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The Correlation Between Depression
and Insomnia
Written By :
030.08.
FACULTY OF MEDICINE
TRISAKTI UNIVERSITY
JAKARTA, JUNE 2011
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ABSTRACT
Depression classifications include major depressive disorder (MDD), depression with
melancholic or catatonic features, atypical depression, and seasonal affective disorder
(SAD). In the primary care setting, where many of these patients first seek treatment,
the presenting complaints often can be somatic, such as fatigue, headache, abdominal
distress, or change in weight. (1)
The depressive syndrome is frequently accompanied by a group of vegetative
symptoms, such as decreased appetite or insomnia. Decreased appetite often leads to
some weight loss, although some depressed persons will force themselves to eat
despite decreased appetite, or they may be urged to eat by a parent or spouse so that
the weight loss is minimal. Less frequently, depression expresses itself as a desire to
eat excessively and is accompanied by weight gain. (2)
Insomnia may be initial, middle, or terminal. Initial insomnia means that the patient
has difficulty faliing asleep, often tossing or turning for several hours before dozing
off. Middle insomnia refers to awakening in the middle of the night, remaining awake
for an hour or two, and finally falling asleep again. Terminal insomnia refers to
awakening early in the morning and being unable to return to sleep.
Patients with insomnia will often worry and ruminate while they are lying awake.
Patients who have terminal insomnia may have more severe depressive syndromes.
Depressed patients also may complain of restless sleep, indicating that they have
awakened so frequently throughout the night that they scarcely got any sleep at all. (2)
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INTRODUCTION
A number of long-term demographic studies have indicated that there is alongitudinal relationship between insomnia and depression. For example, one study
showed that current insomnia carry a high likelihood of developing depression in the
future. National Institute of Mental Health (NIMH) Epidemiological Catchment Area
Study results, noted that, over a 1-year period, individuals who had no evidence of
psychiatric conditions other than insomnia at study outset were much more likely to
develop new major depression after 1 year when the insomnia persisted compared
with those in whom it resolved. These and similar studies have supported theories of a
causal link between insomnia and major depression, a link in the direction of the
former to the latter. Such theories have been supported by the high comorbidity of the
2 conditions and shared neurophysiological findings, such as cerebral cortical
hyperarousal.
The existence of a causal link between insomnia and depression raises the
intriguing question of whether effective management of insomnia could offer an
opportunity to prevent the future emergence of depressive disorders. Indeed, the
available data suggest that alternative explanations can also be made regarding the
link between insomnia and depression. For example, one of the longitudinal studies
cited above also shows that current insomnia enhances the risk not only for future
depression, but also for substance abuse and anxiety disorders. Another also indicates
that hypersomnia is even a stronger predictor of future depression than insomnia. (3)
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Chapter 1
DEPRESSION
Major depressive disorder is a common disorder, with a lifetime prevalence of
about 15 percent, perhaps as high as 25 percent for women. The incidence of major
depressive disorder is 10 percent in primary care patients and 15 percent in medical
inpatients. (4)
Common Causes of Depression(5)
If you're depressed, it might not be easy to figure out why. In most cases,
depression doesn't have a single cause. Instead, it results from a mix of things. Here
are a few of the things that can play a role in depression :
Biology. Studies show that certain parts of the brain don't seem to be
working normally. Depression might also be affected by changes in the
levels of certain chemicals in the brain, called neurotransmitters.
Genetics. Researchers know that if depression runs in your family, you have
a higher chance of becoming depressed.
Gender. Studies show that women are about twice as likely as men to
become depressed. The hormonal changes that women go through at
different times of their lives may be a factor.
Age. People who are elderly are at higher risk of depression. That can be
compounded by other factors (example : living alone and having a lack of
social support).
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Health conditions. Conditions such as cancer, heart disease, thyroid
problems, chronic pain, and many others increase your risk of becoming
depressed.
Changes and stressful events. It's not surprising that people might become
depressed during stressful times (such as during a divorce or while caring for
a sick relative) can sometimes trigger depression.
Medications and substances. Many prescription drugs can cause symptoms
of depression. Alcohol or substance abuse is common in depressed people. It
often makes their condition worse.
