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We measured chest wall "pathway impedances" (ratios of pressure changes to rates of volume displacement at the surface) with esophageal and gastric balloons and inductance plethysmographic belts around the rib cage and abdomen during forced volume oscillations (5% vital capacity, 0.5-4 Hz) at the mouth of five relaxed, seated subjects. Volume displacements(More)
Little is known about the fate of inhaled aerosol particles in birds; even the anatomical location of phagocytic cells within the lungs has yet to be clearly demonstrated. We exposed 2 anesthetized, spontaneously breathing ducks to a non-toxic iron oxide aerosol (aerodynamic mass mean diameter = 0.18 micron; 460 mg/m3) for 1.75 h and 2 awake, resting ducks(More)
We measured oxygen consumption (VO2), carbon dioxide production (VCO2), minute volume (VE), respiratory frequency (f) and tidal volume (VT) of chickens during 15 min treadmill exercise at 0.5 ms-1 and 0.8 ms-1 at thermoneutral (23 degrees C), low (9 degrees C) and high (34 degrees C) ambient temperature (Ta); the vertebral canal was cooled to 34 degrees C(More)
To understand how bical mechanical chest wall (CW) properties are related to those of the CW as a whole, we measured esophageal and gastric pressures, CW volume changes (measured with a head-out body plethysmograph), and anteroposterior and transverse CW diameter changes (measured with magnetometers attached to the surface) during sinusoidal forcing at the(More)
The log files of MCW HealthLink web site were analyzed to study users' needs for consumer health information and get a better understanding of the health topics users are searching for, the paths users usually take to find consumer health information and the way to improve search effectiveness. Introduction HealthLink (http://healthlink.mcw.eduf), a(More)
The purpose of this study was to determine whether the level of influenza in a population correlates with the number of times that internet users access information about influenza on health-related Web sites. We obtained Web access logs from the Healthlink Web site. Web access logs contain information about the user and the information the user accessed,(More)
STUDY OBJECTIVE To test whether the Trendelenburg ("head-down") or reverse Trendelenburg ("head-up") postures change lung and chest wall mechanical properties in a clinical condition. DESIGN Unblinded study, each patient serving as own control. SETTING University of Maryland at Baltimore Hospital, Baltimore, Maryland. PATIENTS 15 patients scheduled(More)
Endobronchial insufflation of oxygen offers possible advantages over conventional ventilation modes in some clinical situations in which nonmovement of the chest may be desirable; however, endobronchial insufflation of oxygen has yet to be used during thoracic surgery in humans. Furthermore, the physiologic mechanisms underlying gas exchange during(More)
STUDY OBJECTIVE To test whether split torso positioning, abdominal insufflation, and other procedures performed during laparoscopic nephrectomy would affect mechanical impedances to inflation [i.e., elastance (E) and resistance (R) of the total respiratory system (Ers, and Rrs), lungs (EL and RL), and chest wall (Ecw and Rcw)] differently from previously(More)
From measurements of airway and esophageal pressures and flow, we calculated the elastance and resistance of the total respiratory system (Ers and Rrs), chest wall (Ecw and Rcw), and lungs (EL and RL) in 11 anesthetized-paralyzed patients immediately before cardiac surgery with cardiopulmonary bypass and immediately after chest closure at the end of(More)