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Biomedical subjects

O Lind

Publications and source records attributed to O Lind.

At least 19 recordsLinked to original sources
PubMed1992

Teat reactions in cows associated with machine milking.

In the present investigations, referring to conventional milking machines and conventional milking technique, teat ends were transversally compressed for a short moment by means of a cutimeter before, during and after milking (main series), or before and after milking (additional series). The thickness of the teat ends between the jaw plates of the instrument decreased during the high flow-rate phase, increased during the low flow-rate and overmilking phases, and started decreasing as soon as milking was finished. The decreased values in the beginning of the milking process reflect the thinning of the teat wall following the vacuum-induced teat elongation that occurs when the teat cups are attached. The subsequent increased values are due to active, i.e., functionally significant hyperaemia in the teat wall, especially in the specific teat venous system, and locally elevated vascular pressure. Both the thinning and the thickening seem to occur within physiologically tolerable limits. The diagnosis, proposed in the literature, of teat congestion (passive hyperaemia) and/or oedema involving risks of impaired teat and udder health has no support in our investigations.

Animals↗
PubMed1992

Spontaneous otoacoustic emissions. Short-time stability.

We have examined 307 spontaneous otoacoustic emissions (SOAEs) from 59 ears. The short-time amplitude stability was very good, especially in the high-frequency region. A statistically significant trend for emissions to influence other emissions could not be demonstrated.

Acoustics↗
PubMed1991

[Laryngocele].

We report the cases of five patients with laryngocele. In every case the diagnosis was made by computerized tomography. The laryngocele was internal in two cases, external in one case and combined in the rest. One of the patients had bilateral laryngoceles. The value of CT in the diagnosis is stressed, and it is recommended that this radiologic examination (or MRI) should be performed in patients with otherwise unexplained long-standing hoarseness and attacks of stridorous respiration.

Aged↗
PubMed1990

Spontaneous otoacoustic emissions: incidence and short-time variability in normal ears.

More than 50% of normal ears generate spontaneous otoacoustic emissions, which are sinusoidal tones originating in the cochlea. These faint sounds with levels typically at 10 dB to -30 dB are usually not recognized by the subjects who have them, but can be recorded by sensitive microphones in the ear canal. The clinical significance of having or not having spontaneous emissions are at present unknown. The emissions may be useful for non-invasive monitoring of cochlear physiology. A total of 307 spontaneous otoacoustic emissions from 59 ears have been examined. The short-time variability was small when as many as 300 averages were collected. High-frequency emissions showed better stability than low-frequency ones. The ratio of frequency distance between neighboring emissions to critical bandwidth (Bark) was preferentially 0.3-0.5 for lower frequencies and 0.2-0.4 for the higher ones. Amplitude dependence for one emission on its neighbors was difficult to demonstrate. Combination tones (different tones f2-f1 and the cubic distortion product 2 x f1-f2) are probably rare among spontaneous emissions.

Acoustics↗
PubMed1989

[Non-organic hearing loss].

Non-organic hearing loss is a condition which must be considered if there is a discrepancy between audiometry and the patient's ability to communicate. Several methods are available for evaluating these patients. In recent years electrophysiological methods have been very useful. We describe eight patients with NOHL, in whom we have found several common characteristics. In most cases the condition recovers spontaneously. Major psychological and social maladjustments have to be excluded. Organic hearing impairment concealed by non-organic hearing loss must not be overlooked.

Audiometry↗
PubMed1989

Immediate neurological effects of diving to a depth of 360 metres.

Eighteen divers performed a simulated dive to a depth of 360 metres of seawater breathing a mixture of helium and oxygen. Clinical neurological examinations and neurophysiological tests were performed before and after the dives. Two divers had mild ataxic signs and changed electronystagmography after the dive, and one had impaired vibration sense in one lower extremity. Abnormal EEGs with slow waves and sharp potentials, seen primarily in the temporal regions, occurred in 2 divers. No changes were found in the magnetic resonance imaging brain scans. The divers with evidence of previous central nervous system injury, or a history of unconsciousness or previous decompression sickness seemed more likely to develop neurological signs after these deep dives. This study shows that deep diving may induce immediate neurological changes. We recommend that future deep divers have a neurological examination and 2 separate EEGs included in their medical examinations.

Adult↗
PubMed1989

Evoked acoustic emissions in high-frequency vs. low/medium-frequency hearing loss.

Evoked otoacoustic emissions have been recorded from ears with high- and low/medium-frequency hearing losses using a simple technique with fixed stimulus intensity and no suppression of stimulus artifact. Ears with low/medium frequency hearing loss exceeding 40 dB HL generate responses ending before 17.5 ms after stimulus onset. This may be used for testing of low/medium frequency hearing in ears where BRA indicates normal or only slightly impaired high-frequency hearing. Interrelationships between various response parameters and hearing losses have not been demonstrated statistically.

Diagnosis, Differential↗
PubMed1987

[Tracheotomy].

Explore the source record for details and available documents.

Adolescent↗
PubMed1986

Deafness after treatment with ear drops containing neomycin, gramicidin and dexamethasone. A case report.

We describe a patient with a polyethylene tube to the middle ear who developed severe deafness and vertigo after treatment with ear drops where neomycin B was considered to be the most likely offending agent. High concentration of this antibiotic in the ear drops and access of the solution to the round window membrane in the absence of inflammatory edema and secretion may have been significant factors contributing to this serious side effect. Less ototoxic preparations should be used in patients with perforated tympanic membranes or grommets.

Deafness↗
PubMed1986

Unilateral sensorineural hearing loss in children less than 15 years of age.

1-10 years after the first examination, 56 children below 15 years of age with unilateral sensorineural hearing loss were re-examined with a test-battery consisting of puretone and speech audiometry, stapedius reflex tests, caloric tests, brainstem response audiometry and otoneurological tests. In no case was an acoustic tumour suspected on the basis of the test results. A small progression of the hearing loss occurred in only one ear. In no case did the healthy ears develop hearing loss during the observation period. Diagnostic procedures can in most of such cases be limited to pure-tone audiometry. Follow-up is indicated because some patients require advice considering education and evaluation regarding fitting of a hearing aid.

Adolescent↗