Nausea and Vomiting



Nausea and Vomiting


John D. Hainsworth



Summary of Key Points


Incidence


• Most common chemotherapy-associated toxicities


• More frequent and severe with repetitive doses of chemotherapy


• Significant impact on quality of life and can influence patient compliance with treatment


Etiology of Complication


• Acute nausea and vomiting often mediated by activation of serotonin type 3 receptors in the gastrointestinal tract


• Mechanism of delayed nausea and vomiting (more than 24 hours after chemotherapy) unknown


Evaluation of the Patient


• Risk factors, including type of chemotherapy (drugs, doses, schedule), age, sex, and prior alcohol use should be assessed before treatment


Grading of Complication


• Episodes of vomiting should be recorded (number, duration, and time to onset); severity of nausea can be graded with a visual analog scale


Treatment


• Optimal treatment provides complete control of acute nausea and vomiting in the majority of patients receiving chemotherapy; only 15% of patients receiving highly emetogenic chemotherapy regimens have severe nausea and vomiting


• Treatment of delayed nausea and vomiting has improved with the introduction of aprepitant and palonosetron; this complication can now be completely controlled in two thirds of patients



Introduction


Nausea and vomiting are common adverse effects associated with systemic chemotherapy and are among the adverse effects most feared by patients.1,2 Although these complications of treatment are usually self-limiting and are seldom life-threatening, the deleterious effects on nutritional status and quality of life can be substantial. Many recently introduced therapeutic antibodies and oral agents have less potential to produce nausea and vomiting. However, combination chemotherapy continues to be the cornerstone of treatment for many types of cancer, ensuring that antiemetic therapy will continue to be an integral aspect of supportive care.


Antiemetic therapy has improved dramatically during the past 20 years. With optimum treatment, most patients receiving highly emetogenic chemotherapy do not experience any nausea or vomiting during the 24 hours after treatment.3–11 However, delayed symptoms are more common and are often underestimated by treating physicians and nurses.12 Accurate assessment of delayed nausea and emesis is essential in providing maximal intervention with recently available agents.


The identification of potent new antiemetic agents has been made possible by an improved understanding of the physiology of the emetic reflex. Critical assessment of the optimal use of new agents for patients receiving chemotherapy has been facilitated by the development of reproducible methods of assessing nausea and vomiting and by the conduct of carefully designed, randomized clinical trials.



Physiology of the Vomiting Reflex


The pioneering work of Borison and Wang13 more than 50 years ago provided the basis for understanding the vomiting reflex. In studies using ablative techniques and electrical stimulation with microelectrodes (primarily in decerebrate cats), these investigators proposed the existence of two distinct sites in the brainstem believed to be critical for the control of emesis. The first of the sites, the so-called vomiting center, was thought to be located in the lateral reticular formation of the medulla. Electrical stimulation of this site triggered the vomiting reflex, whereas ablation prevented the vomiting induced by a variety of stimuli. The vomiting center was thought to be located adjacent to the other structures involved in the coordination of vomiting, including the respiratory, vasomotor, and salivary centers, and cranial nerves VIII and X. More recent studies have suggested that the “vomiting center” is actually not anatomically discrete but that the initiation of the vomiting reflex is controlled by a complex system of networks located in the brainstem, including the parvocellular reticular formation, the Bötzinger complex, and the nucleus tractus solitarius.14,15 The networks in this area coordinate complex patterns of motor activity such as the vomiting reflex and are more accurately described as “central pattern generators.”


The second important center identified by Borison and Wang is the chemoreceptor trigger zone (CTZ), located in the area postrema at the ventral aspect of the fourth ventricle. This center, located outside the blood-brain barrier, is exposed to various noxious agents borne in the blood or cerebrospinal fluid. Although electrical stimulation of the CTZ does not produce vomiting, intimate connections to the vomiting center permit stimulation of this center after exposure to blood-borne toxins. Ablation of the CTZ abolishes vomiting induced by these agents.


Although these concepts have been retained and are integral to the current understanding of the vomiting reflex, several other important components have also been recognized. Input from the gastrointestinal tract, predominantly through afferent vagal fibers, is critical in initiating the vomiting reflex after ingestion of noxious substances.16 Incoming vagal afferents connect with the vomiting center directly; an intact CTZ is not essential when vomiting is initiated by this mechanism. It is now known that in addition to ingested substances, some blood-borne substances, including chemotherapeutic agents, can trigger the vomiting reflex through activation of the vagal afferent mechanism.


