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Chapter29:Palliative care and symptom management
Table 29.15 Commonly used antidepressants
Class Common dosing Comments
Tricyclic (and related) Cardiac conduction delays and anticholinergic
Amitriptyline 25–150 mg at night
10 mg is starting dose in elderly
Nortryptiline 25–150 mg at night
10 mg is starting dose in elderly
Desipramine 25–200 mg a day. May divide bid. 10 mg is
starting dose in elderly
Selective serotonin reuptake inhibitors
Paroxetine 20–50 mg daily
10 mg is starting dose in elderly
Fluoxetine 20–60 mg each morning Activating. Long half-life
Sertraline 25–200 mg daily
Citalopram 20–60 mg daily
Escitalopram 10–20 mg daily
Start with 5 mg in elderly
Selective serotonin and norepinephrine reuptake inhibitors
Buproprion 100 mg bid to150 mg tid Available in sustained-release form
Venlafaxine 37.5–75 mg bid to tid Available in sustained-release form
Mirtazapine 15–45 mg qhs Associated with sedation and weight gain
Duloxetine 20–60 mg daily or bid Effective for neuropathic pain
Psychostimulants
Methylphenidate Start 2.5–5 mg in morning and at noon Available in sustained-release form. Unclear what
Dextroamphetamine Start 2.5–5 mg in morning
side effects often limit their use. Sedating. Some efficacy for neuropathic pain. Start with low doses and increase slowly, particularly in elderly
May have particular benefit in anxiety disorders
May have particular benefit in anxiety disorders and neuropathic pain
the maximum effective dose is in depression
in patients with concomitant neuropathic or chronic pain. Mirtazapine can cause weight gain, improve nausea, promote sleep, and has relatively fewer drug interactions than other antidepressants; thereby it may be of particular use in cancer patients.
160
Psychostimulants such as methylphenidate and dextroam­phetamine may be useful in patients with prominent symptoms of psychomotor retardation.
161
ey usually begin alleviating depressive symptoms within 2days and so can be particularly helpful in patients with short life expectancies.
144
they are dosed twice daily, in the early morning and again at noon, to avoid nocturnal insomnia. Dose adjustments can be made every 2–3days.
Anxiety
Anxiety occurs commonly in cancer patients; estimates of prevalence are between 30% and 50%. portion of cancer patients, perhaps around 10%, will have a primary anxiety disorder (panic disorder, phobias, or gener­alized anxiety disorder).
142
Temporary anxiety around specic events (e.g., awaiting test results, before clinic visits or proce­dures) is common and not pathologic. However, when anxiety becomes pervasive, or limits a patient’s ability to participate in daily activities or necessary medical care, it should be treated.
162,163,164
An unclear pro-
158,159
Generally
Anxiety may be secondary to a variety of conditions, includ­ing drug eects (especially glucocorticoids and antidopamin­ergic agents), drug or alcohol withdrawal, uncontrolled pain or dyspnea, and depression.
Anxiety responds well to cognitive or psychotherapeutic
interventions,
153
and prompt referral for more challenging situations is important. Complementary interventions such as aromatherapy, massage, progressive muscle relaxation, and guided imagery therapy can be helpful.
165,166
Pharmacologic treatment of anxiety is used for temporary, incidental anxi­ety and for chronic, pervasive symptoms. Incidental anxi­ety– such as before a procedure– best responds to cognitive interventions; however, pretreatment with short-acting ben­zodiazepines is the pharmacologic mainstay. Longer-term treatment of anxiety is more complicated and best performed in conjunction with a patient’s primary provider or a mental health professional. Scheduled, low-dose long-acting benzodi­azepines (such as clonazepam or sustained-release alprazolam) are eective but run the risk of excessive sedation, tolerance, and abuse. Buspirone is a non-benzodiazepine anxiolytic that has minimal abuse potential but, like SSRIs, takes several weeks to be eective. anxiety disorder as well.
167
SSRIs may be eective for generalized
168
SSRI dosing is similar for anxiety as
for depression.
