Biomedical subjects

Rogelio Calderón

Publications and source records attributed to Rogelio Calderón.

3 recordsLinked to original sources

PubMed2006

[Cephalic pancreaticoduodenectomy with mesentericoportal venous reconstruction. Technical features].

Cephalic pancreaticoduodenectomy (CPD) with mesentericoportal venous resection increases the resectability rate of pancreatic tumors. When performed in selected patients and by experienced surgical teams, this technique shows the same long-term rates of morbidity, mortality and survival as CPD without vascular resection, provided that negative surgical margins are obtained. This procedure is contraindicated by complete thrombosis of the portal or superior mesenteric veins, invasion of the superior mesenteric artery or celiac trunk, and distant or periaortic lymph node involvement. Venous reconstruction can be performed through lateral suture, termino-terminal anastomosis, or by graft placement. We believe that intercalation of the autologous internal jugular vein facilitates resection and minimizes phenomena of venous stasis. We present a case of adenocarcinoma of the pancreatic head infiltrating the superior mesenteric-portal vein confluence that underwent surgery in our hospital. CPD with mesentericoportal venous resection and reconstruction using autologous internal jugular vein were performed. The most important technical features are discussed.

Adenocarcinoma↗

PubMed2005

[Prosthetic replacement of the inferior vena cava. Current controversies].

A ringed polytetrafluoroethylene (PTFE) graft is currently the most widely used replacement for the inferior vena cava, although clinical studies comparing this technique with non-ringed prostheses are lacking. There is no consensus on the need to use an anticoagulant or associate a temporary distal arteriovenous fistula to increase venous flow. At present, the best therapeutic strategy cannot be determined. We present a case of retroperitoneal sarcoma infiltrating the infrarenal vena cava, right colon and ureter that was surgically treated in our hospital. En bloc resection was performed and the vena cava was reconstructed using a non-ringed PTFE graft associated with systemic anticoagulation.

Adult↗

PubMed2005

A hydrodynamic study of pleural drainage systems: some practical consequences.

BACKGROUND: A pleural drainage system must be capable of efficiently evacuating the air or fluids from the pleural cavity so that adequate lung reexpansion can take place. The air flow and negative pressure of the system will depend on the particular design of each model. This experimental study analyzes the specifications and performance of the pleural drainage systems currently on the market. METHODS: Thirteen models of pleural drainage systems connected to wall suction were examined. The models were classified into the following three groups: dry systems; wet systems; and single-chamber systems. We determined the ambient air flow and the negative pressure generated according to the suction level. The components of each model are also described. RESULTS: Under normal conditions, dry (except for the Sentinel Seal; Sherwood Medical; Tullamore, Ireland), wet, and single-chamber systems reach similar air flow rates (17 to 30, 24 to 27, and 22 to 28 L/min, respectively). With higher wall suction levels, wet systems increase the air flow (26 to 49 L/min) but the negative pressure becomes unstable because of the water loss phenomenon, dry systems increase the air flow (29 to 50 L/min) without modifying the regulator pressure, and single-chamber systems also raise the air flow (45 to 51 L/min) but increase the negative pressure. When there is an air leak, dry systems (except for the Sentinel Seal) lose less negative pressure than the other systems. CONCLUSIONS: The functioning of these systems can be optimized only by applying a suitable wall suction level adjusted to each case. Although the three types of systems are capable of evacuating adequate air flow rates, the negative pressure and the capacity to maintain it in the presence of an air leak are different in each system. Being fitted with valves and not water compartments makes the dry systems the safest and the ideal for use when the patient has to be moved.

Biomechanical Phenomena↗