|
May
2016
- Volume 10, Issue 2
Electroconvulsive Therapy Use Among Depressive Inpatients:
Position Statement
(
|
Moawia Eid
Correspondence:
Moawia Eid,
RN, MSN, CNS.
Jordan Ministry of Health
New Zarqa Gov Hospital
Mobile: 00962788824237
Email: moawia_eed@yahoo.com
|
 |
Abstract
Introduction: Major Depressive Disorder is one
of the most common mental health problems around the
world; while Electroconvulsive Therapy is one of the
most common methods for treating the disorder; it has
a correlated effect over patients with depression.
Purpose: The purpose of this paper is to provide
a position statement by the current author about using
ECT treatment modalities among major depressive patients,
especially those who are unresponsive to psychotropic
drugs and psychotherapies.
Methods: Search strategies included database of Pub
Med, Google Scholar, and American Psychiatric Association;
they provided many studies about the current topic using
some words such as Depression, Electroconvulsive Therapy,
Unresponsive, Benefits and Risks.
Results: The current (as position statement)
author supports the use of Electroconvulsive Therapy
among major depressive patients especially those who
are treatment resistant to other treatment modalities
to enhance psychiatric symptoms and illness relief.
Conclusion: Electroconvulsive therapy is considered
an effective treatment modality of patients with major
depression especially with severe cases and unresponsive
to other treatments modalities. Although it has side
effects such as being as life threatening for very strict
cases, that can be prevented by holistic medical assessment
and care.
|
Introduction
Mental health problems were international challenges
that have a significant contribution in illness burden over
the entire world (Blake, 2012). Major Depressive Disorder
(MDD) was one of the common health problems and it was estimated
to affect 121 million adults worldwide (World Health Organization,
2012). However, Electroconvulsive Therapy, ECT, was one of
the most common methods for treating major depression safely
and effectively (Keltner & Boschini, 2009). American Nurses
Association, APA, (2014) defined the position statement as
an explanation, a justification or a recommendation for a
course of action that reflects the author's stance according
to literature review regarding the concern.
MDD, can be defined as a period of at least two weeks during
which there is either depressed mood or the loss of interest
or pleasure in nearly all activities (APA, 2000). MDD was
associated with significant morbidity, mortality, and disability
that burdens the individual and his/ her family, and contributes
to impaired cognitive skills and deterioration of the individual
life aspects (Blake, 2012; Nahas & Sheikh, 2011). Symptoms
of depression included feeling of hopelessness and helplessness,
loss of energy, anhedonia, agitation, fatigue, withdrawn,
weight loss or gain, fatigue, and inappropriate thinking (Townsend,
2011).
Treatment modalities of this disorder were stated on severity
which was mild, moderate and severe, that included psychotherapy,
psychopharmacology and ECT for severe phases (Tusaie &
Fitzpatrick, 2013). Electroconvulsive Therapy, defined as
the safe induction of a series of generalized epileptic seizures
for therapeutic purposes, using brief pulse stimulation techniques
under anesthesia and muscle paralysis (Baghai & Möller,
2008).
The purpose of this paper is to provide a position statement
by the current author about using ECT treatment modalities
among major depressive patients, especially those who are
unresponsive to psychotropic drugs and psychotherapies.
The paper will be organized as Background about ECT with positive
and negative issues, position statement of current author
about ECT with suggested actions that are integrated with
National Center for Mental Health, NCMH, of recommendation
and possible solutions for ECT use, summary and conclusion
and finally acknowledgment and references.
Background
The purpose of literature review is to identify proponent
and opponent studies of ECT in terms of effectiveness, benefits
and co-morbidity, side effects and contraindications and social
concerns and cost effectiveness of ECT.
ECT is one of the oldest biological treatments for psychopathology.
It was introduced as somatic therapy since 1938 (O'Reardon,
Cristancho, Ryley, Patel & Haber, 2011). It was used in
treating MDD and other psychiatric illness su as Schizophreniform
disorder or schizoaffective disorder and mania (Tess&
Smetana, 2009). ECT was used as first line therapy in major
depression, bipolar depression, bipolar mania, positive schizophrenia,
postpartum psychosis, various movement
disorders and is immediately required in suicidal, catatonia
and assaultive behaviors (Keltner& Boschini, 2009). Although
it has different adverse events and risks which must not be
ignored such as somatic pain, cognitive side effects and medical
contraindications (Baghai& Möller, 2008).
