A Pérez-Zamarrón

Hospital Universitario La Paz, Madrid, Madrid, Spain

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Publications (23)21.94 Total impact

  • Neurología. 09/2014; 29(7):443–445.
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    ABSTRACT: One of the most life-threatening complications after the obliteration of intracranial arteriovenous malformations is the development of oedema and/or multifocal haemorrhage. Two main theories have been postulated so far in order to explain this situation. On one hand, "normal perfusion pressure breakthrough phenomenon" is based on the loss of cerebral vessel autoregulation due to the chronic vasodilation of perinidal microcirculation. On the other hand, the "occlusive hyperaemia" deals with thrombotic and venous obstruction phenomena that may also generate such manifestations. The aim of this study is to resume the main concepts of the "normal perfusion pressure breakthrough phenomenon" theory as well as the related animal models described up to date, their advantages and disadvantages, and the main conclusions obtained as a result of the experimental research.
    Neurosurgical Review 04/2014; · 1.97 Impact Factor
  • Neurologia 04/2013;
  • R Gutiérrez-González, G R Boto, A Pérez-Zamarrón
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    ABSTRACT: Hydrocephalus is a common neurosurgical disease affecting approximately 40 per 100,000 people. Cerebrospinal fluid diversion devices are essential in the management of this pathology. These devices include internal shunts and external ventricular drains. Infection is the most significant complication resulting from the high frequency of appearance and the consequences it involves, since it is associated with increased morbidity and mortality. It also involves increased hospital costs (approximately 40,000 euro per episode). In the present report the authors make a comprehensive review of cerebrospinal fluid diversion devices and their most important complication: infection. The authors make special emphasis on the epidemiology, aetiology, pathogenesis, risk factors, symptoms and signs, diagnosis, treatment and prevention of infection.
    European Journal of Clinical Microbiology 09/2011; 31(6):889-97. · 3.02 Impact Factor
  • Neurocirugia (Asturias, Spain) 05/2009; 20(2):176-8. · 0.34 Impact Factor
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    ABSTRACT: Dural arteriovenous malformations of the middle cranial fossa are very rare. Venous drainage flows either through superficial leptomeningeal veins or through the sphenoparietal, sphenopetrous and/or sphenobasilar sinuses. They often have an aggressive course and therefore poor outcome. It is essential to analyse and understand the angioarchitecture of the dural arteriovenous malformations in order to select and plan the correct treatments. We describe an exceptional case of intraventricular haemorrhage caused by the rupture of a dural arteriovenous malformation of the middle cranial fossa. To our knowledge, this is the first case report of such characteristics described in the literature.
    Acta Neurochirurgica 03/2009; 151(8):1009-12. · 1.55 Impact Factor
  • Revista Clínica Española 02/2009; 209(1):54-5. · 2.01 Impact Factor
  • Neurocirugia (Asturias, Spain) 01/2009; 20(2). · 0.34 Impact Factor
  • Revista Clinica Espanola - REV CLIN ESPAN. 01/2009; 209(1):54-55.
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    ABSTRACT: Hemangiopericytoma is an uncommon mesenchymal neoplasm arising from Zimmerman's pericytes, which usually locates in soft tissues. Meningeal hemangiopericytoma accounts for less than 1% of all intracranial tumours. Typically, it behaves aggressively, showing distinct tendency to recur locally or distantly along the neural axis and to present extraneural metastases. We describe a 74-year-old patient who presented unspecific symptoms and whose physical exam revealed a painless retroauricular mass which was adhered to skin. Neuroimaging studies showed a large posterior fossa tumour with intense enhancement after contrast infusion that caused striking occipital-mastoid osteolysis and which was exclusively fed by external carotid artery branches. The patient underwent gross total resection of the tumour, and once the histological diagnosis of hemangiopericytoma was confirmed, she underwent initial adjuvant radiotherapy. Sixteen months after surgery, the patient remains recurrence free. The treatment of choice of intracranial hemangiopericytoma is gross total resection, which must be attempted when technically feasible, followed by adjuvant radiotherapy providing total doses over 50 Gy. This combination has demonstrated increasing recurrence- free interval in these patients. Close and longterm follow-up is mandatory in order to achieve early diagnosis of recurrence or metastases in these patients, since they can appear several years, even decades, after initial proper treatment.
    Neurocirugia (Asturias, Spain) 11/2008; 19(5):446-52. · 0.34 Impact Factor
  • Neurologia (Barcelona, Spain) 11/2008; 23(8):537-40. · 1.35 Impact Factor
