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Assessment of chemoreflex sensitivity in free breathing young subjects by correction for respiratory influence.

Abstract：

BACKGROUND:The assessment of autonomic function is an important tool for risk stratification in critically ill patients. Peripheral cardiac chemoreflex sensitivity has been considered a marker for increased risk of sudden cardiac death. In normals, the evaluation of peripheral cardiac chemoreflex sensitivity is performed under controlled breathing conditions during inhalation of hypoxic gas. Since this is poorly tolerated by patients, they are commonly studied under hyperoxic conditions, which are not physiological. METHODS:We studied 20 healthy volunteers who underwent free and controlled breathing of a hypoxic gas mixture (10% O2 in N2) over 5 min. Values of peripheral cardiac chemoreflex sensitivity, corrected for respiratory influence, were compared with the results obtained experimentally under controlled breathing conditions in the same subjects. RESULTS:We found a substantial difference between values obtained during free and controlled breathing (3.64 +/- 0.81 vs. 1.53 +/- 0.32 ms/mmHg, respectively; P < 0.05). After application of a respiratory correction, described and validated in this article, no significant difference was seen for these values (0.89 +/-0.91 vs. 1.53 +/- 0.32 ms/mmHg, P = 0.46). CONCLUSIONS:This approach allows the evaluation of peripheral cardiac chemoreflex sensitivity in free breathing subjects. This correction could improve the assessment of cardiac chemoreflex sensitivity in patients with cardiorespiratory disorders, who find it difficult to control their breathing according to an experimental protocol.

journal_name

Int J Cardiol

journal_title

International journal of cardiology

authors

Schmidt HB,Rauchhaus M,Francis DP,Davies CL,Nuding S,Peschel T,Schmidt DS,Coats AJ,Opitz H,Werdan K

doi

10.1016/s0167-5273(01)00377-1

subject

Has Abstract

pub_date

2001-04-01 00:00:00

pages

157-65

issue

2

eissn

0167-5273

issn

1874-1754

pii

S0167527301003771

journal_volume

78

pub_type

临床试验,杂志文章

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