent variability and recurrent late decelerations persist after oxytocin cessation, repositioning and correction of hypotension. With vaginal birth not imminent, the team proceeds toward expedited operative birth while maintaining reassessment and communication rather than cycling indefinitely through ineffective corrective measures.

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Immediately after spontaneous membrane rupture, the rate falls to 70 bpm and remains low. The presenting part was previously high. Obtain urgent assessment for prolapse while mobilizing the team and preparing measures to relieve compression if a cord is identified.

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A patient develops constant abdominal pain, a tense tender uterus and a prolonged fetal deceleration with little visible bleeding. Treat concealed abruption as a serious possibility, assess maternal stability and obtain urgent obstetric response rather than waiting for heavier external bleeding.

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During labor after a previous cesarean, an abrupt persistent rate decrease occurs with new abdominal pain and loss of station. Activate emergency obstetric management for suspected rupture while assessing maternal circulation, rather than waiting for a full category III observation interval.

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A growth-restricted fetus in a pregnancy complicated by preeclampsia develops recurrent late decelerations. Recognize limited placental reserve as a plausible contributor, assess reversible stresses and closely evaluate response rather than assuming the normal baseline rate establishes adequate tolerance.

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A postdates patient with low fluid develops abrupt decreases of varying timing and depth. Cord compression is a plausible mechanism. If the decreases instead become gradual and consistently delayed after contraction peaks, reassess for impaired oxygen transfer and perfusion.

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At 32 weeks, a patient with type 1 diabetes develops vomiting, thirst, tachypnea and new minimal variability with decelerations. Check glucose, ketones and acid-base status urgently. Ketosis with low pH/bicarbonate supports metabolic decompensation. During multidisciplinary treatment, compare maternal perfusion and biochemical recovery with fetal variability and decelerations; persistent deterioration requires renewed obstetric assessment.

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At 29 weeks after membrane rupture, ten-by-ten accelerations are present but a new tachycardic baseline and recurrent variables develop. Recognize the accelerations as gestationally appropriate while separately evaluating possible infection and cord compression suggested by the new abnormalities.

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Two twin-monitor channels suddenly show identical accelerations and decelerations after repositioning. Verify that each channel records a different fetus, using independent assessment as needed. Do not document both fetuses as reassuring until separate signal identities have been established.

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The monitor intermittently displays a very rapid regular rate with abrupt transitions, while maternal temperature is normal. Confirm fetal rate and arrange rhythm assessment rather than assuming a fever-related baseline increase or relying on the monitor to diagnose supraventricular tachycardia.

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A persistent slow rate was documented before labor and ultrasound suggests differing atrial and ventricular rates. Seek specialist rhythm interpretation rather than treating the monitor number alone as a new prolonged deceleration, while continuing assessment for superimposed compromise.

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Deep decelerations recur with every pushing effort and recovery becomes slower. Confirm fetal signal identity, reposition and adjust pushing while the clinician assesses whether birth is imminent and whether expedited vaginal or operative delivery is appropriate for the circumstances.

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A fetus initially has brief variables and moderate variability. Later, decelerations lengthen, recovery slows and variability becomes minimal. Escalate reassessment based on the combined deteriorating trend rather than relying on the reassuring appearance of the earlier tracing segment.

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After a prolonged deceleration, the external trace disappears. Obtain immediate bedside assessment and confirmation of fetal cardiac activity while troubleshooting the signal. Do not document fetal demise or assume recovery merely because the monitor no longer displays a rate.

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During auscultation, repeated slowing is heard after contractions in a previously low-risk labor. Reassess maternal and fetal conditions and obtain further monitoring as indicated. Do not document moderate visual baseline variability from the audible rate changes alone.

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At 35 weeks, only one qualifying acceleration occurs in the first twenty minutes without decelerations. Continue the assessment as appropriate and consider permitted stimulation. If the NST remains nonreactive after adequate observation, arrange additional assessment rather than diagnosing acidemia directly.

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During a 30-minute examination, the NST is reactive: 2; one breathing episode lasts 35 seconds: 2; three discrete movements occur: 2; an arm extends and returns to flexion: 2; the deepest fluid pocket is 1.8 cm: 0. Total: 8/10. The failed fluid component needs attention despite the otherwise reassuring behaviors.

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A patient reports substantially less movement than usual despite a reassuring visit yesterday. Arrange current assessment. In a separate intrapartum evaluation, a stimulation-induced acceleration adds reassuring information, while no acceleration would require integration with the other findings rather than a stand-alone diagnosis.

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Paired samples show a lower arterial pH and substantial arterial base deficit compared with the vein. Recognize a fetal metabolic component, verify sample validity and interpret it alongside the labor course and newborn findings rather than relying on venous pH alone.

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After recurrent late decelerations, document baseline, variability, contraction frequency, maternal blood pressure, oxytocin cessation, clinician notification and subsequent response. A quality review can then assess whether recognition and action were timely rather than inferring care from an unexplained category label.

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The team leader directs a named clinician to stop oxytocin. The clinician repeats the instruction, stops the infusion and reports completion; the leader confirms. Meanwhile, another team member communicates the persistent tracing abnormality and the need for bedside obstetric assessment.

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A patient asks to avoid an internal electrode because of procedural concerns. Explain why signal quality is inadequate, discuss expected benefits, risks and available alternatives, and involve the responsible clinician in a shared plan while continuing feasible fetal assessment.