cPatient risk factors: ASA grade

Study nameOutcomeOR (95%CI)CommentsRisk factor detailsOther detailsFactors adjusted for in multivariate analysis
incidence of IPH (<36) in ICU
ASA >II vs ASA I
Kongsayreepong 2003; prospective cohort study in 184 patientsmultivariate adjusted odds ratio8.35 (1.67, 41.88)statistically significant, favours ASA I, wide confidence intervals19% ASA I; 55% ASA II; 26% ASA >II.age: 15–93; theatre temperature: mean 19.5 to 20.6°C (SD 1.9); ASA: 19% ASA I; 55% ASA II; 26% ASA > II; some had active warming; mixed general/regional/combined anaesthesia; duration: Anaesthesia: range 0.5 to 11.5h. 19% had ≤ 2h.age, body weight, preoperative body temperature, ASA, diabetic neuropathy, emergency surgery, magnitude of surgery, temperature monitoring used, type of anaesthesia, iv fluid, duration surgery, ambient temperature (+ univariate: gender, FAW, duration of anaesthesia)
ASA II vs ASA I
Kongsayreepong 2003; prospective cohort study in 184 patientsmultivariate adjusted odds ratio2.87 (0.82, 10.03)not statistically significant, fairly wide confidence intervals19% ASA I; 55% ASA II; 26% ASA >II.age: 15–93; theatre temperature: mean 19.5 to 20.6°C (SD 1.9); ASA: 19% ASA I; 55% ASA II; 26% ASA >II; some had active warming; mixed general/regional/combined anaesthesia; duration: Anaesthesia: range 0.5 to 11.5h. 19% had ≤ 2h.neuropathy, emergency surgery, magnitude of surgery, temperature monitoring used, type of anaesthesia, iv fluid, duration surgery, ambient temperature (+ univariate: gender, FAW, duration of anaesthesia)
incidence of IPH (<35) in PACU
ASA II vs ASA I
Lau 2001; prospective cohort study in 18759 patientsmultivariate adjusted odds ratio1.83 (1.04, 3.19)Statistically significant; favours ASA IASA I 52%; ASA II 33%; ASA III 8%; ASA IV 2%; ASA V 0.3%; not identified 4%age: 13% <15y; 62% 15–64; 24% >65; theatre temperature: not stated; ASA: ASA I 52%; ASA II 33%; ASA III 8%; ASA IV 2%; ASA V 0.3%; not identified 4%; warming mechanism not stated; mixed general/regional/combined anaesthesia; duration: Surgery duration for all patients >2h, but no detailsage, ASA grade, type of anaesthesia, hospital. All of these were categorical variables.
incidence of IPH (<35) in PACU
ASA III vs ASA I
Lau 2001; prospective cohort study in 18759 patientsmultivariate adjusted odds ratio1.79 (0.94, 3.4)not significant; favours ASA IASA I 52%; ASA II 33%; ASA III 8%; ASA IV 2%; ASA V 0.3%; not identified 4%age: 13% <15y; 62% 15–64; 24% >65; theatre temperature: not stated; ASA: ASA I 52%; ASA II 33%; ASA III 8%; ASA IV 2%; ASA V 0.3%; not identified 4%; warming mechanism not stated; mixed general/regional/combined anaesthesia; duration: Surgery duration for all patients >2h, but no detailsage, ASA grade, type of anaesthesia, hospital. All of these were categorical variables.
ASA IV vs ASA I
Lau 2001; prospective cohort study in 18759 patientsmultivariate adjusted odds ratio3.22 (1.37, 7.54)statistically significant; favours ASA IASA I 52%; ASA II 33%; ASA III 8%; ASA IV 2%; ASA V 0.3%; not identified 4%age: 13% <15y; 62% 15–64; 24% >65; theatre temperature: not stated; ASA: ASA I 52%; ASA II 33%; ASA III 8%; ASA IV 2%; ASA V 0.3%; not identified 4%; warming mechanism not stated; mixed general/regional/combined anaesthesia; duration: Surgery duration for all patients >2h, but no detailsage, ASA grade, type of anaesthesia, hospital. All of these were categorical variables.
incidence of IPH (<35) in PACU
ASA V vs ASA I
Lau 2001; prospective cohort study in 18759 patientsmultivariate adjusted odds ratio19.91 (4.77, 88.03)fairly wide confidence interval; large effect; statistically significant; favours ASA IASA I 52%; ASA II 33%; ASA III 8%; ASA IV 2%; ASA V 0.3%; not identified 4%age: 13% <15y; 62% 15–64; 24% >65; theatre temperature: not stated; ASA: ASA I 52%; ASA II 33%; ASA III 8%; ASA IV 2%; ASA V 0.3%; not identified 4%; warming mechanism not stated; mixed general/regional/combined anaesthesia; duration: Surgery duration for all patients >2h, but no detailsage, ASA grade, type of anaesthesia, hospital. All of these were categorical variables.

From: APPENDIX F, MULTIVARIATE RISK FACTORS

Cover of The Management of Inadvertent Perioperative Hypothermia in Adults
The Management of Inadvertent Perioperative Hypothermia in Adults [Internet].
NICE Clinical Guidelines, No. 65.
National Collaborating Centre for Nursing and Supportive Care (UK).
Copyright © 2008, National Collaborating Centre for Nursing and Supportive Care.

PubMed Health. A service of the National Library of Medicine, National Institutes of Health.