309
Section X:Specialized interventional techniques in cancercare
Coordinating care in patients with advancedcancer
Patients with advanced cancer and multiple cancer-related symptoms require coordinated multidisciplinary management to optimize care. As one of the many specialists who will be involved in the care of these patients, interventional oncolo­gists have an opportunity and responsibility to help coordinate care. Many dierent practice models exist and the specialists involved will vary from patient to patient. In some patients, such as those with end-stage hepatocellular carcinoma, the interventional oncologist may be the patient’s primary phy­sician coordinating care. In others, the palliative care physi­cian, medical oncologist, surgical oncologist, or hepatologist may be coordinating care, with the interventional oncologist in a consultant role. Whatever the role assumed in a particular patient, communication amongst the managing physicians is critical.

Summary

As stated earlier, palliative care is focused on symptom relief and maximizing patient function, without necessarily impact­ing the natural history of the underlying disease. As the eld of interventional oncology matures, interventional radiologists caring for patients with advanced cancer will need to be com­fortable with the management of common clinical problems encountered in this patient population. ey will need to feel comfortable with communicating prognosis and other critical information to patients and their families. Working in con­cert with colleagues in other clinical cancer specialties, inter­ventional oncologists will be able to oer therapeutic options which will maximize quantity and quality of life and help to optimally manage the many common symptoms in this chal­lenging and rewarding patient population.

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128. Patrick D, Gagnon DD, Zagari MJ, etal. Assessing the clinical signicance of health-related quality of life (HRQoL) improvements in anaemic cancer patients receiving epoetin alfa. Eur J Cancer 2003; 39:335–345.
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132. Monti M, Castellani L, Berlusconi A, Cunietti E. Use of red blood cell transfusions in terminally ill cancer patients admitted to a palliative care unit. J Pain Symptom Manage. 1996; 12:18–22.
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143. Pirl WF. Evidence report on the occurrence, assessment, and treatment of depression in cancer patients. J Natl Cancer Inst Monograph. 2004; 32:32–39.
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Chapter
CT-guided neurolysis for cancer-related abdominal and pelvicpain
30
Ashrafabet

Introduction

Cancer-related abdominal and pelvic pain is unfortunately common. pancreatic cancer suer from substantial pain. ment of cancer-related pain is challenging, with systemic anal­gesic therapy being, in general, the rst-line treatment.
atic cancer, pain is not well controlled by such analgesics. Compounding this challenge is the side-eect prole of
1,2,3,4,5,6
For instance, up to 70–80% of patients with
2,4,5,6
e treat-
7,8,9
Unfortunately, for up to one-third of patients with pancre-
opiates– including nausea, vomiting, constipation, and seda­tion– that can paradoxically degrade quality of life. Managing cancer-related pain refractory to such analgesic therapy requires additional strategies that demand a multidisciplinary approach, including surgery, radiation oncology, pain medi­cine, and interventional radiology.
Image-guided neurolysis represents an important strategy
in battling cancer-related abdominal and pelvic pain.
7,10
Celiac plexus neurolysis (CPN) is the most common type and can be a very eective adjunctive therapy; it may have a lasting eect in 70–90% of patients with pain related to abdominal malig-
1,11,12
nancy.
e keys to treatment success with image-guided neurolysis are to: (1) review cross-sectional imaging, usu­ally computed tomography (CT); (2)understand the relevant anatomy; (3)inject sucient volume of neurolytic agent; and (4)ensure adequate spread of neurolytic agent.
1
Although the terms have been used interchangeably, a neurolysis procedure should be distinguished from a “block.”1 Neurolysis refers to permanent disruption of neural pathways that mediate pain, usually with agents such as ethanol or phe­nol, whereas a block refers to temporary disruption with local anesthetics or steroids.
1,13,14,15
Neurolytic eects, however, may last no more than 3–6months due to neural regeneration and tumor growth.
Ethanol at a 95–100% concentration is a commonly used neurolytic agent.1 One disadvantage is transient pain expe­rienced during instillation; lidocaine or bupivacaine may be instilled rst or mixed with ethanol to reduce intraproce­dural pain. Alternatively, phenol may be used as a neurolytic agent. It has a local anesthetic eect and so intraprocedural pain is less common. However, it is a less potent neurolytic and is more viscous than ethanol, which limits mixing with
contrast material. monly usedagent.
