C Diagnosis and Management of Hiccups in the Patient with Advanced Cancer
Transcription
C Diagnosis and Management of Hiccups in the Patient with Advanced Cancer
r e v i e w Diagnosis and Management of Hiccups in the Patient with Advanced Cancer Mark A. Marinella, MD, FACP C ancer patients experience a variety of disease- and treatment-related respiratory complications that can significantly impair quality of life. Some of the most common of these complications encountered in clinical practice include cough, hemoptysis, dyspnea, airway obstruction, aspiration syndromes, thromboembolic disease, infection, and hiccups.1 Severe hiccups are responsible for approximately 4,000 annual hospitalizations in the United States.2 However, the incidence of prolonged hiccups in the oncology population is unclear, and may be underreported due to the presence of other pressing comorbid complications that commonly occur in the palliative and hospice settings. The typical cancer patient has many and often simultaneous risk factors for developing hiccups, so clinicians providing adjuvant or palliative care should be familiar with the pathophysiology, etiologies, and management of this potentially debilitating complication. Abstract Benign, self-limited hiccups are more of a nuisance, but persistent and intractable hiccups lasting more than 48 hours and 1 month, respectively, are a source of significant morbidity in the patient with advanced malignancy. The hiccup reflex is complex, but stimulation of vagal afferents followed by activation of efferent phrenic and intercostal nerve pathways results in contraction of the diaphragm and intercostal muscles, respectively. The etiology of hiccups in the cancer and palliative care population may include chemotherapy, electrolyte derangements, esophagitis, and neoplastic involvement of the central nervous system (CNS), thorax, and abdominal cavity. Prolonged hiccups can result in depression, fatigue, impaired sleep, dehydration, weight loss, malnutrition, and aspiration syndromes. Evaluation should be symptom-directed, focusing mainly upon the CNS and thoracoabdominal cavities as well as assessment of medications and serum chemistries. Most patients with ongoing hiccups require pharmacotherapy, with chlorpromazine being the only US Food and Drug Administration-approved agent. However, numerous other medications have been reported to be efficacious for treating intractable hiccups. Gabapentin has recently been shown to terminate hiccups effecitvely in cancer patients and may emerge as a therapy of choice in the palliative setting due to favorable tolerability, pain-modulating effects, minimal adverse events, and lack of drug interactions. Definition Hiccups occur when an abrupt, involuntary spasm of the diaphragm and intercostal muscles is followed by sudden closure of the glottis, generating the characteristic onomatopoeic “hic” sound.3–6 The medical term for hiccups, singultus, is of Latin origin and means to gasp or sigh.7 Hiccups were first attributed to phrenic nerve irritation by Shortt in 1833.8 Clinically, most hiccup episodes are benign, of acute onset, and self-limited, typically ceasing within minutes.6 However, persistent and intractable hiccups are defined as lasting for more than 48 hours or 1 month, respectively.6,9 Manuscript submitted July 14, 2008; accepted May 26, 2009. Correspondence to: Mark A. Marinella, MD, FACP, Dayton Physicians, LLC, 1382 East Stroop Road, Dayton, OH 45429; telephone: 937-293-4383; fax: 937-293-4365; e-mail: [email protected] J Support Oncol 2009;7:122–127, 130 122 © 2009 Elsevier Inc. All rights reserved. Pathophysiology The pathogenesis of hiccups is complex and not fully understood but is generally mediated from a variety of etiologies with similar neurophysiologic mechanisms resulting in diaphragmatic contraction and spasm.1,2 Interestingly, hiccup episodes involve unilateral contraction of the left hemidiaphragm in approximately 80% of cases.9,10 The frequency of hiccups ranges from 4–60/minute, with little intraindividual variability.10,11 There is no clear physiologic purpose of hiccups, although this remains debated. The hiccup-reflex arc is composed of afferent and efferent limbs and a central hiccup center.6,12–14 The afferent pathway consists of the vagus nerve (cranial nerve X), the phrenic nerve (derived from cervical segments C2–C4), and the sympathetic