J Clin Med Res

Journal of Clinical Medicine Research, ISSN 1918-3003 print, 1918-3011 online, Open Access

Article copyright, the authors; Journal compilation copyright, J Clin Med Res and Elmer Press Inc

Journal website http://www.jocmr.org

Original Article

Volume 1, Number 5, December 2009, pages 267-273

Blood Transfusion Practices in Total Joint Arthroplasties in Jamaica

Figure 1. Blood transfusion requirements. THA (total hip arthroplasty), TKA (total knee arthroplasty).

Figure 2. Graphing the predicted risk of post-surgery transfusion against preoperative hemoglobin values (adjusted for all the other variables listed in Table 1).

Figure 3. Graphing the predicted risk of post-surgery transfusion against preoperative hemoglobin values (adjusted for all the other variables listed above where patients who donated autologous blood are excluded).

**Table 1.** Logistic Regression Analysis to Assess Factors Impacting the Risk of Post-surgery Transfusion
Variable	Odds Ratio	95% CI	P-value
N = 102 patients with non-missing values.
Gender (M vs F)	0.544	0.153 - 1.936	0.347
Age	1.005	0.960 - 1.053	0.815
Pre-op Hb	1.289	0.865 - 1.921	0.212
BMI	1.046	0.932 - 1.174	0.447
Duration of surgery	1.005	0.995 - 1.015	0.354
Est. blood loss	1.002	1.001 - 1.003	0.000*
Type of anaesthesia
Regional vs General	2.033	0.620 - 6.668	0.242
Combined vs General	1.026	0.220 - 4.785	0.974

Table 1. Logistic Regression Analysis to Assess Factors Impacting the Risk of Post-surgery Transfusion

Variable

Odds Ratio

95% CI

P-value

N = 102 patients with non-missing values.

Gender (M vs F)

0.544

0.153 - 1.936

0.347

Age

1.005

0.960 - 1.053

0.815

Pre-op Hb

1.289

0.865 - 1.921

0.212

BMI

1.046

0.932 - 1.174

0.447

Duration of surgery

1.005

0.995 - 1.015

0.354

Est. blood loss

1.002

1.001 - 1.003

0.000*

Type of anaesthesia

Regional vs General

2.033

0.620 - 6.668

0.242

Combined vs General

1.026

0.220 - 4.785

0.974

**Table 2.** Logistic Regression Analysis to Assess Factors Impacting the Risk of Post-surgery Transfusion
Variable	Odds Ratio	95% CI	P Value
N = 68 patients with non-missing values and who did not donate blood.
Gender (M vs F)	0.277	0.032 - 2.393	0.243
Age	1.015	0.951 - 1.084	0.651
Pre-op Hb	0.777	0.413 - 1.463	0.435
BMI	1.107	0.954 - 1.286	0.181
Duration of surgery	1.007	0.993 - 1.022	0.329
Est. blood loss	1.002	1.001 - 1.004	0.002*
Type of anaesthesia
Regional vs General	2.568	0.554 - 11.889	0.228
Combined vs General	1.474	0.042 - 5.285	0.544

Table 2. Logistic Regression Analysis to Assess Factors Impacting the Risk of Post-surgery Transfusion

Variable

Odds Ratio

95% CI

P Value

N = 68 patients with non-missing values and who did not donate blood.

Gender (M vs F)

0.277

0.032 - 2.393

0.243

Age

1.015

0.951 - 1.084

0.651

Pre-op Hb

0.777

0.413 - 1.463

0.435

BMI

1.107

0.954 - 1.286

0.181

Duration of surgery

1.007

0.993 - 1.022

0.329

Est. blood loss

1.002

1.001 - 1.004

0.002*

Type of anaesthesia

Regional vs General

2.568

0.554 - 11.889

0.228

Combined vs General

1.474

0.042 - 5.285

0.544

**Table 3.** Analysis of Average Preoperative Hemoglobin Levels in all Patients
Was patient transfused?	Number of patients	Pre-operative Hemoglobin
All Patients:					0.359
No	43	11.9	1.3	11.5 - 12.3
Yes	75	12.1	1.4	11.8 - 12.4
Females only					0.094
No	32	11.5	1.0	11.1 - 11.9
Yes	58	11.9	1.3	11.6 - 12.3
Males only					0.555
No	11	13.0	1.2	12.2 - 13.9
Yes	17	12.7	1.5	11.9 - 13.5

Table 3. Analysis of Average Preoperative Hemoglobin Levels in all Patients

Was patient transfused?

Number of patients

Pre-operative Hemoglobin

Mean

Standard Deviation

95% CI

P-value

All Patients:

0.359

11.9

1.3

11.5 - 12.3

Yes

12.1

1.4

11.8 - 12.4

Females only

0.094

11.5

1.0

11.1 - 11.9

Yes

11.9

1.3

11.6 - 12.3

Males only

0.555

13.0

1.2

12.2 - 13.9

Yes

12.7

1.5

11.9 - 13.5

**Table 4.** Analysis of Average Preoperative Hemoglobin Levels in Persons who did not Donate Blood
Was patient transfused?	Number of patients	Pre-operative Hemoglobin
All Patients:					0.462
No	40	11.9	1.3	11.5 - 12.3
Yes	42	11.7	1.3	11.2 - 12.1
Females only					0.730
No	31	11.5	1.0	11.1 - 11.9
Yes	37	11.6	1.3	11.2 - 12.1
Males only					0.154
No	9	13.1	1.4	12.1 - 14.2
Yes	5	12.0	1.3	10.3 - 13.6

Table 4. Analysis of Average Preoperative Hemoglobin Levels in Persons who did not Donate Blood

Was patient transfused?

Number of patients

Pre-operative Hemoglobin

Mean

Standard Deviation

95% CI

P-value

All Patients:

0.462

11.9

1.3

11.5 - 12.3

Yes

11.7

1.3

11.2 - 12.1

Females only

0.730

11.5

1.0

11.1 - 11.9

Yes

11.6

1.3

11.2 - 12.1

Males only

0.154

13.1

1.4

12.1 - 14.2

Yes

12.0

1.3

10.3 - 13.6