Various modalities for imaging guidance have been described, including uoroscopy, CT, and endoscopic ultra­sound. CPN may be performed using CT guidance or CT uor­oscopy given the excellent delineation of anatomic structures as well as spread of contrast agent aorded by CT at the time of neurolysis.
7,8,9

Celiac plexus neurolysis

e celiac plexus is a complex network of neural bers and gan­glia that mediate aerent as well as sympathetic and parasym­pathetic eerent information for the upper abdominal viscera. It does not mediate nociceptive stimuli from the musculoskel­etal system or abdominal wall.1 Hence, neurolysis of the celiac plexus may be performed for cancer-related upper abdominal
1,11
pain.
Longer-lasting pain relief may be achieved when per-
forming the procedure earlier in the disease process.
Contraindications to CPN include uncorrectable coagulop­athy and/or thrombocytopenia, and intra-abdominal infection or sepsis. Bowel obstruction is also a contraindication, as neu­rolysis of the sympathetic eerents mediated by the plexus may transiently impact bowel motility.
Anatomy
e celiac plexus is situated along the anterolateral surface of the aorta extending from the origin of the celiac artery to that of the superior mesenteric artery. work is comprised of aerent bers from abdominal viscera that carry nociceptive information, sympathetic eerent b­ers that travel via the greatest, greater, and lesser splanchnic nerves from the T5–T12 sympathetic ganglia along the verte­bral column to the celiac ganglia, as well as parasympathetic eerent bers from the vagus nerve. tion includes bowel extending from the distal esophagus to transverse colon, pancreas, liver, biliary tract, kidneys, adre­nal glands, proximal ureters, and mesentery. relief and side eects of CPN– the latter including transient orthostatic hypotension and diarrhea– can be understood by knowledge of the types of neural information transmitted via this network.
1,16,17,18
As such, ethanol is the more com-
1
1,2,19
1
1,11,16,17,20,21
1,11,18,22
Visceral innerva-
is net-
1,11,16,18,20,21,22
Pain
Interventional Oncology, Second Edition, ed. Jean-François H. Geschwind and Michael C.Soulen. Published by Cambridge University Press. ©Cambridge University Press2016
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Section X:Specialized interventional techniques in cancercare
e celiac ganglia may be visualized on CT, and may
mimic a limb of an adrenal gland (Figure30.1).
4,25,26
e right and le ganglia are positioned anterolateral
to diaphragmatic crus.
1,17,27
Hence, neurolysis is performed
1,13,18,20,22,23,2
by instilling a neurolytic agent into the antecrural space (Figure30.2), with spread extending between the celiac and superior mesenteric artery origins. Alternatively, neurolytic may be deposited into the retrocrural space (Figure30.2), where the greatest, greater, and lesser splanchnic nerves course between the sympathetic ganglia along the vertebral column and the celiac ganglia.
1,11
Technique
Coagulation and platelet parameters are checked and corrected. Patients receive intravenous hydration, as transient hypoten­sion is a potential complication. Prior CT imaging is reviewed to ascertain location of tumor, determine whether antecru­ral or retrocrural deposition of neurolytic is appropriate, and determine overall needle approach and patient positioning.
A transcrural approach in which a needle is advanced through the diaphragmatic crus into the antecrural space (Figure30.3) is suitable in many patients who do not have gross tumor inltration in the region of the celiac plexus. Otherwise, a retrocrural technique (Figure30.3) is generally considered when tumor inltrates the antecrural space as this may inhibit neurolytic spread. In addition, masses located within the pan­creatic tail appear to respond more successfully if a retrocrural neurolysis is performed.
28
Positioning and approach
Placing the patient prone facilitates bilateral posterior para­vertebral access to either the antecrural or retrocrural space. One disadvantage is the possibility of transgression of pleura/ lung, risking pneumothorax. CT gantry angulation may help exclude lung. Alateral decubitus position may help reduce ipsi­lateral lung volume. Some patients are unable to lie prone, e.g., because of respiratory diculty, morbid obesity, or severe pain, and a lateral decubitus or oblique position is preferred.
