19) Air hunger in turn encourages faster breathing, leading to further shortness of breath and more dynamic hyperinflation
Mathematical models easily demonstrated the critical importance of minute ventilation in driving dynamic hyperinflation
, and gave a potent rationale for pursuing a strategy of permissive hypercapnia in the ventilatory support of severe airflow obstruction--long before its use in ARDS.
Long-term domiciliary oxygen therapy (LDOTS) in appropriately selected patients improves exercise capacities and dynamic hyperinflation
, and thus has an impact on mortality in those with advanced COPD.
Inspiratory capacity, dynamic hyperinflation
, breathlessness, and exercise performance during the 6-minute-walk test in chronic obstructive pulmonary disease.
However, the evidence that pursed lips breathing is beneficial for dyspnoea, exercise endurance, and dynamic hyperinflation
remains uncertain (Fregonezi et al 2004, Spahija et al 2005).
A final reason that makes interval training modality a promising approach in rehabilitation programs is that the most severely impaired patients with greater dyspnea sensations, dynamic hyperinflation
, arterial hypoxemia, and lower baseline exercise capacity can better tolerate an interval exercise protocol than a continuous exercise one and they may demonstrate more adherence to the rehabilitation program.
Increased ventilatory requirements during weaning in COPD patients may result in dynamic hyperinflation
and mechanical disadvantage for the respiratory muscles.
The authors suggest smaller airways, dynamic hyperinflation
, inspiratory muscle weakness, or increased stiffness in the lungs as potentials causes.
The calculation of the pulmonary time constant is essential in determining the tidal cycle indispensably important for avoiding dynamic hyperinflation
and ventilator induced or associated injury.
The authors indicate that patients with COPD are limited during exercise by dyspnea, which is related to both an increase in respiratory muscle work and dynamic hyperinflation
The likelihood of developing VILl or VALI during mechanical ventilation can be minimized by avoiding alveolar stretch, overdistention and dynamic hyperinflation
The fact that in HFOV there is an active expiratory phase contributes to the prevention of gas trapping and dynamic hyperinflation
while promoting CO2 elimination.