Fetal Monitoring Techniques — MCQs
Which drug is associated with decreased fetal heart rate during labor?
Variable decelerations are associated with which of the following?
What is considered an abnormal fetal scalp blood pH level that necessitates urgent intervention?
Which of the following statements about chorionic villus sampling is false?
In current obstetrics practice, what is the best test for monitoring sensitized Rh negative mother?
Fetal tachycardia is defined as a heart rate greater than ___ bpm.
Which condition is associated with a sinusoidal heart rate pattern?
A pregnant woman comes at 40 weeks' gestation, with a fundal height measuring 34 cm. USG shows a maximum vertical pocket of liquor less than 2 cm and an AFI of 3 cm. Which of the following statements is false regarding the management of this case scenario?
Lovset manoeuvre is used in delivery of:
When in labor, a diagnosis of occipito-posterior presentation is made. The most appropriate management would be:
Fetal Monitoring Techniques Indian Medical PG Practice Questions and MCQs
Question 1: Which drug is associated with decreased fetal heart rate during labor?
- A. Oxytocin (Correct Answer)
- B. Sodium bicarbonate
- C. IV fluids
- D. Iron
Explanation: ***Oxytocin*** - **Oxytocin** stimulates uterine contractions, which can reduce blood flow to the placenta and temporarily decrease **fetal oxygenation**, leading to **fetal heart rate decelerations**. - Overstimulation of the uterus by oxytocin can result in **tachysystole** (>5 contractions in 10 minutes), potentially causing **fetal hypoxia** and associated changes in fetal heart rate patterns such as late decelerations or bradycardia. *Sodium bicarbonate* - **Sodium bicarbonate** is used to correct metabolic acidosis, but it does not directly affect **fetal heart rate** or uterine activity in a way that causes decelerations. - Its administration is unlikely to impact fetal heart rate unless the underlying condition causing acidosis also affects fetal well-being, which is not a direct drug effect. *IV fluids* - **Intravenous fluids** are often administered during labor to maintain hydration and support maternal circulation, which generally helps improve **fetal well-being** and maintain normal fetal heart rate patterns. - They can help optimize **uterine perfusion**, thereby improving oxygen delivery to the fetus and reducing the risk of fetal distress. *Iron* - **Iron** is essential for red blood cell production and preventing maternal anemia; it has no direct or acute effect on **fetal heart rate** during labor. - Administered as a supplement, iron is not a medication used during labor to impact **uterine contractility** or fetal heart rate in the way oxytocin does.
Question 2: Variable decelerations are associated with which of the following?
- A. Head compression
- B. Uteroplacental insufficiency
- C. Cord compression (Correct Answer)
- D. None of the options
Explanation: ***Cord compression*** - **Variable decelerations** are characterized by an abrupt decrease in fetal heart rate, varying in timing and amplitude relative to uterine contractions. This pattern is classically associated with **umbilical cord compression**. - When the umbilical cord is compressed, blood flow (and thus oxygen delivery) to the fetus is transiently reduced, causing a **baroreflex-mediated vagal response** that slows the heart rate. *Head compression* - **Head compression** typically causes **early decelerations**, which are gradual, symmetrical drops in fetal heart rate that mirror the uterine contraction. - This is due to an increase in **intracranial pressure** leading to a vagal response. *Uteroplacental insufficiency* - **Uteroplacental insufficiency** (e.g., placental abruption, preeclampsia) is associated with **late decelerations**, which are gradual, symmetrical decreases in fetal heart rate that begin after the peak of the contraction and return to baseline after the contraction ends. - This reflects **fetal hypoxemia** due to insufficient oxygen exchange at the placenta. *None of the options* - This option is incorrect because **variable decelerations** specifically indicate **cord compression**, a well-established association in fetal monitoring.
Question 3: What is considered an abnormal fetal scalp blood pH level that necessitates urgent intervention?
- A. pH 7.4
- B. pH 7.3
- C. pH 7.35
- D. pH 7.15 (Correct Answer)
Explanation: ***pH 7.15*** - A fetal scalp blood pH of **7.15** (representing pH <7.20) indicates **significant fetal acidosis** and requires **urgent intervention**, such as expedited delivery. - The critical threshold is **pH <7.20**; values below this suggest **fetal compromise** with high risk of adverse neonatal outcomes, necessitating immediate action. - pH values **<7.15** are considered **severe acidosis** requiring emergency delivery. *pH 7.4* - A pH of 7.4 is considered a **normal** and healthy fetal scalp blood pH (normal range: 7.25-7.35). - This indicates **no acidosis or compromise**, with the fetus being well-oxygenated. *pH 7.3* - A pH of 7.3 is within the **normal range** (7.25-7.35) for fetal scalp blood. - This represents **adequate fetal oxygenation** with no intervention required. *pH 7.35* - A pH of 7.35 is at the **upper end of the normal physiological range** for fetal scalp blood. - This level indicates **excellent fetal oxygenation** and acid-base balance with no interventions required.
