Slow Pulse

Quality & Sensation

Fewer than four beats per respiratory cycle of the practitioner (approximately fewer than 60 beats per minute). Feels unhurried, with a leisurely rhythm.

About the Slow Pulse

The Slow pulse (Chi Mai) beats at a rate of fewer than four beats per practitioner breath cycle, corresponding roughly to fewer than sixty beats per minute in biomedical terms. Its rhythm is regular but unhurried, as though the blood is moving through the vessels with reluctance. The sensation under the fingers is one of deficiency of motive force -- the pulse arrives, pauses slightly longer than expected, then arrives again, each beat carrying less urgency than a normal pulse.

In the theoretical framework of Chinese medicine, the speed of the pulse directly reflects the balance between Yin (Cold, stillness, contraction) and Yang (Heat, movement, expansion) in the body. A Slow pulse indicates that Cold has gained predominance, whether through invasion of external Cold pathogen or through internal decline of Yang Qi. The Nan Jing (Classic of Difficulties) states that slowness in the pulse corresponds to Cold in the viscera, and that the more pronounced the slowness, the deeper and more established the Cold pattern.

Clinically, the Slow pulse is most commonly encountered in patients with Yang deficiency syndromes -- particularly Spleen Yang deficiency (poor digestion, loose stools, fatigue, cold abdomen) and Kidney Yang deficiency (cold lower back and knees, frequent pale urination, diminished libido, edema). It is also found in Heart Yang deficiency, which may present with palpitations, chest tightness, and cold sweats. The practitioner must evaluate accompanying signs to determine which organ system's Yang is most affected, as this determines the specific herbal formula and acupuncture point selection.

TCM Pattern & Significance

Cold pattern. May be excess Cold (invasion of pathogenic Cold) or deficiency Cold (Yang Qi deficiency failing to warm and move Blood).

Clinical Significance

The Slow pulse directly reflects insufficient Yang Qi to propel Blood through the vessels with normal vigor. Yang is the warming, activating force in the body, and when it is deficient, all metabolic processes slow down -- digestion, circulation, mental activity, and immune function. The Slow pulse is therefore a systemic indicator that the body's fire is insufficient, and treatment must prioritize warming and tonifying Yang rather than dispersing, draining, or cooling.

Associated Conditions

Yang deficiency (Spleen, Kidney, or Heart Yang), hypothyroidism, bradycardia, chronic fatigue, Cold-Damp Bi syndrome, digestive weakness with undigested food in stool, cold extremities, edema.

Differential Diagnosis

Distinguished from the Moderate (Huan) pulse, which has four beats per breath and represents a healthy, balanced rhythm. Distinguished from the Knotted (Jie) pulse, which is slow but with irregular pauses -- the Slow pulse is regular in rhythm, just reduced in rate. Athletes and long-term meditators may have a constitutionally slow pulse that is not pathological.

Treatment Principle

Warm Yang and dispel Cold. For Spleen Yang deficiency: Li Zhong Wan (Regulate the Middle Pill). For Kidney Yang deficiency: Jin Gui Shen Qi Wan. For Heart Yang deficiency: Gui Zhi Gan Cao Tang. For excess Cold invasion: warm the channels with moxibustion and warming herbs.

Combined Pulse Qualities

Slow and Deep: interior Cold, Yang deficiency of the Kidney or Spleen. Slow and Floating: exterior Cold invasion (early stage). Slow and Tight: severe Cold with pain (Cold-Damp Bi). Slow and Weak: Qi and Yang deficiency with Cold. Slow and Slippery: Cold-Damp with Phlegm accumulation.