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Cost-effectiveness of laparoscopic cholecystectomy (1995)

McKellar, D. P. ; Johnson, R. M. ; Dutro, J. A. ; [et al.]

Springer

Surgical endoscopy and other interventional techniques 9 (1995), S. 158-163

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ISSN: 1432-2218

Keywords: Laparoscopic cholecystectomy ; Cholecystectomy ; Cost-effectiveness

Source: Springer Online Journal Archives 1860-2000

Topics: Medicine

Notes: Abstract This study retrospectively evaluated the cost-effectiveness of laparoscopic cholecystectomy compared to open cholecystectomy in a single university-affiliated community hospital. The medical records of all patients that underwent laparoscopic cholecystectomy during 1990 and open cholecystectomy during 1989 in one hospital were reviewed. Hospital stay, hospital charges, surgeons' and anesthesiologists' fees were determined. Fifty patients from each group were contacted to determine recovery time to full activity after surgery. Those having common duct exploration and those converted to open cholecystectomy after an attempted laparoscopic cholecystectomy (n=8) were excluded. A summary of results is included below (Table 1). In our early experience with laparoscopic cholecystectomy we found that the total charges for laparoscopic cholecystectomy were more than for open cholecystectomy when one recognizes the 1-year difference in patient accrual between the two groups. Time to full recovery was markedly reduced in patients undergoing laparoscopic cholecystectomy compared to those having an open procedure. Despite the overall increased total charge with laparoscopic cholecystectomy, the shorter recovery period allowing the patients an earlier return to full preoperative activities contributes to its cost-effectiveness when compared to open cholecystectomy. Further experience with laparoscopic cholecystectomy and refinements in management of these patients should allow for further reductions in charges for this procedure.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00191958

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Measurement of small mechanical vibrations of brain tissue exposed to extremely-low-frequency electric fields (1986)

Spiegel, R. J. ; Ali, J. S. ; Peoples, J. F. ; [et al.]

New York, NY [u.a.] : Wiley-Blackwell

Bioelectromagnetics 7 (1986), S. 295-306

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ISSN: 0197-8462

Keywords: mechanical vibration ; electrostrictive force ; flectric field ; brain tissue ; extremely low frequencies ; Life and Medical Sciences ; Occupational Health and Environmental Toxicology

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Biology , Physics

Notes: Electromagnetic fields can interact with biological tissue both electrically and mechanically. This study investigated the mechanical interaction between brain tissue and an extremely-low-frequency (ELF) electric field by measuring the resultant vibrational amplitude. The exposure cell is a section of X-band waveguide that was modified by the addition of a center conductor to form a small TEM cell within the waveguide structure. The ELF signal is applied to the center conductor of the TEM cell. The applied ELF electric field generates an electrostrictive force on the surface of the brain tissue. This force causes the tissue to vibrate at a frequency equal to twice the frequency of the applied sinusoidal signal. An X-band signal is fed through the waveguide, scattered by the vibrating sample, and detected by a phase-sensitive receiver. Using a time-averaging spectrum analyzer, a vibration sensitivity of approximately 0.2 nmp-p can be achieved. The amplitude of the brain tissue vibrational response is constant for vibrational frequencies below 50 Hz; between 50 and 200 Hz resonant phenomena were observed; and above 200 Hz the amplitude fall-off is rapid.

Additional Material: 8 Ill.