Douglas E. Ott

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OBJECTIVE To assess the efficacy and safety of Insuflow (Georgia BioMedical, Inc.) filter heater hydrator device in reducing the incidence, severity and extent of hypothermia, length of recovery room stay and postoperative pain at the time of laparoscopy. DESIGN Prospective, randomized, blinded, controlled multi-center study. Patients underwent(More)
STUDY OBJECTIVE To determine the distribution and concentration of aerosol particles caused by an ultrasonic (Harmonic) scalpel during simulated surgical use. DESIGN Prospective experimental analysis (Canadian Task Force classification II-1). SETTING Standard operating room. MATERIALS Lean pork, lean beef, water, and blood, and the Harmonic scalpel(More)
BACKGROUND AND OBJECTIVES Explanations for laparoscopic-induced hypothermia fail to explain clinical observations. It is possible that water evaporation occurs from the jet stream of gas inflation resulting in tissue surface super-cooling leading to tissue damage and drying. METHODS Theoretical calculations based on thermal conductivity, mass transfer(More)
OBJECTIVE The carbon monoxide (CO) smoke component from tissue pyrolysis was evaluated for peritoneal absorption in patients undergoing laparoscopy to determine its effects and ability to be detected in peripheral blood. SUMMARY BACKGROUND DATA Previous studies have demonstrated changes in peripheral methemoglobin levels as a result of peritoneal(More)
Laparoscopic peritoneal adhesion formation follows a pathway similar to laparotomy, both of which are only partially understood. Laparoscopic adhesion formation is complicated and influenced by pressure, dry gas desiccation, and hypoxia caused and superimposed by the pneumoperitoneum. It may further be affected by products of tissue combustion and(More)
  • Douglas E. Ott
  • JSLS : Journal of the Society of Laparoendoscopic…
  • 2003
OBJECTIVE To assess the effects of gas flow during insufflation on peritoneal fluid and peritoneal tissue regarding transient thermal behavior and thin-film evaporation. The effects of laparoscopic gas on peritoneal cell desiccation and peritoneal fluid thin-film evaporation were analyzed. METHODS Measurment of tissue and peritoneal fluid and analysis of(More)
STUDY OBJECTIVE To assess the changes in viscosity of peritoneal fluid during laparoscopic exposure to CO2 insufflation. DESIGN Analysis and mathematic modeling of peritoneal fluid viscosity in vivo and in vitro as a result of exposure to unconditioned CO2 (Canadian Task Force classification II-2). SETTING Medical school university research laboratory(More)
STUDY OBJECTIVE To assess the effect of port size in relation to laparoscopic gas flow and to determine the terminal velocity of gas flow during insufflation. DESIGN Analysis and mathematical modeling of gas flow characteristics. SETTING University biomedical engineering department. INTERVENTION Analytic calculations including Bernoulli's equation to(More)
The pneumoperitoneum has a direct effect on the peritoneum and influences the outcome of laparoscopic surgery. The quality of the gas used, its temperature and dryness cause physical and chemical alterations that are preventable. The traditional gas is 20°C and 0.0002% relative humidity (RH). The normal peritoneal cavity condition is 36°C and virtually 100%(More)
  • Douglas E. Ott
  • JSLS : Journal of the Society of Laparoendoscopic…
  • 1997
OBJECTIVE Laparoscopic procedures utilize a pneumoperitoneum to distend and separate the abdominal wall from the intra-abdominal structures. Carbon dioxide is commonly used for this purpose, although this study is inclusive of any gas used for abdominal distention. The gas is delivered from cylinders through a gas insufflation delivery system. The purpose(More)