. Author manuscript; available in PMC: 2021 May 1.

Published in final edited form as: Anaesthesia. 2020 Feb 6;75(5):634–641. doi: 10.1111/anae.14984

Table 3.

Incidence of haemodynamic instability by stroke volume decrease on induction (< 10% vs. ≥ 10%) and using different mean arterial pressure (MAP) baseline values. Values are number (proportion) and stratified by time-point of baseline MAP determination. Haemodynamic instability was defined as either induction MAP < 55 mmHg or a > 30% decrease from baseline.

	Total	< 10% stroke volume decrease	≥ 10% stroke volume decrease	p value

*Pre-surgical testing (n = 265^)**
Stable	59 (22.3%)	39 (14.7%)	20 (7.5%)	0.751
Unstable	206 (77.7%)	142 (53.6%)	64 (24.2%)	0.751

*Pre-surgical centre (n = 265^)**
Stable	55 (20.8%)	33 (12.5%)	22 (8.3%)	0.142
Unstable	210 (79.2%)	149 (56.2%)	61 (23%)	0.142

*Operating room (n = 267^)**
Stable	107 (40.1%)	71 (26.6%)	36 (13.5%)	0.688
Unstable	160 (59.9%)	111 (41.6%)	49 (18.4%)	0.688

Of the total 283 patients in the study, 16 were missing stroke volume or induction MAP data and thus could not be included in this analysis. An additional two patients were missing pre-surgical testing data and two were missing pre-surgical centre data.