Thermocoagulation as a Surgical Approach for the Treatment of Obsessive-Compulsive Disorder in Refractory Patients: Systematic Review

Obsessive-compulsive disorder (OCD), a disabling chronic neuropsychiatric disease, entails high economic costs to society and has high morbidity and mortality rates. The first-line treatments for OCD are selective serotonin reuptake inhibitors and cognitivebehavioral therapy. However, this disorder has the highest refractory index to noninvasive treatment. Alternatively, ablative thermocoagulation neurosurgical techniques have shown efficacy and few adverse effects. The present systematic review aimed to identify validated protocols to observe the effectiveness of ablative procedures in the treatment of severe and refractory OCD, as well as their possible adverse effects and benefits. This review supports the effectiveness of ablative methods by presenting them as a safe non-experimental therapeutic option for cases of highlyrefractory OCD. Additional relevant findings were the improvement in cognitive function, functional capacity, affective orientation, and quality of life, which contribute to the destigmatization of this surgical technique. Further controlled studies may lead to the individualization of recommendations of targets for ablative thermocoagulation.

Efecto de la amigdalotomía e hipotalamotomía unilateral en pacientes con agresividad refractaria / Effect of tonsillotomy and unilateral hypothalamotomy in patients with refractory aggressiveness

Resumen Antecedentes: El tratamiento neuroquirúrgico, aunque polémico, se considera un recurso útil en el tratamiento de enfermedades psiquiátricas crónicas como la agresividad refractaria. Objetivo: Evaluar los resultados clínicos y los efectos colaterales de la hipotalamotomía posteromedial (HPM) asociada a amigdalotomía en pacientes con agresividad refractaria. Método: Se realizó un ensayo clínico en pacientes con agresividad crónica y refractaria a tratamiento farmacológico. Se les realizó amigdalotomía central asociada a HPM mediante termocoagulación por radiofrecuencia. El grado de agresividad se cuantificó mediante la escala global de agresividad de Yudofsky. Los cambios postoperatorios en la conducta agresiva continuaron siendo evaluados cada 6 meses durante al menos 36 meses. Resultados: Se observó un cambio estadísticamente significativo de la conducta agresiva, a lo largo de 36 meses de seguimiento. Se describen los efectos colaterales de la asociación de ambos procedimientos, siendo el de mayor frecuencia la somnolencia y algunos casos de reducción en la conducta sexual. Conclusión: Las lesiones unilaterales simétricas y simultáneas del núcleo central de la amígdala y del hipotálamo posteromedial contralaterales a la dominancia motora dan el mismo efecto clínico en la reducción de la agresividad patológica que las lesiones bilaterales.

Abstract Background: Neurosurgical treatment, although controversial, is considered a useful resource in the treatment of chronic psychiatric diseases such as refractory aggressiveness. Objective: To evaluate the clinical results and side effects of posteromedial hypothalamotomy associated with amygdalotomy in patients with refractory aggressiveness. Method: A clinical trial was conducted in patients with chronic aggressiveness and refractory to pharmacological treatment. A central amygdalotomy associated with posteromedial hypothalamotomy was performed using thermo-coagulation by radiofrequency. The degree of aggressiveness was quantified by the Yudofsky's global scale of aggression. Postoperative changes in aggressive behavior continued to be evaluated every 6 months for at least 36 months. Results: A statistically significant change in aggressive behavior was observed during 36 months of follow-up. The collateral effects of the association of both procedures are described, the most frequent being drowsiness and some cases of reduction in sexual behavior. Conclusion: Symmetric and simultaneous unilateral lesions of the central nucleus of the amygdala and the posteromedial hypothalamus contralateral to motor dominance give the same clinical effect in the reduction of the pathological aggression that the bilateral lesions.

Migration of Oxidized Cellulose to the Ventricle as a Complication of Endoscopic Third Ventriculostomy: A Case Report

Endoscopic third ventriculostomy (ETV) is an increasingly common neurosurgical procedure. Hemostatic agentes (porcine gelatin and oxidized cellulose) are normally placed to plug the cortical hole after ETV to avoid cerebral spinal fluid leakage, subdural hygroma, and hemorrhage. Here we report the case of a 6-year-old boy with hydrocephalus who underwent ETV and which oxidized cellulose was placed to plug the cortical hole.Magnetic resonance imaging of the head performed 3 months after the procedure showed the presence of oxidized cellulose in the ventricle. After an unsuccessful attempt to remove the cellulose, it was decided that the patient should be kept under observation. Twoyears later, the child is in good health and without any complaints. Hemostatic agents (especially oxidized cellulose) used on the cortical hole after ETV can migrate to the ventricle and compromise the procedure. Follow-up should be performedfor such patients, and the main focus should be on not causing further injury.