Lumboperitoneal Shunt Placement

Lumboperitoneal Shunt Placement

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Placement of a lumboperitoneal shunt is an effective method to divert spinal fluid. Two general of lumboperitoneal shunts are in use today: valve-mediated and valveless . The placement techniques described below are common to both.

Lumboperitoneal s is a method of diverting cerebrospinal fluid (CSF) from the subarachnoid space to the abdominal cavity. Advantages of lumboperitoneal s include avoidance of brain penetration with the shunt catheter, access to a large CSF space in the thecal sac, and the potential (for good or ill) of a large amount of CSF drainage.

Patients who require a lumboperitoneal shunt have pathology that predisposes to obstruction of CSF absorption or elevated CSF pressure but must have communication of the spinal CSF with the cranial compartment. Specific indications include, but are not to, communicating hydrocephalus, normal pressure hydrocephalus, and idiopathic intracranial hypertension (pseudotumor cerebri). [1, 2, 3, 4, 5]

Lumboperitoneal shunts can also be placed for management of localized pathology that affects the spinal cord. They have been used to drain and prevent reformation of pseudomeningoceles, or unwanted collections of CSF. Lumboperitoneal shunts have also been used to help minimize CSF leaks, either natural or iatrogenic. The principle is to decrease the fluid pressure on the dural defect and thus prevent excessive CSF leakage. Its use in the trment of spinal syringomyelia has also been reported. [6]

A lumboperitoneal shunt should not be placed in patients with localized elevated pressure and mass effect in the cranial cavity (eg, intracranial tumor or subdural hematoma). Excessive s of CSF in the spine may cre a pressure gradient across the craniospinal junction, promoting downward brain herniation. A Chiari malformation is a relative contraindication to lumbar s for this reason. In addition, the spinal CSF space must freely communicate with the cranial CSF space.

Lumboperitoneal shunt complications can be divided into those involving the lumbar catheter, those involving the peritoneal catheter, and general complications. Valve complications can also exist if a catheter system with a valve is installed.

Lumbar catheter complications include overdrainage of CSF, catheter obstruction, catheter migration, catheter misplacement, and spinal nerve irritation. [1, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24] Overdrainage of CSF is a commonly cited complication; generally involve postural headaches, nausea, and vomiting. More severe manifestations of overdrainage, acquired Arnold Chiari displacements and subdural hematomas, have been reported. To reduce the incidence of overdrainage, some surgeons advocate the use of valved-shunt systems. Valved systems allow a fixed volume of CSF to be drained into the peritoneal cavity, or drainage against a fixed pressure (see below).

As the lumboperitoneal catheter is placed in close proximity to the spinal nerves, spinal nerve injury or radiculopathy can occur. In general, the needle should not be placed above the L3 level to avoid potentially injuring the spinal cord. As the patient is in the lateral decubitus position, the Tuohy needle should be inserted with the sharp up-curving end of the needle in parallel to the patient’s longitudinal axis. Once placement of the needle is confirmed, the Tuohy needle should be rotated 90º to allow the catheter to be fed in a rostral or caudal . Multiple attempts at spinal puncture can lead to a postoperative CSF leak. Fluoroscopy can be used intraoperatively to aid in placement.

Catheter migration within the spinal and peritoneal compartment is common. Preventive steps involve using sutures and anchors (usually provided with the shunt system) to secure the spinal catheter in place to the lumbar fascia after proper intraoperative placement. Nonetheless, reports of migration have been reported despite securing the catheter. [17, 18, 23, 24, 25]

Shunt infections [1, 7, 9, 25] are not as common in adult patients as are shunt displacements. Steps to prevent infection include proper preoperative surgical site disinfection, careful draping (consider glove change after draping), and minimizing operating time. Systemic antibiotics should also be given within one hour prior to skin incision. The catheter system can be stored in an antibiotic solution prior to insertion but generally is not opened until ready for use.

