TY - JOUR
T1 - Assessment of cardiac vagal activity in patients with hyperthyroidism
AU - Pitzalis, Maria Vittoria
AU - Mastropasqua, Filippo
AU - Massari, Francesco
AU - Ciampolillo, Anna
AU - Passantino, Andrea
AU - Ognissanti, Matteo
AU - Mannarini, Antonella
AU - Zanna, Domenico
AU - Giorgino, Riccardo
AU - Rizzon, Paolo
PY - 1998/4/1
Y1 - 1998/4/1
N2 - Previous studies suggested that in patients with hyperthyroidism an autonomic imbalance and in particular a lower than normal vagal activity might be present. To verify this hypothesis we have evaluated the respiratory sinus arrhythmia (RSA, a measure of cardiac vagal activity) in ten hyperthyroid patients and in ten normal subjects. RSA was calculated from the power of the spectral component of the heart rate variability in high frequency band (HF-RR) during both spontaneous (supine and passive head-up tilt) and controlled breathing (supine). During controlled breathing the phase relation between heart rate and respiratory has been computed. The hyperthyroid patients showed a higher heart rate in all three conditions (P
AB - Previous studies suggested that in patients with hyperthyroidism an autonomic imbalance and in particular a lower than normal vagal activity might be present. To verify this hypothesis we have evaluated the respiratory sinus arrhythmia (RSA, a measure of cardiac vagal activity) in ten hyperthyroid patients and in ten normal subjects. RSA was calculated from the power of the spectral component of the heart rate variability in high frequency band (HF-RR) during both spontaneous (supine and passive head-up tilt) and controlled breathing (supine). During controlled breathing the phase relation between heart rate and respiratory has been computed. The hyperthyroid patients showed a higher heart rate in all three conditions (P
KW - Heart rate variability
KW - Hyperthyroidism
KW - Respiratory sinus arrhythmia
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U2 - 10.1016/S0167-5273(98)00024-2
DO - 10.1016/S0167-5273(98)00024-2
M3 - Article
C2 - 9688433
AN - SCOPUS:0032051880
VL - 64
SP - 145
EP - 151
JO - International Journal of Cardiology
JF - International Journal of Cardiology
SN - 0167-5273
IS - 2
ER -