Although an anterior approach with the patient supine is possible, this is rarely needed and considered somewhat riskier
Figure 30.1 Computed tomography appearance of the celiac ganglia.
The right (arrow) and left (arrowhead) ganglia are anterolateral to the diaphragmatic crus and may mimic a limb of the adrenal gland.
given the chance of visceral transgression when advancing a needle through the peritoneal cavity.
1
Other maneuvers may be necessary to facilitate a safe needle path. If a needle path that avoids pleura and lung is not obtain­able, the needle may be advanced into the extrapleural fat along
Figure 30.2 Antecrural and retrocural
approaches to celiac plexus neurolysis.
Retrocrural
Antecrural
Splanchnic Nerves
Sympathetic ganglia
In the antecrural approach, the needle is directed toward the celiac plexus. In the retrocrural approach, the needle is directed toward the splanchnic nerves.
T12
Aorta
Celiac Plexus
Diaphragm
316
Chapter30:CT-guided neurolysis for cancer-related abdominal and pelvic pain
A
Kidney
Aorta
B
Diaphragmatic
Crus
Figure 30.3 (A) Celiac plexus neurolysis,
antecrural technique. Right and left paravertebral approach is illustrated, with neurolytic instilled anterior to aorta between origins of the celiac and superior mesenteric arteries. (B) Retrocrural technique. Neurolytic is instilled posterior to the diaphragmatic crus and posterolateral to the aorta.
Kidney
Diaphragmatic
Crus
the vertebral column. Normal saline may be injected, hydrodis­secting pleura and lung laterally. Occasionally, a paravertebral approach may require a needle path that passes through liver or retroperitoneal organs such as kidney. In such a scenario, it is important to minimize the number of needle punctures through the organ, and in the case of kidney traversal, select a needle path that avoids the renal sinus.
Antecrural
e antecrural site for neurolytic deposition may be selected in patients without gross tumor inltration into the celiac plexus and who do not have masses located within the pancre­atic body/tail.28 Aposterior approach is oen the most direct, and typically bilateral needle placement along the paraverte­bral space is performed. Preliminary CT images are obtained and needle path is selected, targeting the space anterior to the aorta between the origins of the celiac and superior mesenteric
Aorta
1
arteries. Once needle site, depth, and angulation are deter­mined on review of preliminary CT images, local anesthesia (e.g., 1% lidocaine) is administered.
CT, CT-uoroscopy, or cone-beam CT may be used for imaging guidance. A20–22G needle (e.g., Chiba) is typically advanced through either the right or le paravertebral space until the tip lies within 1cm anterior to the aorta. Aspiration is performed prior to every injection to ensure no return of blood products that may suggest vascular intrusion. Subsequently, no more than 5mL dilute contrast (e.g., 1:25–1:40 iopamidol in normal saline) is injected and CT performed to assess con­trast spread (Figure30.4). Adequate positioning is achieved if contrast spread is seen around the anterior aorta and propa­gates in craniocaudal fashion toward the origins of the celiac and superior mesenteric arteries. Contrast spread may also be seen along the celiac and superior mesenteric arteries. Needle adjustment may be necessary if spread is seen predominantly
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Section X:Specialized interventional techniques in cancercare
space. In general, a 20–22G needle is advanced into the ret­rocrural space via the paravertebral approach. Aspiration is performed prior to every injection to make sure there is no vascular intrusion; the major concern is penetration of the aorta or a spinal artery. Approximately 2mL dilute contrast is injected to conrm spread anterior and lateral to the thoracic and lumbar vertebral bodies.1 is is followed with 2mL local anesthetic and 5–10mL 95–100% ethanol.