Proponent Studies
Effectiveness. In a randomized control study, the remission
rate of ECT users among unipolar and bipolar depression patients
was more than 60% in comparison with drugs modalities group
(Bailine et al., 2010). Depressive patients who are treatment-resistant
on drugs and severe cases were well treated by ECT as evidenced
by more than 24 studies with RCT and case reports (Little,
2009). There was evidence that bilateral electroconvulsive
therapy improved symptoms more than unilateral therapy, and
that high dose therapy was more effective than low dose therapy
(Al-Harbi, 2012; Bailine et al., 2010; Little, 2009). Additionally,
at experimental study of more than 900 participants of depressive
patients that, showed response rate of ECT from eight to twelve
sessions two to three times weekly, results were presented
that a response rate of 81% especially among older adults,
authors concluded that older patients, more severely ill patients,
psychotically ill patients and patients without personality
disorders had the highest responder rates on short term ECT
(Nordenskjöld, Knorring & Engström, 2012).
Positively, on systematic chart review of a study with 42
participants who were diagnosed with MDD, response rate was
85.7% (36/42), and the study noted that ECT as longterm therapy
was recommended for older ages than others and among those
who complained of treatment resistant depression Furthermore
the procedure assisted in decreasing relapse for recurrent
relapsed patients in addition to psychotropic drugs as Sertraline
or Mirtazapine (Tokutsu et al., 2013). It is effective more
rapidly than other psychotherapy agents especially for severe
cases and resistant cases (Cusin & Dougherty, 2012) and
with response rates as high as 95% for patients with MDD with
psychotic features with recommended six to twelve sessions
(Tirmizi, Raza, Trevino & Husain, 2012). Moreover, as
a literature review study of more than 50 studies, continuous
and maintenance ECT had valuable treatment modalities to prevent
relapse and recurrence of mood disorders, especially MDD (Petrides,
Tobias, Kellner & Rudorfer, 2011).
Benefits and co-morbidity. ECT had beneficence on treatment
of co-morbidity of illness, which means co-occurrence of two
or more disorders in a specified period (Tusaie& Fitzpatrick,
2013). On case report study of a woman complaining of anorexia
nervosa and co-morbid severe major depressive disorder, was
treated with ECT and developed a positive effect on the depressive
symptoms and had some positive effect on weight gain (Poutanen,
Huuhka & Perko, 2009). While another case report study
of three cases co-occurred with Obsessive- Compulsive Disorder;
the result showed that the patients' depressive symptoms improved
after the ECT procedures beside improvement of the condition
of all three OCD patients OCD significantly (Liu et al., 2014).
It provided effective removal of psychomotor inhibition, appetite
loss, and delusions for a case with fronto temporal dementia
(Kobayashi, Inoue, Shioda & Kato, 2012). Additionally,
ECT as maintenance therapy provided a safe and efficacious
option in epileptic patients with major depressive disorder
without increasing of seizure threshold (Kucia, Stepanczak
& Tredzbor, 2009).
Regarding medical conditions, it was applicable to a case
of older adult with aortic stenosis but with strict observation
and follow up of multidisciplinary team (O'Reardon et al.,
2011). Moreover, post stroke depression was treated in some
cases by ECT with efficient outcome but with holistic monitoring
for avoiding unexpected outcomes (Lökk & Delbari,
2010). Furthermore, ECT was an effective, safe, and useful
procedure in the treatment of catatonic youngsters as reported
in 59 patients (Consoli et al., 2010).
Social concerns and cost effectiveness. Socially, ECT
was more acceptable among treatment resistant cases and postpartum
reports due to its short term and quick resolving of depressive
symptoms (Keltner& Boschini, 2009). Costly, ECT was less
expensive in comparison to new psychotropic agents such as
Zoloft or Prozac due to their selectivity but its adverse
effects required additional therapy (Eitan & Lerer, 2006;
Zimovetz, Wolowacz, Classi & Birt, 2012). Moreover, other
psychotherapy required more sessions and combinations with
other psychotropic drugs for achieving benefits while ECT
achieved it as monotherapy (Zimovetz et al., 2012).
According to the policy of NCMH (2011) for ECT use, they considered
the ECT as somatic therapy that nursing staff supported and
participated in providing electroconvulsive therapy, in addition
to maintaining the patient's safety and rights as critical
to the somatic therapies; the patient's medical record contained
data on these treatments. So, the current author'a position
statement will be shaped and adopted according to this policy
and procedures.