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    ABSTRACT: Infection is a major complication after cerebrospinal fluid (CSF) shunt systems insertion. Antibiotic-impregnated (AI) catheters seem to reduce infection rate in clinical practice. The objective of this study was to determine if the use of AI catheters reduces Staphylococcus spp. infection rate, as it is the most commonly isolated organism. Authors retrospectively reviewed all patients who underwent rifampin-impregnated and clindamycin-impregnated catheters at our hospital. These included external ventricular catheters (inserted from January 2006 to January 2007) and internalized shunts (inserted from January 2004 to January 2007). They also reviewed patients who underwent insertion of non-impregnated external catheters and internalized shunts during the same periods. Overall infection rate, Staphylococcus spp. infection rate and gram negative bacilli infection rate were compared in both groups by means of chi2 test. Sixty-five procedures with AI catheters and 66 procedures with non-AI catheters were performed. Overall infection rate as well as Staphylococcus spp. infection rate were significantly lower in the AI catheters cohort (p = 0.046 and p = 0.029, respectively), without increasing gram negative bacilli infections. The use of rifampin and clindamycin-impregnated catheters is a useful tool to reduce Staphylococcus spp. infections after CSF shunting procedures. However, future clinical trials are required to confirm these results.
    Medicina Clínica 07/2008; 131(4):121-4. · 1.25 Impact Factor
  • Journal of Neurosurgery Spine 06/2008; 8(6):601. · 1.98 Impact Factor
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    ABSTRACT: Background and objective Infection is a major complication after cerebrospinal fluid (CSF) shunt systems insertion. Antibiotic-impregnated (AI) catheters seem to reduce infection rate in clinical practice. The objective of this study was to determine if the use of AI catheters reduces Staphylococcus spp. infection rate, as it is the most commonly isolated organism. Patients and method Authors retrospectively reviewed all patients who underwent rifampin-impregnated and clindamycin-impregnated catheters at our hospital. These included external ventricular catheters (inserted from January 2006 to January 2007) and internalized shunts (inserted from January 2004 to January 2007). They also reviewed patients who underwent insertion of non-impregnated external catheters and internalized shunts during the same periods. Overall infection rate, Staphylococcus spp. infection rate and gram negative bacilli infection rate were compared in both groups by means of χ2 test. Results Sixty-five procedures with AI catheters and 66 procedures with non-AI catheters were performed. Overall infection rate as well as Staphylococcus spp. infection rate were significantly lower in the AI catheters cohort (p = 0.046 and p = 0.029, respectively), without increasing gram negative bacilli infections. Conclusions The use of rifampin and clindamycin-impregnated catheters is a useful tool to reduce Staphylococcus spp. infections after CSF shunting procedures. However, future clinical trials are required to confirm these results.
    Medicina Clínica. 06/2008; 131(4):121–124.
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    ABSTRACT: Non-missile low velocity penetrating brain injuries are unusual among civilian population. They show specific characteristics different from missile wounds. In this paper we describe a rare case of self-inflicted penetrating head trauma by electric drill. We document neuroimaging studies and review the management concerning this pathology. To our knowledge, this is the first case of intracranial retained drill bit with such radiological findings reported in the literature. An 80-year-old male with no previous psychiatric disorder presented at our hospital after suffering an accident while working with an electric drill. Physical examination revealed right lower extremity plegia and three penetrating scalp wounds to the left parasagittal region. Skull X-ray and computed tomography demonstrated an intracranial metallic foreign body located in the left parietal lobe and an intraparenchymal hematoma with no mass effect close to the foreign body. The patient was taken to the operating room to remove the drill bit fragment. Antibiotic and antiseizure prophylaxis were administered. Postoperative computed tomography confirmed no residual metallic fragments and functional recovery was excellent. After psychiatric assessment, suicide attempt was confirmed and antidepressive therapy was then started. On follow-up, no complication was documented. It is essential to exclude penetrating brain trauma whenever a scalp wound is noticed in order to provide proper treatment and prevention care. The permanent neurological deficit in low velocity injuries is related to the degree and location of the primary injury. It also depends on an early diagnosis and treatment and the absence of delayed complications.
    Clinical Neurology and Neurosurgery 03/2008; 110(2):207-10. · 1.23 Impact Factor