chain (derived from thoracic segments T6– T12).14 The sympathetic nervous system may play www.SupportiveOncology.net Dr. Marinella is a practicing medical oncologist, HematologyOncology of Dayton, and Assistant Clinical Professor, Department of Internal Medicine, Wright State University School of Medicine, Dayton, Ohio. The Journal of Supportive Oncology Marinella some role in the generation and/or propogation of hiccups, as they cease after administration of the beta-receptor antagonist carvedilol.15 The vagus nerve, in particular, can be activated in various anatomic areas (thoracic and abdominal viscera as well as within head and neck structures). For instance, irritation of the auricular branch of the vagus nerve (Arnold’s nerve), which innervates the auditory canal, by cerumen, foreign bodies, bugs, and even hair, has resulted in hiccups.16 CNS areas such as the brainstem respiratory center, the reticular activating system (RAS) in the medulla oblongata, the hypothalamus, and temporal lobes are also involved in the pathogenesis of hiccups, although their precise contributions remain to be elucidated.6,17 Release of 5-hydroxytryptamine from gut enterochromaffin cells and enteric vagal afferents following administration of various chemotherapeutic agents (especially cisplatinum) may lead to hiccups.18 An additional mechanism of stimulating the hiccup arc is via stimulation of the chin integument. Stimulation of the chin via shaving produced transient hiccups in two patients.16 The authors postulated that sensory afferents to the spinal tract of the trigeminal nerve project to the RAS, which subsequently recruits activation of the phrenic nerve nucleus leading to stimulation of the efferent hiccup arc.16 In these patients, the hiccups disappeared after anesthetizing the mental nerve, suggesting that the trigeminal nerve plays a role in the hiccup mechanism. The efferent pathway of the hiccup arc primarily consists of the phrenic nerve, the primary motor input to the diaphragm.6,13,14 Additionally, the external intercostal (derived from segments T1–T11) and the scalenus anticus nerves stimulate contraction of the intercostal and scalene muscles, respectively.1–6 Shortly after activation of the hiccup arc, the recurrent laryngeal nerve stimulates closure of the glottis, resulting in the characteristic “hic” sound.2 Significant acute negative intrathoracic pressure may occur, resulting as hypotension, bradycardia, pneumomediastinum, and subcutaneous emphysema.6,19 Mathew20 studied the effects of neonatal hiccups on systemic arterial pressure and noted acute, transient declines in systolic pressures that were attributed to decreased stroke volume and vascular resistance. This decline in vascular resistance appears to result from increased dilation and volume of the thoracic aorta induced by decreases in hiccup-associated intrathoracic pressure.20 Whether hiccupassociated systolic hypotension is deleterious to cardiovascular function in adults is unclear, but it remains a plausible etiology of pathologic hemodynamic changes in those patients with underlying heart disease. Hiccups often follow acute gastric distention in such situations as endoscopy, rapid ingestion of food or carbonated beverages, gastric outlet obstruction, or small bowel obstruction— all of which are believed to stimulate gastric vagal afferent activity.2,3,6 Gluck and Pop21 reproducibly demonstrated the induction of acid-induced hiccups via esophageal acid perfusion in a patient with chronic hiccups. Additionally, esophageal distention has been implicated to cause hiccups via stimulation of mechanoreceptors and is the presumed pathogenic cause of hiccups associated with achalasia, esophageal tumors, strictures, and food impaction.2–6,21 Indeed, Fass et al22 induced acute, transient hiccups in 40% of healthy subjects with inflation of proximal esophageal balloons. Interestingly, all of the patients in this study who developed hiccups were men.22 This finding is in keeping with recent studies revealing a significant male predominance of hiccups in patients receiving cytotoxic chemotherapy.18,23 The mechanisms for male predominance of hiccups in these studies are not explained. Because a variety of processes can result in hiccups, it remains most likely that Volume 7, Number 4 ■ July/August 2009 www.SupportiveOncology.net Table 1 Etiologies of Hiccups in the