Investigations

• Holter monitoring ^b worn for as long as possible  ^c

Why?

• Holter monitoring over 72 hours detects twice as many arrhythmias as 24 hours worth. ^c
• It can help diagnose a cause in 27% of cases (95% CI: 21% to 33%) ^b

Holter monitoring detects more arrhythmias the longer it is worn

day c	major arrhythmia detected  (95% CI)
1	15%  (8.3% to 23%)
2	11%  (5.1% to 20%)
3	4.2%  (0.8% to 12%)