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24 Hirschsprung’s Disease
Fig. 24.26 Patulous anus
Fig. 24.27 Abdominal fi lm showing retention of stool
post-Hirschsprung’s operation
to the opposite (narrow, non-dilated) tendency to diarrhea, hypermotility type (Fig. 24.28 ). As we explained in the chapter about bowel manage­ment, those groups require a completely different regimen of bowel management in order to be suc­cessful incontinence [ 131 , 132 ].
Fig. 24.28 Contrast enema – spastic, hyperactive colon
If the patient has an intact anal canal, we believe that the patient has potential for bowel control. Some patients (49/103) even with intact anal canals suffer from fecal incontinence, and we do not know exactly why. However, the con­trast enema in those cases will tell us whether the patient suffers from severe constipation and megacolon (hypomotility) or non-dilated colon and tendency to diarrhea (hypermotility). The management of each group is different. We give all these patients the opportunity to see how much bowel control they have, helping them to improve their specifi c motility problem. In other words, if the patient has constipation and mega­colon, we give them laxatives. If the patient has tendency to diarrhea and a non-dilated colon, then we administer a constipating diet, pectin, and Imodium.
3
In both groups, we radiologically monitor the effects of our treatment. The patients are managed on an ambulatory basis over a period of 1 week (see Chap. 20 ). They are expected to
3
Imodium – active ingredients: loperamide HCl 2 mg and simethicone 125 mg (in each caplet); slows the rate at which the stomach and intestines move. It also increases the density of stools and reduces the amount of fl uid in the stool.
24.13 Problems, Complication, and Sequela Secondary to Operations for Hirschsprung’s Disease
Table 24.1 Medical management in patients with fecal incontinence after Hirschsprung’s operation
Patients with constipation Patients with tendency to diarrhea Clean with
enemas
33.8 % 5.8 % 8.8 % 8.8 % 33.8 % 8.8 %
Remain incontinent in spite of the use of laxatives
Continent with the use of laxatives
Continent with the use of constipating diet and bulking agents
Clean with the use of enemas and constipating diet
Remain incontinent in spite of enemas and constipating diet
429
Fig. 24.29 Contrast enema in a patient with retained
aganglionic segment
come to the clinic every day. Abdominal x-ray fi lms are taken daily to monitor the amount of stool in the colon, and with that information, we determine if the amount of laxative that we are giving is adequate. By doing that, many patients who suffer from constipation and “incontinence” now behave like continent patients which means that perhaps they were actually suffering from overfl ow pseudoincontinence.
In cases of patients with a non-dilated colon with tendency to diarrhea, a decreased borderline sensation and perhaps a partially damaged sphincter cannot cope with a hyperactive bowel that has constant peristalsis trying to pass stool. Therefore, the use of specifi c fi ber (pectin) that makes the stool more bulky plus a constipating diet and Imodium* and regular meals trying to
decrease the number of bowel movements may make the patients behave like fecally continent. Table 24.1 shows our results with the manage- ment of patients with fecal incontinence after Hirschsprung’s operations. The contrast enema, in addition, occasionally may show changes consistent with retention of an aganglionic piece of colon (Fig. 24.29 ); in such cases, during the examination under anesthesia, a rectal biopsy is done. If the results of the biopsy confi rm the absence of ganglion cells, a secondary resection and pull-through is performed.

24.13.2 Non-preventable Complications

We think that enterocolitis is a non-preventable and non-predictable complication. For us, this complication represents a mystery. Fortunately, we know some of the predisposing factors that contribute to generate this problem of enterocoli­tis, but we still do not know its intrinsic pathophysiology.
There is something characteristic about Hirschsprung’s disease patients; in general, they do not tolerate fecal stasis. A normal human being who retains stool develops a clinical pic­ture consistent with what we call constipation, but they generally do not develop toxemia and proliferation of bad bacteria. In Hirschsprung’s disease, the patients usually behave differently, as previously mentioned. They tend to suffer from enterocolitis. So far, our management of this problem that has been described here includes only the use of frequent irrigations and metroni­dazole. If that is not enough, we offer the patients subsequent resections of bowel, even knowing that the resection will include normoganglionic bowel. It is expected that those resections may
430
24 Hirschsprung’s Disease
decrease the chances of the patient to suffer from enterocolitis. Again, the contrast enema may show changes consistent with the possibility that the patient still has a piece of aganglionic segment.

24.13.3 Partially Preventable Complications

In this category, we include the problem of con­stipation. We believe that if we leave an extremely dilated piece of bowel, even when it is normogan­glionic, most likely the patients will suffer from postoperative constipation. The old, demon­strated principle that a hollow viscus (ureter, colon, small bowel, and esophagus) that is allowed to suffer from severe viscus dilatation will lose its normal peristalsis is applicable here. A colon that is extremely dilated, by defi nition, will suffer from hypomotility, and therefore, it is expected that the patient will have severe consti­pation. Therefore, we emphasize the need to resect not only the aganglionic segment but also the dilated normoganglionic portion of the colon.