Patient with Cancer Malignancy Esophagogastric cancer Colon cancer Hepatoma Leukemia Lung cancer Lymphoma Pancreatic cancer Renal cancer Liver metastasis Metabolic Derangements Hyponatremia, hypokalemia, hypocalcemia Renal failure Uremia Uncontrolled diabetes mellitus Hypoadrenalism CNS Pathology Brain tumors (eg, gliomas, metastatic tumors) Stroke Hematoma/cerebral hemorrhage Encephalitis/meningitis Brain abscess/toxoplasmosis Cardiovascular Disorders Myocardial ischemia/infarction Pericardial effusion/pericarditis Thoracic/Pulmonary Disorders Pneumonia Pleural effusion/pleuritis Thoracic herpes zoster Mechanical ventilation Gastrointestinal Disorders Erosive esophagitis Infectious esophagitis (eg, herpes simplex, Candida species) Peptic ulcer disease Gastric distention from food, liquid, air, endoscopy Gastric outlet or small bowel obstruction Pancreatitis Ascites Cholecystitis Subdiaphragmatic abscess Surgical Procedures/General Anesthesia Epidural Injections with Local Anesthetics Psychogenic 123 Advanced Cancer: Diagnosis and Management of Hiccups Table 2 Causes of Drug-induced Hiccups Utilized in Cancer Care Antibiotics Benzodiazepines Corticosteroids (especially dexamethasone) Anabolic steroids Perphenazine General inhalational anesthesia Opioids Chemotherapeutic agents (significant male predominance) Cisplatinum Carboplatin Cyclophosphamide Docetaxel Etoposide Gemcitabine Irinotecan Paclitaxel Vindesine Vinorelbine stimulation of the vagus or phrenic nerves, diaphragm, head and neck structures, or CNS areas by anatomic lesions; metabolic derangements; or drugs induce hiccups through complex neural mechanisms that continue to be elucidated. Etiologies of Hiccups in Patients with Cancer Perhaps more than any patient population in medicine, those with malignancy represent some of the most medically complex situations due not only to cancer and metastasis but also to unrelated comorbidities; supportive pharmacologic treatments; infectious complications; and anticancer therapies such as chemotherapy, radiotherapy, and surgery. As such, many potential mechanisms for induction of the hiccup reflex exist, with many patients possessing several factors, often making it difficult to pinpoint the exact etiology. Tables 1 and 2 display some of the most commonly reported causes of hiccups in the cancer population. Overall, pathology of the gastrointestinal tract, thoracic viscera, and CNS is among the most common etiologies of persistent and intractable hiccups.2,5,6 For instance, erosive or infectious esophagitis is common in the cancer and palliative care setting, as is gastric distention resulting from malignant gastric outlet and small bowel obstruction.24–26 In addition, pneumonia, malignant pleural effusion, empyema, and chest wall zoster may invoke the afferent hiccup arc and lead to singultus.1,6,8,27 Stimulation of various CNS centers involved with the physiology of hiccups by primary or metastatic brain tumors, stroke, cerebral hemorrhage, abscess, meningoencephalitis, or malignant hydrocephalus may also be etiologic.28–33 Various metabolic derangements, most commonly hyponatremia, may induce the hiccup reflex.34,35 Hypoadrenalism has been reported to result in hiccups.36 Myocardial infarction is a well-described precipitant of hiccups and likely results from ischemic 124 www.SupportiveOncology.net activation of vagal pathways.37 Thoracic, abdominal, or pelvic tumors invading the diaphragm or vagus nerve may stimulate hiccups.2–6,38,39 Drug-induced causes are protean, with benzodiazepines, corticosteroids, antibiotics, opioids, and cytotoxic agents among the most common in patients with cancer. A more extensive listing can be found in Table 2.40–49 A study by Takiguchi et al23 showed a significant male predominance of hiccups following cytotoxic chemotherapy. Patient Evaluation Acute, self-limited hiccups of less than 48 hours’ duration typically do not require exhaustive evaluation. Persistent and intractable hiccups without obvious explanation, such as those precipitated by a drug, usually require a diagnostic evaluation to exclude potentially treatable or life-threatening precipitants. A meticulous physical examination with attention to head and neck structures, heart, lungs, chest wall, skin, abdomen, and CNS should be performed. The external auditory canals should be examined to exclude inflammation, foreign bodies, hairs, or