Final answer:
The primary accent in the pronunciation of the medical term orthopnea falls on the letter combination ORTH.
Step-by-step explanation:
In the pronunciation of the medical term orthopnea, the primary accent falls on the letter combination ORTH. This means that the syllable ORTH receives the most stress in the word orthopnea. The letters PNEA, THOP, and ORTHOP do not receive the primary accent.
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