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Biomedical subjects

J K Jensen

Publications and source records attributed to J K Jensen.

31 records · Page 2Linked to original sources
PubMed1982

Nonverbal intelligence and English language ability in deaf children.

The relationship between nonverbal intelligence and English language ability in a sample of 25 deaf children between the ages of 6-10 was examined. Intelligence measure included the Performance Scale of the Wechsler Intelligence Scale for Children-Revised (Wechsler, 1974) and the Hiskey-Nebraska Test of Learning Aptitude (Hiskey, 1966). Language measures were the Test of Language Development (Newcomer & Hammill, 1977) and the Reynell Developmental Language Scales (Reynell, 1977). Average correlations of .45 were obtained between nonverbal IQ and the language measures. The average multiple correlation between the individual subtests from the intelligence scales and language scores was .68. Subtests which require visual memory consistently entered the multiple regression equations as the best predictors of language performance. Language performance was attenuated in this sample and did not correlate with chronological age. The finding of significant correlations between nonverbal IQ and English language, in spite of the attenuated language performance, suggests that nonverbal intelligence and visual memory skills, in particular, may be important in understanding the success of some hearing-impaired children in acquiring English and the failure of others.

Child↗
PubMed1980

Blood pressure response to administration of local anaesthetics with noradrenaline in craniotomies.

Infiltration with local anaesthetics with addition of adrenaline or noradrenaline has been used since 1910 prior to skin incision for craniotomy. In a controlled series of patients scheduled for intracranial operations, systemic blood pressure was measured intra-arterially after infiltration with 15-20 ml 0.5% lignocaine with nonradrenaline 1 mu gr/ml. A marked increase in systemic blood pressure was seen (125% of values prior to infiltration). In a control series, where saline was injected, a slight fall in blood pressure was registered (p smaller than 0.01). As hypertensive episodes increase intracranial pressure in patients with impaired cerebral autoregulation, or promote the risk of haemorrhage in aneurysm surgery, this technique is considered a hazard to patients undergoing intracranial operations.

Adult↗
PubMed1979

Cameco anaesthetic ventilator with a modified Mapleson D circuit.

A modified Mapleson D circuit has been used in connection with a Cameco anaesthetic ventilator during neuroradiological procedures in general anaesthesia. In order to increase mobility of the patient, two or three lengths of corrugated rubber tubing were used to connect the patient to the ventilator. Blood gas analysis was carried out in 20 patients after ventilation to steady state with both circuits. The respiratory minute volume and fresh gas flow were preset in Bain's (Bain & Spoerel 1975) predictions. No significant difference could be detected in respect to Paco2 or Po2, whether 2 or 3 lengths of tubing were used. Mean values of Paco2 were higher compared with the results of Bain (0.37 kPa s.d. 0.50). It is concluded that this system gives maximum mobility of the patient during the radiological procedure and offers reliable adjustment of Paco2, even in patients with apparent increase of intracranial pressure.

Adolescent↗
PubMedDate not supplied

Radiology of the continent ileostomy reservoir: I. Method of examination and normal findings.

The aim of the present study is to describe the radiologic methods used to study continent ileostomy reservoirs and to depict the normal radiologic features and variations identified by these procedures. During an 8-year period, 408 double-contrast studies were performed in 261 patients. The present study comprises 170 examinations in 99 patients with normal findings. A high-density barium contrast medium and air were used. Modes variation in the size and shape of the reservoirs was observed. The mucosal pattern of the reservoirs resembled that of the ileum but the folds were slightly wider. The continence-providing valves were 3-5 cm long and had a diameter of 2.5-4.0 cm. The diameter of the afferent ileal segments was usually slightly larger than that of more proximal ileal segments, with an upper limit of approximately 4 cm. The efferent ileal segments generally had a straight course without widening or out-pouches. Retrograde barium double-contrast examination is a satisfactory method for the evaluation of continent ileostomy reservoirs. Here we define the range of normal variations of such reservoirs as seen on retrograde double-contrast radiologic examinations.

Barium Sulfate↗
PubMedDate not supplied

Radiology of the continent ileostomy reservoir: II. Findings in patients with late complications.

During an 8-year period, 238 barium double-contrast studies performed in 162 patients with continent ileostomy reservoirs who had signs and symptoms of late complications (malfunction of the valve, nonspecific inflammation of the mucosa, stenoses, hernias, and fistulas) showed radiologic abnormalities. The aim of the present study is to depict the radiologic findings in patients with late complications of continent ileostomy reservoirs. With radiologic examination, the correct diagnosis of valve malfunction was made in 96% of patients with surgically proven valve defects. We were able to differentiate between various types of valve dysfunction and complications related to the fixation of the reservoir to the abdominal wall. Inflammatory mucosal changes and fistulas of the reservoir and the afferent ileal segment were depicted with a high degree of accuracy. Barium double-contrast radiologic examination proved to be very valuable in the work-up of patients with dysfunction of continent ileostomy reservoirs. The method was of particular value in assessing the cause of valve dysfunction and in the appraisal of the afferent ileal segment.

Barium Sulfate↗
PubMedDate not supplied

Assessment of exposure to EMF in a Danish case-control study of childhood cancer.

In Denmark it is permitted to draw overhead lines across residential areas. In connection with a Danish case-control study we developed a method for estimating the historical values of magnetic fields at residences. The study included 1,707 cases with childhood cancer and 4,788 matched population controls. A total of 16,082 different addresses had been occupied by the families from the time of conception until the date of diagnosis. The values of the extreme, maximum, middle and minimum 50 Hz magnetic field strengths originating from a 50-400 kV high-voltage installation were estimated for each of the dwellings included in a potential exposure area. 30 children were exposed to an average level of magnetic fields of 0.1 microT or more. The evaluated Danish method of exposure assessment was compared with the method for residential wiring codes developed by Wertheimer and Leeper /1/. We concluded that the US wiring codes are inappropriate for use in connection with the Danish electricity transmission system.

Adolescent↗