impacted cerumen.16,50 Careful neurologic examination with attention to dysfunction of each of the hiccupproducing areas (eg, afferent limb, CNS structures, and efferent limb) should be performed.2 If cancer is suspected, a search for lymphadenopathy or mass lesions is essential. Site-directed imaging studies such as chest radiography, abdominal radiography, CT, or MRI should be obtained if any element of the history or physical examination suggests an etiology affecting a particular organ system. Examples could include pneumonia, ileus or bowel obstruction, brain metastasis, or intra-abdominal malignancy. In patients with odynophagia or dysphagia, upper endoscopy should be performed to detect erosive or infectious esophagitis, stricture, or malignancy.26 Electrocardiography should be obtained to exclude myocardial ischemia.4,6,37 Basic laboratory studies including serum electrolytes and creatinine levels should be routine, because hyponatremia is a common etiology of hiccups in acutely ill patients, although hypocalcemia, hypokalemia, or renal failure may be discovered.6,34,35 Other invasive studies such as lumbar puncture to exclude CNS infection or bronchoscopy to exclude infection or a neoplasm should be performed only on a caseby-case basis. Complications of Persistent and Intractable Hiccups Table 3 displays some of the most common complications of ongoing hiccups that may be encountered in the patient with cancer. General complications of intractable hiccups include anxiety and exacerbation of depressive symptoms, both of which are common in patients with advanced or terminal cancer.1,5,6 Sleep impairment due to nocturnal hiccups minimizes necessary restorative sleep and leads to daytime somnolence and fatigue, which may worsen anxiety, depression, appetite, and cognitive function.51 Chronic hiccups increase energy expenditure through conThe Journal of Supportive Oncology Marinella traction of skeletal muscles; this result increases caloric requirements, which are often difficult to meet in patients who are receiving chemotherapy or radiation therapy. Hiccups may interfere with the intake of fluids and food, leading to poor caloric intake, which can result in malnutrition, weight loss, and dehydration. Volume depletion and dehydration may result in decreased renal blood flow and impaired elimination of neurotoxic opioid metabolites. If a hiccup paroxysm occurs during food ingestion, aspiration may lead to life-threatening acute airway obstruction or aspiration pneumonitis and respiratory failure. Negative intrathoracic pressures generated during severe hiccup paroxysms may result in pneumomediastinum.6,17,20 Hypotension may result from mechanisms mentioned previously and may be more likely to occur in the setting of hypotension or underlying cardiovascular dysfunction.20 Dehiscence of sternal and other surgical incisions has been described.6,19 Some authors have reported death as a complication of intractable hiccups, although multiple comorbidities in the cancer population make this distinction difficult.3–6 Table 3 Complications of Hiccups Anxiety Arrhythmia Aspiration syndromes Bradycardia/heart block Carotid dissection Dehydration Depression Dyspnea/hypoxia Fatigue Malnutrition Pneumomediastinum Sleep deprivation Speech impairment Subcutaneous emphysema Vomiting Weight loss Wound dehiscence Patients with persistent or intractable hiccups usually require pharmacologic intervention, especially if quality of life is impaired or medical complications are apparent.52,57 The only medication approved by the US Food and Drug Administration (FDA) for hiccups is the antipsychotic phenothiazine chlorpromazine, which may not be optimal for all patients due to adverse effects such as hypotension, urinary retention, glaucoma, or delirium (Table 4).4,6,57 Treatments dating to the 1970s and 1980s include the anticonvulsants phenytoin, valproic acid, and carbamazepine.6,52,58 These drugs may inhibit hiccups at the central level through blockade of neural sodium channels but possess a narrow therapeutic index and the tendency for multiple drug interactions, making them less than optimal in patients with advanced cancer who typically receive numerous medications. Amitriptyline, an older tricyclic antidepressant, may terminate hiccups but is associated with significant adverse effects, mainly of an anticholinergic nature.6 