Respiratory minute volume

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Respiratory minute volume (or minute ventilation, or flow of gas) is the volume of air which can be inhaled (inhaled minute volume) or exhaled (exhaled minute volume) from a person's lungs in one minute. This is normally registered when a person has a ventilator supporting the person's breathing due to a sickness or injury.

Minute volume is calculated by taking the tidal volume and multiplying the respiratory rate (the number of breaths per minute a person is taking). The higher the minute volume the more carbon dioxide (CO₂) the person is releasing, the converse is the lower the minute volume the lower the amount of carbon dioxide the person is releasing. For example a person who is hyperventilating would have an increased minute volume.

A normal minute volume would be 5–8 liters per minute.

The symbol used to represent minute volume is $\dot{V}$ or MV.

[edit] Relationship to other Physiological Rates

Minute volume is closely related to both alveolar ventilation and dead space ventilation. That is;

$\dot{V}) = \dot{V}_A + \dot{V}_D$

Where $\dot{V}_A$ is alveolar ventilation, and $\dot{V}_D$ represents dead space ventilation

[edit] External links

v • d • e Respiratory system, physiology: respiratory physiology

Volumes	lung volumes - vital capacity - functional residual capacity - respiratory minute volume - closing capacity - dead space - spirometry - body plethysmography - peak flow meter - thoracic independent volume - bronchial challenge test

Airways	ventilation (V) (positive pressure) - breath (inhalation, exhalation) -respiratory rate - respirometer - pulmonary surfactant - compliance - hysteresivity - airway resistance

Blood	pulmonary circulation - perfusion (Q) - hypoxic pulmonary vasoconstriction - pulmonary shunt

Interactions	ventilation/perfusion ratio (V/Q) and scan - zones of the lung - gas exchange - pulmonary gas pressures - alveolar gas equation - hemoglobin - oxygen-haemoglobin dissociation curve (2,3-DPG, Bohr effect, Haldane effect) - carbonic anhydrase (chloride shift) - oxyhemoglobin - respiratory quotient - arterial blood gas - diffusion capacity - Dlco

Control of respiration	pons (pneumotaxic center, apneustic center) - medulla (dorsal respiratory group, ventral respiratory group) - chemoreceptors (central, peripheral) - pulmonary stretch receptors (Hering-Breuer reflex)

Insufficiency	high altitude - oxygen toxicity - hypoxia