Question 4: Which of the following statements about chorionic villus sampling is false?
- A. Can cause limb deformities
- B. Is used for prenatal genetic diagnosis
- C. Villi are collected from chorion frondosum
- D. Is performed only in second trimester of pregnancy (Correct Answer)
Explanation: ***Is performed only in second trimester of pregnancy*** - This statement is false because **chorionic villus sampling (CVS)** is typically performed earlier in pregnancy, specifically during the **first trimester**, usually between 10 and 13 weeks of gestation. - Performing CVS only in the second trimester would negate one of its main advantages: providing earlier genetic diagnostic information than **amniocentesis**. *Is used for prenatal genetic diagnosis* - **CVS** is a primary method for **prenatal genetic diagnosis**, allowing for the detection of chromosomal abnormalities and genetic disorders. - It involves analyzing fetal cells obtained from the **chorionic villi**. *Villi are collected from chorion frondosum* - The sample for **CVS** is indeed collected from the **chorion frondosum**, which is the fetal part of the placenta containing numerous chorionic villi. - These villi are genetically identical to the fetus, making them suitable for **genetic analysis**. *Can cause limb deformities* - There is a recognized, albeit small, risk of **limb reduction defects** associated with CVS, particularly if performed very early in gestation (before 9-10 weeks). - This risk is part of the counseling provided to prospective parents considering the procedure.
Question 5: In current obstetrics practice, what is the best test for monitoring sensitized Rh negative mother?
- A. Biophysical profile
- B. Amniotic fluid spectrophotometry
- C. Middle cerebral artery Doppler wave forms (Correct Answer)
- D. Fetal blood sampling
Explanation: ***Middle cerebral artery Doppler wave forms*** - This is currently the most widely accepted and **non-invasive** method for monitoring **fetal anemia** in Rh-sensitized pregnancies. - An increase in the **peak systolic velocity (PSV)** in the middle cerebral artery indicates that the fetus is increasing cardiac output to compensate for a reduced oxygen-carrying capacity due to anemia. *Biophysical profile* - The biophysical profile assesses various fetal parameters like **movement**, **tone**, **breathing**, and **amniotic fluid volume**, which are often altered late in the course of severe fetal anemia. - It is a **less sensitive** indicator of early or moderate fetal anemia compared to MCA Doppler. *Amniotic fluid spectrophotometry* - This method measures the **bilirubin levels** in amniotic fluid, which correlates with the severity of hemolysis. - It is an **invasive procedure** (amniocentesis) and has largely been replaced by non-invasive MCA Doppler due to associated risks and better predictive value of Doppler. *Fetal blood sampling* - Fetal blood sampling (cordocentesis) provides a direct measurement of **fetal hemoglobin** and other blood parameters. - While definitive, it is a **highly invasive procedure** with significant risks, reserved primarily for confirmation of severe anemia or for direct transfusion, not for routine monitoring.
Question 6: Fetal tachycardia is defined as a heart rate greater than ___ bpm.
- A. 140
- B. 160 (Correct Answer)
- C. 180
- D. 200
Explanation: ***160*** - A fetal heart rate greater than **160 bpm** for more than 10 minutes is defined as **fetal tachycardia**. - This threshold helps differentiate normal variations from sustained elevations, which can indicate fetal distress. *140* - A heart rate of 140 bpm falls within the **normal range** for fetal heart rate, which is typically between 110 and 160 bpm. - This rate does not indicate tachycardia and is usually considered reassuring. *180* - While 180 bpm is certainly tachycardic, the generally accepted clinical definition of fetal tachycardia begins at **160 bpm**. - A heart rate at 180 bpm would be considered **marked tachycardia** and a more urgent finding. *200* - A fetal heart rate of 200 bpm represents **severe tachycardia** and would be a significant indicator of fetal compromise. - The threshold for defining tachycardia is lower at **160 bpm**, making 200 bpm an extreme elevation.
Question 7: Which condition is associated with a sinusoidal heart rate pattern?
- A. Placenta previa
- B. Vasa previa (Correct Answer)
- C. Battledore placenta
- D. Succenturiate placenta
Explanation: ***Vasa previa*** - A **sinusoidal heart rate pattern** is a sign of severe **fetal anemia**, often caused by **fetal hemorrhage**. - In vasa previa, unprotected fetal blood vessels course over the cervical os, making them vulnerable to rupture and leading to **fetal bleeding** and subsequent anemia. *Placenta previa* - This condition involves the **placenta covering the cervical os**, primarily causing **painless vaginal bleeding** in the mother. - The bleeding is **maternal blood**, not fetal blood, so it does not directly cause fetal anemia or a sinusoidal heart rate pattern. *Battledore placenta* - In a battledore placenta, the **umbilical cord is inserted marginally** into the placental disk, rather than centrally. - This anatomical variation is generally a benign finding and is not directly associated with fetal hemorrhage or a sinusoidal heart rate pattern. *Succenturiate placenta* - This involves **one or more accessory placental lobes** located separately from the main placental body. - The main concern is a retained lobe after delivery or vessels connecting the lobes, which can cause bleeding, but it is not specifically linked to a sinusoidal heart rate pattern.
