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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Pattern Recognition and Intervention | 70% | - Clinical decision-making and interventions - Fetal heart rate patterns classification - Tracing evaluation and management - Interpretation per NICHD standards |
| Topic 2: Physiology | 11% | - Uteroplacental function - Fetal cardiovascular physiology - Factors affecting fetal oxygenation |
| Topic 3: Electronic Monitoring Equipment | 5% | - Proper application and use - Calibration and accuracy - Troubleshooting artifacts |
| Topic 4: Professional Issues | 5% | - Legal and ethical aspects - Documentation standards - Safety and quality improvement |
| Topic 5: Fetal Assessment and Methods | 9% | - Indications for monitoring - Auxiliary assessment techniques - Correlation with clinical status |
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質問 # 124
A characteristic of early decelerations is that they
正解：B
解説：
Comprehensive and Detailed Explanation From Exact Extract (No URLs or Links):
Early decelerations are defined in NCC and AWHONN resources as gradual, uniform decelerations that mirror uterine contractions and are associated with fetal head compression. AWHONN's Fetal Heart Monitoring Principles states: "Early decelerations are a benign pattern caused by vagal stimulation secondary to fetal head compression." Menihan similarly notes: "The mechanism of early decelerations is a vagal reflex response; they do not reflect hypoxia." They are periodic, not episodic, because they occur with contractions-which rules out option A.
They typically remain within a normal heart rate range and do not usually fall below 100 bpm; this eliminates option C. NCC Candidate Guide emphasizes that early decelerations are considered a normal physiologic response, not a pathologic pattern, and are categorized as "Category I" when variability is present.
Thus, the correct characteristic is that they are caused by a vagal reflex, making B the correct answer.
References:AWHONN Fetal Heart Monitoring ProgramMenihan: Electronic Fetal MonitoringSimpson & Creasy: Fetal PhysiologyNCC C-EFM Content Domains - Physiology
質問 # 125
Maternal fever can cause fetal tachycardia because the increased maternal temperature:
正解：C
解説：
Comprehensive and Detailed Explanation From Exact Extract-Based NCC C-EFM References:
Maternal hyperthermia-most commonly from infection-causes a rise in fetal temperature, which increases fetal metabolic rate. The fetus responds by increasing heart rate to meet the increased oxygen demand.
Effects include:
* Increased fetal oxygen consumption
* Enhanced fetal cardiac output
* Resultant tachycardia, often 160-180 bpm
This mechanism is repeatedly outlined in NCC's physiology domain, AWHONN, Menihan, Simpson, and Creasy & Resnik.
Option A is incorrect because maternal fever does not reduce perfusion.
Option C is incorrect because catecholamines are often elevated, not inhibited.
Thus, the mechanism is increased fetal metabolism.
References:NCC C-EFM Candidate Guide; NCC Physiology Domain; AWHONN Fetal Heart Monitoring Principles & Practices; Menihan Electronic Fetal Monitoring; Simpson & Creehan Perinatal Nursing; Creasy
& Resnik Maternal-Fetal Medicine.
質問 # 126
In the event of recurrent variable decelerations with thick meconium, amnioinfusion is recommended to:
正解：B
解説：
Comprehensive and Detailed Explanation From Exact Extract-Based NCC C-EFM References:
Amnioinfusion is considered an intrauterine resuscitative intervention used specifically for recurrent variable decelerations caused by cord compression. NCC, AWHONN, Miller, and Menihan consistently teach that variables occur when the umbilical cord becomes compressed, reducing fetal oxygenation. When oligohydramnios or decreased amniotic fluid volume is present, the cord is more vulnerable to compression.
Why amnioinfusion is used:
Amnioinfusion works by:
Increasing intraamniotic fluid volume
Reducing umbilical cord compression
Decreasing the frequency and severity of variable decelerations
This directly targets the pathophysiology behind recurrent variables.
Why the other options are incorrect:
A). Dilute thick meconium - NOT supported by NCC
Historically, amnioinfusion was studied for meconium dilution, but major organizations-including NCC- aligned sources-state that amnioinfusion is NOT recommended for the sole purpose of diluting meconium. It does not reduce meconium aspiration syndrome and is no longer indicated for that purpose.
B). Restore uterine blood flow - NOT accurate
Uterine blood flow is addressed through maternal positioning, fluid bolus, reducing uterine tachysystole, and minimizing vasoconstriction-not via amnioinfusion. Amnioinfusion does not physiologically affect uterine perfusion.
C). Treat oligohydramnios - CORRECT
Recurrent variables with thick meconium often occur in the setting of low fluid, which worsens cord compression.
