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David Baxter

Mar 26, 2004
Schizophrenia: A Review
June 15, 2007
by STEPHEN H. SCHULTZ, MD, STEPHEN W. NORTH, MD, and CLEVELAND G. SHIELDS, PhD, University of Rochester School of Medicine and Dentistry, Rochester, New York
Amercian Family Physician, Vol. 76 No. 12
Schizophrenia is a debilitating mental illness that affects 1 percent of the population in all cultures. It affects equal numbers of men and women, but the onset is often later in women than in men. Schizophrenia is characterized by positive and negative symptoms. Positive symptoms include hallucinations, voices that converse with or about the patient, and delusions that are often paranoid. Negative symptoms include flattened affect, loss of a sense of pleasure, loss of will or drive, and social withdrawal. Both types of symptoms affect patients' families; therefore, it is important for physicians to provide guidance to all persons affected by the disease. Psychosocial and family interventions can improve outcomes. Medications can control symptoms, but virtually all antipsychotics have neurologic or physical side effects (e.g., weight gain, hypercholesterolemia, diabetes). There is a 10 percent lifetime risk of suicide in patients with schizophrenia. (Am Fam Physician 2007;75:1821-9, 1830)
Schizophrenia is a devastating mental illness that impairs mental and social functioning and often leads to the development of comorbid diseases. These changes disrupt the lives of patients as well as their families and friends. Family physicians can play an important role in the effective treatment of schizophrenia; they are in a position to recognize the early signs of illness, make referrals to appropriate mental health professionals, help patients and their families cope with the devastating effects of schizophrenia, and encourage a multidisciplinary approach to address all dimensions of the illness.

Risk Factors, Etiology, and Pathophysiology
Schizophrenia has a prevalence of 1 percent in all cultures and is equally common in men and women.1 Men typically present with the disease in their late teenage years or early 20s, whereas women generally present in their late 20s or early 30s.

A family history of schizophrenia is the most significant risk factor (Table 12).3 Other hypothetical risk factors include season and location of birth, socioeconomic status, and maternal infections. However, data supporting these ideas are inconclusive.3,4

Schizophrenia appears to be a polygenic disorder with environmental and developmental factors mediating a person's likelihood of becoming schizophrenic.2 It is unknown if the range of severity and clinical manifestations reflect problems in different brain regions, in different causalities, or in different diseases that share some phenotypic features.2

The Finnish Adoptive Family Study of Schizophrenia has confirmed that genetics plays a major role in the development of schizophrenia.5-8 It also found that persons with a genetic risk of schizophrenia are especially sensitive to the emotional climate of their family environment. A child-rearing environment with infrequent criticism and clear, straightforward communication appears to be protective against the symptomatic expression of this genetic risk.6

The neurotransmitter dopamine also plays an important role. For example, drugs that cause psychoses similar to the positive symptoms of schizophrenia increase dopaminergic neurotransmission, and almost all antipsychotics decrease dopaminergic neurotransmission.9 Still, dopaminergic pathways cannot entirely explain the pathophysiology of schizophrenia, and the roles of other neurotransmitters are being investigated.9

Researchers have examined the possibility of preventive treatment or premorbid screenings for schizophrenia. Currently, no studies have attempted treatment before the onset of definitive symptoms. The risk of false-positive screening results is high, and screening is not yet accurate enough to warrant the cost and harms associated with misdiagnosis.10,11

Schizophrenia is characterized by positive and negative symptoms that can influence a patient's thoughts, perceptions, speech, affect, and behaviors (Table 21). Positive symptoms include hallucinations, voices that converse with or about the patient, and delusions that are often paranoid. Negative symptoms include flattened affect, loss of a sense of pleasure, loss of will or drive, and social withdrawal.

Schizophrenia is also characterized by disorganized thought, which is manifested in speech and behavior. Disorganized speech may range from loose associations and moving quickly through multiple topics to speech that is so muddled that it resembles schizophasia (commonly referred to as "word salad"). Schizophasia is speech that is confused and repetitive, and that uses words that have no apparent meaning or relationship to one another. Disorganized behavior may lead to difficulties in performing daily living activities, such as preparing a meal or maintaining hygiene. It also can manifest as childlike silliness or outbursts of unpredictable agitation.1

No single sign or symptom is pathognomonic of schizophrenia. To make a definitive diagnosis, signs and symptoms must be present for a significant portion of one month (or a shorter period if successfully treated), and some must be present for at least six months. These symptoms also must be associated with marked social and occupational dysfunction.

