Table 1

Study characteristics

Author, yearCountrySurgery typeCognitive testPOCD assessment (day after surgery)POD assessment (%, day after surgery, tools)Age (years)Study sizeOutcomes
Cardiac surgery
Boodhwani, 2006 [46]CanadaCardiac (on-pump CABG)NP test7NA68.3448LOS
Hogue_1, 2008 [34]USACardiac (on-pump CABG and cardiac valve replacement)NP test30NA70174Function (180-day Modified Lawton’s Scale)
Hogue, 2008 [48]USACardiac (on-pump CABG and cardiac valve replacement)NP test30NA70174LOS
Liu, 2009 [45]ChinaCardiac (on-/off-pump CABG)NP test7NA60227LOS
Norkiene, 2010 [49]LithuaniaCardiac (on-pump CABG)NP test76.3%, NM,
DSM IV
60.9127LOS
Toeg, 2013 [41]CanadaCardiac (on-pump CABG)NP test90NA64.4696Mortality (90 days),
LOS
Benvenuti, 2014 [25]ItalyCardiac (on-pump CABG and cardiac valve replacement)NP test7, 90NA63.879Function (90-day Adjusted Lawton Score)
Evered, 2016 [6]AustraliaCardiac (on-/off-pump CABG)NP test90, 365NA68.0326Mortality (7.5 years),
dementia (7.5 years)
Hayashi, 2018 [43]JapanCardiac (on-pump CABG, cardiac valve replacement and thoracic aortic surgery)MMSE14NA71.4204LOS
Momeni, 2019 [42]BelgiumCardiac (on-/off-pump CABG and TAVI)MMSE520%, NM, Validated chart review method67.71513Mortality (180 days), LOS
Tarasova, 2020 [32]RussiaCardiac (CABG)NP test365NA57.3100Function (1-year SF-36)
Noncardiac surgery
Rodriguez, 2005 [47]CanadaNoncardiac (TKA)NP test7, 906.5%, NM, CAM6931LOS
Monk, 2008 [4]USANoncardiac (47% abdominal or thoracic, 39% orthopaedic)NP test7, 903.3%, Day 1–7, CAM50.61064Function (90-day IADL questionnaire),
Mortality (1 year), LOS
Steinmetz, 2009 [5]DenmarkNoncardiac (56% abdominal, 20% orthopaedic)NP test7, 90NA67.3701Mortality (8.4 years)
Steinmetz, 2013 [50]DenmarkNoncardiac (56% abdominal, 20% orthopaedic)NP test7, 90NA67.3686Dementia (10 years)
Krenk, 2014 [44]DenmarkNoncardiac (THA and TKA)NP test12-%, Day 1–3, DSM IV68.3225LOS
Franck, 2016 [40]GermanyNoncardiac (38% abdominal or thoracic, 29% orthopaedic)NP test7, 9032.9%, Day 0–7, DSM IV-TR69.6850Mortality (90 days), LOS
Borges, 2017 [33]PortugalNoncardiac (49% abdominal, 15% plastic)MoCA90NA63.741Function (90-day SF-36)
Deiner, 2021 [7]USANoncardiac (43% spine, 29% general)NP test9025.3%, NM, CAM-ICU70167Function (90-day ADCS-ADL-MCI), LOS
Mixed cardiac and noncardiac surgeries
Suraarunsumrit, 2022 [8]ThailandCardiac (on-pump CABG and cardiac valve replacement)MoCA720.4%, Day 1–7, DSM-569.9119Function (90-day Lawton–Brody-IADL), mortality (90 days), LOS
Noncardiac (42% orthopaedic, 27.3% abdominal)MoCA76.6%, Day 1–7, DSM-575.788Function (90-day Lawton–Brody-IADL), mortality (90 days), LOS
Author, yearCountrySurgery typeCognitive testPOCD assessment (day after surgery)POD assessment (%, day after surgery, tools)Age (years)Study sizeOutcomes
Cardiac surgery
Boodhwani, 2006 [46]CanadaCardiac (on-pump CABG)NP test7NA68.3448LOS
Hogue_1, 2008 [34]USACardiac (on-pump CABG and cardiac valve replacement)NP test30NA70174Function (180-day Modified Lawton’s Scale)
Hogue, 2008 [48]USACardiac (on-pump CABG and cardiac valve replacement)NP test30NA70174LOS
Liu, 2009 [45]ChinaCardiac (on-/off-pump CABG)NP test7NA60227LOS
Norkiene, 2010 [49]LithuaniaCardiac (on-pump CABG)NP test76.3%, NM,
DSM IV
60.9127LOS
Toeg, 2013 [41]CanadaCardiac (on-pump CABG)NP test90NA64.4696Mortality (90 days),
LOS
Benvenuti, 2014 [25]ItalyCardiac (on-pump CABG and cardiac valve replacement)NP test7, 90NA63.879Function (90-day Adjusted Lawton Score)
Evered, 2016 [6]AustraliaCardiac (on-/off-pump CABG)NP test90, 365NA68.0326Mortality (7.5 years),
dementia (7.5 years)
Hayashi, 2018 [43]JapanCardiac (on-pump CABG, cardiac valve replacement and thoracic aortic surgery)MMSE14NA71.4204LOS
Momeni, 2019 [42]BelgiumCardiac (on-/off-pump CABG and TAVI)MMSE520%, NM, Validated chart review method67.71513Mortality (180 days), LOS
Tarasova, 2020 [32]RussiaCardiac (CABG)NP test365NA57.3100Function (1-year SF-36)
Noncardiac surgery
Rodriguez, 2005 [47]CanadaNoncardiac (TKA)NP test7, 906.5%, NM, CAM6931LOS
Monk, 2008 [4]USANoncardiac (47% abdominal or thoracic, 39% orthopaedic)NP test7, 903.3%, Day 1–7, CAM50.61064Function (90-day IADL questionnaire),
Mortality (1 year), LOS
Steinmetz, 2009 [5]DenmarkNoncardiac (56% abdominal, 20% orthopaedic)NP test7, 90NA67.3701Mortality (8.4 years)
Steinmetz, 2013 [50]DenmarkNoncardiac (56% abdominal, 20% orthopaedic)NP test7, 90NA67.3686Dementia (10 years)
Krenk, 2014 [44]DenmarkNoncardiac (THA and TKA)NP test12-%, Day 1–3, DSM IV68.3225LOS
Franck, 2016 [40]GermanyNoncardiac (38% abdominal or thoracic, 29% orthopaedic)NP test7, 9032.9%, Day 0–7, DSM IV-TR69.6850Mortality (90 days), LOS
Borges, 2017 [33]PortugalNoncardiac (49% abdominal, 15% plastic)MoCA90NA63.741Function (90-day SF-36)
Deiner, 2021 [7]USANoncardiac (43% spine, 29% general)NP test9025.3%, NM, CAM-ICU70167Function (90-day ADCS-ADL-MCI), LOS
Mixed cardiac and noncardiac surgeries
Suraarunsumrit, 2022 [8]ThailandCardiac (on-pump CABG and cardiac valve replacement)MoCA720.4%, Day 1–7, DSM-569.9119Function (90-day Lawton–Brody-IADL), mortality (90 days), LOS
Noncardiac (42% orthopaedic, 27.3% abdominal)MoCA76.6%, Day 1–7, DSM-575.788Function (90-day Lawton–Brody-IADL), mortality (90 days), LOS