Blockage of the shunt system, resulting in failure of the system, can occur. The reported incidence of shunt revision due to obstruction ranges from 14%-62%. The incidence of shunt infection and resulting meningitis ranges from 1%-10% of all lumboperitoneal shunts. Shunt infection can also result in shunt obstruction. [1, 8, 9, 26]

Migration of the shunt catheters is also a common experience. The lumbar catheter can migrate relative to the thecal sac (usually into the subcutaneous space), and the peritoneal catheter can likewise come out of the peritoneum. The incidence ranges from 3%-. Migration complications have been noted to be more common in the pediatric population. [8, 26, 27] When a catheter migrates out of the thecal sac, a subcutaneous collection of spinal fluid can be observed.

ly onset radicular pain has been noted to occur with lumboperitoneal shunts. This may result from catheter migration or localized inflammation leading to arachnoiditis. The onset of may necessitate shunt revision. The incidence of developing ly onset radicular pain ranges from 5%-6%. [1, 26]

Overdrainage of CSF can result in intracranial hypotension and positional headaches. Incidence has been noted to be from 5%-10%. [25, 27] Valves have been designed to trigger at different pressures in the recumbent and standing position (see below), and programmable valves are also available. In one case report, authors report overdrainage secondary to an iatrogenic dural defect when placing the lumbar section of the shunt. [16] On the other hand, underdrainage without relief of preoperative is also possible. Incidence can range from 9%-12%. [8]

Intracerebral hemorrhages and secondary Arnold Chiari-type tonsillar herniation have been reported. The incidence of postprocedure subdural hematomas ranges from 2%-4%. [1, 9] Isolated case reports of intraparenchymal hemorrhages, as well as abdominal hemorrhages that occur after shunt placement, have also been reported. [21, 22] The incidence of Arnold-Chiari 1 displacements have been reported to occur in up to 70% of patients. However, only a smaller subset of patients, 1%-14%, have been described to develop . [2] Interestingly, associated scoliosis has also been reported. [14]

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Nadkarni TD, Rekate HL, Wallace D. Concurrent use of a lumboperitoneal shunt with programmable valve and ventricular access device in the trment of pseudotumor cerebri: review of 40 cases. J Neurosurg Pediatr. 2008 Jul. 2(1):19-24. [Medline].

Chih-Ta Lin, MD Resident Physician, Division of Neurosurgery, Fletcher Allen Health Care, University of Vermont College of Medicine

Chih-Ta Lin, MD is a member of the following medical societies: American Association for Cancer Research, American Association of Neurological Surgeons, American College of Surgeons, Society for Neuro-Oncology, Congress of Neurological Surgeons

Disclosure: Nothing to disclose.

Paul L Penar, MD, FACS Professor, Department of Surgery, Division of Neurosurgery, Director, Functional Neurosurgery and Radiosurgery Programs, University of Vermont College of Medicine

Paul L Penar, MD, FACS is a member of the following medical societies: Alpha Omega Alpha, American Association of Neurological Surgeons, World Society for Stereotactic and Functional Neurosurgery, Congress of Neurological Surgeons

Disclosure: Nothing to disclose.

Mary L Windle, PharmD Adjunct Associate Professor, University of Nebraska Medical Center College of Pharmacy; Editor-in-Chief, Medscape Reference

Disclosure: Nothing to disclose.

Remi Nader, MD, CM, FRCS(C), FACS, FAANS President, Texas Center for Neurosciences PLLC; Clinical Associate Professor of Neurosurgery, University of Texas Medical Branch at Galveston; Clinical Assistant Professor of Neurosurgery, Department of Neurosurgery, Tulane University School of Medicine

Remi Nader, MD, CM, FRCS(C), FACS, FAANS is a member of the following medical societies: American Association of Neurological Surgeons, American College of Surgeons, Royal College of Physicians and Surgeons of Canada

Disclosure: Received consulting fee from Alliance Partners for consulting; Received consulting fee from Medyssey Spine for consulting.

Lumboperitoneal Shunt Placement



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