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# Respiratory Rate and Tidal Wave Volume

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Respiratory Rate and Tidal Volume [pic] The total amount of air moved in and out of the lungs each minute (pulmonary ventilation) depends upon 2 factors: size of each breath (tidal volume) and number of breaths/minute (respiratory rate). For example, suppose your tidal volume is 500 mL (0. 5 liters) and you breathe 15 times/minute. Your pulmonary ventilation = 15 breaths/min x 0. 5 L/breath = 7. 5 L/min. Pulmonary Ventilation = (Respiratory rate; breaths per minute) x Pulmonary Ventilation

Remember that some of the lung air is dead space and does not exchange gases and that only air in the alveoli exchanges gases with the blood.

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Air in the pharynx, larynx, trachea, bronchi and bronchioles does not exchange gases. The air to the alveoli = tidal volume – dead space. An average human adult at rest has a tidal volume of around 0. 5 L and a dead space of around 0. 15 liters (~30% of TV). This means that the fresh air to the alveoli is around 0. 35 L (~70% of TV). Total alveolar Ventilation = (Respiratory rate) x (TV – dead space)

Consider a group of patients with the same pulmonary ventilation: |Patient |Tidal Volume |Respiratory Rate |Pulmonary Ventilation |Dead Space |Alveolar Ventilation | |1 |1000ml | |6000mL/min |150mL | | |2 |500ml | |6000mL/min |150mL | | |3 |300ml | |6000mL/min |150mL | | |4 |200ml | |6000mL/min |150mL | | |5 |150ml | |6000mL/min |150mL | | Questions 1.

The nurse forgot to fill in the respiratory rate for each patient. Rather than bother her, you decide to simply calculate this from the other data you have. 2. For each patient, calculate the alveolar ventilation. 3.

If you were monitoring only the pulmonary ventilation you might conclude that these patients were all equally well off. What do the other measures tell you about them? 4. Which of these patients is physically active? Which is likely mostly sedentary? Support your opinion. 5. Which patient(s) would you be concerned about? Why? 6. What might be a cause of the problem in these patients? 7. What might you recommend for these patients? Why? 8. What kinds of things can affect the tidal volume and respiratory rate? Why are they affected by these things? 9. Why is it important for doctors to look at a variety of vital statistics before making a diagnosis?

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