Table 1 Input parameters used to calibrate the model

Percent of admitted patients who didn’t require surgery

10 %

-

Existing data

Arrival of non-surgical patients admitted to CICU

55

Poisson

Existing data

CICU LOS

1.04, 1.6, 48, 111

Beta

Existing data

Referrals interarrival rate

33

Poisson

Existing data

Preoperative LOS (hours)

1.61, 1.3, 75, 152

Beta

Existing data

Postoperative LOS (hours):

Existing data

 Isolated CABG

0.87, 1.65, 121,577

Beta

 Isolated valve

1,2.21,121,685

Beta

 CABG & Valve surgery

121, 1.48, 199

Weibull

 Other cardiac surgery

121, 1.56, 90

Gamma

Postoperative patients returning to theatre

4 %

-

Existing data

Surgery duration (hours)

2.5,2.8,6

Triangular

Existing data