Pediatricsbasic
The usual onset of DCM is insidious, although heart-failure symptoms may sometimes appear suddenly.
Answer
true
Explanation
The material describes DCM onset as usually **insidious**, while recognizing that heart-failure symptoms can sometimes occur suddenly. This means gradual disease development does not rule out an acute clinical presentation. **Key takeaway:** DCM may progress quietly before becoming clinically apparent.\n\n**Glossary:** **Insidious**: Developing gradually and often without obvious early symptoms.
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