Normal Respiratory Rate in Adults: Understanding Minute Ventilation
The typical resting respiratory rate for healthy adults is 12–15 breaths per minute. This yields a minute ventilation of ~6–8 L/min (tidal volume ~500 mL).
Factors Influencing Rate:
- Age: Children breathe faster (infants 30–60; adolescents 12–20).
- Activity: Exercise increases rate and depth.
- Health status: Fever, pain, anxiety, acidosis, heart/lung disease elevate rate.
- Medications: Opioids, sedatives depress; stimulants increase.
Clinical Note: Rate alone is insufficient; assess depth, pattern, effort, and oxygen saturation. Abnormal rates warrant investigation.
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