Opponent Studies
Effectiveness. In contrast, among 28 participants in
randomized control trials for fa our week period, Isoflurane
as anesthesia agent of 10 sessions had an antidepressant effect
approaching ECT with less adverse neuro-cognitive effects
in comparison to the ECT group with eight to twelve sessions.
The last were complicated with decline of memory and daily
activities in 90% (Weeks et al., 2013). Moreover, in a retrospective
descriptive study of 27 participants chart review for three
years under continuous treatment of ECT as mono-therapy, the
re-hospitalization rate was 43% in the first 6 months and
increased to 58% within two years due to relapse of symptoms
(Nordenskjöld, Knorring& Engström, 2011).
Additionally, a case report study, disagreed with electroconvulsive
therapy because ineffective assessment and evaluation presented
ECT induced mania as electrical effect of therapy which added
more bulk in the treatment strategy (Saatcioglu & Guduk,
2009). Moreover, relapse rate was common after ECT in 50%
within 6 months, which was treated effectively with antidepressants
such as venlafaxine to prolong the remission period (Prudic
et al., 2013). In addition, ECT adverse effects were uncontrollable
in many patients, such as memory loss, seizure and severe
headache (Nordenskjöld et al., 2011). Magnetic Seizure
Therapy, MST, which induced seizure to brain regions with
less voltage than ECT and less adverse effects for producing
unpleasant seizure, additionally was more effective than ECT
due to its locality and selectivity (Deng, Lisanby & Peterchev,
2011).
Side effects and contraindications. Most cases treated
by ECT reported more than one side effect summarized as headache,
nausea, vomiting, memory loss which can last for one month,
scalp pain and in some cases fractures that added special
concerns for considering ECT (Baghai& Möller, 2008).
Case report study of monozygotic twins who were treated with
ECT reported prolonged apnea due to anesthesia procedure of
ECT that increased suspicion about using ECT as effective
therapy (Zavorotnyy & Zwanzger, 2011). Moreover, Electrocardiogram
changes during ECT session indicated increasing pulmonary
odema (Manne, Kasirye, Epperla & Garcia-Montilla, 2012).
On the other hand, pre ECT procedure required full physical
and mental assessment due to its precautions on multiple cases
as increasing intracranial pressure or tumor, myocardial infarction,
heart valve abnormalities, severe liver diseases, severe pulmonary
diseases, intra cerebral vascular malformations, osteoporosis,
esophageal hernia and others (Baghai& Möller, 2008).
Social and cost effective. Socially, the current adverse
effects and media roles, decreased adherence to this therapy
with increasing contact with other therapies (Payne& Prudic,
2009). Moreover, health care providers decreased ECT use as
therapy due to its full preparation to procedure and long
follow up post treatment (Martin & Elworthy, 2013). Costly,
post ECT care for treating complications in severe cases was
more expensive than usual psychotropic medications with psychotherapy
(Read & Bentall, 2010). Moreover, family psycho education
as preventive measurement for relapse prevention was more
cost effective than recurrent ECT sessions as presented in
a randomized control trial (Shimodera et al., 2012).
Summary
ECT is considered as effective therapy for many psychiatric
illnesses, especially MDD and treatment resistant depression;
on te other hand it increases enhancement in co morbid situations
such as OCD, anorexia and epilepsy. Moreover, it is safe for
the different medical disorders such as aortic stenosis or
stroke. Additionally ECT users are more adherent than others
to its feasibility and short term sessions and cost effectiveness.
On other hand, the ECT doesn't play an active role in preventing
re-admissions and relapsing in different situations because
it requires maintenance and follow up sessions to be useful
therapy. Most common side effects are nausea, vomiting, headache,
memory loss and localized pain and other side effects are
due to special medical conditions. Moreover strict medical
and physical assessment is required for avoiding unexpected
outcomes.
Position Statement
The current author supports the use of Electroconvulsive Therapy
among major depressive patients especially those who are treatment
resistant to other treatment modalities to enhance psychiatric
symptoms and illness relief. Moreover, it is strongly recommended
for use among patients who have high suicidal, catatonic or
assaultive behaviors. It must be used under systematic health
care process. The current author recommends for the following
practices:
Nurses must prepare all equipment for ECT session considering
first aid and septic considerations that include: oxygen supply,
suction, face mask, items of monitor and electrocardiogram,
cuff pressure and stethoscope, ECT items, normal saline alcohol
swabs and items of anesthesia.
