Key complications of ventilators include:
Ventilator-associated pneumonia (VAP): This is a common and serious risk, where germs enter the lungs via the breathing tube and cause an infection. The tube makes it difficult to cough and clear airways naturally.
Lung injury: The pressure and volume of air forced into the lungs can cause damage.
Barotrauma: High pressure can lead to air leaks (e.g., pneumothorax), which can cause a lung to collapse.
Volutrauma/Atelectrauma: Overstretching some parts of the lung and the repeated collapse and reopening of tiny air sacs (alveoli) can cause microscopic tissue damage and inflammation.
Respiratory muscle weakness: Long-term use of a ventilator can weaken the diaphragm and other breathing muscles, making it harder for the patient to breathe on their own once the underlying condition has improved.
Cardiovascular effects: The positive pressure can increase pressure in the chest cavity, which may decrease blood pressure and affect how the heart works.
Other infections: Sinus infections are possible, especially with tubes placed through the nose or mouth.
Medication side effects: The necessary sedatives, painkillers, and antibiotics can cause side effects like muscle weakness and delirium.
Vocal cord damage: The breathing tube can cause temporary or permanent damage to the vocal cords.
Blood clots and skin breakdown: These risks stem from staying in one position for long periods while critically ill.
Healthcare teams use specific strategies, such as using low tidal volumes, appropriate positive end-expiratory pressure (PEEP), minimizing sedation, and promoting early mobility, to reduce these risks and manage the complications effectively.
Ventilator survival rates decrease significantly with age, with younger adults having much better outcomes than older adults, especially those over 75 or 80, who face substantially higher in-hospital and long-term mortality, often with poorer functional recovery, as higher age is a major risk factor for severe outcomes like ARDS or COVID-19 complications. For instance, some studies show less than 5% survival to discharge for those 85+ versus over 30% for those 65-74, with older patients often needing prolonged ventilation and facility care post-discharge.
General Trends by Age Group
Under 65: Lower mortality rates, with some studies showing around 12% mortality for short-term ventilation.
65-74: Roughly 31% return home after hospitalization.
80-84: About 19% return home.
Over 90: Around 14% return home.
Over 80 (COVID-19 era): Studies during the pandemic reported over 80% mortality for those over 80 on ventilators.
Key Factors Influencing Survival
Age: The most significant predictor, with older age correlating with worse outcomes.
Underlying Conditions: Chronic diseases like hypertension, diabetes, and heart disease increase risk.
Reason for Ventilation: Outcomes vary; younger trauma patients often fare better than older patients with sepsis or ARDS.
Duration: Prolonged ventilation is associated with poorer survival.
Functional Status: Poor pre-existing physical condition significantly worsens prognosis.
Long-Term Outlook for Older Adults (75+ years)
High risk of death, with nearly half dying in-hospital and over 70% dying within a year.
Few return home independent; most require facility care (nursing home, rehab).
High risk of re-hospitalization and continued dependence on medical services.
In Summary
While younger individuals generally have robust survival rates on ventilators, advanced age dramatically increases the risk of death and severe disability, with survival rates dropping sharply for those in their 80s and beyond.