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Clinical usefulness of phase angle as an indicator of muscle wasting and malnutrition in inpatients with cardiovascular diseases
▪ Author : Jun Yokomachi, Taira Fukuda, Yuta Mizushima, Naohiro Nozawa, Hayato Ishizaka, Kazuhisa Matsumoto, Takahiro Kambe, Shohta Inoue, Kaori Nishikawa, Yohei Toyama, Reiko Takahashi, Tomoe Arakawa, Hiroshi Yagi, Suomi Yamaguchi, Yuusuke Ugata, Fumitaka Nakamura, Masashi Sakuma, Shichiro Abe, Hideo Fujita, Takashi Mizushima, Shigeru Toyoda, Toshiaki Nakajima
▪ Keyword : phase angle, extracellular water, sarcopenia, malnutrition, cardiovascular disease
Background and Objectives: Extracellular water is increased in patients
with edema, such as those with chronic heart failure, and it is difficult to
assess skeletal muscle mass with the skeletal muscle mass index when
extracellular water is high. We investigated the relationship between phase
angle and physical function, nutritional indices, and sarcopenia in patients
with cardiovascular diseases, including chronic heart failure. Methods and Study
Design: In 590 patients with cardiovascular diseases (372 men), handgrip strength,
gait speed, and anterior mid-thigh muscle thickness by ultrasound were measured,
and the skeletal muscle mass index, phase angle, and the extracellular water:
total body water ratio were measured with a bioelectrical impedance analyzer,
and presence of sarcopenia was evaluated. Results: Phase angle, but not
the skeletal muscle mass index, was correlated with serum albumin (r = 0.377, p
< 0.001) and hemoglobin values in women. Multivariate regression analysis
showed that at the extracellular water: total body water ratio below 0.4, both
phase angle and skeletal muscle mass index were independent determinants of
handgrip strength and log mid-thigh muscle thickness in men, after adjustment
for age and presence of chronic heart failure. In contrast, for the ratio of
0.4 or greater, after adjustment for age and presence of chronic heart failure,
phase angle was a stronger independent determinant of handgrip strength and log
mid-thigh muscle thickness than the skeletal muscle mass index in men.
Conclusions: Phase angle is a good marker of muscle wasting and
malnutrition in patients with cardiovascular disease, including chronic heart
failure.