All are prospective cohort studies; ADCS-ADL-MCI, Alzheimer’s disease cooperative study/activities of daily living scale, adapted for patients with mild cognitive impairment; CABG, coronary artery bypass graft; CAM, Confusion Assessment Method; CAM-ICU, Confusion Assessment Method for the intensive care unit; DSM IV, Diagnostic and Statistical Manual of Mental Disorders, fourth edition; DSM IV-TR, Diagnostic and Statistical Manual of Mental Disorders, fourth edition, text revision; DSM-5, Diagnostic and Statistical Manual of Mental Disorders, fifth edition; IADL, Instrumental activities of daily living; LOS, length of hospital stay; MMSE, Mini-Mental State Examination score; MoCA, Montreal Cognitive Assessment Test; NA, not available data; NM, not mentioned postoperative day; NP test, neuropsychological test battery; POCD, postoperative cognitive dysfunction; RCI, reliable change index methods; SD, standard deviation; SF-36, 36-Item Short Form Survey; TAVI, transcatheter aortic valve implantation; THA, total hip arthroplasty; TKA, total knee arthroplasty.

Table 1

Study characteristics

Author, yearCountrySurgery typeCognitive testPOCD assessment (day after surgery)POD assessment (%, day after surgery, tools)Age (years)Study sizeOutcomes
Cardiac surgery
Boodhwani, 2006 [46]CanadaCardiac (on-pump CABG)NP test7NA68.3448LOS
Hogue_1, 2008 [34]USACardiac (on-pump CABG and cardiac valve replacement)NP test30NA70174Function (180-day Modified Lawton’s Scale)
Hogue, 2008 [48]USACardiac (on-pump CABG and cardiac valve replacement)NP test30NA70174LOS
Liu, 2009 [45]ChinaCardiac (on-/off-pump CABG)NP test7NA60227LOS
Norkiene, 2010 [49]LithuaniaCardiac (on-pump CABG)NP test76.3%, NM,
DSM IV
60.9127LOS
Toeg, 2013 [41]CanadaCardiac (on-pump CABG)NP test90NA64.4696Mortality (90 days),
LOS
Benvenuti, 2014 [25]ItalyCardiac (on-pump CABG and cardiac valve replacement)NP test7, 90NA63.879Function (90-day Adjusted Lawton Score)
Evered, 2016 [6]AustraliaCardiac (on-/off-pump CABG)NP test90, 365NA68.0326Mortality (7.5 years),
dementia (7.5 years)
Hayashi, 2018 [43]JapanCardiac (on-pump CABG, cardiac valve replacement and thoracic aortic surgery)MMSE14NA71.4204LOS
Momeni, 2019 [42]BelgiumCardiac (on-/off-pump CABG and TAVI)MMSE520%, NM, Validated chart review method67.71513Mortality (180 days), LOS
Tarasova, 2020 [32]RussiaCardiac (CABG)NP test365NA57.3100Function (1-year SF-36)
Noncardiac surgery
Rodriguez, 2005 [47]CanadaNoncardiac (TKA)NP test7, 906.5%, NM, CAM6931LOS
Monk, 2008 [4]USANoncardiac (47% abdominal or thoracic, 39% orthopaedic)NP test7, 903.3%, Day 1–7, CAM50.61064Function (90-day IADL questionnaire),
Mortality (1 year), LOS
Steinmetz, 2009 [5]DenmarkNoncardiac (56% abdominal, 20% orthopaedic)NP test7, 90NA67.3701Mortality (8.4 years)
