Final answer:
CPAP is effective for sleep apnea but has compliance issues due to discomfort and side effects, leading to exploration of other treatments.
Step-by-step explanation:
The contradiction for using CPAP (continuous positive airway pressure) in the field refers to the challenges patients face with its long-term compliance due to discomfort and potential side effects. While CPAP is an effective treatment for sleep apnea, ensuring consistent usage is problematic; patients often report finding the mask uncomfortable and may experience side effects such as dry mouth and nose. Alternative treatments, such as EPAP (expiratory positive air pressure) devices and lifestyle modifications including weight loss and avoiding alcohol, are being explored to improve patient compliance.