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NCC Certified - Electronic Fetal Monitoring Sample Questions (Q124-Q129):

NEW QUESTION # 124
Tachysystole can have a negative effect on fetal oxygenation during labor by

Answer: C

Explanation:
Comprehensive and Detailed Explanation From Exact Extract NCC-Recommended Sources NCC-recommended physiology references (AWHONN, Simpson & Creehan, Menihan, Creasy & Resnik) consistently state that the primary mechanism by which tachysystole affects fetal oxygenation is reduced uteroplacental perfusion, specifically through impaired intervillous space reperfusion.
During a normal contraction cycle, the fetus receives oxygen between contractions, when the uterus relaxes and maternal blood re-enters the intervillous space. AWHONN's Fetal Heart Monitoring Principles & Practices explains that tachysystole-defined as more than five contractions in 10 minutes averaged over 30 minutes-shortens or eliminates the relaxation phase, preventing adequate placental reoxygenation.
Simpson & Creehan highlight that "tachysystole decreases uteroplacental blood flow and interferes with replenishment of oxygenated maternal blood in the intervillous space." Menihan emphasizes that fetal hypoxemia in tachysystole results from interrupted perfusion, not from altered oxygen transport or maternal hemodynamic changes. Creasy & Resnik confirm that uterine overactivity reduces intervillous perfusion during contractions and impairs fetal oxygen exchange.
Thus, the physiologic problem is failure of the intervillous space to reperfuse, which compromises fetal oxygenation.
References:
AWHONN - Fetal Heart Monitoring Principles & PracticesSimpson & Creehan - Perinatal NursingMenihan
- Electronic Fetal MonitoringCreasy & Resnik - Maternal-Fetal MedicineMiller's Pocket Guide


NEW QUESTION # 125
Maternal conditions of autoimmunity can result in fetal heart block due to antibodies that target:

Answer: B

Explanation:
Comprehensive and Detailed Explanation From Exact Extract-Based NCC C-EFM References:
NCC physiology content specifically includes maternal autoimmune influences on fetal cardiac conduction.
Conditions such as maternal lupus (SLE) or Sjogren's syndrome may produce anti-Ro/SSA and anti-La
/SSB antibodies. These antibodies cross the placenta and damage fetal conduction tissue.
The primary site of injury is the fetal atrioventricular (AV) node, leading to:
* First-, second-, or complete third-degree heart block
* A slow, regular ventricular rate typically 50-70 bpm
* Loss of beat-to-beat variability because ventricular myocardium does not display normal autonomic modulation This mechanism is extensively described in AWHONN, NCC physiology materials, and maternal-fetal physiology texts.
Option A: Antibodies do not target fetal RBCs; that describes hemolytic disease of the newborn.
Option B: Targeting maternal WBCs is not fetal-specific.
The correct affected structure is the fetal AV node.
Therefore, the correct answer is C. The fetal atrioventricular node.
References:NCC C-EFM Candidate Guide (2025); NCC Physiology Content Outline; AWHONN Fetal Heart Monitoring Principles & Practices; Menihan Electronic Fetal Monitoring; Simpson & Creehan Perinatal Nursing; Creasy & Resnik Maternal-Fetal Medicine.


NEW QUESTION # 126
A fetal heart rate tracing is abnormal. A change in maternal position and oxygen administration do not correct the pattern. Following birth, a fetal cord blood sample is taken:
pH = 7.25
PaCO# = 46 mm Hg
PaO# = 20 mm Hg
HCO# = 22 mEq/L
Base deficit = -4 mEq/L
These results are best interpreted as:

Answer: C

Explanation:
Comprehensive and Detailed Explanation From NCC-Aligned Sources:
Normal umbilical arterial values per NCC/AWHONN/Menihan:
* pH: 7.20-7.30
* PaCO#: 45-55 mmHg
* HCO#: 20-24 mEq/L
* Base deficit: 0 to -5 (normal to mild respiratory changes)
This sample shows:
* pH 7.25 # normal
* Base deficit -4 # no metabolic acidosis
* HCO# normal
* Slightly elevated PaCO#, consistent with mild respiratory influence but still normal
* PaO# 20 mmHg is normal for cord arterial blood
This profile is not acidotic (acidosis requires pH <7.10 and base deficit #12).
It also does not indicate hypoxia, which would present with metabolic acidosis.
Therefore: Normal.
References:NCC C-EFM Candidate Guide; AWHONN FHMPP; Menihan; Simpson & Creehan; Creasy & Resnik.


NEW QUESTION # 127
Prenatal diagnosis shows that a fetus has renal agenesis. During delivery, what type of electronic fetal heart rate pattern is most likely to be seen due to a common complication associated with this syndrome?

Answer: C

Explanation:
Comprehensive and Detailed Explanation From NCC-Aligned Sources:
Renal agenesis # severe oligohydramnios (due to absent fetal urine production).
Oligohydramnios causes:
* Cord compression
* Recurrent variable decelerations
* Possible prolonged decels from cord entrapment
This is one of the hallmark FHR complications in renal agenesis.
Why the other options are incorrect:
* A. Heart block - associated with maternal autoimmune antibodies, not renal anomalies.
* B. Late decelerations - associated with uteroplacental insufficiency, not fluid deficiency.
Correct answer: C. Variable decelerations.
References:NCC Physiology & Pattern Recognition; AWHONN FHMPP; Menihan; Simpson & Creehan; Creasy & Resnik.


NEW QUESTION # 128
A characteristic of early decelerations is that they

Answer: A

Explanation:
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


NEW QUESTION # 129
......

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