There are five types of schizophrenia: paranoid, disorganized, catatonic, undifferentiated, and residual.1 Paranoid type is characterized by a preoccupation with one or more delusions or frequent auditory hallucinations; cognitive function and affect remain relatively well preserved.1 Disorganized type is characterized by disorganized speech and behavior, as well as flat or inappropriate affect.1 Catatonic type has at least two of the following features: immobility (as evidenced by stupor or catalepsy); excessive, purposeless motor activity; extreme negativism (e.g., resistance to all instructions, maintenance of rigid posture, mutism); or peculiarities of voluntary movement (e.g., posturing, prominent mannerisms, grimacing).1 A patient is said to have undifferentiated schizophrenia if none of the criteria for paranoid, disorganized, or catatonic types are met.1 Residual type is characterized by the continued presence of negative symptoms (e.g., flat affects, poverty of speech) and at least two attenuated positive symptoms (e.g., eccentric behavior, mildly disorganized speech, odd beliefs). A patient is diagnosed with residual type if he or she has no significant positive psychotic features.1

Of note, this classic typing of schizophrenia can be limiting because patients often are difficult to classify. For that reason, an alternative three-factor dimensional model is given. The three factors are psychotic, disorganized, and negative (deficit). The symptoms are categorized as absent, mild, moderate, or severe.1

Typical Presentation
The onset of schizophrenia can be abrupt or insidious. Most patients undergo a prodromal phase marked by a slow and gradual development of symptoms, such as social withdrawal, loss of interest in school or work, deterioration in hygiene and grooming, unusual behavior, or outbursts of anger. Family members can find this behavior disturbing and difficult to interpret. They may assume that the person is just "going through a phase." Eventually, the appearance of active-phase symptoms (e.g., psychosis) marks the disturbance as schizophrenia.1

Differential Diagnosis
Table 3 outlines common diagnoses that produce symptoms similar to schizophrenia. Because substance abuse can mimic many signs and symptoms of schizophrenia, diagnosis should not be made if the patient is actively using illicit drugs. Patients who present with psychotic features should receive a drug screening as part of their initial evaluation. Those with severe depression or bipolar disorder also may present with psychotic features; however, the diagnosis of a mood disorder always takes precedence over the diagnosis of schizophrenia.

Despite the stability of the diagnostic criteria for schizophrenia, diagnosis often changes over time. In a study of 936 inpatients over seven years, 21.9 percent of those who were initially diagnosed with schizophrenia had their diagnosis changed during subsequent hospitalizations, and 32.8 percent of those who were initially diagnosed with another illness were later diagnosed with schizophrenia. Most diagnostic changes from schizophrenia were to either bipolar disorder or organic disorders. Organic disorders, psychotic disorders, and major depression were the diagnoses most commonly changed to schizophrenia.12

Delirium can have features that are similar to the active symptoms of schizophrenia (e.g., hallucinations, delusions). The etiology of delirium is extensive. The crucial difference between schizophrenia and delirium is the timing; signs and symptoms of schizophrenia generally develop over weeks to months, whereas delirium usually has a much more rapid onset. Because many medical illnesses can cause delirium, the diagnosis of new-onset schizophrenia should be made cautiously in patients who have an existing serious medical illness.

There also are racial disparities in the diagnosis of schizophrenia. For example, black persons are more likely than other racial groups to have symptoms attributed to schizophrenia,13 and Hispanics are more likely to be diagnosed with major depression when presenting with psychotic symptoms.14

A complete history chronicling the development of signs and symptoms is crucial when diagnosing schizophrenia. Because the patient may have altered perceptions, obtaining a comprehensive history from at least one family member or close friend is essential to provide another perspective of the disease course.

Drug Treatment
Effective pharmacologic treatment of schizophrenia has been available since the 1950s. In the early 1950s, the term "neuroleptic" was introduced to denote the effects of chlorpromazine (Thorazine; brand no longer available in the United States) and reserpine on laboratory animals. It was intended to distinguish their effects from those of sedatives and other central nervous system depressants.15 Although "neuroleptic" is still used synonymously with "antipsychotic," the term now usually refers to first-generation antipsychotics that confer an increased risk of extrapyramidal side effects, such as dystonic reactions (e.g., fixed upper gaze, neck twisting, facial muscle spasms), parkinsonian symptoms (e.g., rigidity, bradykinesia, shuffling gait, tremor), and akathisia (e.g., inability to sit still, restlessness, tapping of feet). Tardive dyskinesia, which is a chronic disorder of the nervous system characterized by involuntary jerking movements (primarily of the face, tongue, and jaw), often is considered an extrapyramidal side effect. However, it is actually a separate and mechanistically different phenomenon.

The term "atypical antipsychotic" refers to newer antipsychotics that confer less risk of extrapyramidal side effects than traditional antipsychotics. Table 4 lists antipsychotic agents currently available in the United States.

Nonadherence to medications is a significant problem; in a recent study, 74 percent of patients discontinued their medication within 18 months.16 Nonadherence often leads to relapse of symptoms. Atypical antipsychotics were initially thought to help with adherence because of their lower rate of neurologic side effects. However, meta-analyses have found that drop-out rates and relapse prevention are no better with atypical antipsychotics than with neuroleptics.17,18 Meta-analyses also have found that in terms of symptom scores and drop-out rates, atypical antipsychotics are better than high dosages (i.e., more than 12 mg per day) of haloperidol (Haldol); there was no advantage when the dosage of haloperidol was less than 12 mg per day.17 In other words, many of the perceived benefits of atypical antipsychotics actually were a result of the excessive doses of first-generation antipsychotics that were used for comparison in randomized trials.17

Evidence suggests that delays in initiating therapy with antipsychotics may result in a lifetime deleterious effect on psychotic episodes and social adjustment.19,20 If initiation of antipsychotic therapy is delayed because of limited psychiatric resources, family physicians should consider starting medications instead.

