improving the out come of diaphragmatic hernia
TRANSCRIPT
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RE OPERATIVE IN DIAPHRAGMATIC HERNIA
Dr/Medhat M. IbrahimConsultant of pedia-surgery
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“Good judgment comes from experience, and
often experience comes from poor judgment.”
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OVERVIEW The complexity of patients born with
CDH creates a challenge to every surgeon
who must bring these infants to the operating
theater for the initial repair. In this instance, the operation is
relatively straight forward, but the physiology is treacherous.
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Cont, Conversely, when situations arise
requiring a subsequent procedure, the physiology is often, but not always, more settled, but the procedure is usually much more difficult.
With increased survival has come increased morbidity and, not surprisingly, subsequent operations have become fairly common.
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Cont, In one report, 42% of CDH survivors required
at least one additional operation. The need for reoperation is often predictable, as are the common indications.
First and foremost is a recurrence of the hernia.
Second feeding problem(gastro esophageal reflux (GER),
Then variable other causes as un descended testes, inguinal hernia, other.
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Incidence of Reherniation
Re herniation after a CDH repair has varied from 2–22%.
But has been reported to be as high as 80% in a select group:
large defect, absent posterior portion of the diaphragm, Sever lung hypo- plasia that require ECMO ,long
mechanical ventilation. Patch graft repair, Neuorogenic defect associated with CDH as
phrenic nerve affection.
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CONT, Also the method of initial reconstruction. Most important is the length of follow-up: Van Meurs et al., 40% of CDH survivors with a
patch repair eventually had a recurrence. Moss et al; reported that within 3 years of
initial repair, nearly 50% of patients who underwent a patch repair had developed a re-herniation.
Moss also noted that the majority of re-herniations were owing to the patch pulling away from the posterior thoracic wall
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Presentation The majority present within the first 24
months of life. Moss and colleagues found a bimodal peak
incidence of recurrence. The first being between 1 and 3 months of age
and the second between 10 and 36 months. Saltzman et al. reported that the age at time
of recurrence ranged from 2 to 48 months, with the average being approximately 14 months
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CONT, In fact, reherniation is often only
discovered on routine chest radiographs. For this recommend regular surveillance
chest radiographs is important as: Monthly for the first 6 months. 3months until the age of 24 months. Then at 30 and 36 months. Every 2–3 years until age 10.
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Cont, in may experience the incidence of
recurrence drops precipitously after 6 months, so I do not obtain annual chest x-rays (CXR) for surveillance purposes alone unless there is clinical need after that time.
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symptoms related to a reherniation Generally fall into two categories:1. pulmonary symptoms.2. gastrointestinal symptoms.
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pulmonary symptomsI. Pulmonary symptoms are rare beyond
the neonatal period.II. Tachypnea, III. Persistent cough,IV. Development of aspiration pneumonia,
and/or recurrentV. Wheezing requiring increased use of
bronchodilators
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Cont, Respiratory distress in an older child is
an ominous sign as tachypnea is usually a physiologic response to metabolic acidosis rather than pulmonary compromise.
Development of any of these symptoms should trigger a search for an occult reoccurrence.
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The gastrointestinal symptoms Progressive oral aversion. New or increased feeding intolerance. Increased vomiting or worsening GER. Abdominal distension, or abdominal
pain. Although these symptoms are not
unique to reherniation,so I have differentiate between rehernation, adhesive intestinal obstruction, GER.
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Diagnostic Tools The diagnosis of recurrent CDH should be
suspected based on history and physical exam, and can often be confirmed with a single chest radiograph.
Adjunctive radiological studies will be necessary to help better understand the anatomy as regards the location of reherniation and the amount of abdominal contents involved.
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The studies of value upper gastrointestinal (UGI) with small
bowel follow through. contrast enema. With the advent of faster CT scans which
have eliminated the need for sedation, CT has become our preferred diagnostic tool.
In cases where reherniation is suspected on clinical grounds, but the chest film is equivocal
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Upper gastrointestinal (UGI) with small bowel follow through.
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Recurrent left CDH with bowel in chest. Note the pH probe.
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Coronal CT reconstruction right CDH recurrence
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The Surgical Approach patients can be divided into
symptomatic and asymptomatic groups. Symptomatic-------- urgent repair. Asymptomatic------- treated expectantly
for several months, or in some cases years, as long as they are carefully monitored.
I believe that all recurrences will eventually necessitate repair.
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The justification for delaying repair in asymptomatic patients includes allowing time for improvement in:
Pulmonary nutritional parameters Tissue to be viable and tolerate repair Avoid bleeding and subsequent non required morbid
procedures. From a practical standpoint, repairing or
replacing a patch simply resets the clock until the next recurrence. So allowing the asymptomatic child to grow might allow for a more secure repair later and fewer repairs in total.
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The choice of approach Theoretically, the repair can be performed
either via open or minimally invasive technique, but as a practical matter, the latter is probably only appropriate for the most minimal of defects.
The choice of approach may be influenced by other circumstances such as:
Fundoplication Gastrostomy tube will also be performed at the
time of the repair, An incisional hernia is present
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The trans thoracic approach Favored by some It is more likely to provide a virgin operative
field in patients who initially underwent a trans abdominal repair.
Well not be reasonable in : child has evidence of pulmonary hypertension inadequate lung reserve Practically you cant repair the postero medial herniation
through it, also the retro peritoneal weakness cant be managed through.
If the patient need for other procedure as gastrostomy ,fundoplication, adhesolysis,
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Trans abdominal approach which is often a bit more challenging and
time consuming. Allows us better visualization of the defect
itself, and the organs and structures that must be preserved.
It also provides ready access to perform a fundoplication and/or gastrostomy tube should one be needed.
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The thoraco-scope It can be diagnostic Repair small postero lateral defect. Large rehernation is associated with
adhesion exposing the procedure to failure or end with morbidity.
So theoretically it is helpful ,practically it is too risk.
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Repair Techniques plan the most appropriate repair technique. the mode of failure of the initial repair must be
ascertained. The location of failure is important, as it will dictate
subtle but important differences in timing and technique.
there are four primary modes of failure: failure of a primary repair failure of the medial aspect of the repair recurrence at the posterior-lateral margin
Development of a paraesophageal hernia which is not recurrence in all most the literature.
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Anterior and lateral failures are rare probably because the anterior lip of
diaphragm seems to be the thickest muscle.
The liver act as a support foe the repair. The heart also from above. There is no real negative force at this
site as the maximum force loud come at the center of the diaphragm and posterolateral.
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the cause of recurrence In the case of a failed primary repair, the cause of
recurrence is often a high-tension initial repair in which the sutures simply could not hold the tissue together.
In these cases, another primary repair is usually impossible and a new prosthetic patch should be placed.
A novel dome technique was described by Loff and coworkers in 2005.
A variety of novel approaches to repairing a recurrent hernia both with prosthetic patches and with muscle flaps have been described.
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Holy Grail The “Holy Grail” of CDH repair is a patch that can
grow and remodel with the child. Recent large animal data suggest that CDH repair with autologous, engineered tendon patches is possible.
These grafts can be made available at birth, as they can be engineered in parallel to gestation, from cells normally present in, and harvested from, the amniotic fluid.
A proposed protocol for the first clinical trial of this novel therapeutic concept is currently under review by the Food and Drug Administration (FDA)
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What we do? However, until pre-engineered bio
prosthetic patches become a clinical reality, we will
continue to rely on the synthetic devices currently available.