Physical Examination (6)
No physical findings are specific to major depressive disorder; instead, the
diagnosis is based on the history and the Mental Status Examination. Nevertheless, a
complete mental health evaluation should always include a medical evaluation to rule
out organic conditions that might imitate a depressive disorder.
Appearance and affect (6)
Most patients with major depressive disorder present to their physician with a
normal appearance. In patients with more severe symptoms, a decline in grooming
and hygiene can be observed, as well as a change in weight. Patients may show
psychomotor retardation, which manifests as a slowing or loss of spontaneous
movement and reactivity, as well as demonstrate a flattening or loss of reactivity in
the patient's affect. Psychomotor agitation or restlessness can also be observed in
some patients with major depressive disorder.
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Major Depressive Episode (6)
Criteria for the diagnosis of major depressive episode are laid out in the Diagnostic
and Statistical Manual of Mental Disorders, Fourth Edition, Text Revision (DSM-IV-
TR). A major depressive episode is defined as a syndrome in which at least 5 of the
following symptoms have been present during the same 2-week period :
Depressed mood (For children and adolescents, this can also be an irritable
mood.)
Diminished interest or loss of pleasure in almost all activities (anhedonia)
Significant weight change or appetite disturbance (For children, this can be
failure to achieve expected weight gain.)
Sleep disturbance (insomnia or hypersomnia)
Psychomotor agitation or retardation
Fatigue or loss of energy
Feelings of worthlessness
Diminished ability to think or concentrate; indecisiveness
Recurrent thoughts of death, suicidal
A pattern of long-standing interpersonal rejection ideation, suicide attempt,
or specific plan for suicide.
Depressive disorders can be rated as mild, moderate, or severe. The disorder
can also occur with or without psychotic symptoms, which can be mood congruent or
incongruent. Depressive disorders can be determined to be in full or partial remission.
When an episode lasts longer than 2 consecutive years, the depression should be
diagnosed as chronic.
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Chapter 2
INSOMNIA
Insomnia is a sleep disorder that is characterized by difficulty falling and/or
staying asleep. People with insomnia have one or more of the following symptoms: (7)
Difficulty falling asleep
Waking up often during the night and having trouble going back to sleep
Waking up too early in the morning
Feeling tired upon wakin g
Causes of Insomnia (7)
Significant life stress (job loss or change, death of a loved one, divorce,
moving).
Illness.
Emotional or physical discomfort.
Environmental factors like noise, light, or extreme temperatures (hot or
cold) that interfere with sleep.
Some medications (for example those used to treat colds, allergies,
depression ,high blood pressure, and asthma) may interfere with sleep. Interferences in normal sleep schedule (jet lag or switching from a day to
night shift, for example).
Physical Examination (8)
The physical examination may be helpful because findings may offer clues to
underlying medical disorders that predispose the patient to insomnia.
http://www.webmd.com/sleep-disorders/guide/insomnia-symptoms-and-causeshttp://www.webmd.com/sleep-disorders/default.htmhttp://www.webmd.com/balance/stress-management/http://children.webmd.com/kids-coping-divorcehttp://www.webmd.com/allergies/default.htmhttp://www.webmd.com/hypertension-high-blood-pressure/default.htmhttp://www.webmd.com/hypertension-high-blood-pressure/default.htmhttp://www.webmd.com/allergies/default.htmhttp://children.webmd.com/kids-coping-divorcehttp://www.webmd.com/balance/stress-management/http://www.webmd.com/sleep-disorders/default.htmhttp://www.webmd.com/sleep-disorders/guide/insomnia-symptoms-and-causes -
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If the history suggests sleep apnea, perform a careful head and neck
examination. Common anatomic features associated with obstructive sleep
apnea/hypopnea syndrome include the following:
Large neck size (18 inches or greater in males)
Enlarged tonsils
Mallampati airway score of 3 or 4.
Low-lying soft palate, particularly in patients with hypertension or cardiac
disease
Other features include enlarged tongue, retrognathia, micrognathia, or a steep
mandibular angle. An elevated body mass index (BMI) of 30 kg/m 2 or higher is also
common.
If the patient reports symptoms of restless legs syndrome or any other
neurologic disorder, perform a careful neurologic examination.
If the patient reports daytime symptoms consistent with any of the medical
causes of insomnia, a careful examination of the affected organ system (eg, lungs in
chronic obstructive pulmonary disease) may be helpful.
