JUAN CAMILO MOLINA DAZA - Academia.edu (original) (raw)
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Papers by JUAN CAMILO MOLINA DAZA
Obesity Surgery, 2012
Background Bariatric surgery is the most effective treatment for gastro-esophageal reflux disease... more Background Bariatric surgery is the most effective treatment for gastro-esophageal reflux disease (GERD) in obese patients, with the Roux-en-Y gastric bypass being the technique preferred by many surgeons. Published data reporting the results of laparoscopic sleeve gastrectomy (LSG) in patients with GERD are contradictory. In a previous observational study, we found that relative narrowing of the distal sleeve, hiatal hernia (HH), and dilation of the fundus predispose to GERD after LSG. In this study, we evaluated the effects of standardization of our LSG technique on the incidence of postoperative symptoms of GERD. Methods This was a concurrent cohort study. Patients who underwent bariatric surgery at our center were followed prospectively. LSG was performed in all patients in this series. Results A total of 234 patients underwent surgery. There were no cases of death, fistula, or conversion to open surgery. All 134 patients who completed 6-12 months of postoperative follow-up were evaluated. Excess weight loss at 1 year was 73.5 %. In the study group, 66 patients (49.2 %) were diagnosed with GERD preoperatively, and HH was detected in 34 patients (25.3 %) intraoperatively. HH was treated by reduction in three patients, anterior repair in 28, and posterior repair in three. Only two patients (1.5 %) had symptoms of GERD at 6-12 months postoperatively. Conclusions Our results confirm that careful attention to surgical technique can result in significantly reduced occurrence of symptoms of GERD up to 12 months postoperatively, compared with previous reports of LSG in the literature.
Biodiversity Data Journal, 2015
Northwestern South America harbors one of the richest herpetofauna in the world. The connection a... more Northwestern South America harbors one of the richest herpetofauna in the world. The connection among several biogeographic provinces along with climatic and orographic complexity makes this region an important contributor to the Neotropical biodiversity. Despite of this importance, the amphibian and reptile fauna in this area remains largely unknown as few herpetological collections has been made in recent decades. Motivated by this, the Herpetological Museum at the Universidad de Antioquia (Medellín, Colombia) has been increasing the collection in the last 16 years to better understand the herpetofaunal diversity and thus contribute to ecological, systematic, biogeographic and conservation research in the Neotropics. Here, we present the results of this effort and highlight how future collection will impact our understanding of the Neotropical herpetofauna.
Conservation Biology of Freshwater Turtles and Tortoises, 2010
The Colombian slider, Trachemys callirostris (Family Emydidae), is a moderatesized turtle (carapa... more The Colombian slider, Trachemys callirostris (Family Emydidae), is a moderatesized turtle (carapace length to 33 cm) endemic to northern South America, with two recognized subspecies: T. c. callirostris in northern Colombia and northwest Venezuela, and T. c. chichiriviche further east along the Venezuelan coast. The two subspecies are distinguished by various aspects of their coloration and the structure of the second neural bone. There also may be differences in adult sizes, with T. c. callirostris being atypically small for a tropical slider turtle, but this may reflect the intense hunting pressures nesting females of this subspecies experience in most areas of its distribution. Trachemys callirostris is sexually dimorphic, with females being larger. While different populations may differ in mean body size, morphometric and genetic studies have provided no evidence for significant intra-specific variation besides the morphological differences between the two subspecies. These turtles are habitat generalists, omnivores, and bask frequently, but little else concerning their demography or non-breeding ecology is known. Nesting occurs during the dry season (December-May) and eggs are usually buried under low vegetation in moist soil near the shoreline. Clutch size depends on female size, and varies from 1-23 eggs. Predation on eggs and egg incubation failure is common. A study of incubation temperatures in natural nests found that with a mean incubation temperature of 31.7°C, all neonates produced were females, implying the species has temperature-dependent sex determination. Adults and nests are exploited throughout the range of the species, and despite protection by national legislation and the existence of several protected areas within the range of the species, current levels of exploitation probably are not sustainable. Enforcement of existing legislation and demographic monitoring are needed.