Metoclopramide has been utililzed for at least 20 years and is often effective for termination of hiccup, most likely through central dopaminergic blockade.57,59 Haloperidol, a dopamine antagonist, may be useful in patients with concurrent agitated delirium, but monitoring for extrapyramidal symptoms is important.34,52,57 The antispasmodic GABA (gamma aminobutyric acid) antagonist baclofen has some efficacy for the treatment of intractable hiccups but may not be well tolerated by elderly patients due to the frequent occurrence of ataxia, delirium, dizziness, and sedation.36,57 The calcium channel blocker nifedipine has been reported to terminate persistent hiccups but has a propensity for inducing hypotension, which may be especially severe in volumecontracted patients or those receiving opioids.60,61 Nimodipine is a newer calcium channel blocker that has been reported to be effective in a few case reports.62 The mechanism of hiccup termination with nifedipine and nimodipine is likely secondary to blockade of neuromuscular calcium channels.60–62 Bolus intravenous infusion of the sodium channel–blocking anesthetic lidocaine has terminated hiccups in postoperative patients, but the risk for cardiovascular and neurologic toxicities should be considered in the frail patient with advanced malignancy.63 Nebulized lidocaine may be effective via a local anesthetic effect upon irritant sensory afferents and has a much greater safety profile than does the intravenous route.64 Similarly, nebulized saline solution has been reported by some authors to terminate hiccups in the palliative care settting.65 Although benzodiazepines, especially valium, are wellknown precipitants of hiccups, the intravenous agent mida- Volume 7, Number 4 ■ July/August 2009 www.SupportiveOncology.net Nonpharmacologic Options Benign, self-limited hiccups do not require pharmacologic or invasive maneuvers for termination. However, some patients may attempt folk remedies and other nonpharmacologic approaches, which may be acceptable if clinically appropriate. Some folk remedies that anecdotally have been reported to terminate hiccups include stimulation of the palate or pharynx with a cotton applicator or catheter; traction on the tongue; pressure over the eyebrow area; lifting the uvula with a spoon; performing a Valsalva maneuver; gargling or drinking ice water; eating a spoonful of granulated sugar or peanut butter; drinking water from the opposite side of a cup; biting a lemon; black pepper–induced sneezing; sudden fright; breathholding; and breathing into a paper bag. Increased pCO2 and cerebral vasoconstriction may be the physiologic explanation for hiccup cessation following breath-holding or paper bag breathing.6,16,52–54 Digital rectal massage has been reported to be effective at terminating intractable hiccups in small case series55,56; however, this measure is uncomfortable and should not be attempted in the setting of neutropenia or severe perianal dermatitis. Of course, not all these approaches are appropriate for a given patient, but they may be worth trying if they would not be detrimental for an individual patient. Pharmacologic Treatment 125 Advanced Cancer: Diagnosis and Management of Hiccups zolam has been successfully utilized in patients with terminal hiccups.66 Midazolam infusion may be especially useful if intractable hiccups occur in the setting of refractory terminal delirium or agitation. The neurostimulant methylphenidate may terminate hiccups through inhibition of dopamine and norepinephrine uptake. Patients with concurrent depression or opioid-induced sedation may be good candidates for methylphenidate treatment of hiccups.67,68 Nefopam, an intravenous nonopioid analgesic structurally related to antiparkinsonian and antihistaminic medications, has been reported to abruptly terminate hiccups in three patients with refractory hiccups, one of whom had acute leukemia.69,70 Carvedilol suppressed a 2-year bout of hiccups in a patient with tardive dyskinesia.15 Although the mechanism is unclear, antagonism of the sympathetic component of the afferent hiccup arc may be responsible. Whether beta-adrenergic antagonists as a class are useful for treating hiccups is unclear, as data are insufficient. Dexamethasone, although a recognized cause of hiccups,71,72 has terminated persistent hiccups in patients with acquired immunodeficiency syndrome (AIDS) with