Biomedical subjects

M Koenderink

Publications and source records attributed to M Koenderink.

4 recordsLinked to original sources

PubMed1992

Non-invasive assessment of autonomic nervous function in Gilles de la Tourette syndrome.

Autonomic nervous function was investigated in 18 Gilles de la Tourette (GTS) patients and in 23 controls, who matched the patients in age, sex, baseline blood pressure and baseline heart rate. Four heart rate tests were used (variation at rest, during deep breathing, following standing up and during a Valsalva manoeuvre), and two blood pressure tests (standing up and sustained handgrip). The only significant difference between the groups was found in the Valsalva test. This was due to the initial heart rate increase which was higher in the GTS group; the subsequent decrease did not differ between the groups. Increased sympathetic activity is a possible explanation for this finding, but no additional evidence in its favour was found. No signs of autonomic failure were found.

Adolescent↗

PubMed1991

Autonomic nervous function in progressive supranuclear palsy.

Autonomic nervous function was assessed in 11 patients with progressive supranuclear palsy, 26 patients with Parkinson's disease, matched for age, medications, disease severity, and disease duration, and 19 age-matched controls. Results of both parasympathetic (heart rate response to deep breathing and Valsalva maneuver) and sympathetic (blood pressure decrease on standing and increase on sustained handgrip) tests were abnormal in both patient groups. Abnormalities in the group of patients with progressive supranuclear palsy were similar to those in the group with Parkinson's disease but were more pronounced. Autonomic dysfunction may have to be considered a feature of progressive supranuclear palsy.

Aged↗

PubMed1991

Long-term EEG monitoring in the early premature: developmental and chronobiological aspects.

Long-term cassette EEG monitoring in the neonatal intensive care unit has established prognostic criteria regarding the developmental outcome by quantifying seizure activity. The clinical significance of the organization of continuous and discontinuous EEG patterns in the early premature is still an open question. This report presents quantified EEG data from repeated 24 h records during the first week of life in premature infants (conceptional age less than 32 weeks) with and without ultrasound evidence of intracerebral hemorrhage. The repartition and evolution of EEG background activity is not a reliable parameter regarding pathology. The continuity index is rather a maturational variable and its ultradian fluctuation is an early expression of the "basic rest activity cycle" (BRAC) rhythm.

Aging↗

PubMed1991

Autonomic nervous system tests depend on resting heart rate and blood pressure.

In order to study the effects of baseline blood pressure and heart frequency on autonomic function tests, 75 normal subjects (aged 8-96 years) were investigated. Heart rate variability was studied at rest, during deep breathing, following standing up and during a Valsalva manoeuvre. Blood pressure changes were recorded during standing up and during sustained handgrip. Responses were described as ratios and as differences to study the efficacy of both methods. Multiple regression analysis showed that significant relationships with the resting heart rate existed for ratios but not for differences. The blood pressure rise in the sustained handgrip test showed a significant relationship with resting blood pressure regardless of the description method. As expected, relationships with age existed for all four heart rate tests regardless of the description method. The blood pressure responses were not significantly related to age. We advise that heart rate test results should be presented as differences, as this avoids the need for correction for the resting heart rate. Correction for the resting blood pressure improves the accuracy of the standing up blood pressure test. Correction for age remains necessary for heart rate tests but not for blood pressure tests.

Adolescent↗