Smaller volumes of ethanol are used in very small retro­crural spaces or if the bulk of contrast spreads predominantly posteriorly toward the neuroforamina. Rarely, contrast spread is seen to extend to the contralateral retrocrural space, in which case the volume of local anesthetic and ethanol used may be
Figure 30.4 Celiac plexus neurolysis, antecrural technique. The tip of the
needle (short arrow) is anterior to the aorta. Contrast spread along the right (arrowhead) and left (long arrow) aspect of the aorta is seen.
doubled and contralateral procedure avoided. Otherwise, bilat­eral needle placement is required. Care is taken not to inject within the diaphragmatic crus– this may result in pain and may expand the crus in a manner that can narrow or attenuate the retrocrural space, making further needle positioning more
too anteriorly or if contrast predominantly ows backward along the paravertebral space. Ideally, contrast will spread to encompass the celiac ganglia if identiableonCT.
If contrast spread is seen along the ipsilateral aspect of the aorta only, 2mL local anesthetic such as 1% lidocaine is instilled through the needle, followed aer a few minutes with 20 mL 95–100% ethanol. e needle is ushed with either 1–2mL local anesthetic or saline, removed, and the proced­ure is repeated on the contralateral side. If, however, contrast spread is seen to extend unequivocally to the contralateral side (Figure 30.4), the local anesthetic and ethanol volumes are
challenging.
Occasionally, a retroaortic fat plane exists between the ver­tebral disc or body and the posterior wall of the aorta that will enable safe passage of a needle. If this is the case, a needle path from the skin to the contralateral retrocrural space may exist that would enable a single-needle retroaortic retrocrural tech­nique (Figure30.6). In this scenario, the needle is advanced from a paravertebral approach toward the contralateral retro­crural space, traveling posterior to the aorta. Once neurolysis is performed, the needle is ushed and withdrawn into the ipsi­lateral retrocrural space for repeat neurolysis.
doubled and a contralateral procedure may not be required.
Alternative approaches to the antecrural space are available. Atransdiscal approach may be considered in the absence of severe degenerative disc disease; in this scenario, antibiotics (e.g., cefazolin 1gram) are administered at the start of the pro­cedure. A22G needle is advanced through the T12–L1 or L1–L2 disc and along the aorta until the antecrural space is reached at the approximate level of the celiac artery origin.
1,17,18,29
CT gan-
try angulation may help to image along the axis of thedisc.
A transaortic approach to the antecrural space may also be considered in the absence of aortic aneurysm. e pri­mary advantage of this approach is that only a single needle placement is required. e needle is advanced through the aorta into the antecrural space; aspiration is performed prior to every injection to ensure no blood products are seen that may indicate needle tip within vascular lumen. Subsequently, 4mL dilute contrast is injected and CT performed to conrm contrast spread in the antecrural space. is is followed with 2–4mL local anesthetic and 40mL ethanol; the needle is again ushed prior to removal.
Retrocrural
In the setting of pancreatic tail mass and/or gross tumor inl­tration of the antecrural space at the celiac origin on CT, the retrocrural site (Figure 30.5) is selected for neurolysis. e technique is similar to the posterior paravertebral or transdis­cal approaches described previously, with the exception that smaller volumes of injectant are used as it is a more constricted
Outcomes
In one meta-analysis of over 1,100 patients with pain due to one of a number of abdominal malignancies, approximately 90% of patients achieved partial or complete pain relief at 3months and 70–90% had partial or complete pain relief at the time of death.12 One of the key benets of CPN is the reduction of postprocedure opiate dependence, which reduces the risk of opiate-related side eects. In a meta-analysis of six randomized controlled trials, patients who underwent CPN experienced statistically signicant pain relief that correlated with reduc­tion in both opiate use as well as associated constipation and no major complications.
9
Complications
Although some patients are referred for CPN as inpatients, the procedure may be performed safely in the outpatient setting. In addition to pain relief, some eects of CPN may be seen postinjection; this may be attributable to the types of neural information carried by the celiac network. is includes ortho­static hypotension that is most oen transient (<12hours) and is likely related to neurolytic eect on sympathetic eerents; adequate periprocedure intravenous hydration is hence impor­tant.1 Transient diarrhea may also occur; the mechanism is not completely understood but is presumably related to unop­posed parasympathetic innervation.1 Exceedingly rare reports of paraplegia are found in the literature, probably related to
318