Eficacia y seguridad del taponamiento uterino para control de hemorragia y disminución de histerectomía obstétrica: cohorte histórica en Nuevo León, México, 2013 / Efficacy and safety of uterine tamponade to control bleeding and reduce obstetric hysterectomy: historic cohort in Nuevo León, México, 2013

Objetivo: realizar una aproximación a la eficacia y seguridad del taponamiento uterino para el control de la hemorragia obstétrica y reducir la necesidad de histerectomía obstétrica.Materiales y métodos: cohorte histórica de mujeres mayores de edad con diagnóstico de hemorragia obstétrica secundaria a atonía que no respondían a manejo inicial, con sangrado del lecho placentario secundario a placentación anormal o secundaria a aborto incompleto, a las cuales se les realizó taponamiento uterino, en la Unidad Médica de Alta Especialidad No. 23 de Ginecología y Obstetricia de la ciudad de Monterrey, hospital de concentración de tercer nivel de atención, ubicado en el estado de Nuevo León (México), de enero a diciembre de 2013. A partir del expediente clínico se registraron las características sociodemográficas y clínicas basales, los datos de laboratorio previo al evento obstétrico y posterior al taponamiento, así como el tiempo de taponamiento en horas, cantidad de insuflación del balón uterino, indicación para el procedimiento, cantidad de sangrado estimado durante el evento obstétrico y posterior a la colocación del balón, control de la hemorragia y necesidad de histerectomía. Se utilizó estadística descriptiva, medidas de dispersión y de tendencia central.Resultados: se incluyeron 161 pacientes con diagnóstico de hemorragia obstétrica, 147 posterior a parto o cesárea y 14 posterior al aborto, entre 16 y 42 años de edad. Se documentó un resultado satisfactorio en más del 95 % posterior al parto o la cesárea, y en más del 93 % posaborto. La permanencia del taponamiento para ambos casos tuvo una media de 20 horas.Conclusiones: este estudio soporta el uso de taponamiento uterino como medida terapéutica eficaz y segura para controlar la hemorragia y evitar una laparotomía o histerectomía, con una disminución de la morbilidad.

Objective: Examine the efficacy and safety of uterine tamponade for controlling obstetric bleeding and reducing the need for obstetric hysterectomy.Materials and methods: Historic cohort of adult women diagnosed with obstetric bleeding secondary to uterine atony that did not respond to the initial management, with bleeding of the placental bed secondary to abnormal placentation or to incomplete abortion, subjected to uterine tamponade at the Highly Specialized Gynaecology and Obstetrics Medical Unit No. 23, a Level III Hospital in the city of Monterrey, state of Nuevo Leon, Mexico, between January and December 2013. Information about social, demographic and baseline clinical characteristics, laboratory values before the obstetric event and after the tamponade procedure, as well as the inflation volume of the balloon, the indication of the procedure, the estimated amount of bleeding during the event and after placement of the tamponade balloon, control of bleeding, and need for hysterectomy, was derived from the clinical record. Descriptive statistics, scatter measurements, and central trends were used.Results: Overall, 161 patients between the ages of 16 and 42 years, with a diagnosis of obstetric haemorrhage were included, 147 following delivery or caesarean section, and 14 following miscarriage. A satisfactory result was documented in more than 95 % of cases after delivery or caesarean section, and in more than 93 % post abortion cases. The mean tamponade time for both groups was 20 hours.Conclusions: This study supports the use of uterine tamponade as an effective and safe therapeutic measure to control bleeding and avoid laparotomy or hysterectomy, and to reduce morbidity.

Estudio morfométrico de la arteria radial y su implicación en la cirugía de revascularización miocárdica / Morphometric study of the radial artery and its involvement in bypass surgery grafting

