RESUMO
Epidural catheter placement is one of the most effective, secure, and worldwide used pain control modalities. Epidural catheter dislodgment is a common cause of epidural block failure. The diagnosis of this situation is usually presumptive, and cases in which the actual trajectory and final location of the catheter are witnessed by imaging are rare. We present two cases of the insufficient epidural block due to catheter migration, confirmed by a CT scan with radiopaque contrast injection through the catheter. In the first case, the catheter tip was identified in the left major psoas muscle. Some catheter holes were probably located in a border zone between two compartments, which made the analgesic efficacy dependent on the infusion rate. In the second case, the catheter tip was identified as lodged in the left paravertebral space, which explains only unilateral left pain relief. In selected situations, like repeated ineffectiveness and in pretended long-duration catheters, imaging tests may be useful to determine the actual position of the catheter and identify anatomical variations that may lead to an incorrect replacement.
RESUMO
Abstract: Porphyrias are a group of rare diseases, which include acute intermittent porphyria. It is essential for the anesthesiologist to identify acute porphyrias and to recognize a porphyric crises. These can be triggered by several factors, which can be present throughout the perioperative period. A 70-year-old male, ASA III, with a personal history of acute intermittent porphyria and ischemic heart disease, scheduled for laparoscopic sigmoidectomy. Prolonged fasting, dehydration and potentially porphyrinogenic drugs were avoided. General anesthesia was induced with fentanyl, lidocaine, propofol and rocuronium and maintained with desflurane. The decision to reverse the neuromuscular blockade with sugammadex was considered due to the benefits over risks of this drug when compared to neostigmine (associated with atropine) and the description of its use without harm in two cases of variegate porphyria. The following paper emphasize the importance of careful anesthetic management throughout the perioperative period and describe a case of successful reversal of neuromuscular block with sugammadex, highlighting this case as the first case reported of its use in acute intermittent porphyria.
Resumen: Las porfirias son un grupo de enfermedades raras, entre las que se encuentra la porfiria aguda intermitente. Es fundamental que el anestesista identifique las porfirias agudas y reconozca una crisis porfírica. Éstos pueden ser desencadenados por varios factores, que pueden estar presentes durante todo el periodo perioperatorio. Varón de 70 años, ASA III, con antecedentes personales de porfiria aguda intermitente y cardiopatía isquémica, programado para sigmoidectomía laparoscópica. Se evitó el ayuno prolongado, la deshidratación y los fármacos potencialmente porfirinógenos. La anestesia general se indujo con fentanilo, lidocaína, propofol y rocuronio y se mantuvo con desflurano. La decisión de revertir el bloqueo neuromuscular con sugammadex se consideró debido a los beneficios sobre los riesgos de este fármaco en comparación con la neostigmina (asociada con la atropina) y a la descripción de su uso sin daños en dos casos de porfiria variegada. El siguiente artículo enfatiza la importancia de un manejo anestésico cuidadoso durante todo el periodo perioperatorio y describe un caso de reversión exitosa del bloqueo neuromuscular con sugammadex, destacando este caso como el primero reportado de su uso en porfiria aguda intermitente.
