Modified leucotomy assessed clinically, physiologically and psychologically at six weeks and eighteen months

Neurosurgical treatments of depression

The neurosurgical treatment of treatment-resistant depression (TRD) has entered a new era with more and more patients being treated with deep brain stimulation (DBS) via surgically implanted intracerebral electrodes. Although the mechanisms of action of DBS are still not fully understood, preclinical studies are being conducted to elucidate how the treatment might work. DBS in its present form can be considered as a relatively new neurosurgical treatment for TRD. However, the use of neurosurgery in the management of depression has a much longer history particularly with ablative procedures but also vagal nerve stimulation. Here, we provide a review of the clinical neurosurgical treatments for TRD, with a main emphasis on DBS. In addition, we discuss relevant preclinical data that are revealing new information about DBS mechanisms.

Neurostimulatory and ablative treatment options in major depressive disorder: a systematic review

INTRODUCTION

Major depressive disorder is one of the most disabling and common diagnoses amongst psychiatric disorders, with a current worldwide prevalence of 5-10% of the general population and up to 20-25% for the lifetime period.

HISTORICAL PERSPECTIVE

Nowadays, conventional treatment includes psychotherapy and pharmacotherapy; however, more than 60% of the treated patients respond unsatisfactorily, and almost one fifth becomes refractory to these therapies at long-term follow-up.

NONPHARMACOLOGICAL TECHNIQUES

Growing social incapacity and economic burdens make the medical community strive for better therapies, with fewer complications. Various nonpharmacological techniques like electroconvulsive therapy, vagus nerve stimulation, transcranial magnetic stimulation, lesion surgery, and deep brain stimulation have been developed for this purpose.

DISCUSSION

We reviewed the literature from the beginning of the twentieth century until July 2009 and described the early clinical effects and main reported complications of these methods.

Obsessive-compulsive disorder. How primary care physicians can help

Obsessive-compulsive disorder is common but not always recognized and treated. Obsessions are recurrent undesirable thoughts or images; compulsions are recurrent undesirable actions. Behavior psychotherapy can be very helpful in controlling compulsions, whereas clomipramine (Anafranil) or fluoxetine (Prozac) therapy can relieve both obsessions and compulsions. Given an understanding of the disorder and its treatment, primary care physicians can, in most cases, effectively diagnose and manage this debilitating condition. Those who do not wish to initiate treatment should refer patients to a mental health professional, as should those who attempt treatment but meet with an unresponsive case.

The use of intravenous chlorimipramine in the treatment of obsessive compulsive disorder

Obsessional disorder has always remained a difficult illness for psychiatrists to treat with response to therapy, both psychotherapy and chemotherapy, being low. A review of the traditional approaches to the treatment of obsessional disorder is done, including a brief review of the literature on intravenous chlorimipramine. Five case histories of patients with previously non-responsive obsessional disorder are summarized. All five cases were treated in hospital with a series of infusions of intravenous chlorimipramine. The drug and route of administration was extremely well tolerated with rapid and dramatic relief of obsessional symptoms as well as improvement of mood in all cases. The theoretical action of chlorimipramine is discussed as well as possible reasons why the intravenous route appears to be superior to the oral form.

Stereotactic limbic leucotomy--a follow-up at 16 months

Sixty-six patients were assessed clinically, psychologically and physiologically before operation, at six weeks and at a mean of 16 months following stereotactic limbic leucotomy. Seventy-three per cent were clinically improved at six weeks and 76 per cent at 16 months. In obsessional neurosis, 89 per cent of patients showed definite clinical improvement at 16 months; in chronic anxiety, 66 per cent were improved; in depression, 78 per cent; and in the small number of schizophrenics treated the improvement rate was over 80 per cent. Self-assessment and observer-assessment questionaires and scales measuring Depression, Anxiety, Neuroticism, Hysterical symptoms and Obsessional symptoms and traits all showed highly significant reductions of mean scores at 16 months. There was no fall-off in intelligence, and adverse effects were minimal. Limbic leucotomy, with its enhanced accuracy and safety, compares very favourably with similarly assessed, more extensive 'free-hand' procedures, and in obsessional neurosis and chronic anxiety the results are superior.

Psychosurgery and the limbic system

The limbic system can be considered to consist of a central ‘core’ from which three well-defined circuits emerge. These are the Papez or medial circuit, the basolateral circuit and the defence reaction circuit. The functions of the primitive limbic brain are modulated by a higher order control—the frontal lobe. Emotional responses and physiological changes have been obtained by stimulation of fronto-limbic pathways and limbic circuits and these have been used for location of target sites in psychosurgery. For the relief of intractable depression and anxiety, lesions are generally made in the lower medial quadrant or posteroorbital part of the frontal lobe, where there is a concentration of fronto-limbic connections. In primary obsessional neurosis lesions at this site produce less satisfactory results, but these illnesses may be helped by lesions in the cingulate gyrus, which is part of the Papez circuit. Patients with epilepsy and aggressive outbursts may respond to temporal lobotomy, or to operations, such as amygdalotomy, where lesions are placed in the defence reaction circuit.

Stereotactic limbic leucotomy--a follow-up study of thirty patients

This prospective study reports the results of stereotactic limbic leucotomy at a mean of 17 months following surgery. Clinical improvement had occurred in twenty-four (80%) of the patients, fifteen (50%) of them being symptom free or much improved. Fourteen of sixteen patients suffering from obsessional neurosis were improved, as were five of seven with chronic anxiety and the degree of improvement at 17 months was superior to that at 6 weeks. Psychometric scores of anxiety, obsessions and neuroticism were all significantly reduced at 17 months. The mean depression scores were also significantly reduced and this result was superior to that reported in a previous study of ‘free-hand’ operations.

Adverse effects were not a problem following limbic leucotomy. Emotional blunting, disinhibition, post-operative epilepsy and excessive weight gain were not encountered, and intelligence was unaffected by the operation. Limbic leucotomy is a much more limited and precise procedure than older ‘free-hand’ operations which we have studied, but its therapeutic effects are comparable and in obsessional neurosis, superior.

Stereotactic limbic leucotomy: neurophysiological aspects and operative technique

Psychosurgery has always been, and is likely to remain, a controversial subject. Blind operations lack precision and can lead to adverse personality changes or other serious side-effects. Open surgery is becoming less acceptable because of the difficulties of accurately assessing the extent of a lesion and its exact location. The introduction of stereotactic techniques enables far smaller lesions to be placed with a high degree of accuracy, and increased knowledge of the limbic system has contributed to advances in this field.

Stereotactic limbic leucotomy: a preliminary report on forty patients

The neurophysiological aspects and operative technique of stereotactic limbic leucotomy have been described in a previous paper (Kelly, Richardson and Mitchell-Heggs, 1973). The present investigation is a prospective study designed to assess the results of such surgery in a group of 40 severely ill psychiatric patients, who had failed to respond satisfactorily to every other type of treatment. The results have been assessed clinically, psychologically and physiologically, in a very detailed way, at six weeks; a similar follow-up at one year is in progress. A comparison is made between the results of the present series and those of a previous: study (Kelly et al., 1972), in which more extensive leucotomy operations were carried out, and similar means of assessment were employed.