La arteria radial (AR) es utilizada en la práctica médica para la realización de diversos procedimientos quirúrgicos, entre los que destaca la cirugía de revascularización miocárdica. En la literatura actual hay poca información acerca de la compatibilidad de esta arteria con otros conductos vasculares. El objetivo fue determinar las características anatómicas, morfométricas y distribución de la arteria radial en el antebrazo. Se disecó la arteria radial de 10 antebrazos de cadáveres embalsamados; se identificaron y registraron los ramos musculares y vasa nervorum emitidos por la arteria, se midió la longitud total y obtuvieron tres muestras (proximal, media y distal) de cada una para ser procesadas mediante técnicas histológicas y se determinaron los grosores de la túnica media y los diámetros. Se observaron modas de 8 ramos arteriales para el músculo braquiorradial, 4 para los músculos flexor superficial de los dedos y flexor radial del carpo, un ramo arterial único para el músculo pronador cuadrado y una moda de 1 vasa nervorum para el ramo superficial del nervio radial. La longitud total de la arteria fue de 21,94 cm (+/-3,34). Los grosores encontrados fueron de 196,16 µm (+/-72,35), 148,25 µm (+/-40,40) y 158,96 µm (+/-45,74) en los segmentos proximal, medio y distal respectivamente. Los diámetros luminales mostraron una media de 1,48 mm (+/-0,70) en la región proximal, 1,01mm (+/-0,35) en la media y 1,43 mm (+/-0,47) en la distal. Considerando las características morfométricas, la arteria radial es una opción que satisface los criterios de longitud, diámetro luminal y grosor para ser utilizada como injerto.

The radial artery (RA) is used in medical practiceto performdifferentsurgical procedures, of which most realized is the coronary artery bypass graftsurgery. In the current literature there is little information about the compatibility of this artery with other vascular conduits. Therefore the aim of this study was to determine the anatomical, morphometric and distribution characteristics of radial artery on the forearm. Radial artery was dissected from the forearms of 10 embalmed cadavers, muscular branches and vasa nervorum were identified and registered, total length was measured. Three samples of each artery were obtained(proximal, middle and distal) to be processedby histological techniques and to determinethe thickness of its tunica mediaand its diameters. The results show a mode of 8 arterial branches to the brachioradialis, a mode of 4 for thesuperficial flexor muscles of the fingers and flexor carpi radialis, we found an unique arterial branch to the pronator quadratus and a mode of 1 vasa nervorum of superficial branch of radial nerve. The total length of the artery was 21.94 cm (+/- 3.34). The vascular wall thickness we found were 196.16 mm (+/-72.35), 148.25 mm (+/-40.40) and 158.96 mm (+/-45.74) in the proximal, middleand distal segments respectively. The luminal diameters showed an average of 1.48 mm (+/-0.70) in the proximal region, 1.01 mm (+/-0.35) in the middle region and 1.43 mm (+/-0.47) in the distal region. In the present study we concludedthat considering the morphometric characteristics, the radial artery is an option that satisfied the criteria of length, thickness and luminal diameterto be used as a graft in the coronary artery bypass graft surgery.

A morphometric study of the extraocular muscles / Estudio morfométrico de los músculos extraoculares

Extraocular muscles are important references in strabismus surgery and in placement of intraorbital devices. We analyzed extraocular muscles morphometry and possible anatomical variances of 20 orbits. We report the length, width, and points of insertion of the extraocular muscles. No anatomical variations in length, width and points of insertion were found. With regard to the rectus muscles, it was found that the superior rectus and lateral rectus are the longest muscles and that the width difference between the superior and inferior rectus is greater than that between the medial and lateral rectus and that the point of insertion of the rectus muscles has a variable morphology. The superior oblique muscle was smaller in caliber than the inferior oblique, as consistent with previous anatomical studies. Knowledge of the detailed morphology of extraocular muscles is fundamental in strabismus surgery and represents a key factor for the innovation of surgical techniques and orbital procedures.

Los músculos extraoculares son importantes en la cirugía de estrabismo y en la colocación de dispositivos intraorbitarios. Analizamos la morfometría de los músculos extraoculares y las posibles variaciones anatómicas en 20 orbitas. No encontramos variantes en longitud, anchura y sitios de inserción. Los músculos rectos superior y lateral son los mas largos; la diferencia en longitud entre los músculos rectos superior e inferior es mayor a la diferencia en longitud entre los músculos rectos medial y lateral. El músculo oblicuo superior es mas pequeño en calibre que el músculo oblicuo inferior, lo que coincide con otros estudios anatómicos. El conocimiento detallado de la morfología de los músculos extraoculares es fundamental en la cirugía de estrabismo y representa un factor clave para la innovación de técnicas quirúrgicas y procedimientos en la cavidad orbitaria.