Two additional components of this complex system involve the vestibular apparatus and the higher brainstem and cortical structures. The vestibular system is involved primarily in initiating the vomiting reflex in persons with motion sickness. Input from higher cortical centers seems to be critical in a variety of conditions, including anticipatory emesis seen in patients who have previously experienced chemotherapy-induced emesis. The various components of the vomiting reflex are illustrated diagrammatically in Figure 42-1, along with the clinical situations in which they are operative. Given the complexity of this system, it is not surprising that different pharmacologic approaches are necessary to control vomiting of different etiologies.


image
Figure 42-1 Schematic diagram of the various pathways for initiation of the vomiting reflex. Clinical syndromes mediated by each mechanism are illustrated.

Improved understanding of the neurochemistry of the emetic reflex has been important in developing antiemetic agents with new mechanisms of action. The initial focus of such investigation was the area postrema, where receptors for a large number of neuroactive agents have been identified.19–19 Many of these neurotransmitters (e.g., dopamine, histamine, acetylcholine, norepinephrine, and substance P) are in themselves emetogenic agents. The development of pharmacologic agents that block specific sets of receptors (e.g., dopamine and neurokinin-1 [NK1]) has resulted in the identification of valuable antiemetic drugs, and it is likely that continued efforts in this area will yield additional valuable agents in the future.


In addition to neurotransmitters located in the CTZ, type 3 serotonin (5-hydroxytryptamine 3 [5-HT3]) receptors are present in large quantities on vagal and splanchnic afferents within the gastrointestinal tract.20 These peripheral receptors are pivotal in the initiation of the acute nausea and vomiting caused by cisplatin and other strongly emetogenic chemotherapeutic agents; inhibition of this pathway by specific 5-HT3 receptor antagonists results in highly effective antiemetic therapy.21



Clinical Features of Chemotherapy-Induced Emesis


Clinical Syndromes


Chemotherapy-induced nausea and vomiting can be subdivided into three distinct clinical syndromes, each having specific therapeutic implications. These syndromes and their clinical correlates are defined here; treatment approaches are considered later in the chapter. Because nausea and vomiting are common symptoms among patients with cancer, etiologies other than chemotherapy should also be considered. Among the diverse causes of nausea and vomiting in patients with cancer are intestinal obstruction, liver metastases, central nervous system involvement, and other medications (particularly narcotic analgesics). These etiologies should be considered, especially when the time course or duration of nausea and vomiting is unusual for the known chemotherapy-induced syndromes.



Acute Nausea and Vomiting


Acute nausea and vomiting after the administration of chemotherapy occur within 24 hours after the chemotherapy dose. The nausea and vomiting are the most severe during this phase, hence the emphasis on therapeutic intervention at this stage. With most chemotherapeutic agents, acute nausea and vomiting begin 1 to 2 hours after intravenous (IV) administration. This delay in onset argues against a direct effect at the CTZ, which would be expected to produce emesis within minutes of IV drug administration. A peripherally mediated vomiting reflex, probably serotonin release from small intestinal mucosa, offers a better explanation of the delayed onset of emesis.22 The onset of nausea and vomiting after the IV administration of cyclophosphamide is delayed even longer than with other agents, typically occurring 9 to 18 hours after administration of the drug.23 The mechanism of cyclophosphamide-induced nausea and vomiting is unclear; the difference in the time of onset suggests that the mechanism might differ from that of other agents.



Delayed Nausea and Vomiting


Delayed nausea and vomiting occur 24 or more hours after administration of chemotherapy. Although the severity is decreased in comparison with acute nausea and vomiting, the course can be more protracted, resulting in significant difficulties with hydration, nutrition, and performance status. Delayed emesis is most severe and frequent after administration of high-dose cisplatin; most patients treated with this drug experience some degree of delayed emesis, with onset most frequently occurring 24 to 72 hours after chemotherapy.24 In some patients, onset can occur as late as 4 to 5 days after treatment and can persist for several days. Patients who have poor control of acute nausea and vomiting are more likely to experience delayed nausea and vomiting as well; however, delayed emesis can occur among patients who have complete emetic control during the first 24 hours after administration of chemotherapy.


The pathophysiology of delayed emesis remains unclear, but it seems likely that this syndrome is mediated centrally by different neurotransmitters. 5-HT3 receptor antagonists, which are highly effective in the prevention of acute emesis, have less activity in the treatment of delayed emesis. Conversely, the NK1 receptor antagonists, which block the action of substance P, have consistently shown activity against delayed emesis. Peripheral factors, including residual metabolites of chemotherapeutic agents or gastrointestinal mucosal damage, might also play a role.



