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Biomedical subjects

F Thomsen

Publications and source records attributed to F Thomsen.

At least 19 recordsLinked to original sources
PubMed2001

Characteristics of whistles from the acoustic repertoire of resident killer whales (Orcinus orca) off Vancouver Island, British Columbia.

The acoustic repertoire of killer whales (Orcinus orca) consists of pulsed calls and tonal sounds, called whistles. Although previous studies gave information on whistle parameters, no study has presented a detailed quantitative characterization of whistles from wild killer whales. Thus an interpretation of possible functions of whistles in killer whale underwater communication has been impossible so far. In this study acoustic parameters of whistles from groups of individually known killer whales were measured. Observations in the field indicate that whistles are close-range signals. The majority of whistles (90%) were tones with several harmonics with the main energy concentrated in the fundamental. The remainder were tones with enhanced second or higher harmonics and tones without harmonics. Whistles had an average bandwidth of 4.5 kHz, an average dominant frequency of 8.3 kHz, and an average duration of 1.8 s. The number of frequency modulations per whistle ranged between 0 and 71. The study indicates that whistles in wild killer whales serve a different function than whistles of other delphinids. Their structure makes whistles of killer whales suitable to function as close-range motivational sounds.

Acoustics↗
PubMed2000

Failure of total hip arthroplasty with Boneloc bone cement.

Early failure of Boneloc cemented total hip arthroplasty is well documented. However, information regarding the long term prognosis is scanty. The aim of this study was therefore to assess the long term failure rate of total hip replacement with Boneloc bone cement. Between January 1991 and March 1992, Boneloc bone cement (Polymers Recontructive A/S, Farum, Denmark) was used in 42 consecutive total hip replacements in 42 patients. The average age of the patients was 75 years. There were 25 women and 17 men. The diagnosis at operation was osteoarthritis in all cases. A cemented Muller Taperloc femoral stem was used with a cemented Muller acetabular cup (Biomet, Warsaw, USA). The follow-up time was 9 years. All patients underwent radiographic control the first postoperative year and annually after 1995. To date 21 patients have been revised for aseptic loosening at a mean of 5 years (range: one year to 8 years). Three other patients have definite radiographic evidence of loosening. The overall failure rate is therefore 24/42 = 57%. Our results confirm the previously reported poor results of Boneloc bone cement for hip arthroplasty and support the recommendation of indefinite follow-up for surviving prostheses. New prosthesis designs and new cements should have documentation, including laboratory tests and randomized clinical studies with radiostereometric evaluation. However, the ethical responsibility rests heavily on the shoulders of the clinician to make a correct analysis of the need for a new product before he begins to use it.

Aged↗
PubMed1997

Percutaneous sclerotherapy of hydronephrosis in a non-functioning kidney.

A 27-year-old woman was admitted with an abdominal mass in the right hypochondrium. Ultrasound, intravenous urography and scintigraphy revealed a giant non-functioning hydronephrosis. Because she refused surgery, a percutaneous aspiration with instillation of doxycycline was performed. One year thereafter, the patient was still without recurrence of any symptoms or hydronephrosis.

Adult↗
PubMed1995

[Aortic dissection demonstrated by ultrasound scanning].

The clinical features of aortic dissection may be nonspecific and confusing. Three patients with different symptomatology diagnosed primarily by ultrasound are reported. In all cases the dissection was confirmed by dynamic CT and arteriography. The sonographic characteristics of aortic dissection are briefly described.

Aged↗
PubMed1994

Operative treatment of clavicular nonunion.

Twelve patients treated for clavicular nonunion mainly with plate fixation and bone grafting were reviewed in order to evaluate the treatment. Follow-up was a median of 41 months (20-117). Nine out of 12 patients achieved a good end result, but the primary treatment failed in half of the cases, probably because of short (4-hole) semitubular plates and insufficient postoperative immobilization. We conclude that 4-hole semitubular plates cannot be recommended for treating clavicular nonunion because of a high risk of failure. Sufficient postoperative immobilization should follow plate fixation. If this is respected, plate fixation with bone grafting appears as a good method for treating clavicular nonunion.

Adult↗
PubMed1994

[Computed tomographic detection of air in the portal vein--a case report].

Two cases of portal venous gas (PVG) are presented. One case due to bowel infarction and another due to duodenal ulcer perforation complicated by a subphrenic abscess. The diagnosis was suggested from plain abdominal radiographs and confirmed by unenhanced computed tomography (CT) of the abdomen which is superior to demonstrate gas in the portal venous system. The distinction between PVG and biliary gas is briefly discussed.

Aged↗
PubMed1993

[Conservative treatment of clavicular fractures].

The outcome of 99 clavicular fractures was examined retrospectively through a questionnaire and, in 20 cases, clinical examination. Primary treatment was in all cases a simple sling or a figure of eight bandage. The aim of the study was to examine prognostic factors in relation to the end-result. The fractures were classified, according to the roentgenograms, and the primary dislocation, primary shortening and secondary shortening of the shoulder were recorded. The end-result was expressed as the degree of pain. Statistically significantly more patients with group two type two fractures had a poor result. No other prognostic factors were found.

Adolescent↗
PubMed1986

Hippuran renography and scintigraphy in children with myelomeningocele.

Long-term surveillance of the urinary tract is necessary in children with myelomeningocele and neurogenic bladder dysfunction. The results of Hippuran renography and scintigraphy were analyzed in 52 cases and compared to those of intravenous urography. In addition the radionuclide evaluation was correlated to the clinical course. It was concluded that renography is a suitable examination for the monitoring of the kidneys and upper urinary tract in these children. A decrease of renal function and drainage may occur without any changes of the clinical state.

Child↗
PubMed1981

Cimetidine treatment of patients with duodenal ulcer referred to a surgical clinic.

Fifty-seven patients with gastroscopically verified duodenal ulcer after being referred to a surgical department were treated with one gram of cimetidine daily for 4 weeks. Within the period of observation 6-16 months (median 9) there was indication for operation in 36 patients, 16 were free from symptoms and five had slight symptoms. Those with freedom from symptoms over a longer period all had gastroscopically verified ulcer healing at control gastroscopy following discontinuation of the treatment. Ulcers localized to the pyloric/pre-pyloric areas had a poorer symptomatic effect of treatment than those situated to the bulb.

Adult↗
PubMed1980

Cimetidine treatment of recurrent ulcer after vagotomy.

A retrospective evaluation of 16 patients with recurrent ulcer following vagotomy demonstrated that 75% were free from symptoms, and 40% had a healed ulcer after one month of cimetidine treatment (one gram per day). The ulcer recurrence, respectively persistance rate was high. After a median observation time of nine months, four patients were continuously free from symptoms, ten had been subjected to reoperation (of these two after an attempt at long-term treatment with cimetidine) and two were under long-term treatment with cimetidine. With the present state of knowledge an attempt can be made to treat the patients with recurrent ulcers after vagotomy with a cure of two to three months. Acid tests and control gastroscopy has some predictive value.

Adult↗