Regarding session preparation:
1- ECT requires physician order with pretreatment orders
2- Patient must have a complete physical with all lab
test results returned.
3- The physician obtains the informed consent and the
primary nurse needs to reinforce the information given the
patient and family when questions arise.
4- Patient is NPO at midnight the evening before a
treatment. Prior to taking the patient to the treatment room,
the nurse must check a patient for voiding and remove dentures,
contact lenses, all jewellery and nail polish.
5- Check the patient's medical record is complete and
including a signed permission; and gives the patient pretreatment
medication as ordered.
During session, primary nurse can stay with patient;
nurse takes vital signs and monitors the ECG rhythm and the
other one supports patient's jaw and extremities.
After session, vital signs and patient's response must
be monitored; return the patient to hospital room to recover
with upside rails and feeding on full alert status; keep safe.
The current author also recommends the following future
directions:
o Enhancing family and patient's information about
effectiveness and importance of ECT as somatic therapy.
o Considering patient's financial cover for assurance
of complete sessions of ECT or other treatment modalities
if possible.
o Encourage decision makers and stockholders to establish
national and international agencies about ECT use and benefits
to enhance social perceptions.
o Encourage authority holders to affect the media about
ECT concerns to modify the negative social impression and
stigma about ECT.
o Articulating standardized application of ECT among
psychiatric patients to assure appropriate use and achieve
planned outcomes.
o Activating the researchers' role in this field to
enhance practices and skills of ECT procedure and changing
that according to evidence based outcomes.
o Encouraging educational programs to enhance training
and knowledge about ECT as therapy among nursing staff, physicians
and other health care providers to ensure high quality of
care in this field.
o Empowering the importance of interdisciplinary team
as health care providers to assure increasing benefits and
decreasing risks.
Summary and Conclusion
The purpose of this paper was to state a position about the
using of ECT among MDD as somatic therapy. The current author
supports the use of ECT as therapy for depressive patients
especially those who are unresponsive to other modalities
of treatment. It produces effective outcomes on decreasing
relapses and enhancing of remission from disorders. It could
be first line therapy in severe depressive cases with high
lethality or catatonic cases and second line for those unresponsive
to other psychotropic medications and psychotherapy.
Even though it has various side effects starting from localized
pain ranging to memory loss and ending in death in some cases,
it plays an active role in treating severe depressive episodes
and co morbid disorders such as eating disorders, OCD, epilepsy
and is safe on many medical conditions as stork , aortic stenosis
and others. On other hand, high risk patients can be detected
through holistic medical and physical assessment to avoid
unpleasant outcomes, to achieve the major goal of psychiatric
treatment, of health enhancement.
Acknowledgments
The current author offers special thanks for Professor Dr.
Majd Mrayyan PhD, RN for her direct supervision and supporting
for succession of this paper. Also the current author acknowledges
support of other instructors on Hashemite University on nursing
faculty especially on psychiatric and mental health department.
References
Al-Harbi, K. (2012). Treatment-Resistant Depression: Therapeutic
Trends, Challenges, and Future Directions. Patient Preference
and Adherence, 6, 369-388. Retrieved from: http://dx.doi.org/10.2147/PPA.S29716
American Psychiatric Association. (2000). Diagnostic and statistical
manual of mental disorder DSM-IV-TR. (4th Ed.). Washington,
DC: Street, NW, Washington, DC.
American Nurses Association. (2014). Position statement definition.
Retrieved from: http://www.nursingworld.org/positionstatements
Baghai, T., & Möller, H. (2008). Electroconvulsive
Therapy and its Different Indications. Dialogues Clinical
Neuroscience, 10, 105-117.
Bailine, S., Fink, M., Knapp, R., Petrides, G., Husain, M.,
Rasmussen, K., Kellner CH. (2010). Electroconvulsive Therapy
is Equally Effective in Unipolar and Bipolar Depression. Acta
Psychiatric Scandinavia, 121, 431-436. DOI: 10.1111/j.1600-0447.2009.01493.x
Blake, H. (2012). Physical activity and exercise in the treatment
of depression. Frontier Psychiatrist, 106(3), 343-352.