NCC-recommended indications include:
Recurrent variable decelerations unresponsive to repositioning
Suspected or confirmed oligohydramnios
Thick meconium may be associated with low fluid, but the purpose of amnioinfusion is to alleviate cord compression by restoring fluid volume, not to dilute the meconium.
Thus, the correct answer is C. Treat oligohydramnios.
References:
NCC C-EFM Candidate Guide (2025); NCC Content Outline; AWHONN Fetal Heart Monitoring Principles
& Practices; Miller's Fetal Monitoring Pocket Guide; Menihan Electronic Fetal Monitoring; Simpson & Creehan Perinatal Nursing; Creasy & Resnik Maternal-Fetal Medicine.
質問 # 127
A woman in active labor at 8 cm experiences spontaneous rupture of membranes and acute bright red vaginal bleeding. The uterus is soft and nontender to palpation. The fetal monitor tracing has been normal and now shows tachycardia followed by bradycardia with minimal variability. The maternal blood pressure is 130/76 mm Hg, and the pulse is 86 beats per minute. The most likely cause of these findings is:
正解：B
解説：
Comprehensive and Detailed Explanation From Exact Extract-Based NCC C-EFM References:
When bright red vaginal bleeding occurs at the moment of membrane rupture, accompanied by an acute, severe fetal heart rate deterioration, NCC sources emphasize considering conditions causing fetal hemorrhage rather than maternal instability.
The key features in this scenario:
* Timing:Bleeding occurs immediately with spontaneous rupture of membranes-this is classic for vasa previa rupture, where fetal vessels traverse membranes and are torn when the membranes rupture.
* Bleeding characteristics:Bleeding is acute, bright red, and sudden.In vasa previa, the blood observed vaginally is fetal blood, not maternal blood.
* Uterine exam:The uterus is soft and nontender, which strongly argues against abruptio placenta, where the uterus is typically firm, rigid, or painful.
* Maternal vital signs:Maternal blood pressure and pulse are normal, indicating no maternal hypovolemia.In placental abruption or placenta previa with significant maternal bleeding, maternal vitals are often abnormal.Here, the mother is stable, meaning the blood is not maternal-supporting fetal vessel rupture.
* Fetal heart rate pattern:
* Initial tachycardia, followed by
* Bradycardia with minimal variabilitySuch a pattern is consistent with acute fetal blood loss, which rapidly leads to fetal hypovolemia and hypoxia.
* Differential based on NCC-aligned physiology:
A). Abruptio placenta - NOT supported
Typically presents with:
* Painful bleeding
* Firm, tender uterus
* Maternal tachycardia
* Uterine irritabilityNone of these are present.
B). Placenta previa - NOT supported
Classically painless bright red bleeding before or early in labor, not triggered by membrane rupture.
Fetal compromise is less sudden unless maternal shock occurs, which is not the case here.
C). Ruptured vasa previa - CORRECT
Defined by:
* Painless, sudden bright red bleeding at ROM
* Normal maternal vital signs
* Rapid fetal deterioration (tachycardia # bradycardia # minimal variability)
* Soft, nontender uterusThis fits the scenario exactly.
Therefore, the most likely cause is ruptured vasa previa, a recognized obstetric emergency described across AWHONN, NCC C-EFM references, and maternal-fetal physiology texts such as Menihan and Creasy & Resnik.
References:NCC C-EFM Candidate Guide (2025); NCC Content Outline; AWHONN Fetal Heart Monitoring Principles & Practices; Miller's Fetal Monitoring Pocket Guide; Menihan Electronic Fetal Monitoring; Simpson & Creehan Perinatal Nursing; Creasy & Resnik Maternal-Fetal Medicine.
質問 # 128
Patient safety is enhanced when alarms:
正解：C
解説：
Comprehensive and Detailed Explanation From NCC-Aligned Sources:
NCC and AWHONN emphasize unit-wide shared responsibility for:
* Recognizing abnormal maternal or fetal findings
* Calling for help
* Triggering emergency responses (e.g., unit huddle, rapid response, safety pathways) Safety culture requires:
* Any staff member (RN, tech, provider) to initiate an alarm or escalate concern
* No hierarchy delay
* Rapid action when fetal compromise is suspected
Why the other answers are wrong:
* A. Determined by unit leaders # incorrect; safety is team-wide, not hierarchical.
* C. Occur infrequently # false; alarms must occur whenever needed, not limited.
Correct answer: B. Can be called by anyone.
References:NCC Professional Issues Domain; AWHONN Standards for Professional Practice; Perinatal Safety Bundles; Simpson & Creehan.
質問 # 129
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