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TITLE:
Variability of near-fainting responses in healthy
6-16-year-old subjects.
AUTHOR:
de Jong-de Vos van Steenwijk CC; Wieling W; Harms
MP; Wesseling KH
AUTHOR AFFILIATION:
University Hospital for Children and Youth, het
Wilhelmina Kinderziekenhuis, Utrecht, The Netherlands.
SOURCE:
Clin Sci (Colch) 1997 Sep;93(3):205-11
NLM CIT. ID:
97478973
ABSTRACT:
1. Fainting is a common phenomenon in young
subjects, but the final events before the actual faint are not well known. The aim of the
present study was to study the inter-individual variability of haemodynamic events
associated with near-fainting in children and teenagers. 2. Sixty-eight healthy subjects
(aged 6-16 years) performed a 70 degrees tilt-up test with intravascular instrumentation
for 5 min. Responses in 29 near-fainting subjects were analysed and compared with 39
non-fainting subjects. Arterial pressure was measured by Finapres. Left ventricular stroke
volume was computed from the pressure pulsation waveform. 3. Inability to maintain
vasomotor tone was the mechanism underlying near-fainting in the vast majority of
near-fainting subjects. The three classical haemodynamic responses (vasovagal,
vasodepressor and vagal) could be recognized, but large individual differences were found.
After tilt back, blood pressure in near-fainters showed a mirror response to the stage
before tilt-back; blood pressure gradually increased and was normal at 1 min after
tilt-back. 4. The variability in haemodynamic responses on approach of an orthostatic
faint is wide in the young.
Adolescence
Blood Pressure/PHYSIOLOGY
Blood Pressure Monitoring, Ambulatory
Cardiac Output/PHYSIOLOGY
Child
Electrocardiography
Female
Heart Rate/PHYSIOLOGY
Human
Male
Signal Processing, Computer-Assisted
Stroke Volume/PHYSIOLOGY
Tilt-Table Test
Time Factors
Vascular Resistance/PHYSIOLOGY
PUBLICATION TYPES:
JOURNAL ARTICLE
LANGUAGE:
Eng
On Sabbatical!
When my office
lease expired at the end of 2004, I decided to turn it into a
"sabbatical" from my private practice. Many years ago, in my
grandfather's 89th year of life, he told me, "John, it is important
to smell the roses while you can still smell them." His life
gave living a very good reputation. It is also true that the
pursuit of that philosophy required my grandfather to to re-open his
assay office/ore market in Wickenburg, Arizona as a 75-year-old because
he had run a little short of retirement money. Thus, if blessed with his
luck and health, I'll be back.. --jjh
