Antenatal Care Examination and Leopold's Maneuvers
Examination of an Antenatal Patient
This section provides an in-depth guide to the examination of an antenatal patient, essential for medical students, residents, and practicing obstetricians. It includes general physical assessments and Leopold's maneuvers, beneficial for medical students at various levels, enhancing their clinical skills.
General Physical Examination
Weight
Present Weight: Measure and record the patient's current weight using a calibrated scale at each visit to monitor weight gain trends during pregnancy. Document any significant deviations from expected weight gain.
Pre-pregnancy Weight: Accurately record the patient's pre-pregnancy weight from patient recall or previous medical records, as it is crucial for determining BMI and appropriate weight gain during pregnancy. This baseline weight helps in assessing the risk of gestational diabetes and pre-eclampsia.
Previous Antenatal Visits: Review past records for weight measurements to assess the pattern and rate of weight gain. Pay close attention to sudden increases or plateaus, which may indicate complications such as edema or fetal growth issues.
Height
Measure the patient's height in centimeters using a stadiometer to evaluate the risk of cephalopelvic disproportion. Short stature may necessitate further assessment, including pelvimetry if vaginal delivery is planned.
Short Stature Definition: In the Indian context, short stature is typically defined as a height less than 140-145 cm. A height below this range indicates a higher risk of cephalopelvic disproportion. Consider referral for specialized obstetric care if the patient falls into this category. \text{Height} < 140-145 \text{ cm}
Body Mass Index (BMI)
Calculate the patient's BMI using her pre-pregnancy weight and height to categorize her weight status (underweight, normal, overweight, or obese). Use the formula: BMI = weight (kg) / height (m)^2.
Significance: BMI helps determine the appropriate weight gain during pregnancy, influencing maternal and fetal outcomes. It is a key factor in managing gestational weight gain and preventing complications like gestational diabetes, pre-eclampsia, and fetal macrosomia.
General Appearance
Assess for signs of pallor (anemia), icterus (jaundice), cyanosis (hypoxia), lymphadenopathy (infection or malignancy), and edema to identify underlying health issues. Document any skin changes, such as melasma or linea nigra.
Edema Assessment Sites:
Medial malleolus
Anterior tibia
Sacrum
Anterior abdominal wall
Physiological vs. Pathological Edema
Physiological Edema:
Reasons:
Fluid retention (approximately 6.5 liters of water retained during pregnancy) to support increased blood volume and amniotic fluid. This is a normal adaptive response to pregnancy.
Gravid uterus pressing on lymphatic vessels, obstructing lymphatic drainage, particularly in the lower extremities.
Characteristics:
More common in dependent areas (lower limbs in ambulatory individuals, sacrum in bedridden individuals).
Tends to subside with rest due to improved venous return and lymphatic drainage. Elevating the legs can also alleviate symptoms.
Worsens as the day progresses, more noticeable in the evening due to prolonged standing or sitting.
More prevalent in the third trimester as the uterus enlarges and compresses pelvic vessels. Monitor blood pressure regularly to rule out pre-eclampsia.
Pathological Edema:
Characteristics:
May be present on the anterior abdominal wall or face, indicating systemic involvement and the need for further investigation.
Does not improve significantly with rest, suggesting underlying pathology. Evaluate for proteinuria and hypertension.
Persists throughout the day.
Can occur in any trimester and may indicate pre-eclampsia, cardiac, or renal issues. Requires immediate medical attention and further diagnostic testing.
Patient Comfort
Assess and document the patient's comfort level at rest to identify potential underlying issues. Inquire about pain, contractions, or any other discomfort.
Reasons for Discomfort:
Uterine overdistension due to multiple gestations or polyhydramnios. Manage symptoms with appropriate interventions such as amnioreduction in severe cases.
Existing heart conditions (NYHA class III and IV) that exacerbate symptoms during pregnancy. Requires close monitoring by a cardiologist and potential adjustments in medical management.
Breast Examination
Conduct a thorough breast examination to detect abnormalities such as retracted nipples, cracks, or fissures, which may affect breastfeeding. Palpate for any lumps or masses.
Abnormal Findings: Document any identified cracks, fissures, or retracted nipples to address potential problems proactively. Provide education on proper breastfeeding techniques and consider referral to a lactation consultant.
Per Abdominal Examination
Prerequisites
Empty Bladder: Ensure the patient empties her bladder before the examination for accurate palpation and patient comfort. This reduces the risk of mistaking the bladder for other structures.
Explanation and Consent: Explain the examination procedure in the patient's local language to ensure understanding and obtain implied consent. Address any concerns or questions the patient may have.
Warm Hands: Warm your hands before touching the patient to enhance comfort during palpation. Use warm water or gloves if necessary.
Gentle Approach: Employ a gentle and empathetic approach to reduce anxiety and discomfort during the examination. Maintain eye contact and provide reassurance.
