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Biomedical subjects

O Lund

Publications and source records attributed to O Lund.

94 records · Page 6Linked to original sources
PubMed1986

Left ventricular ejection fraction determined with the nuclear stethoscope, gamma camera and contrast ventriculography.

Left ventricular ejection fractions (EF) were measured with a nuclear stethoscope (NSt, beat-to-beat and ECG gated summation method) and contrast ventriculography (VG) immediately following one another (IFOA) (r X 0.96 and 0.95, respectively, n = 13). NSt and ECG gated gamma camera (MUGA) recordings IFOA were compared (r = 0.97 and 0.96, respectively, n = 23) as were non-IFOA recordings (r = 0.90 and 0.91, respectively, n = 13). Correlation between repeated NSt EF measurements gave: r = 0.91 (n = 22) for both methods. Paired NSt recordings in an invasive test situation (during invasive angiocardiography) and in a noninvasive situation (supine, 30 min of rest) gave for patients with EF less than 50 (mean +/- S.D.): EF invasive = 36 +/- 12, EF noninvasive = 41 +/- 13 (n = 4, p less than 0.05), and for patients with EF greater than or equal to 50: EF invasive = 59 +/- 7, EF noninvasive = 57 +/- 7 (n = 9, N.S.). The mean paired differences (EF noninvasive -EF invasive) in the low (less than 50) and high (greater than or equal to 50) EF range differed significantly: +5.3 versus -1.3, respectively (p less than 0.001). The recordings with the ECG-gated summation method gave similar results. The heart rate (beats min-1) in the noninvasive and invasive situation were (mean +/- S.D.): 68 +/- 11 and 78 +/- 16, respectively (p less than 0.01). We conclude that the patients were in a higher level of stress in the invasive situation. Accordingly ventricles with normal contractility (EF greater than or equal to 50) reacted with a slight increase in EF, and ventricles with compromised function (EF less than 50) reacted with a decrease in EF, compared to the values in the noninvasive situation. Incorporated in a correlation between MUGA and VG are, besides methodologically based differences, test-situation based systematical differences. Consequently the results of MUGA method should be given uncorrected. The results documents the accuracy and reliability of the NSt.

Adolescent↗
PubMed1979

Binaural hearing spectacles with "no mould" by acoustic trauma.

Patients with selective hearing loss in the trebles, as commonly seen in acoustic trauma, often have a considerable hearing handicap. They seldom benefit from the usual hearing aids with closed ear moulds. When Ewertsen (1970) and Cortois (1972) reported their experiences with binaural fitting of hearing spectacles, using a free plastic tube in the ear canal ("no mould"), we at the Hearing Centre in Namsos began to fit such hearing aids to 33 patients with acoustic traumas. All of them were followed-up in February--March 1978. The results have been evaluated on the basis of answers from the patients entered on questionnaires, and speech audiometry in open field, monosyllable, with 60 dB wide-band background noise. 27 patients (80%) stated that they were greatly satisfied, and 7 (20%) well satisfied. The average daily use was 4 1/2 hrs. All of the patients emphasized the great benefit obtained with the hearing aid at conferences, meetings, social occasions, etc. The average hearing gain was 13 dB. Among those who had discrimination loss there was an average gain of 30% .

Adult↗
PubMedDate not supplied

Acute or delayed surgical treatment of traumatic rupture of the descending aorta.

During a 20 year period, 33 patients with traumatic rupture of the descending thoracic aorta were operated upon. In the absence of an indication for acute surgery our policy was to defer operation at least 4 weeks after the trauma. Six patients were operated upon within 24 hours (Group I), 5 after 4-13 days due to suspected expansion of mediastinal widening (Group IIa), 10 were operated upon electively after 4-12 weeks (Group IIb), and 12 were operated upon for chronic traumatic aneurysms (Group III). The number of operative deaths/reoperations due to bleeding were: Group I, 2/1; Group IIa, 1/2; Group IIb, 0/0; and Group III, 1/0. There were no late deaths related to the operation or the inserted prosthesis. Of 26 survivors, 21 underwent a follow-up study 1.5-20 years (mean 8.2 years) postoperatively. Except for 6 patients with paralysis of the left recurrent laryngeal nerve none of the patients had sequelae which could be related to the operation or the inserted prosthesis. CT-scanning of the chest revealed neither pseudoaneurysms nor significant stenosis in the suture lines or prosthetic areas. The results indicate that delayed operation of traumatic thoracic aortic ruptures on selected patients may be performed with acceptable results.

Adult↗