Anticipatory Nausea and Vomiting


Anticipatory nausea and vomiting often occur among patients who have experienced poor control of emesis during previous courses of chemotherapy.25 The onset can occur before or during administration of chemotherapy. Because this response is conditioned, certain associations with chemotherapy administration, such as the hospital environment or the oncologist’s office, might trigger the onset of emesis.



Prognostic Factors


Multiple clinical factors that are important in determining the incidence and severity of chemotherapy-induced nausea and vomiting have been identified. These factors include the type of chemotherapy administered, certain patient characteristics, and the antiemetic regimen used (Box 42-1).



Box 42-1   Determinants of Chemotherapy-Induced Nausea and Vomiting






Chemotherapeutic Agents


A four-level classification of IV antineoplastic agents (high, moderate, low, and minimal) is widely accepted and is used to produce recommendations for antiemetic therapy.26,27 Table 42-1 summarizes the emetogenic potential of commonly used IV antineoplastic agents. Drugs in the high-risk category produce emesis in more than 90% of patients and require maximum antiemetic prophylaxis, whereas drugs with minimum risk produce emesis in fewer than 10% of patients and require no routine prophylaxis. The drugs that cause emesis most frequently also cause the most severe emesis. Emesis is most severe during the first 8 hours after onset, but with strongly emetogenic drugs, patients are often ill throughout the 24-hour period after administration.



Table 42-1


Emetogenic Potential of Commonly Used Intravenous Antineoplastic Agents








































































































































































































































Risk Frequency of Emesis (%) (without Prophylaxis) Agent
High >90 Carmustine
    Cisplatin
    Cyclophosphamide ≥1500 mg/m2
    Dacarbazine
    Mechlorethamine
    Streptozocin
Moderate 30-90 Alemtuzumab
    Arsenic trioxide
    Azacitidine
    Bendamustine
    Carboplatin
    Clofarabine
    Cyclophosphamide <1500 mg/m2
    Cytarabine ≥1 g/m2
    Doxorubicin
    Epirubicin
    Eribulin
    Idarubicin
    Ifosfamide
    Irinotecan
    Melphalan ≥50 mg/m2
    Methotrexate ≥250 mg/m2
    Mitoxantrone
    Oxaliplatin
Low 10-30 Bortezomib
    Cabazitaxel
    Cytarabine <1 g/m2
    Cetuximab
    Docetaxel
    Doxorubicin (liposomal)
    Etoposide
    5-Fluorouracil
    Gemcitabine
    Yttrium-90 ibritumomab tiuxetan
    Ixabepilone
    Methotrexate <250 mg/m2
    Mitomycin
    Paclitaxel
    Panitumumab
    Pemetrexed
    Temsirolimus
    Topotecan
    Tositumomab/iodine-131 tositumomab
Minimal <10 Asparaginase
    Bevacizumab
    Bleomycin
    Cladribine
    Fludarabine
    Gemtuzumab ozogamicin
    Ofatumumab
    Pentostatin
    Rituximab
    Trastuzumab
    Vinblastine
    Vincristine
    Vinorelbine

Adapted from Roila F, Herrstedt J, Aapro M, et al. Guideline update for MASCC and ESMO in the prevention of chemotherapy and radiotherapy-induced nausea and vomiting: results of the Perugia consensus conference. Ann Oncol 2010;21(Suppl. 5):v232–43.


Oral agents are increasingly common in the treatment of cancer. Most of these agents have a lower risk of emesis than agents administered intravenously. However, antiemetic therapy can be problematic because of the chronic administration schedules of most oral agents; with prolonged administration, even low-level nausea can become a significant problem. The emetogenic risk of commonly used oral agents is summarized in Table 42-2. In general, the estimates of risk are based on the risk during an entire course of therapy, rather than a single dose. Because nausea or emesis can first occur several days of dosing, it is likely that this problem has been underreported for some of the oral agents.



In general, the potential for acute nausea and vomiting increases with the dose of chemotherapy. The schedule of administration is also important with certain agents: Large IV bolus doses, or doses administered intravenously over a short period, are more likely to cause emesis than are smaller divided doses or continuous infusion.

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Jun 13, 2016 | Posted by in ONCOLOGY | Comments Off on Nausea and Vomiting

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