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J Pharmacol Sci. 2018 Jun;137(2):177-186. doi: 10.1016/j.jphs.2018.06.009. Epub 2018 Jun 20.

Simultaneous monitoring of mouse respiratory and cardiac rates through a single precordial electrode.

Author information

1
Graduate School of Pharmaceutical Sciences, The University of Tokyo, Tokyo, 113-0033, Japan.
2
Graduate School of Pharmaceutical Sciences, The University of Tokyo, Tokyo, 113-0033, Japan. Electronic address: matsumoto.nobuyoshi.0904@gmail.com.
3
Graduate School of Pharmaceutical Sciences, The University of Tokyo, Tokyo, 113-0033, Japan; Precursory Research for Embryonic Science and Technology, Japan Science and Technology Agency, 4-1-8 Honcho, Kawaguchi, Saitama, 332-0012, Japan.
4
Graduate School of Pharmaceutical Sciences, The University of Tokyo, Tokyo, 113-0033, Japan; Center for Information and Neural Networks, National Institute of Information and Communications Technology, Suita City, Osaka, 565-0871, Japan.

Abstract

Normal respiratory and circulatory functions are crucial for survival. However, conventional methods of monitoring respiration, some of which use sensors inserted into the nasal cavity, may interfere with naïve respiratory rates. In this study, we conducted a single-point measurement of electrocardiograms (ECGs) from the pectoral muscles of anesthetized and waking mice and found low-frequency oscillations in the ECG baseline. Using the fast Fourier transform of simultaneously recorded respiratory signals, we demonstrated that the low-frequency oscillations corresponded to respiratory rhythms. Moreover, the baseline oscillations changed in parallel with the respiratory rhythm when the latter was altered by pharmacological manipulation. We also demonstrated that this method could be combined with in vivo whole-cell patch-clamp recordings from the hippocampus. Thus, we developed a non-invasive form of respirometry in mice. Our recording method using a simple derivation algorithm is applicable to a variety of physiological and pharmacological experiments, providing an experimental platform in studying the mechanisms underlying the interaction of the central nervous system and the peripheral functions.

KEYWORDS:

Electrocardiograms; Local field potentials; Membrane potentials; Olfactory bulb; Respiration

PMID:
30042023
DOI:
10.1016/j.jphs.2018.06.009
[Indexed for MEDLINE]
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