Consoli, A., Benmiloud, M., Wachtel, L., Dhossche, D., Cohen,
D., & Bonnot, O. (2010). Electroconvulsive Therapy in
Adolescents With the Catatonia Syndrome. J ECT, 26, 259-265.
DOI: 10.1097/YCT.0b013e3181fb3924
Cusin, C., & Dougherty, D. (2012). Somatic Therapies for
Treatment-Resistant Depression: ECT, TMS, VNS, DBS. Biology
of Mood & Anxiety Disorders, 2(14), 1-9. Retrieved from:
http://www.biolmoodanxietydisord.com/content/2/1/14
Deng, Z., Lisanby, S., & Peterchev, A. (2011). Electric
Field Strength and Focality in Electroconvulsive Therapy and
Magnetic Seizure Therapy: A Finite Element Simulation Study.
J Neural Eng, 8(1), 016007. DOI: 10.1088/1741-2560/8/1/016007
Eitan, R., & Lerer, B. (2006). Nonpharmacological, Somatic
Treatments of Depression: Electroconvulsive Therapy and Novel
Brain Stimulation Modalities. Dialogues Clinical Neuroscience,
8, 241-258.
Keltner, N., & Boschini. D. (2009). Electroconvulsive
Therapy. Perspectives in Psychiatric Care, 45(1), 66-72.
Kobayashi, T., Inoue, K., Shioda, K., & Kato, S. (2012).
Effectiveness of Electroconvulsive Therapy for Depression
and Cotard's Syndromeina Patient with Frontotemporal Lobe
Dementia. Case Reports in Psychiatry, 2012, 627460. DOI: 10.1155/2012/627460
Kucia, K., Stepanczak, R., & Tredzbor, B. (2009). Electroconvulsive
Therapy for Major Depression in an Elderly Person with Epilepsy.
The World Journal of Biological Psychiatry, 10(1), 78-80.
Little, A. (2009). Treatment-Resistant Depression. American
Family Physician, 80(2), 167-172.
Liu, X., Cui, H., Wei, Q., Wang, Y., Wang, K., Wang, C.,
Xie, X. (2014). Electroconvulsive Therapy on Severe Obsessive-Compulsive
Disorder Comorbid Depressive Symptoms. Psychiatry Investigation,
11(2), 210-213. Retrieved from: http://dx.doi.org/10.4306/pi.2014.11.2.210
Lökk, J., & Delbari, A. (2010). Management of Depression
in Elderly Stroke Patients. Neuropsychiatric Disease and Treatment,
2010(6), 539-549. DOI: 10.2147/NDT.S7637
Manne, J., Kasirye, Y., Epperla, N., & Garcia-Montilla,
R. (2012). Non-Cardiogenic Pulmonary Edema Complicating Electroconvulsive
Therapy: Short Review of the Pathophysiology and Diagnostic
Approach. Clinical Medicine& Research, 10(3), 131-136.
Martin, F., & Elworthy, T. (2013). Scottish Psychiatrists'
Attitudes to Electroconvulsive Therapy: Survey Analysis. The
Psychiatrist, 37, 261-266. DOI: 10.1192/pb.bp.112.039479
Nahas, R., & Sheikh, O. (2011). Complementary and alternative
medicine for the treatment of major depressive disorder. Canadian
Family Physician, 57(1).
National Center for Mental Health (2011). All Policies and
Procedures, Nursing care / Intervention: Somatic Therapy.
Page: 54; Pp. 149-151.
Nordenskjöld, A., Knorring, L., & Engström,
I. (2011). Rehospitalization Rate after Continued Electroconvulsive
Therapy- A retrospective Chart Review of Patients with Severe
Depression. Nord J Psychiatry, 65, 26-31. DOI: 10.3109/08039488.2010.485327
Nordenskjöld, A., Knorring, L., & Engström,
I. (2012). Predictors of the Short-Term Responder Rate of
Electroconvulsive Therapy in Depressive Disorders - A Population
Based Study. BMC Psychiatry, 12(115), 1-7.
O'Reardon, J., Cristancho, M., Ryley, B., Patel, K., &
Haber, H. (2011). Electroconvulsive Therapy for Treatment
of Major Depression in a 100-Year-Old Patient with Severe
Aortic Stenosis: A 5-year Follow-up Report. J ECT, 27(3),
227-230. DOI: 10.1097/YCT.0b013e3182293a1c
Payne, N., & Prudic, J. (2009). Electroconvulsive Therapy
Part II: A Biopsychosocial Perspective. J Psychiatric Practice,
15(5), 369-390. DOI: 10.1097/01.pra.0000361278.73092.85
Petrides, G., Tobias, K., Kellner, C., & Rudorfer, M.
