Ostomies

The word stoma is Greek for mouth. An ostomy is an operation that brings a segment of intestine through the abdominal wall and sews it to the skin, so that stool exits there instead of through the rectum.

I want to say at the outset that this is the part of general surgery patients fear most and, in my experience, the part they most often end up telling me was not as bad as they had imagined. That does not make it trivial. It is a genuine change to your body and your daily routine. But the fear is usually larger than the reality.

Why would I need one?

Three general reasons.

To protect something downstream. If a new connection between two ends of bowel is at high risk of leaking, diverting stool away from it while it heals reduces the consequences if it does. This is the most common reason for a temporary stoma, particularly after low rectal surgery.

Because the bowel could not safely be reconnected. In a contaminated abdomen, in a patient who is unstable, or when the tissue quality is poor, joining two ends together is a bet with a very bad downside. Bringing one end out to the skin is the safe play.

Because the segment downstream is gone or nonfunctional. After removal of the rectum and anal sphincters for low rectal cancer, for example, there is nothing left to reconnect to.

Ileostomy versus colostomy

An ileostomy uses the small intestine, and it sits in the right lower abdomen. Because the colon is being bypassed and the colon is what absorbs water, ileostomy output is liquid to porridge-like and high volume, typically 800 to 1200 mL a day once it settles.

A colostomy uses the large intestine, most often in the left lower abdomen. Because some or most of the colon is still in the path, the output is more formed and lower volume.

That difference in output has one practical consequence that matters more than any other: dehydration is the single most common reason patients with a new ileostomy end up back in the hospital. You are losing a liter of fluid and a significant salt load daily through a route your body is not used to. Kidney injury from this is common and entirely preventable. If you go home with a new ileostomy, you need to know your daily output number, you need to be drinking oral rehydration solutions rather than plain water, and you need a threshold at which you call. This is not optional advice.

End versus loop

This is worth understanding because it determines how easy the stoma is to reverse.

An end stoma is exactly what it sounds like. The bowel is divided, and one end is brought out. The other end either gets stapled closed and left inside the abdomen, or is brought out separately as a small non-functional opening called a mucous fistula. Reversing an end stoma means reopening the abdomen and finding that other end, which is a major operation.

A loop stoma brings out a loop of intestine without dividing it completely, and an opening is made in the front of the loop. Both the upstream and downstream limbs of the loop are therefore right at the skin. This makes reversal much simpler: often a small incision around the stoma itself, close the opening, put it back, without a formal laparotomy.

The general rule is that a stoma intended to be permanent tends to be an end stoma, and one intended to be temporary tends to be a loop.

Is it temporary or permanent?

Ask your surgeon this specific question, and ask it again after the operation, because sometimes the plan changes based on what was found.

If it is temporary, reversal usually happens somewhere around eight to twelve weeks out, once inflammation has settled and you have recovered from the first operation. Before reversal we generally image the downstream segment with contrast to confirm that the connection it needs to empty into is intact and open.

A meaningful number of stomas intended to be temporary are never reversed. Sometimes that is because the patient’s health changed, sometimes because a complication made it unwise, and sometimes because the patient decided they were doing well and did not want another operation. That last one surprises people, and it happens more often than you would think.

Living with a stoma

The appliance is a pouch that adheres to the skin around the stoma with a barrier wafer. Most people change it every three to five days. Learning to do this well takes a few weeks and a good enterostomal therapy nurse, who is genuinely the most valuable person in this entire process and worth more than anything I can write here.

A few practical realities. The stoma itself has no nerve endings and no sensation, and it will always look bright red and moist, which is normal. It has no sphincter, so there is no control over when output happens, which is why the pouch exists. Skin irritation from output getting under the wafer is the most common day-to-day problem and is almost always a fit problem, not a hygiene problem. Gas and odor are manageable and, for most people, less conspicuous than they fear.

You can swim, exercise, travel, and eat most things. Very high fiber foods and things that do not break down well, such as popcorn, nuts, mushrooms and celery, can occasionally block an ileostomy and are worth chewing carefully or moderating early on.

What complications happen?

The most common by far is a parastomal hernia, a hernia around the stoma. Depending on the definition used, this occurs in something approaching half of permanent colostomies over time. Many cause no symptoms and need nothing. Repair is done for pain, obstruction, or an inability to keep an appliance sealed, and recurrence after repair is unfortunately common.

Others include retraction, where the stoma pulls below skin level and makes the seal difficult; prolapse, where an alarming length of bowel telescopes out, which looks far worse than it usually is; stenosis, where the opening narrows; and high output, which returns us to the dehydration problem above.