Patient Positioning
Instruct the patient to lie in a dorsal position with her knees flexed to relax abdominal muscles and facilitate examination. Place a small pillow under her head for added comfort.
Adequate Exposure: Expose the area from the xiphisternum to the pubic symphysis while ensuring the rest of the body is covered for patient privacy and comfort. Use a drape to maintain dignity.
Inspection
Abdominal Distension: Observe whether the abdomen is distended longitudinally or transversely to derive the lie of the fetus. Transverse distension suggests a transverse lie, requiring further evaluation.. Document any asymmetry.
Abdominal Wall Edema: Check for edema on the abdominal wall, which may suggest underlying pathology such as pre-eclampsia or fluid retention. Palpate for pitting edema.
Umbilicus Status: Note the status of the umbilicus (typically everted) as it can provide insights into abdominal pressure. An inverted umbilicus may suggest decreased amniotic fluid or fetal growth restriction.
Flanks: Palpate the fullness of the flanks to estimate gestational age. Full flanks indicate a 40-week gestation, while non-full flanks suggest a 32-week gestation. This is a rough estimate and should be correlated with other findings.
Scars, Sinuses, and Veins: Inspect for any scars, sinuses, or distended veins, documenting their presence or absence. Scars may indicate previous surgeries, while distended veins may suggest increased abdominal pressure.
Subumbilical Area: Observe whether the subumbilical area is flattened, which can indicate an occipital posterior position or breech presentation. Correlate with Leopold's maneuvers.
Linea Nigra: Document the presence of the linea nigra, a dark pigmented line from the umbilicus to the pubic symphysis, caused by melanocyte-stimulating hormone. Note its length and intensity.
Striae Gravidarum: Assess and document the presence of stretch marks (striae gravidarum) on the abdomen. Note their color (red or white) and distribution, as they indicate the degree of abdominal stretching.
Palpation
Uterine Centralization: Centralize the uterus prior to palpation, as it naturally dextrorotates during pregnancy. This ensures accurate fundal height measurement.
Fundal Height Measurement: Measure the fundal height to correlate with gestational age. Use a flexible measuring tape and document the measurement in centimeters.
Abdominal Girth Measurement: Measure the abdominal girth at the level of the umbilicus to monitor fetal growth and amniotic fluid volume. This can help detect polyhydramnios or oligohydramnios.
Symphysiofundal Height Measurement: Measure the symphysiofundal height to estimate gestational age and fetal growth. This is a key component of the abdominal examination.
Symphysiofundal Height Measurement Technique
Centralize the uterus to ensure accurate measurement.
Use the ulnar border of your hand to palpate from the xiphisternum downwards to identify the fundal height. Mark the point where the fundus is palpated.
Mark both the fundal height and the level of the pubic symphysis.
Measure from the pubic symphysis to the fundal height using the centimeter side of a measuring tape. Between 24 to 36 weeks, the symphysiofundal height typically corresponds to the gestational age in weeks. Document the measurement in centimeters.
Significance of Symphysiofundal Height
Helps in determining gestational age, particularly when the patient is uncertain about her dates. Correlate with ultrasound findings for accuracy.
Assesses whether the symphysiofundal height corresponds with gestational age, indicating normal fetal growth. Deviations may indicate growth abnormalities.
Conditions Where Symphysiofundal Height Measurement is Insignificant
Transverse Lie: Fetal position affects measurement accuracy. Confirm fetal lie with Leopold's maneuvers or ultrasound.
Overdistended Uterus: Conditions like polyhydramnios or multiple gestations distort the measurement. Consider ultrasound for accurate assessment.
Known Case of Fibroid: Uterine fibroids can alter the size and shape of the uterus. Document the presence and size of fibroids.
Reasons for Discrepancies in Symphysiofundal Height
Height More Than Expected:
Inaccurate Dates: Incorrect estimation of the last menstrual period. Verify dates with early ultrasound.
Full Bladder: Bladder distension affects uterine position and measurement. Ensure the patient empties her bladder before examination.
Multifetal Pregnancy: Multiple fetuses increase uterine size. Confirm with ultrasound.
Polyhydramnios: Excessive amniotic fluid. Assess with amniotic fluid index (AFI) via ultrasound.
Concealed Abruption: Blood accumulation increases uterine size. Monitor for abdominal pain and bleeding.
Molar Pregnancy: Abnormal growth of trophoblastic tissue. Requires urgent evaluation and management.
Macrosomia: Large-for-gestational-age fetus. Assess with ultrasound and consider gestational diabetes screening.
Diabetes: Maternal diabetes contributing to fetal macrosomia. Manage maternal glucose levels.
Height Less Than Expected:
Intrauterine Growth Restriction (IUGR) / Fetal Growth Restriction: Impaired fetal growth. Assess with serial ultrasounds and Doppler studies.