Question 8: A pregnant woman comes at 40 weeks' gestation, with a fundal height measuring 34 cm. USG shows a maximum vertical pocket of liquor less than 2 cm and an AFI of 3 cm. Which of the following statements is false regarding the management of this case scenario?
- A. Do induction if vaginal delivery is not contraindicated
- B. During labour, cord compression is common in these patients
- C. Strict intrapartum fetal surveillance
- D. If cervix is unripe, immediate LSCS should be considered (Correct Answer)
Explanation: ***If cervix is unripe, immediate LSCS should be considered.*** - This statement is **false**. In cases of **oligohydramnios** at term, particularly with a favorable cervix, **labor induction** is generally preferred over immediate C-section. - An unripe cervix does not automatically necessitate an immediate C-section; rather, cervical ripening agents (e.g., prostaglandins) can be used to prepare the cervix for induction. *Do induction if vaginal delivery is not contraindicated* - This is a **correct management strategy** for oligohydramnios at term, provided there are no contraindications to vaginal birth (e.g., placenta previa, severe fetal distress pre-labor). - **Induction** allows for controlled labor and delivery with close fetal monitoring. *During labour, cord compression is common in these patients* - This statement is **true**. **Oligohydramnios** (AFI ≤ 5 cm or maximum vertical pocket < 2 cm) significantly increases the risk of **umbilical cord compression** during labor. - Reduced amniotic fluid means less cushioning protection for the umbilical cord, leading to potential variable decelerations and fetal compromise. *Strict intrapartum fetal surveillance* - This statement is **true** and crucial for managing oligohydramnios during labor. Given the increased risk of **fetal compromise** (e.g., from cord compression), continuous electronic fetal monitoring is essential. - This allows for early detection of **fetal distress** and timely intervention, if necessary.
Question 9: Lovset manoeuvre is used in delivery of:
- A. Arms (Correct Answer)
- B. Head
- C. Breech
- D. Foot
Explanation: ***Arms*** - The Lovset manoeuvre is specifically designed to facilitate the delivery of the **shoulders and arms** in a **breech presentation** when they are extended upwards. - This technique involves rotating the fetal trunk to bring the anterior shoulder under the pubic symphysis, allowing for the gentle extraction of the posterior arm first, followed by the anterior arm. *Head* - Delivery of the head in a breech presentation is typically managed using **Mauriceau-Smellie-Veit manoeuvre** or Piper forceps, not the Lovset manoeuvre. - The Lovset manoeuvre aims to address difficult arm delivery prior to head delivery. *Breech* - While the Lovset manoeuvre is used *during* a breech delivery, it specifically addresses **arm extraction**, not the overall delivery of the entire breech presentation. - The term "breech" refers to the fetal presentation where the buttocks or feet are presented first. *Foot* - If a foot is presenting first, it is usually a **footling breech presentation**, and the delivery of the foot itself does not typically require the Lovset manoeuvre. - The Lovset manoeuvre is reserved for extended arms, which are distinct from the initial presentation of a foot.
Question 10: When in labor, a diagnosis of occipito-posterior presentation is made. The most appropriate management would be:
- A. Emergency CS
- B. Wait and watch for progress of labor (Correct Answer)
- C. Early rupture of membranes
- D. Start oxytocin drip
Explanation: ***Wait and watch for progress of labor*** - Many **occipito-posterior (OP) presentations** will spontaneously rotate to an occipito-anterior (OA) position with ongoing contractions, especially in multiparous women. - Close monitoring of fetal well-being and labor progress is essential, but immediate intervention is not always required. *Emergency CS* - An emergency cesarean section is typically reserved for cases where there is **fetal distress**, **failure to progress** after a reasonable period of observation, or other clear obstetric indications. - An OP presentation alone, without complications, does not warrant an immediate CS. *Early rupture of membranes* - While sometimes used to evaluate cervical dilation or apply a fetal scalp electrode, **early artificial rupture of membranes (AROM)** in OP presentation is not a definitive management strategy. - It may even increase the risk of cord prolapse or ascending infection without necessarily expediting rotation. *Start oxytocin drip* - **Oxytocin augmentation** may be considered if contractions are inadequate and labor is prolonged, but it's not the first-line management for OP presentation itself. - It should only be initiated after assessing the power, passage, and passenger, and ensuring there are no contraindications to augmentation.
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