Diaphragmatic Paralysis
- Author: Nader Kamangar, MD, FACP, FCCP, FCCM; Chief Editor: Zab Mosenifar, MD more...
Background
The respiratory system functions as a vital pump that moves air in and out of the lung gas-exchange units. The respiratory pump consists of central respiratory centers, the spinal cord, peripheral nerves, neuromuscular junctions, and respiratory muscles.
The diaphragm, the most important muscle of ventilation, develops negative intrathoracic pressure to initiate ventilation. Innervated by cervical motor neurons C3-C5 via the phrenic nerves, the cone-shaped muscle by means of contraction decreases intrapleural pressure during inspiration, expands the rib cage, and thereby facilitates movement of gases into the lungs.
Pathophysiology
Diaphragmatic paralyses encompass a spectrum of disease involving a single leaflet, known as unilateral diaphragmatic paralysis (UDP), and that involving both leaflets, known as bilateral diaphragmatic paralysis (BDP).
Although the diaphragm performs most of the work, normal ventilation also requires the simultaneous contraction of respiration accessory muscles (ie, scalene, parasternal portion of the internal and external intercostal muscles, sternocleidomastoid, trapezius). In bilateral diaphragmatic paralysis, respiration accessory muscles assume some or all of the work of breathing by contracting more intensely. An increased effort in the struggle to breathe may fatigue the accessory muscles and lead to ventilatory failure.
Epidemiology
Frequency
United States
Incidence is unknown.
Mortality/Morbidity
Unilateral diaphragmatic paralysis
The morbidity of the unilateral paralysis is mainly based on the underlying pulmonary functional status and the etiology of the paralysis. Because most cases of unilateral diaphragmatic paralysis are found incidentally during imaging studies, many patients have no symptoms. The patients that do have symptoms and decreased quality of life are those who have underlying lung disease.
Bilateral diaphragmatic paralysis
Patients with bilateral diaphragmatic paralysis are usually symptomatic and, when symptoms are severe or in the presence of underlying lung pathology, may develop ventilatory failure without medical intervention.
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