progressive multifocal leukoencephalopathy.73 Because patients with advanced or terminal malignancy are often receiving numerous medications and have multiple comorbidities and organ dysfunction, a pharmacologic agent with minimal adverse effects and drug interactions would be of benefit. Recently, case series of the effectiveness of gabapentin on the termination of intractable hiccups have been reported.45,75 Gabapentin, a newer antiepileptic drug commonly utilized in cancer and palliative medicine as an adjuvant pain medication, produces blockade of neural calcium channels and increases release of GABA, which may modulate diaphragmatic excitability.74,76 Gabapentin is not hepatically metabolized and possesses no known significant drug interactions, making it a potentially useful agent in the advanced cancer setting. Low binding to plasma proteins makes gabapentin attractive in cancer patients, who often manifest hypoproteinemia due to malnutrition or liver dysfunction. Porzio et al74 reported effective hiccup cessation with gabapentin in three patients with advanced malignancy, with no obvious adverse effect. Gabapentin may be especially useful for hiccup therapy in patients requiring adjuvant analgesia related to neuropathic cancer pain. Whether gabapentin will emerge as front-line treatment for persistent and intractable hiccups in the palliative care and hospice settings remains to be seen. Other Therapeutic Approaches Acupuncture may provide relief from intractable hiccups. However, it may be difficult to perform in severely ill patients and to find a practitioner with expertise.77,78 Phrenic nerve block with a local anesthetic has been utilized to treat intractable hiccups in several patients with advanced malignancies, including pancreatic, gastric, and lung carci- 126 www.SupportiveOncology.net Table 4 Reported Therapies for Persistent/Intractable Hiccups Pharmacologic therapy Baclofen Carvedilol Chlorpromazine Gabapentin Haloperidol Ketamine Lidocaine infusion Methylphenidate Metoclopramide Nebulized saline or lidocaine Nefopam Nifedipine/nimodipine Olanzapine Phenytoin Valproic acid Irritation of the pharynx with a rubber catheter Digital rectal stimulation Phrenic nerve block with local anesthesia Acupuncture Folk remedies nomas. Calvo et al79 administered a 1% lidocaine solution via ultrasonographic guidance to the area of the phrenic nerve to five cancer patients with intractable hiccups. Hiccups ceased in all five patients within 5 minutes. Hiccups did not recur in three patients, and there were no adverse effects.79 Phrenic nerve injection may be a reasonable option for drug-refractory hiccups if an experienced practitioner is available. Conclusion Prolonged hiccups can lead to many detrimental effects in the cancer and palliative care patient, including depression, poor sleep, exhaustion, malnutrition, weight loss, and aspiration syndromes. Pharmacologic treatment of benign, selflimited hiccups is generally unwarranted, but a variety of noninvasive folk remedies may be attempted in select patients. Chlorpromazine is the only FDA-approved drug for hiccup treatment. However, despite the lack of adequately powered and randomized trials involving hiccup treatment, the literature supports the utility of a variety of agents, including metoclopramide, haloperidol, baclofen, midazolam, and calcium channel antagonists. In a small case series, gabapentin has recently been demonstrated to be effective for the termination of hiccups in patients with advanced malignancy. As gabapentin is well tolerated, with few adverse events and drug interactions, it may be an ideal drug for treating persistent and intractable hiccups in the palliative and advanced cancer setting. Other benefits of gabapentin include pain-modulating and antiseizure effects. Further trials are necessary to define the role of gabapentin in the palliative setting. Conflicts of interest: None to disclose. The Journal of Supportive Oncology Marinella References PubMed ID in brackets 1. Ripamonti C, Fusco F. Respiratory problems in advanced cancer. Support Care Cancer 2002;10:204– 216.[11904785] 2. Schuchmann JA, Browne BA. Persistent hiccups during rehabilitation hospitalization: three case reports and review of the literature. Am J Phys Med Rehabil 2007;86:1013–1018.[18090442] 3. Hansen BJ, Rosenberg J. 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