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Table 2 Trial Procedures and outcomes

From: Evaluation of pre-hospital use of a valsalva assist device in the emergency treatment of supraventricular tachycardia [EVADE]: a randomised controlled feasibility trial

 

Intervention (n = 17)

Control (n = 17)

VAD delivered VM, n

17

0

Control delivered VM, n

0

17

Mean number of VM attempts, n (range)

2.3 (1–3)

2.7 (1–3)

Modified VM used, n

14

13

Legible pre-VM ECG available, n (%)

16 (94)

15 (88)

Legible post-VM ECG available, n (%)

16 (94)

16 (94)

Cardioversion, n (%, 95%CI)*

4 (24, 10 to 47)

0 (0, 0 to 18)

Not conveyed to hospital, n (%, 95%CI)

2 (12, 3 to 34)

0 (0, 0 to 18)

Total mean (median, range) ambulance episode duration (min)

62 (54, 27 to 117)

58 (61, 29 to 102)

Consent for phone follow-up, n

16

13

Phone follow up completed, n

12

9

Eligible presenting rhythm+, n

14

13

ECG Evidence of cardioversion on post-VM ECG in eligible participants+, n (%)

6 (43%)

3 (23%)

  1. VAD valsalva assist device, VM valsalva manoeuvre, ECG electrocardiograph, CI confidence interval
  2. *As recoded by the recruiting ambulance clinician
  3. +As determined by independent retrospective review of ECGs by the emergency department consultant