Intrauterine Death: Fetal demise. Confirm with ultrasound and absence of fetal heart tones.
Pregnancy-Induced Hypertension (PIH): Affects placental perfusion and fetal growth. Monitor blood pressure and proteinuria.
Oligohydramnios: Reduced amniotic fluid. Assess with amniotic fluid index (AFI) via ultrasound.
Premature Rupture of Membranes (PROM): Loss of amniotic fluid. Confirm with sterile speculum examination and amniotic fluid testing.
Leopold's Maneuvers (Obstetrical Grips)
Essential for medical students at all levels. Mastery of these maneuvers enhances diagnostic accuracy.
Performed per abdomen after confirming that the patient has emptied her bladder. Ensure the patient is comfortable and relaxed.
Position yourself on the right side of the patient to maintain consistency and ease of palpation.
Consists of four maneuvers; the first three are conducted facing the patient's face, whereas the fourth is performed facing the patient's feet. Each maneuver provides unique information about fetal lie, presentation, and position.
First Maneuver: Fundal Grip
Technique: Place both hands on the fundal area of the uterus to palpate the fetal part occupying the fundus. Gently palpate to avoid discomfort.
Information Gained:
Lie:
Empty fundal grip indicates a transverse lie. Confirm with ultrasound.
Feeling a fetal part indicates a longitudinal lie. Proceed to determine the presentation.
Presentation:
A broad, irregular, soft part indicates buttocks (breech presentation). Prepare for potential breech delivery or Cesarean section.
A hard, firm, globular part indicates the head (cephalic presentation). Proceed to determine the position.
Second Maneuver: Lateral (Umbilical) Grip
Technique: Move hands from the fundus to the lateral sides of the uterus. Stabilize the fetus using one hand while palpating with the other to determine the location of the fetal back. Apply gentle pressure.
Information Gained:
Position:
A smooth, curved, rigid structure indicates the back of the fetus, which determines the position (e.g., back on the left indicates LOT, LOA, or LOP). This helps in planning the delivery approach.
Multiple small, knob-like structures indicate the limbs of the fetus. Differentiate between limbs and other fetal parts.
Third Maneuver: Pollic Grip
Technique: Use a single hand (right hand) to palpate the pelvic area and assess the presenting part. Gently grasp the presenting part between your thumb and fingers.
Information Gained:
Presentation:
A hard, globular, firm structure indicates the head (cephalic presentation). Confirm that the head is the presenting part.
Assess whether the head is ballotable, meaning it is movable from side to side, indicating it has not yet entered the pelvis. This helps in determining the stage of labor.
Fourth Maneuver: Deep Pelvic Grip
Technique: Face the patient's feet and place both hands parallel to the inguinal ligament to determine the descent of the presenting part into the pelvis. Apply gentle pressure to assess the fetal head.
Information Gained:
Confirms the findings of the third maneuver regarding the presentation. Ensure consistency between maneuvers.
Determines if the head has descended into the pelvis:
Converging hands below the head indicate the head has not entered the pelvis. Prepare for potential complications.
Determines the attitude of the fetal head (flexion, deflexion, or extension). This is crucial for assessing the progress of labor.
Attitude of Fetal Head
Definition: Describes the relationship between different parts of the fetus. Attitude affects the diameter of the presenting part.
Most Common Attitude: Flexion (head, hands, and legs flexed), which facilitates easier passage through the birth canal. A flexed attitude presents the smallest diameter of the fetal head.
Landmarks on Fetal Head:
Sensiput and Occiput:
Sensiput: The part where the frontal bones meet the face, anterior to the diamond-shaped anterior fontanelle. Palpate to identify the degree of flexion.
Occiput: The part below the posterior fontanelle, posterior to the triangular-shaped posterior fontanelle. Palpate to identify the degree of flexion.
Assessing Attitude with Fourth Maneuver
Attitude assessment during the fourth maneuver involves palpating the synciput and occiput in relation to each other.
Well-Flexed Head:
Occiput felt at a lower level, and synciput at a higher level on per abdominal examination. Indicates optimal flexion and easier passage through the birth canal.
Occiput and synciput are felt on opposite sides, indicating optimal flexion.
Extended Head:
Occiput felt at a higher level, and synciput at a lower level on per abdominal examination. Indicates extension and potential difficulty in delivery.
Occiput and synciput are felt on the same side, indicating extension.
Deflexed Head:
Occiput and synciput felt at the same level on opposite sides, indicating deflexion. May lead to prolonged labor.
Summary of Fourth Maneuver's Role
Confirms the presentation of the fetus. Correlate with findings from other maneuvers.
Determines the degree of descent of the presenting part into the pelvis. Helps in assessing the progress of labor.
Determines the attitude of the fetus, which is crucial for assessing the progress of labor. An abnormal attitude may require intervention.