Morphometric Study of Cervical Vertebrae C3-C7 in a Population from Northeastern Mexico / Estudio Morfométrico de las Vértebras Cervicales C3-C7 en una Población del Noreste de México

Knowing the dimensions of the vertebral elements is very important for the development of instrumentation related to the cervical spine. Ethnic variations have been reported in these dimensions and, to date, there have been no morphometric studies of this area performed on the Mexican population. We conducted a morphometric study of 150 cervical vertebrae (C3-C7) obtained from a northeastern Mexican population to determine the dimensions of the bodies, pedicles, laminae, spinous processes, and superior and inferior articular processes. We did not find significant differences (p<0.05) in measurements taken of the left and right sides. The dimensions of the vertebral bodies were larger at lower levels. The pedicles of the C3 vertebra were larger in all dimensions compared to the other vertebrae. The largest height of the laminae was observed at C7 and the largest transverse length was observed at C5. The dimensions of the bodies, spinous processes, and laminae increased from C3-C7, whereas the dimensions of the pedicles and superior and inferior articular process height decreased toward the lower cervical levels.

Las mediciones de los elementos vertebrales son importantes para la instrumentación de columna cervical. Se han reportado variaciones étnicas en estas medidas y en la actualidad no existen estudios morfométricos en la población mexicana. Se realizó un estudio morfométrico en 150 vértebras cervicales (C3-C7) para determinar las medidas de los cuerpos, pedículos, láminas, procesos espinosos y articulares superiores e inferiores. No se encontraron diferencias significativas (p<0.05) en las medidas tomadas entre ambos lados. Las dimensiones de los cuerpos vertebrales se incrementan en niveles más bajos. Los pedículos de la vértebra C3 son mayores en todas sus dimensiones. La mayor altura de las láminas se observó en C7 y la mayor longitud transversal en C5. Las dimensiones del cuerpo, procesos espinosos y láminas se incrementan de C3-C7, mientras las dimensiones de los pedículos, altura de procesos articulares superiores e inferiores disminuyen en los niveles cervicales más bajos.

[Study of the vascular morphology of the lower limb nerves used as grafts]. / Estudio de la morfología vascular en los nervios de la extremidad inferior utilizados como injertos.

INTRODUCTION: The placement of a vascularized nervous graft is an option for acute nervous injuries treatment, as this has demonstrated a longer viability. OBJECTIVE: To carry out a macroscopic and microscopic analysis of the vascularity of the main lower limb nerves used as vascularized nervous grafts. MATERIALS AND METHODS: It was followed out a descriptive, transversal and non-comparative study to analyse the saphenous, the sural, the deep peroneal and the superficial peroneal nerves vascularity. This study was performed in two stages: 1) an in situ vascularity study and 2) a morphometric study. RESULTS: By the in situ study, it was demonstrated the following: the total length of the lower limb nerves used as graft, was in a decrease order: sural nerve (micro = 29.26 cm, +/- 4.05 cm), superficial peroneal nerve (micro = 28.61 cm, +/- 3.97 cm), deep peroneal nerve (micro = 26.64 cm, +/- 5.21 cm) and saphenous nerve (micro = 25.12 cm, +/- 4.42 cm). The morphometric study demonstrated that the dominant artery with the major diameter belongs to the saphenous nerve, with a diameter of 1.13 mm; then we have the superficial peroneal nerve with a 1.01 mm diameter, followed by the deep peroneal nerve with 0.91 mm, and finally the sural nerve with the smallest diameter, 0.85 mm. CONCLUSIONS: The saphenous nerve has the most appropriated morphological characteristics to be used as a vascularized graft; by the contrary the deep peroneal nerve represents the last option from all the nerves included in this study.

[New microsurgical model for the study of the morphological adaptative response of venous grafts]. / Nuevo modelo microquirúrgico para el estudio de la respuesta morfológica adaptativa de injertos venosos.

INTRODUCTION: Animal models have been developed for the study of the intimal hyperplasia, a common cause of venous graft stenosis. OBJECTIVE: To establish a venous graft animal model for the study of the morphologic adaptative response to the arterial circulation. MATERIAL AND METHODS: A venous graft was placed in the arterial circulation of the caudal extremity from Wistar rats. In order to develop the model, it was carried out a morphologic study of the caudal extremity blood vessels. Three possible sites were evaluated for the obtaining of the venous graft. RESULTS: Graft permeability and viability were observed only in one segment, between the muscular branches and the origin of the saphenous vein. The portion of vein that was obtained from one extremity, was placed in the arterial circulation of the opposite extremity. CONCLUSIONS: A venous graft animal model was established, using a femoral vein segment, between the muscular branches and the origin of the saphenous vein, placing it in the homonyme artery of the opposite extremity.