Adverse Effects
Prescribers should be aware of the potential adverse effects of antipsychotics and when the effects are likely to occur. The most concerning side effects of first-generation antipsychotics are neurologic (Table 515). The Abnormal Involuntary Movement Scale can be used to help monitor the development of involuntary movements associated with neurologic side effects.21

Although newer atypical antipsychotics are associated with fewer neurologic side effects, they confer a higher risk of metabolic side effects such as diabetes, hypercholesterolemia, and weight gain. The comparative risk of diabetes-related side effects of several of the most common antipsychotics (atypical and conventional) are shown in Table 6.22

Although atypical antipsychotics can cause weight gain, this effect is independent from the development of diabetes; the exact mechanism by which atypical agents might cause diabetes is unknown.22,23 In one retrospective cohort study of 3,015 patients comparing olanzapine (Zyprexa) with risperidone (Risperdal), both were associated with gaining weight in the first year but only olanzapine was shown to be associated with the development of diabetes.23 The diabetogenic potential of antipsychotics appears to be reversible if the medication is discontinued.

There have been no controlled trials on the effectiveness of long-term monitoring of biomedical markers (e.g., weight, blood sugar and cholesterol levels) in patients taking atypical antipsychotics, but the risk of metabolic side effects is high enough that regular monitoring is recommended by several consensus panels (Table 724).22,24 There are few or no data on the relative frequency that these tests should be performed, and no data to show that monitoring affects disease-specific or all-cause mortality rates.

Tardive dyskinesia is a common late side effect of prolonged treatment with antipsychotics. Stopping the causal antipsychotic does not diminish the chronicity and severity.25-28

To help manage side effects of drug treatment, family physicians should inquire about positive and negative symptoms at every patient visit, and they should regularly communicate with patients' mental health professionals about changes in symptoms, new lab results, and prescribing and monitoring roles.

Psychosocial Treatments
Individual, group, and family treatments have been developed as therapies for persons with schizophrenia. Family interventions include therapy with individual families, psychoeducation with groups of families, and family group therapy.29 These interventions offer support, education about the illness, and options for reducing critical and emotionally overinvolved attitudes and behaviors toward the patients.

Family treatments have the most empiric support for improving symptoms and reducing hospitalizations.30 These treatments are based on early findings that family environments that were high in "expressed emotion" (either critical and rejecting or emotionally overinvolved) were associated with relapse in patients with schizophrenia.31-34 Multiple studies have shown that family interventions reduce relapse rates and improve symptoms, adherence to medications, and functioning.30 However, a recent review suggested that there are weaknesses in many family intervention studies, and that there is a need for additional investigation.35

There are several psychosocial rehabilitative interventions that have been shown to be effective in improving the quality of life in patients with schizophrenia. The Intensive Psychiatric Rehabilitation Treatment, which is a program that teaches living, job, and social skills to patients, has resulted in improvements in functioning.36 Social skills training has improved independent living skills37-40; supported employment programs have shown improvements in the number of hours worked and total wages earned41; and in-home crisis intervention demonstrates promise by reducing treatment drop-out rates.42 Studies have shown that individual cognitive behavior therapy for schizophrenia reduces positive and negative symptoms,43 but currently there is no evidence that it reduces relapse rates.44

Understanding the potential course of disease can help guide treatment. Patients with schizophrenia have a high rate of substance abuse, and those with substance abuse have their first hospitalizations at earlier ages, have more frequent hospitalizations, and have more interpersonal and family discord.45 The strength of patients' commitment to their delusions is directly proportional to their likelihood of rehospitalization.46 Patients with poor executive functioning (i.e., skills involving problem solving, setting and attaining future goals, and decision making) use outpatient services at a higher rate and therefore may require increased support to maintain their independence.47

Patients with severe psychotic disturbances have a higher likelihood of aggressive behavior than those with fewer psychotic symptoms.48 Patients with schizophrenia also have a low marital rate and high divorce rate.49-52

Accelerated heart disease is the most common cause of death in patients with schizophrenia; the risk of dying from cardiovascular disease is two to three times higher than in the general population.22 This risk is accelerated because their rate of cigarette smoking is two to four times higher than that of the general population. Persons with schizophrenia also smoke more than patients with other mental disorders. In several studies, 90 percent of hospitalized patients with schizophrenia smoked.53,54 Nicotine has a possible positive effect on cognitive functioning in patients with schizophrenia, which may explain the high rate of smoking.53,55

Suicide also is a common cause of death in patients with schizophrenia; it has a 10 percent lifetime risk.2,56 The risk of suicide is strongly associated with depression, previous suicide attempts, drug abuse, agitation or motor restlessness, fear of mental disintegration, poor adherence to treatment, and recent loss.57 Overdose of treatment medications as a method of suicide is not common because antipsychotics have a high therapeutic index (i.e., lethal doses are much higher than the dosages that produce a therapeutic effect).

Note: Complete article including referenced tables is available in the attached Adobe Acrobat :acrobat: file.


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David Baxter

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