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    ABSTRACT: El hemangiopericitoma es un tumor mesenquimal infrecuente originado de los pericitos de Zimmerman, que habitualmente asienta en tejidos blandos. Su variante meníngea supone menos del 1% de todos los tumores intracraneales. Característicamente presenta un comportamiento agresivo, con marcada tendencia a recurrir localmente y a lo largo del neuroeje, así como a metastatizar en localizaciones extraneurales. Presentamos el caso de una paciente de 74 años que debutó con clínica inespecífica, observándose durante la exploración física una masa retroauricular no dolorosa a la palpación, adherida a la piel. El estudio de neuroimagen demostró una lesión de gran tamaño localizada en la fosa posterior que realzaba intensamente tras la administración de contraste, asociada a llamativa osteolisis occípito-mastoidea y cuya vascularización provenía exclusivamente de ramas de la arteria carótida externa. La paciente se sometió a la resección quirúrgica completa de la lesión, administrándose radioterapia inicial adyuvante una vez confirmado histológicamente el diagnóstico de hemangiopericitoma. Dieciséis meses después de la intervención, la paciente se encuentra libre de enfermedad. El tratamiento de elección del hemangiopericitoma intracraneal es su resección quirúrgica completa, siempre que sea técnicamente posible, seguida de radioterapia adyuvante con dosis superiores a los 50 Gy. Esta combinación ha demostrado aumentar el intervalo de tiempo libre de recurrencia. Un estrecho seguimiento a largo plazo de estos pacientes es esencial para detectar recurrencias o metástasis a distancia precozmente, pudiendo aparecer incluso décadas después del adecuado tratamiento inicial.
    Neurocirugia (Asturias, Spain) 01/2008; · 0.34 Impact Factor
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    ABSTRACT: In this article, we describe our experience in surgical management of dural arteriovenous fistulae (dAVF). From August 2001 to February 2006 a total of six patients, were admitted at our hospital, 2 women and 4 men with ages between 40 and 68 years. Four of the six cases were entered through the service of Emergency Service by neurological deficit (in two cases) or decrease in the level of consciousness (in two patients); the remaining two patients were referred by lengthy headache and alterations on neuroimaging studies suggestive of dAVF. All of them showed dAVF in different locations which were treated successfully with surgery after angiographic studies. Although multiple therapeutic options are available, surgery is the treatment of choice in dAVF which shows aggressive clinical course, especially intracranial hemorrhage.
    Neurocirugia (Asturias, Spain) 11/2007; 18(5):383-92; discussion 392-3. · 0.34 Impact Factor
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    ABSTRACT: Retropharyngeal pseudomeningocele after atlanto-occipital dislocation is a rare complication, with only five cases described in the literature. It develops when a traumatic dural tear occurs allowing cerebrospinal fluid outflow, and it often appears associated with hydrocephalus. We present a case of a 29-year-old female who suffered a motor vehicle accident causing severe brain trauma and spinal cord injury. At hospital arrival the patient scored three points in the Glasgow Coma Scale. Admission computed tomography of the head and neck demonstrated subarachnoid hemorrhage and atlanto-occipital dislocation. Three weeks later, when impossibility to disconnect her from mechanical ventilation was noticed, a magnetic resonance imaging of the neck showed a large retropharyngeal pseudomeningocele. No radiological evidence of hydrocephalus was documented. Given the poor neurological status of the patient, with spastic quadriplegia and disability to breathe spontaneously due to bulbar-medullar injury, no invasive measure was performed to treat the pseudomeningocele. Retropharyngeal pseudomeningocele after atlanto-occipital dislocation should be managed by means of radiological brain study in order to assess for the presence of hydrocephalus, since these two pathologies often appear associated. If allowed by neurological condition of the patient, shunting procedures such as ventriculo-peritoneal or lumbo-peritoneal shunt placement may be helpful for the treatment of the pseudomeningocele, regardless of craniocervical junction management.
    European Spine Journal 11/2007; 17 Suppl 2:S253-6. · 2.47 Impact Factor
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    ABSTRACT: Objetivos. En este artículo describimos la experiencia quirúrgica de nuestro centro en el manejo quirúrgico de las malformaciones arteriovenosas durales intracraneales (MAVd¿s). Material y métodos. Presentamos una serie de seis casos, dos mujeres y cuatro hombres, con edades comprendidas entre 40 y 68 años, en el periodo que transcurre entre los años 2001 y 2006, en el Hospital Clínico San Carlos de Madrid. Resultados. Cuatro de los seis casos fueron ingresados a través del servicio de Urgencias por clínica deficitaria (en dos casos) o disminución del nivel de conciencia (en dos pacientes); los dos restantes fueron remitidos desde consultas externas por cefalea de larga evolución y alteraciones en el estudio de neuroimagen sugerentes de FAVd o MAVd. En todos ellos el tratamiento quirúrgico fue definitivo. Conclusiones. A pesar las múltiples opciones terapéuticas, la cirugía es de elección en MAVd que presenta especial tendencia a comportarse de forma agresiva; fundamentalmente con riesgo de hemorragia intracraneal.
    Neurocirugia (Asturias, Spain) 01/2007; · 0.34 Impact Factor
  • Revista de neurologia 01/2006; 43(5):311-2. · 1.18 Impact Factor

Publication Stats

51 Citations
21.94 Total Impact Points

Institutions

  • 2013
    • Hospital Universitario La Paz
      • Servicio de Neurocirugía
      Madrid, Madrid, Spain
  • 2008–2011
    • Hospital Clínico San Carlos
      • Servicio de Neurocirugía
      Madrid, Madrid, Spain