Foetal Distress

Introduction and Definition of Foetal Distress

Foetal distress refers to the compromised state of a foetus during pregnancy or labour, primarily caused by an inadequate supply of oxygen. This oxygen deprivation, known clinically as intrauterine hypoxia, leads to metabolic acidosis if prompt corrective action is not taken. Nurses in Nigerian maternity wards must recognise that this term describes a clinical syndrome rather than a single diagnosis. Early identification prevents permanent neurological damage, stillbirth, or neonatal morbidity. The condition can develop gradually over weeks due to placental insufficiency or strike suddenly during labour contractions.

Pathophysiology and Causes of Intrauterine Hypoxia

Intrauterine hypoxia occurs when the oxygen transfer from the maternal circulation through the placenta to the foetus is disrupted.

• Maternal factors: Severe hypotension, maternal anaemia, and severe asthma or cardiac disease reduce oxygen delivery to the intervillous space.
• Placental factors: Placental abruption, placenta praevia, and post-term pregnancies compromise blood exchange.
• Foetal factors: True knots in the umbilical cord, nuchal cords, and severe intrauterine growth restriction limit the foetus's ability to tolerate stress.

Clinical Signs and Symptoms

Recognising foetal distress requires careful monitoring of both maternal observations and foetal parameters.

• Meconium-stained liquor: The passage of thick green or yellow meconium into the amniotic fluid indicates foetal hypoxia, which relaxes the anal sphincter.
• Foetal heart rate abnormalities: Tachycardia (baseline above 160 beats per minute) often acts as an early sign of stress, while severe bradycardia (below 110 beats per minute) indicates profound hypoxia.
• Reduced foetal movements: Mothers often report a sudden decrease or cessation of kicks and rolls.

Intrapartum Monitoring and Diagnostic Techniques

Midwives and nurses utilise various tools to evaluate foetal well-being during labour. Intermittent auscultation using a Pinard stethoscope or a Doppler ultrasound device is standard in many low-resource settings. Continuous electronic foetal monitoring (EFG), via cardiotocography (CTG), traces the foetal heart rate alongside uterine contractions. A normal CTG tracing shows moderate variability and accelerations. Late decelerations—where the heart rate drops after the peak of a contraction—are a classic warning sign of uteroplacental insufficiency.

Immediate Nursing Interventions and Resuscitation Measures

When signs of foetal distress appear, the nurse must act rapidly to reverse hypoxia before resorting to operative delivery.

1. Change maternal position: Turn the patient onto her left lateral side to relieve pressure from the gravid uterus on the inferior vena cava.
2. Administer oxygen: Provide high-flow oxygen via a tight-fitting face mask to boost maternal saturation.
3. Intravenous fluid bolus: Infuse a rapid bolus of isotonic fluids like normal saline to correct maternal hypotension.
4. Stop oxytocin: If oxytocin infusion is running, discontinue it immediately to reduce uterine contraction frequency and allow placental refilling.

Medical and Surgical Management

If conservative nursing resuscitation measures fail to resolve foetal distress within a short window, medical and surgical teams must intervene. Preparation for an emergency caesarean section is initiated without delay if vaginal delivery is not imminent. Scalp pH sampling can sometimes be performed to assess foetal blood gas status if available. Paediatric and neonatal nursing teams must be alerted to attend the delivery, ready to provide immediate neonatal resuscitation upon birth.

Potential Complications and Outcomes

Unresolved foetal distress carries grave short-term and long-term consequences for the neonate. Severe hypoxia leads to hypoxic-ischaemic encephalopathy (HIE), multi-organ failure, and meconium aspiration syndrome. Long-term neurological sequelae such as cerebral palsy and developmental delays can stem from prolonged intrapartum asphyxia. Timely nursing intervention remains the cornerstone of preventing these devastating outcomes in clinical practice.