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Spontaneous vs nitroglycerin-induced vasovagal reflex on head-up tilt : Are there neuroendocrine differences?

Nilsson, David LU ; Sutton, Richard; Melander, Olle LU and Fedorowski, Artur LU (2016) In Heart Rhythm 13(8). p.1674-1678
Abstract

Background Head-up tilt test (HUT) has been used for nearly 30 years for diagnosing vasovagal syncope (VVS) and was enhanced by sublingual nitroglycerin (glyceryl trinitrate [GTN]) challenge in the 1990s. Objective The purpose of this study was to explore neuroendocrine differences between spontaneous and drug-induced HUT positivity. Methods Two hundred eighty-eight patients (41.3% male, age 49 ± 21 years) with either positive passive (n = 60 [20.8%], age 38 ± 17 years) or GTN-enhanced HUT (n = 228, age 51 ± 21 years) were assessed. Beat-to-beat hemodynamic data, plasma epinephrine, plasma norepinephrine, plasma renin, C-terminal pro-arginine vasopressin (CT-proAVP), C-terminal endothelin-1, and mid-regional fragment of pro–atrial... (More)

Background Head-up tilt test (HUT) has been used for nearly 30 years for diagnosing vasovagal syncope (VVS) and was enhanced by sublingual nitroglycerin (glyceryl trinitrate [GTN]) challenge in the 1990s. Objective The purpose of this study was to explore neuroendocrine differences between spontaneous and drug-induced HUT positivity. Methods Two hundred eighty-eight patients (41.3% male, age 49 ± 21 years) with either positive passive (n = 60 [20.8%], age 38 ± 17 years) or GTN-enhanced HUT (n = 228, age 51 ± 21 years) were assessed. Beat-to-beat hemodynamic data, plasma epinephrine, plasma norepinephrine, plasma renin, C-terminal pro-arginine vasopressin (CT-proAVP), C-terminal endothelin-1, and mid-regional fragment of pro–atrial natriuretic peptide were measured resting supine and after 3 minutes of HUT. In multivariate–adjusted regression analyses controlling for age and gender, clinical, neuroendocrine, and hemodynamic parameters were compared between spontaneous and GTN-mediated positive tests. Results Patients with spontaneous VVS reported more syncope compared to those with GTN-mediated VVS (median interquartile range 6 [17] vs 4 [6], P = .002). There was no difference in resting concentrations of neurohormones between the 2 groups. However, after 3 minutes of HUT, those who later developed spontaneous VVS demonstrated higher levels of CT-proAVP (59.5 ± 137 vs 6.9 ± 4.6, P <0.001) and epinephrine (0.57 ± 1.43 vs 0.23 ± 0.19, P = .003), and lower blood pressure (119/73 vs 139/81 mm Hg, P <.001). Asystole during VVS was more common in the spontaneous VVS group (35% vs 17.5%, P = .016). Conclusion Patients with spontaneous VVS on HUT reported more syncopal events than those with drug-potentiated positive HUT, but both groups shared similar supine neuroendocrine profiles. However, spontaneous VVS during HUT is characterized by lower blood pressure, pronounced increases in epinephrine and vasopressin during early HUT phase, and higher frequency of reflex asystole.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Catecholamine, Head-up tilt test, Neurohormone, vasopressin, Vasovagal syncope
in
Heart Rhythm
volume
13
issue
8
pages
5 pages
publisher
Elsevier
external identifiers
  • scopus:84991517854
  • wos:000380212500015
ISSN
1547-5271
DOI
10.1016/j.hrthm.2016.03.018
language
English
LU publication?
yes
id
93d5c4d3-3bf5-4fd9-a7cb-4c2c019b9adb
date added to LUP
2016-11-04 11:01:03
date last changed
2017-08-01 09:06:25
@article{93d5c4d3-3bf5-4fd9-a7cb-4c2c019b9adb,
  abstract     = {<p>Background Head-up tilt test (HUT) has been used for nearly 30 years for diagnosing vasovagal syncope (VVS) and was enhanced by sublingual nitroglycerin (glyceryl trinitrate [GTN]) challenge in the 1990s. Objective The purpose of this study was to explore neuroendocrine differences between spontaneous and drug-induced HUT positivity. Methods Two hundred eighty-eight patients (41.3% male, age 49 ± 21 years) with either positive passive (n = 60 [20.8%], age 38 ± 17 years) or GTN-enhanced HUT (n = 228, age 51 ± 21 years) were assessed. Beat-to-beat hemodynamic data, plasma epinephrine, plasma norepinephrine, plasma renin, C-terminal pro-arginine vasopressin (CT-proAVP), C-terminal endothelin-1, and mid-regional fragment of pro–atrial natriuretic peptide were measured resting supine and after 3 minutes of HUT. In multivariate–adjusted regression analyses controlling for age and gender, clinical, neuroendocrine, and hemodynamic parameters were compared between spontaneous and GTN-mediated positive tests. Results Patients with spontaneous VVS reported more syncope compared to those with GTN-mediated VVS (median interquartile range 6 [17] vs 4 [6], P = .002). There was no difference in resting concentrations of neurohormones between the 2 groups. However, after 3 minutes of HUT, those who later developed spontaneous VVS demonstrated higher levels of CT-proAVP (59.5 ± 137 vs 6.9 ± 4.6, P &lt;0.001) and epinephrine (0.57 ± 1.43 vs 0.23 ± 0.19, P = .003), and lower blood pressure (119/73 vs 139/81 mm Hg, P &lt;.001). Asystole during VVS was more common in the spontaneous VVS group (35% vs 17.5%, P = .016). Conclusion Patients with spontaneous VVS on HUT reported more syncopal events than those with drug-potentiated positive HUT, but both groups shared similar supine neuroendocrine profiles. However, spontaneous VVS during HUT is characterized by lower blood pressure, pronounced increases in epinephrine and vasopressin during early HUT phase, and higher frequency of reflex asystole.</p>},
  author       = {Nilsson, David and Sutton, Richard and Melander, Olle and Fedorowski, Artur},
  issn         = {1547-5271},
  keyword      = {Catecholamine,Head-up tilt test,Neurohormone,vasopressin,Vasovagal syncope},
  language     = {eng},
  month        = {08},
  number       = {8},
  pages        = {1674--1678},
  publisher    = {Elsevier},
  series       = {Heart Rhythm},
  title        = {Spontaneous vs nitroglycerin-induced vasovagal reflex on head-up tilt : Are there neuroendocrine differences?},
  url          = {http://dx.doi.org/10.1016/j.hrthm.2016.03.018},
  volume       = {13},
  year         = {2016},
}