1 Star2 Stars3 Stars4 Stars5 Stars (No Ratings Yet)
Loading...

Nausea and Vomiting


Definition

Nausea is usually defined as the inclination to vomit or as a feeling in the throat or epigastric region alerting an individual that vomiting is imminent. Vomiting is defined as the ejection or expulsion of gastric contents through the mouth, often requiring a forceful event.

Pathophysiology

  • Specific etiologies associated with nausea and vomiting are presented in Table Specific Etiologies of Nausea and Vomiting.
  • Emetogenesity of Chemotetherapeutic agents presents specific cytotoxic agents categorized by their emetogenic potential. Although some agents may have greater emetogenic potential than others, combinations of agents, high doses, clinical settings, psychological conditions, prior treatment experiences, and unusual stimuli to sight, smell, or taste may alter a patient’s response to a drug treatment.
TABLE Specific Etiologies of Nausea and Vomiting
Gastrointestinal Mechanisms
Mechanical gastric outlet obstruction
Peptic ulcer disease
Gastric carcinoma
Pancreatic disease
Motility disorders
Gastroparesis
Drug-induced gastric stasis
Chronic intestinal pseudo-obstruction
Postviral gastroenteritis
Irritable bowel syndrome
Postgastric surgery
Idiopathic gastric stasis
Anorexia nervosa
Intra-abdominal emergencies
Intestinal obstruction
Acute pancreatitis
Acute pyelonephritis
Acute cholecystitis
Acute cholangitis
Acute viral hepatitis
Acute gastroenteritis
Viral gastroenteritis
Salmonellosis
Shigellosis
Staphylococcal gastroenteritis (enterotoxins)
Cardiovascular Diseases
Acute myocardial infarction
Congestive heart failure
Shock and circulatory collapse
Neurologic Processes
Midline cerebellar hemorrhage
Increased intracranial pressure
Migraine headache
Vestibular disorders
Head trauma
Metabolic Disorders
Diabetes mellitus (diabetic ketoacidosis)
Addison’s disease
Renal disease (uremia)
Psychogenic Causes
Self-induced
Anticipatory
Therapy-induced Causes
Cytotoxic chemotherapy
Radiation therapy
Theophylline preparations (intolerance, toxic)
Anticonvulsant preparations (toxic)
Digitalis preparations (toxic)
Opiates
Amphotericin B
Antibiotics
Drug Withdrawal
Opiates
Benzodiazepines
Miscellaneous Causes
Pregnancy
Any swallowed irritant (foods, drugs)
Noxious odors
Operative procedures
TABLE. Emetogenicity of Chemotherapeutic Agents
Level 1 (less than 10% frequency)
Androgens
Bleomycin
Busulfan (oral < 4 mg/kg per day)
Capecitabine (oral)
Chlorambucil (oral)
Cladribine
Corticosteroids
Doxorubicin (liposomal)
Fludarabine
Hydroxyurea
Interferon
Melphalan (oral)
Mercaptopurine
Methotrexate (50 mg/m2)
Thioguanine (oral)
Tretinoin
Vinblastine
Vincristine
Vinorelbine
Level 2 (10%– 30% frequency)
Asparaginase
Cytarabine (<1 g/m2)
Docetaxel
Doxorubicin HCl (<20 mg/m2)
Etoposide
Fluorouracil (<1 g/m2)
Gemcitabine
Methotrexate (>50 mg/m2; <250 mg/m2)
Mitomycin
Paclitaxel
Teniposide
Thiotepa
Level 3 (30%– 60% frequency)
Aldesleukin
Cyclophosphamide (intravenous, 750 mg/m2)
Dactinomycin (1.5 mg/m2)
Doxorubicin HCl (20– 60 mg/m2)
Epirubicin HCl (90 mg/m2)
Idarubicin
Ifosfamide
Methotrexate (250– 1000 mg/m2)
Mitoxantrone ( 15 mg/m2)
Level 4 (60%– 90% frequency)
Carboplatin
Carmustine (< 250 mg/m2)
Cisplatin (<50 mg/m2)
Cisplatin (<50 mg/m2)
Cyclophosphamide (>750 mg/m2 to 1500 mg/m2)
Cytarabine (1 g/m2)
Dactinomycin (> 1.5 mg/m2)
Doxorubicin HCl (>60 mg/m2)
Irinotecan
Melphalan (intravenous)
Methotrexate (>1 g/m2)
Mitoxantrone (>15 mg/m2)
Oxaliplatin
Procarbazine (oral)
Level 5 (>90% frequency)
Carmustine (>250 mg/m2)
Cisplatin (>50 mg/m2)
Cyclophosphamide (>1500 mg/m2)
Dacarbazine (500 mg/m2)
Lomustine (>604 mg/m2)
Mechlorethamine
Pentostatin
Streptozocin
  • A variety of other common etiologies have been proposed for the development of nausea and vomiting in cancer patients. These are presented in Table Nonchemotherapy Etiologies of Nausea and Vomiting in Cancer Patients.
  • The three consecutive phases of emesis include nausea, retching, and vomiting. Nausea, the imminent need to vomit, is associated with gastric stasis. Retching is the labored movement of abdominal and thoracic muscles before vomiting. The final phase of emesis is vomiting, the forceful expulsion of gastric contents due to gastrointestinal (gastrointestinal) retroperistalsis.
  • Vomiting is triggered by afferent impulses to the vomiting center, a nucleus of cells in the medulla. Impulses are received from sensory centers, such as the chemoreceptor trigger zone, cerebral cortex, and visceral afferents from the pharynx and gastrointestinal tract. When excited, afferent impulses are integrated by the vomiting center, resulting in efferent impulses to the salivation center, respiratory center, and the pharyngeal, gastrointestinal, and abdominal muscles, leading to vomiting.
  • The chemoreceptor trigger zone, located in the area postrema of the fourth ventricle of the brain, is a major chemosensory organ for emesis and is usually associated with chemically induced vomiting.
TABLE. Nonchemotherapy Etiologies of Nausea and Vomiting in Cancer Patients
Fluid and electrolyte abnormalities
Hypercalcemia
Volume depletion
Water intoxication
Adrenocortical insufficiency
Drug-induced Opiates
Antibiotics
Gastrointestinal obstruction
Increased intracranial pressure
Peritonitis
Metastases
Brainy
Meninges
Hepatic
Uremia
Infections (septicemia, local)
Radiation therapy
  • Numerous neurotransmitter receptors are located in the vomiting center, chemoreceptor trigger zone, and gastrointestinal tract. Examples of such receptors include cholinergic and histaminic, dopaminergic, opiate, serotonin, neurokinin, and benzodiazepine receptors. It is theorized that chemotherapeutic agents, their metabolites, or other emetic compounds trigger the process of emesis through stimulation of one or more of these receptors.

