Does an holter montior detect cardiac arrythmias?

Holter monitor. Yes, but even better are monitors that you can wear for 2 - 4 weeks as they may pick up arrhythmias that may not show in a 24hr holter.
Yes. Yes, a holter will detect an arrhythmia only if you have the arrhythmia during the monitoring period (while wearing it). Sometimes people need a longer term monitor or event monitor to catch a rhythm problem.

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