Diagnosing Insomnia (7)
If you think you have insomnia, talk to your health care provider. An
evaluation may include a physical exam, a medical history, and a sleep history. You
may be asked to keep a sleep diary for a week or two, keeping track of your sleep
patterns and how you feel during the day. Your health care provider may want to
interview your bed partner about the quantity and quality of your sleep. In some
cases, you may be referred to a sleep center for special tests.
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Chapter 3
Depression and Insomnia
Most chronic psychiatric disorders are associated with sleep disturbances.
Depression is most commonly associated with early morning awakenings and an
inability to fall back asleep. Conversely, studies have also demonstrated that insomnia
can lead to depression: insomnia of more than 1-year duration is associated with an
increased risk of depression. (9)
Insomnia and depression often go hand-in-hand. Although just 15% of people
with depression sleep too much, as many as 80% have trouble falling asleep or
staying asleep. Patients with persistent insomnia are more than three times more likely
to develop depression.
The relationship between insomnia and depression is far from simple,
however. Until recently, insomnia was typically seen as a symptom of depression, but
new research shows that insomnia is not just a symptom of depression. Insomnia and
depression are two distinct but overlapping disorders. Research shows that by treating
both simultaneously, doctors have a better shot at improving a patients sleep quality,
mood, and overall quality of life. (10)
It can be difficult to distinguish between the occurrence of primary insomnia
or insomnia as a symptom of an underlying psychiatric disorder. Insomnia has been
demonstrated to be a risk factor for major depressive disorder (MDD), dysthymic
disorder, and bipolar disorder. One sleep survey found that more than 40% of patients
reported symptoms of insomnia before the development of a mood disorder. Another
study found that unresolved insomnia increases the odds of developing a new
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psychiatric disorder over the course of 1 year. Some evidence has demonstrated that
treating the underlying symptoms of insomnia may provide beneficial effects toward
reducing or preventing depression. Thus, it is tempting to predict that aggressive
treatment of insomnia could, in some cases, help prevent the occurrence of depressive
disorders. However, this would require additional study because other data have
suggested that the use of hypnotics themselves may contribute to the incidence of
insomnia. (11)
Can Insomnia Trigger Depression? (10)
Its easy to understand how insomnia might be linked to depression. Chronic
sleep loss can lead to a loss of pleasure in life, one of the hallmarks of depression,
explains Stanford University research psychologist Tracy Kuo, PhD. When people
cant sleep , they often become anxious about not sleeping. Anxiety increases the
potential for becoming depressed.
Indeed, recent findings show that insomnia often shows up before a bout of
depression strikes, serving as a useful warning sign. A worsening of insomnia can
also signal depression.
But the relationship is far more than simply cause and effect. When depressed
people suffer from insomnia, their risk of recurring depression is greater than that of
pat ients who dont have insomnia. So, insomnia may serve as a trigger for depression,
but it also appears to perpetuate depression.
How Insomnia Treatment Can Ease Depression (10)
The latest findings have helped improve treatment strategies. Evidence shows
that treating sleep problems can ease depressive symptoms and may even prevent
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relapses. In one study, 56 people who suffered both depression and insomnia received
psychotherapy for their sleep problems alone. The symptoms of depression eased in
more than half of the people, even though their treatment had not targeted depression.
Another study, with 545 patients, found that depressed patients with insomnia
who were treated with both an antidepressant and a sleep medication fared better than
those treated only with antidepressants. The people treated for both insomnia and
depression slept better and their depression scores improved significantly more than
patients on antidepressants alone.
Both of these studies offer strong evidence for why its so important to treat
insomnia, whether its associated with depressi on, chronic pain, cancer, or other co-
existing disorders, Perlis tells WebMD.
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CONCLUSSION
A complex relationship exists between insomnia and depressive disorders.
Increased emphasis should be placed on treating insomnia in depression because it is
a risk factor for depression. Insomnia also plays an important role in the course and
severity of the depressive episode, and persistent insomnia is a risk factor for
depressive relapse. Treatment strategies should address both depressive symptoms
and insomnia and should consider use of both pharmacologic and nonpharmacologic
strategies.
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BIBLIOGRAPHY
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