Complications of the Second Stage of Labor

Core Concepts

What defines the second stage

The second stage begins at full dilation. The presenting part descends through the midpelvis, the laboring person feels an urge to push, and the fetal head rotates to an occiput-anterior position in most births, flexes, and crowns. How long this takes varies widely — parity, fetal size and position, regional anesthesia, and pushing technique all play a role. Note: exact time definitions of "prolonged" second stage differ among professional organizations and by facility, so always check current guidelines rather than memorizing one number.

Prolonged second stage and arrest of descent

Prolonged second stage means dilation is complete but descent is slower than expected; arrest of descent means progress has stopped entirely for a defined interval. Common contributing factors include malposition (such as occiput posterior), a large fetus, inadequate contractions, epidural anesthesia that blunts the urge to push, and exhausted or ineffective pushing. The clinical response is usually supportive first — position changes, rest between contractions, continued monitoring — with the option of operative vaginal birth (forceps or vacuum) or cesarean birth if descent cannot be achieved. These decisions belong to the provider, but the nurse's documentation of descent (station), contraction quality, and fetal response supplies the evidence.

Malpositions and malpresentations

Most fetuses enter the second stage occiput anterior, which best fits the pelvis. Occiput posterior (OP) is a common malposition: the head is flexed but faces the maternal back, often producing intense back pain ("back labor") and slower descent; many OP fetuses still rotate and birth vaginally. Malpresentations such as face or brow presentation involve a different presenting part and often obstruct progress. Distinguishing position from presentation matters because the management and the likelihood of vaginal birth differ.

Shoulder dystocia

Shoulder dystocia occurs when the fetal head is born but the anterior shoulder is impacted behind the maternal symphysis pubis, so the body cannot be delivered. It is an emergency that cannot always be predicted; risk factors include fetal macrosomia, maternal diabetes, previous shoulder dystocia, and operative vaginal birth. The classic clinical sign is the "turtle sign" — the head delivers and then retracts against the perineum. Management is a coordinated team response using position and maneuver sequences (for example, McRoberts positioning and suprapubic pressure) designed to free the impacted shoulder. Fundal pressure is not recommended in this situation. Specific steps follow emergency protocols and provider direction; the nurse's jobs include calling for help, supporting the laboring person, and documenting events and times.

Umbilical cord problems in the second stage

A nuchal cord (cord wrapped around the neck) is common and usually managed at birth by the provider. Much more serious is umbilical cord prolapse — the cord slips below or beside the presenting part, where it can be compressed, cutting off fetal blood flow. Prolapse is more likely after membrane rupture with a high or unengaged presenting part. Fetal heart rate patterns (typically prolonged or variable decelerations) may be the first clue. Emergency response focuses on relieving pressure on the cord — elevating the presenting part, positioning the laboring person to shift the fetus off the cord — while preparing for rapid birth. During pushing, mild variable decelerations are common as the head compresses the cord; the nurse evaluates whether they recover and whether they are worsening.

Uterine rupture

Uterine rupture — a tear through the uterine wall — is rare but catastrophic. Risk is highest in a scarred uterus (for example, after a prior cesarean birth), but it can occur in unscarred uteri with strong contractions or trauma. In the second stage it may present as a sudden change in contraction pattern, severe constant abdominal pain, vaginal bleeding, loss of fetal station, or an abrupt nonreassuring fetal heart rate. It is a surgical emergency; the nurse's role is recognition and immediate escalation.

Perineal trauma

Stretching and tearing of the perineum is common in vaginal birth. Lacerations are graded by depth: first degree involves skin/mucosa, second degree adds perineal muscles, third degree extends into the anal sphincter, and fourth degree reaches the rectal mucosa. Episiotomy (a surgical cut) is no longer routine; it is used selectively when clinically indicated. Risk factors for trauma include operative vaginal birth, large fetal size, rapid or prolonged second stage, and primiparity. Perineal trauma matters beyond the birth itself — it affects comfort, healing, and the risk of postpartum hemorrhage and infection, so nurses inspect, document, and teach perineal care.

Maternal exhaustion and ineffective pushing

Pushing is physically demanding, and a laboring person can tire, especially after long labor or heavy sedation/anesthesia. Ineffective pushing — bearing down too early, against a partially dilated cervix, or with poor breath control — wastes energy and slows descent. Supportive nursing measures include repositioning, encouraging rest between contractions, and helping with breathing and positioning techniques. Pushing techniques and their evidence base vary; what matters is individualized coaching and honest documentation.

Common Confusions