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Table 2 The characteristics of oxygen saturation and heart rate in recruited subjects

From: A preliminary assessment of vital-signs-integrated patient-assisted intravenous opioid analgesia (VPIA) for postsurgical pain

Parameters

No. of patients

 

Incidence of oxygen desaturation

 

Percentage % (95% CI)

At least one episode SpO2 < 95%

19

100

 SpO2 < 95% persisted for > 60 s

13

68.4 (46.0–84.6)

 SpO2 < 95% persisted for > 3 min

8

42.1 (23.1–63.7)

 SpO2 < 95% persisted for > 5 min

6

31.6 (15.4–54.0)

  

Median [IQR]

Post-surgery 0 h until the removal of pump

 Total time spent of SpO2 < 95%, min

 

35.3 [6.8–73.8]

 The % of time of SpO2 < 95%

 

1.9 [0.4–4.2]

0–4 h post-surgery

 Total time spent of SpO2 < 95%, min

 

2.1 [0.2–9.2]

 The % of time of SpO2 < 95%

 

0.87 [0.07–3.8]

>  4 h post-surgery

 Total time spent of SpO2 < 95%, min

 

26.8 [2.7–68.8]

 The % of time of SpO2 < 95%

 

1.4 [0.3–3.4]

Incidence of bradycardia

 

Percentage % (95% CI)

 At least one episode of HR < 60/min

19

100

 HR < 60/min persisted for > 60 s

3

15.8 (5.5–37.6)

 HR < 60/min persisted for > 3 min

1

5.3 (1.0% - 24.6)

 HR < 60/min persisted for > 5 min

1

5.3 (1.0% - 24.6)