Prolonged labor

Key takeaways

Prolonged labor belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Prolonged labor to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Prolonged labor from memory before moving on to harder problems.

Reference excerpt

Prolonged labor is the inability of a woman to proceed with childbirth upon going into labor. Prolonged labor typically lasts over 20 hours for first time mothers, and over 14 hours for women that have already had children. Failure to progress can take place during two different phases; the latent phase and active phase of labor. The latent phase of labor can be emotionally tiring and cause fatigue, but it typically does not result in further problems. The active phase of labor, on the other hand, if prolonged, can result in long term complications. It is important that the vital signs of the woman and fetus are being monitored so preventive measures can be taken if prolonged labor begins. Women experiencing prolonged labor should be under supervision of a surgically equipped doctor. Prolonged labor is determined based on the information that is being collected regarding the strength and time between contractions. Medical teams track this data using intrauterine pressure catheter placement (IUPC) and continuous electronic fetal monitoring (EFM). IUPC is a straw that is inserted into the womb with a monitor that reads when contractions are coming and how strong they are. EFMs are used to track the fetal heart rate. If either devices indicate that vital signs are off and prolonged labor is beginning, it is important that the medical team begin discussing treatment and alternative options for delivery. Prolonged labor can result from a variety of different issues, such as fetal malpresentation, issues with uterine contractions, cervical dystocia or stenosis, and cephalopelvic disproportion. Both fetal malpresentation and cervical dystocia may result in obstructed labor. The cause of prolonged labor will determine the medical intervention that needs to take place. Medical professionals can either engage in preventive measures or turn to surgical methods of removing the fetus. If not handled properly or immediately treated, both the woman and the fetus can suffer a variety of long term complications, the most serious of which is death. There is no "quick fix" to prolonged labor, but there are preventive measures that can be taken, such as oxytocin infusions. In order to properly and safely deliver the baby, doctors will often intervene in child birth and conduct assisted vaginal delivery through the use of forceps or a vacuum extractor, or perform a Caesarean section.

Signs and symptoms Symptoms include:

Labor extends beyond 18 hours Dehydration and exhaustion of the mother Pain around the back, sides, and thighs of the mother as a result of extreme muscle pressure Severe pain when labor begins Increased heart rate of the mother Swollen large intestine on either side of the uterus as a result of gas build up Uterus sensitivity Ketosis Distress of the fetus Uterine ruptures

Complications Distress to the fetus as a result of decreasing oxygen levels Internal bleeding of the fetus's head (intracranial hemorrhage) Higher chance of operative delivery Risks of long-term injuries to the infant such as hypoxic-ischemic encephalopathy (HIE) or cerebral palsy Infection of the uterus Damage to the birth canal Postpartum infection Postpartum hemorrhage

Prolonged latent labor The term describes labor that occurs very slowly. This does not necessarily mean that the woman or fetus's health is being compromised, but it is painful and is an important indication for doctors to pay attention to warning signs of prolonged labor.

Prolonged active labor The phase of labor that extends into multiple hours (at least 14). The cervix usually dilates to over 4 cm before active labor occurs. When it first begins, it is encouraged that women stand up, walk around, and eat or drink. If failure to progress extends beyond this point, preventive measures need to be taken.

Causes

Fetal malpresentations Fetal malpresentations are irregular positions of the crown of the fetal head in relation to the mother's pelvis (the fetus is in an abnormal position). Some important ways to manage fetal malpresentation are making rapid evaluations of the condition of the women pertaining to vital signs as well as the heart rate of the fetus. If fetal heart rate is abnormal, and if membranes have ruptured and amniotic fluid is atypical, it is important for medical professionals to determine the presenting part of the fetus and the position of the fetal head. Possible delivery methods, if this is the case, are compound presentation, vaginal breech delivery, or caesarean section for breech presentation depending upon the severity of the malposition.

Uterine contractions This refers to uterine conditions that result in the uterus not having enough coordination or strength to dilate the cervix and push the baby through the birth canal. Issues with uterine contractions are the main cause of prolonged labor during the latent phase. Contractions may not occur as of a result of uterine tumors. In addition, if the uterus is stretched, usually due to previous pregnancies or multiple gestation, contractions may be difficult. Irregular or weak contractions can be fixed through stimulation of the uterus or oxytocin infusions. Lack of contractions may be caused by an overwhelming amount of painkillers or anesthesia, by which the medications should be discontinued. In this case, it is appropriate for assisted vaginal delivery to be conducted.

Cervical stenosis Cervical dystocia, or stenosis, occurs when the cervix fails to dilate after a practical amount of time during positive uterine pains. The main problems in cervical dystocia is the lack of uterine inertia and cervical abnormalities, which prevent the cervix from fully dilating. It is very typical of patients that have hypopituitarism. There are many preexisting complications that may result in stenosis. Common conditions that lead to stenosis are tumors, a full bladder, large size of the infant, multiple pregnancies, delay in rupture of membranes, or problems with the cervix. High stress may interfere with the progression of pregnancy in cases such as these, leading to prolonged labor.

… excerpt ends here. Continue reading the full article.

Illustrations

Worked examples

Example 1 — a first encounter with Prolonged labor

Start with the simplest possible case. Write down what Prolonged labor claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Prolonged labor before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Prolonged labor ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Prolonged labor

In research: Prolonged labor appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Prolonged labor in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Prolonged labor is common in secondary-school and first-year university syllabi. It links to neighbouring topics Childbirth, Complications of labour and delivery, Midwifery, so understanding it makes those chapters shorter.
In everyday life: Look for Prolonged labor outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

How to study Prolonged labor in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Prolonged labor means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Prolonged labor out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Prolonged labor in simple terms?

Prolonged labor is the inability of a woman to proceed with childbirth upon going into labor. Prolonged labor typically lasts over 20 hours for first time mothers, and over 14 hours for women that have already had children.

Why does Prolonged labor matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Prolonged labor?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Prolonged labor.