Obesity Surgery, 2012
Background Bariatric surgery is the most effective treatment for gastro-esophageal reflux disease... more Background Bariatric surgery is the most effective treatment for gastro-esophageal reflux disease (GERD) in obese patients, with the Roux-en-Y gastric bypass being the technique preferred by many surgeons. Published data reporting the results of laparoscopic sleeve gastrectomy (LSG) in patients with GERD are contradictory. In a previous observational study, we found that relative narrowing of the distal sleeve, hiatal hernia (HH), and dilation of the fundus predispose to GERD after LSG. In this study, we evaluated the effects of standardization of our LSG technique on the incidence of postoperative symptoms of GERD. Methods This was a concurrent cohort study. Patients who underwent bariatric surgery at our center were followed prospectively. LSG was performed in all patients in this series. Results A total of 234 patients underwent surgery. There were no cases of death, fistula, or conversion to open surgery. All 134 patients who completed 6-12 months of postoperative follow-up were evaluated. Excess weight loss at 1 year was 73.5 %. In the study group, 66 patients (49.2 %) were diagnosed with GERD preoperatively, and HH was detected in 34 patients (25.3 %) intraoperatively. HH was treated by reduction in three patients, anterior repair in 28, and posterior repair in three. Only two patients (1.5 %) had symptoms of GERD at 6-12 months postoperatively. Conclusions Our results confirm that careful attention to surgical technique can result in significantly reduced occurrence of symptoms of GERD up to 12 months postoperatively, compared with previous reports of LSG in the literature.
Biodiversity Data Journal, 2015
Northwestern South America harbors one of the richest herpetofauna in the world. The connection a... more Northwestern South America harbors one of the richest herpetofauna in the world. The connection among several biogeographic provinces along with climatic and orographic complexity makes this region an important contributor to the Neotropical biodiversity. Despite of this importance, the amphibian and reptile fauna in this area remains largely unknown as few herpetological collections has been made in recent decades. Motivated by this, the Herpetological Museum at the Universidad de Antioquia (Medellín, Colombia) has been increasing the collection in the last 16 years to better understand the herpetofaunal diversity and thus contribute to ecological, systematic, biogeographic and conservation research in the Neotropics. Here, we present the results of this effort and highlight how future collection will impact our understanding of the Neotropical herpetofauna.
Conservation Biology of Freshwater Turtles and Tortoises, 2010
The Colombian slider, Trachemys callirostris (Family Emydidae), is a moderatesized turtle (carapa... more The Colombian slider, Trachemys callirostris (Family Emydidae), is a moderatesized turtle (carapace length to 33 cm) endemic to northern South America, with two recognized subspecies: T. c. callirostris in northern Colombia and northwest Venezuela, and T. c. chichiriviche further east along the Venezuelan coast. The two subspecies are distinguished by various aspects of their coloration and the structure of the second neural bone. There also may be differences in adult sizes, with T. c. callirostris being atypically small for a tropical slider turtle, but this may reflect the intense hunting pressures nesting females of this subspecies experience in most areas of its distribution. Trachemys callirostris is sexually dimorphic, with females being larger. While different populations may differ in mean body size, morphometric and genetic studies have provided no evidence for significant intra-specific variation besides the morphological differences between the two subspecies. These turtles are habitat generalists, omnivores, and bask frequently, but little else concerning their demography or non-breeding ecology is known. Nesting occurs during the dry season (December-May) and eggs are usually buried under low vegetation in moist soil near the shoreline. Clutch size depends on female size, and varies from 1-23 eggs. Predation on eggs and egg incubation failure is common. A study of incubation temperatures in natural nests found that with a mean incubation temperature of 31.7°C, all neonates produced were females, implying the species has temperature-dependent sex determination. Adults and nests are exploited throughout the range of the species, and despite protection by national legislation and the existence of several protected areas within the range of the species, current levels of exploitation probably are not sustainable. Enforcement of existing legislation and demographic monitoring are needed.