Most mums-to-be will have wondered whether they should opt for an epidural at one time or another. And yet, considering that at least 60 per cent of women today have an epidural for pain relief during labour, it’s surprising how misunderstood this procedure is. For starters, even doctors use the word “epidural” generically, to encompass three similar, yet distinct procedures: epidurals, spinals and a more recently perfected procedure, the combined spinal epidural (CSE), or “walking” epidural. Since deciding whether or not to have an epidural means becoming informed about the benefits and risks well before labour begins, here are the facts to help you make sense of some misconceptions:

MYTH An epidural and a spinal are the same.

REALITY An epidural involves injecting pain-blocking medication into a space between the vertebrae and the spinal fluid; it usually takes about 15 minutes to work and lasts as long as needed. A spinal is an injection directly into the spinal fluid; it is given as part of the CSE technique and takes effect in five minutes. With either an epidural or CSE, the catheter that delivers the drug is left in the epidural space until the baby is born so the medication can be administered continuously

But the type of medication that is given, the dosage and for how long all vary depending on the individual and the hospital; some routinely combine epidurals with spinals and some do not. Different techniques, medications and doses have different results and risks, so being educated about the procedures used where you will deliver can help you make a decision that is right for you.

MYTH The needle used is gigantic, and it hurts when inserted.

REALITY The epidural needle is left in place for only a minute or two – just long enough to insert a skinny, flexible catheter the size of a pencil lead into the epidural space. The spinal needle is much smaller – the width of a thick piece of hair. But before this happens, the injection site is numbed with a local anesthetic, at which point you will feel a pinch and sting for about 10 seconds. You’ll feel pressure, but not pain, when the epidural and/or spinal itself is given.

MYTH An epidural makes pushing difficult.

REALITY One advantage of combining spinals with epidurals is that it typically allows for less medication to be given than with an epidural, so you get pain relief without total numbness. This lower dose makes pushing easier than with a higher-dose epidural, reducing the likelihood of a forceps or vacuum-assisted delivery.

MYTH A woman can move around throughout labor if she has a “walking” epidural.

REALITY Most women do not walk with one. Once one is given, continuous fetal monitoring and an IV are needed, and many doctors do not encourage women to walk with these.

MYTH None of the medication used reaches the baby.

REALITY Any medication that you take to relieve pain will reach the baby, however, with an epidural, the amount that enters your bloodstream is quite small, and with a spinal, it’s even smaller. While further studies are needed, the small amount of medication absorbed by the baby is not known to cause any serious harm.

MYTH Epidurals pose a high risk of serious side effects.

REALITY Epidurals are very safe for the vast majority of patients. Complications do occur, though, and can range from the short-term and bothersome to the (far more rare) long-lasting or life-threatening. The most common side effect is hypotension, a drop in maternal blood pressure that could affect the baby; this occurs more with higher doses of medication. With early identification and treatment, hypotension has no consequences to mother or baby. Other relatively common and treatable side effects are nausea, which affects roughly 20 to 30 per cent of women who receive epidurals; and itching, which affects approximately 30 to 50 per cent.

Another possibility is that the mother will develop a fever if an epidural is in place for about six hours or more; this can lead to diagnostic testing and, sometimes, antibiotics for mother and child. With first births, about 20 per cent of mothers have an elevated temperature, because the first birth is usually the longest.

A much rarer complication is a severe “spinal headache.” This occurs in less than 1 per cent of patients in most hospitals, but it can last for several days and be very uncomfortable. Other rare risks include infection, bleeding and nerve damage near where the injection is given. If the drug is accidentally injected into the bloodstream, this can cause breathing to slow or stop, seizures or even death. However most anesthesiologists will go through a whole career and never see a case of these rare complications.

MYTH Epidurals often don’t work.

REALITY According to data, less than 5 per cent of women have unrelieved labor pain after receiving an epidural. This can be caused by the baby’s position, but sometimes the anesthesiologist simply needs to give more medication. Occasionally, the pain is relieved on only one side of the body, either because the catheter is mispositioned or dislodged or because the mother stays in the same position for too long; this problem is easily remedied. An increasingly popular option is patient-controlled epidural analgesia (PCEA); the laboring woman can control the amount of pain relief she gets, but overdosing is extremely unlikely.