(2011). Continuation and Maintenance Electroconvulsive Therapy
for Mood Disorders: Review of the Literature. Neuropsychobiology,
64, 129-140. DOI: 10.1159/000328943
Poutanen, O., Huuhka, K., & Perko, K. (2009). Severe Anorexia
Nervosa, Co-occurring Major Depressive Disorder and Electroconvulsive
Therapy as Maintenance Treatment: A Case Report. Cases Journal,
2, 9362 . DOI: 10.1186/1757-1626-2-9362
Prudic, J., Haskett, R., McCall, V., Isenberg, K., Cooper,
T., Rosenquist, P.,
Sackeim, H. (2013). Pharmacological
Strategies in the Prevention of Relapse Following Electroconvulsive
Therapy. J ECT, 29(1), 3-12. doi:10.1097/YCT.0b013e31826ea8c4
Read, J., & Bentall, R. (2010). The Effectiveness of Electroconvulsive
Therapy: A Literature Review. Epidemiology and Psychiatric
Social, 19, (4),333- 347.
Saatcioglu, O., & Guduk, M. (2009). Electroconvulsive
Therapy-Induced Mania: A Case Report. Journal of Medical Case
Reports, 3, 94. DOI: 10.1186/1752-1947-3-94
Shimodera, S., Furukawa, T., Mino, Y., Shimazu, K., Nishida,
A., & Inoue, S. (2012). Cost-Effectiveness of Family Psychoeducation
to Prevent Relapse in Major Depression: Results from A Randomized
Controlled Trial. BMC Psychiatry, 12(40), 16-21.
Tess, A., & Smetana, G. (2009). Medical Evaluation of
Patients Undergoing Electroconvulsive Therapy. New England
Journal of Medicine, 360, 1437-1444.
Tirmizi, O., Raza, A., Trevino, K., & Husain, M. (2012).
Electroconvulsive Therapy: How Modern Techniques Improve Patient
Outcomes: Refinements have Decreased Memory Loss, Other Adverse
Effects While Retaining Efficacy. Current Psychiatry, 11(10),
24-46.
Tokutsu, Y., Nakano, W., Shinkai, T., Yoshimura, R., Okamoto,
T., Katsuki, A., Nakamura, J. (2013). Follow-up Study on Electroconvulsive
Therapy in Treatment-resistant Depressed Patients after Remission:
A Chart Review. Clinical Psychopharmacology and Neuroscience,
11(1), 34-38. Retrieved from: http://dx.doi.org/10.9758/cpn.2013.11.1.34
Townsend, M. (2011). Essential of Psychiatric Mental Health
Nursing: Concepts of care in evidence-based practice. (5th
Ed.) F.A Davis. Philadelphia.
Tusaie, K. R., & Fitzpatrick, J. J. (2013). Advanced Practice
Psychiatric Nursing. Springer Publishing Company, New York,
NY.
Weeks, H.R., Tadler, S.C., Smith, K.W., Iacob, E., Saccoman,
M., White, A., Light, K.C. (2013). Antidepressant and Neurocognitive
Effects of Isoflurane Anesthesia versus Electroconvulsive
Therapy in Refractory Depression. PLoS ONE, 8(7), e69809.
DOI:10.1371/journal.pone.006980
World Health Organization. (2012). Global burden of disease
report. Disease prevalence and disability. Geneva: WHO; Retrieved
from www.who.int/mediacentre/events/2012/wha65/journal/en/index4.html
Zavorotnyy, M., & Zwanzger, P. (2011). Prolonged Apnea
During Electroconvulsive Therapy in Monozygotic Twins: Case
Reports. Annals of General Psychiatry, 10(30), 1-2. Retrieved
from: http://www.annals-general-psychiatry.com/content/10/1/30
Zimovetz, E., Wolowacz, S., Classi, P., & Birt, J. (2012).
Methodologies Used in Cost- Effectiveness Models for Evaluating
Treatments in Major Depressive Disorder: A systematic Review.
Cost Effectiveness and Resource Allocation,10(1), 1-18. Retrieved
from: http://www.resource-allocation.com/content/10/1/1
|
 |