Respiratory rate (RR) is breaths per minute; tidal volume (TV) is volume per breath. Minute ventilation = RR × TV. Normal resting: 12–20 breaths/min, 400–600ml tidal volume. Increased RR is one of the earliest signs of physiological deterioration.
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Did You Know?
The diaphragm contracts about 20,000 times per day — more than any other skeletal muscle. It is so central to life that diaphragm pacemakers (similar to cardiac pacemakers) are used for patients with high spinal cord injuries.
References
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