Actual preoperative fasting time in Brazilian hospitals: the BIGFAST multicenter study

Figures & data

Figure 1 Flowchart of the study.

Table 1 Actual preoperative fasting time (hours) according to the type of the surgeries in 3,715 patients

Region or organ	N	Median (IQR)	Range
Gastrointestinal	1,987	12 (5)	2–216
Abdominal wall*	589	13 (7)	2–27
Head and neck	298	9 (8)	2–48
Gynecology	253	11 (5)	2–21
Urology	177	11 (9)	2–30
Soft tissue**	128	9 (8)	2–20
Vascular	44	16 (4)	2–19
Pulmonary	14	17 (6)	2–20
Miscellaneous	225	12 (5)	2–28

Notes:

* Herniorrhaphies

** muscle and skin resections.

Abbreviation: IQR, inter-quartile range.

Figure 2 Distribution of cases according to actual preoperative fasting time interval.

Table 2 Ascending median and range of preoperative fasting time (hours) in 15 Brazilian hospitals

Hospital	Region of Brazil	N	Median (IQR)	Range
1	Southeast	216	4 (3)	2–16
2	Central West	118	4 (7)	2–17
3	Southeast	432	8 (6)	4–24
4	Central West	469	9 (9)	2–48
5	Southeast	146	11 (5)	2–25
6	Southeast	657	11 (4)	4–35
7	Central West	681	13 (5)	2–26
8	Southeast	118	11 (5)	10–18
9	Southeast	96	13 (5)	4–216
10	North	295	14 (5)	6–38
11	Southeast	147	15 (6)	10–24
12	South	36	15 (7)	6–120
13	South	54	16 (8)	10–48
14	South	208	16 (6)	5–32
15	North East	10	17 (6)	14–20
16	Southeast	32	17 (8)	8–25
Total		3,715	12 (6)	2–216

Note: Hospitals 1 to 4: modern preoperative fasting protocol; hospitals 5 to 16: traditional preoperative fasting protocol.

Abbreviation: IQR, interquartile range.

Table 3 Univariate analysis of various factors influencing preoperative fasting time

Variable	N	Median (IQR)	Range	P-value
Sex
Male	1,558	12 (7)	2–216	0.39
Female	2,157	12 (6)	2–96
Nutritional status*
Well-nourished	1,592	12 (8)	2–120	0.41
Malnourished	316	12 (8)	2–216
Disease**
Cancer	1,208	11 (6)	2–216	<0.001
Benign	2,492	12 (6)	2–120
ASA
1–2	1,741	12 (8)	2–216	0.63
3–4	156	11.5 (7)	3–48
Age
>60 years	1,036	12 (7)	2–216	0.54
<60 years	2,679	12 (6)	2–120
Hospital
Public	2,912	12 (8)	2–216	0.94
Private	803	11.5 (4)	2–35
Protocol
Traditional	2,480	13 (5)	6–216	<0.001
Liberal	1,235	8 (8)	2–48

Notes:

* Data from 1,908 patients

** data from 3,700 patients.

Abbreviations: IQR, inter-quartile range; ASA, American Society of Anesthesiologists.