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Fig. 3 | Bioelectronic Medicine

Fig. 3

From: The brain–heart-immune axis: a vago-centric framework for predicting and enhancing resilient recovery in older surgery patients

Fig. 3

Standard deviation of normal R-R intervals (SDNN) is one of many measures of heart rate variability. SDNN, illustrated here, is sometimes used because it is easy to comprehend. HRV measures have cardiovascular physiological interpretations and are widely considered to be good indicators of vagal tone. More detail is presented in the text

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Bioelectronic Medicine

ISSN: 2332-8886