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112. Vorm HN, Jensen SI, Qvist N (2002) Lateral sphinc­teromyotomy in patients with outlet obstruction after surgery for Hirschsprung’s disease and short­segment disease. Pediatr Surg Int 18(5–6):368–370
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116. Martin LW, Altemeier WA (1962) Clinical experi­ence with a new operation (modifi ed Duhamel
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Idiopathic Constipation and Other Motility Disorders

2 5
25.1 Defi nition and Terminology
The term idiopathic constipation refers to the incapacity or diffi culty to pass stool regularly and effi ciently. In addition, we believe that it also means incapacity to empty the colon.
We use the term “idiopathic” because we do not know the etiology of this condition. We are aware of many proposed explanations to under­stand the pathophysiology of this condition, but we fi rmly believe that none of those explanations have solid scientifi c basis. In agreement with Benjamin Disraeli, we believe that “to be con­scious that you are ignorant is a great step to knowledge” [ 1 ].
We intentionally avoided other terms fre­quently used in the literature, basically because many of those names implied an accepted etiol­ogy. Some of those names include: “puborectalis spasm syndrome,” “descending perineum syn­drome,” “chronic obstipation,” and “spastic pel­vic fl oor syndrome.” In addition and most importantly the treatments that we have to offer to patients with constipation are not different, regardless of the category or type of constipation that the patient suffers from.
We also refer to idiopathic constipation as the central subject of this chapter because, by far, the greatest number of patients coming to our clinic
Electronic supplementary material Supplementary material is available in the online version of this chapter at
10.1007/978-3-319-14989-9_25 .
with a colonic motility disorder, requesting a sur­gical consultation, belongs to this particular group.

25.2 Incidence, Social Impact, and Relevance

Idiopathic constipation is by far the most com­mon defecation disorder and colonic motility disorder seen in children. It represents a common cause for surgical consultation [ 24 ]. It affects millions of Americans, as well as patients of other countries, but perhaps most important is the fact that it is an incapacitating condition when it is not treated properly. In fact, it pro­duces a form of fecal incontinence known as encopresis or overfl ow pseudoincontinence that makes the patient socially rejected and discriminated.

25.3 Etiology

We are aware of multiple publications proposing different possible causes for this condition. However, most of those explanations have no sci­entifi c basis, and therefore we do not embrace them. We prefer to take a healthy and potentially more productive attitude by declaring our igno­rance about the origin of this condition.
Some authors believe that diet is very impor-
tant as an etiologic factor of constipation [ 5 , 6 ].
A. Peña, A. Bischoff, Surgical Treatment of Colorectal Problems in Children, DOI 10.1007/978-3-319-14989-9_25, © Springer International Publishing Switzerland 2015
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25 Idiopathic Constipation and Other Motility Disorders
There is no question that different types of food have either a laxative or a constipating effect on our bodies. In addition, we recognize the exis­tence of personal idiosyncrasies that explain why one type of food may act as a laxative for one individual and have a constipating effect for another one. Although we recognize that diet is important to regulate colonic motility, we believe that the therapeutic value of diet is negligible in the most serious forms of constipation. We must keep in mind that this chapter belongs to a book of surgical treatments of colorectal problems in children. The type of constipation that is manage­able by diet belongs to the pediatric clinics. Those patients do not come to our clinic because they are treated either by a pediatrician or gastro­enterologist. The patients that come for surgical consultation are patients that have already received all kinds of unsuccessful medical man­agements previously.
There are also many articles [ 712 ] that try to explain the problem of idiopathic constipation on psychological basis. The psychodynamic mecha­nisms proposed are interesting and sometimes picturesque; including, strict demanding parents. Strict demanding parents who impose rigid rules on a child during the toilet training process, chil­dren that supposedly retain the stool to manipu­late the parents to achieve their own purposes. All these mechanisms may have an element of truth, but we do not believe that they can explain the severe forms of constipation in patients with fecal pseudoincontinence, giant megacolon, some­times megabladder, serious nutritional and devel­opmental disturbances, and sometimes death. We think that it is certainly not easy to retain stool voluntarily in an otherwise autonomous normal rectosigmoid with normal peristalsis.
It is true that most patients suffering from idiopathic constipation also have a psychological disorder, but we do not think it is a primary one. Any human being suffering from severe consti­pation and soiling, ostracized and discriminated understandably, must have a very signifi cant sec­ondary psychological problem.
Surgeons, on the other hand, have proposed different potential mechanisms to explain this problem. For instance, a rather simplistic expla-
nation is that there is a lack of relaxation of the “internal sphincter” also known as achalasia of the internal sphincter [ 1316 ]. This is, obviously, a very attractive and popular idea. In other words, a simplistic logic dictates that incontinence means “lack of sphincter”; therefore, constipa­tion most likely means “too much sphincter.” However, as discussed in the chapter of ultrashort Hirschsprung’s, we do not believe that the “acha­lasia of the internal sphincter” is an entity that can explain the symptoms of these patients.
Many patients suffering from idiopathic con­stipation are subjected to rectal manometry. Many of them have no relaxation refl ex. The lack of relaxation has been described as a diagnostic of Hirschsprung’s disease, and therefore the next step is usually to take a rectal biopsy. If the rec­tum has no ganglion cells, the diagnosis of Hirschsprung’s disease is confi rmed. On the other hand, if the rectal biopsy shows ganglion cells, the patient then receives the diagnosis of “achalasia of the internal sphincter.”
25.3.1 Ultrashort Segment
Hirschsprung’s Disease
Ultrashort Hirschsprung’s disease has been defi ned as a condition in which a small length of the distal bowel has no ganglion cells. The spe­cifi c length of this aganglionic zone has not been defi ned. Under normal circumstances, human beings have an area of aganglionosis above the pectinate line [ aganglionic zone has not been well established at different ages from premature life to the adult size. Consequently, it is very diffi cult to know if a biopsy that shows absent ganglion cells was taken from this normal aganglionic area of the rectum. At what point an aganglionic zone is con­sidered normal and at what point is considered typical Hirschsprung’s? Both are unanswered questions.
Many authors believe that this is a common cause of constipation [ 3942 ]. We believe that “ultrashort segment Hirschsprung’s disease” and the so-called internal sphincter achalasia are highly debatable conditions. From the clinical
4345 ]. The length of this normal
25.3 Etiology
437
and radiologic point of view, patients who have been labeled with these conditions cannot be dif­ferentiated from those suffering from idiopathic constipation clinically or from the radiologic point of view. In other words, the three groups of patients suffer from severe constipation, they have a tendency to soil the underwear when the constipation is severe, they have a very dilated rectum, and most importantly, the three groups respond to the use of laxatives. Those authors who support the existence of these two condi­tions (ultrashort segment Hirschsprung’s and internal sphincter acatalasia) [ 1316 , 3340 ] claim that they can make the diagnosis based on manometric studies [ 1721 ] and confi rmed by sophisticated histochemical techniques not always available to the clinician.
We have serious questions about the existence
of these conditions for several reasons:

25.3.2 Rectal Manometry

During a regular rectal manometry study, a bal­loon is placed inside the lumen of the rectum, and the pressure of the anal canal is recorded. Under normal circumstances, the infl ation of the balloon in the rectum elicits a response from the patient consisting in a drop of pressure in the anal canal, which the manometrists interpret as “relaxation of the internal sphincter.” The fi rst question that comes to our mind is how do they know that the internal sphincter is the structure that is relaxing? If we think about the real anatomy of normal individuals (see Chap. called internal sphincter has been defi ned as a thickening of the circular layer of smooth muscle of the most distal portion of the bowel. However, surrounding the entire rectum, there is an obvious and powerful striated skeletal muscle structure or voluntary sphincter mechanism. During very early manometric studies, some investigators used paralyzing agents in animals and even in human volunteers in order to be able to discrimi­nate the relaxation of the striated muscle, from relaxation of the smooth muscle (internal sphinc­ter), and they concluded that it was the smooth muscle that was relaxing. In addition, they even
2 ), we fi nd that the so-
reached the conclusion that 85 % of the bowel control depended on the “internal anal sphinc­ter!” Yet, during all the clinical manometric eval­uations of patients, muscle relaxants are not used, and therefore, we do not know if the drop of pres­sure in the anal canal is due to a relaxation of the striated muscle complex or to the smooth muscle.
Another very serious question that comes to our mind when discussing rectal manometry is the fact that most patients evaluated manometri­cally suffer from constipation, and, by defi nition, most of them have a very dilated rectum. In order for the patient to have a relaxation refl ex, it is necessary to stretch the rectal wall with the infl ated balloon. That means that we are sup­posed to use different volume balloons for differ­ent patients depending on the size of the rectum. We are unaware of this kind of methodology. Most manometries use the same size balloon for all patients, and certainly we have never seen 1 or 2 L balloons, yet we have seen many patients with giant rectums. As a consequence, it is con­ceivable that the infl ation of a relatively small balloon that does not stretch the rectum would produce a negative refl ex. In other words, the pressure in the anal canal would not drop because actually the rectum was never distended due to the fact that they used a standard size balloon in a megarectum. When we asked these questions to different proponents of manometry, we do not have a reasonable answer.
25.3.3 Doubts and Questions About
the Anatomy of the Internal Sphincter
The “internal sphincter” has been defi ned as a thickening of the circular layer of the smooth muscle of the bowel in its most distal portion, the anorectum. Yet, real photographs documenting the presence of this structure are extremely unusual to see (see Chap. 2 ). A description of the specifi c thickness and upper and lower limits of this elusive structure at different ages is inexis­tent. There are plenty of diagrams but very few photographs, and those photographs do not show