Clinical presentation

  • Nausea and vomiting may be classified as either simple or complex. The term simple applies to those episodes of nausea and/or vomiting described by one of the following criteria: (1) occur occasionally and are self-limiting or relieved by the minimal use of antiemetic methods or medications; (2) account for slight patient deterioration such as fluid-electrolyte imbalances, pain, or noncompliance with prescribed therapies; or (3) are not related to the administration of or exposure to noxious agents.
  • The term complex is used when describing a patient’s clinical course as including symptoms that are not adequately or readily relieved by the administration of a single antiemetic method or medication; that lead to progressive patient deterioration secondary to fluid-electrolyte imbalances, pain, or noncompliance with prescribed therapies; or that are caused by noxious agents or psychogenic events.
  • Nausea and vomiting occur frequently after operative procedures; those of the abdomen, eye, ear, nose, and throat are generally associated with higher incidences of nausea and vomiting than other procedures. Women experience a threefold higher incidence of nausea and vomiting compared to men, independent of the type of operation or anesthetic. Children are about twice as susceptible as adults.
  • Other risk factors that may be associated with an increase in postoperative symptoms include patient variables such as obesity, increased age, a history of motion sickness or prior postoperative emesis, as well as drug therapy variables such as the choice of premedication or general anesthetic agent.
  • Many women experience nausea and vomiting during pregnancy; however, the etiology of hyperemesis gravidarum is not well understood.

Desired outcome

The overall goal of antiemetic therapy is to prevent or eliminate nausea and vomiting; this should be accomplished without adverse effects or with clinically acceptable adverse effects.

Treatment of Nausea and Vomiting

Evaluation of therapeutic outcomes

  • Monitoring criteria for drug therapy includes the subjective assessment of the severity of nausea as well as objective parameters such as the number of vomiting episodes each day, the volume of vomitus lost, and evaluation of fluid, acid-base balance, and electrolyte status, with particular attention to serum sodium, potassium, and chloride concentrations. In addition, evaluation of renal function may become important, particularly in patients with volume contraction and progressive electrolyte disturbances. Specific parameters include daily urine volume, urine specific gravity, and urine electrolyte concentrations.
  • Physical assessment of patients should include evaluation of mucous membranes and skin turgor, since dryness of these tissues may be indicative of significant volume loss.

Leave a Reply

  Subscribe  
Notify of