Steinmetz, 2013 [50]DenmarkNoncardiac (56% abdominal, 20% orthopaedic)NP test7, 90NA67.3686Dementia (10 years)
Krenk, 2014 [44]DenmarkNoncardiac (THA and TKA)NP test12-%, Day 1–3, DSM IV68.3225LOS
Franck, 2016 [40]GermanyNoncardiac (38% abdominal or thoracic, 29% orthopaedic)NP test7, 9032.9%, Day 0–7, DSM IV-TR69.6850Mortality (90 days), LOS
Borges, 2017 [33]PortugalNoncardiac (49% abdominal, 15% plastic)MoCA90NA63.741Function (90-day SF-36)
Deiner, 2021 [7]USANoncardiac (43% spine, 29% general)NP test9025.3%, NM, CAM-ICU70167Function (90-day ADCS-ADL-MCI), LOS
Mixed cardiac and noncardiac surgeries
Suraarunsumrit, 2022 [8]ThailandCardiac (on-pump CABG and cardiac valve replacement)MoCA720.4%, Day 1–7, DSM-569.9119Function (90-day Lawton–Brody-IADL), mortality (90 days), LOS
Noncardiac (42% orthopaedic, 27.3% abdominal)MoCA76.6%, Day 1–7, DSM-575.788Function (90-day Lawton–Brody-IADL), mortality (90 days), LOS
Author, yearCountrySurgery typeCognitive testPOCD assessment (day after surgery)POD assessment (%, day after surgery, tools)Age (years)Study sizeOutcomes
Cardiac surgery
Boodhwani, 2006 [46]CanadaCardiac (on-pump CABG)NP test7NA68.3448LOS
Hogue_1, 2008 [34]USACardiac (on-pump CABG and cardiac valve replacement)NP test30NA70174Function (180-day Modified Lawton’s Scale)
Hogue, 2008 [48]USACardiac (on-pump CABG and cardiac valve replacement)NP test30NA70174LOS
Liu, 2009 [45]ChinaCardiac (on-/off-pump CABG)NP test7NA60227LOS
Norkiene, 2010 [49]LithuaniaCardiac (on-pump CABG)NP test76.3%, NM,
DSM IV
60.9127LOS
Toeg, 2013 [41]CanadaCardiac (on-pump CABG)NP test90NA64.4696Mortality (90 days),
LOS
Benvenuti, 2014 [25]ItalyCardiac (on-pump CABG and cardiac valve replacement)NP test7, 90NA63.879Function (90-day Adjusted Lawton Score)
Evered, 2016 [6]AustraliaCardiac (on-/off-pump CABG)NP test90, 365NA68.0326Mortality (7.5 years),
dementia (7.5 years)
Hayashi, 2018 [43]JapanCardiac (on-pump CABG, cardiac valve replacement and thoracic aortic surgery)MMSE14NA71.4204LOS
Momeni, 2019 [42]BelgiumCardiac (on-/off-pump CABG and TAVI)MMSE520%, NM, Validated chart review method67.71513Mortality (180 days), LOS
Tarasova, 2020 [32]RussiaCardiac (CABG)NP test365NA57.3100Function (1-year SF-36)
Noncardiac surgery
Rodriguez, 2005 [47]CanadaNoncardiac (TKA)NP test7, 906.5%, NM, CAM6931LOS
Monk, 2008 [4]USANoncardiac (47% abdominal or thoracic, 39% orthopaedic)NP test7, 903.3%, Day 1–7, CAM50.61064Function (90-day IADL questionnaire),
Mortality (1 year), LOS
Steinmetz, 2009 [5]DenmarkNoncardiac (56% abdominal, 20% orthopaedic)NP test7, 90NA67.3701Mortality (8.4 years)
Steinmetz, 2013 [50]DenmarkNoncardiac (56% abdominal, 20% orthopaedic)NP test7, 90NA67.3686Dementia (10 years)
Krenk, 2014 [44]DenmarkNoncardiac (THA and TKA)NP test12-%, Day 1–3, DSM IV68.3225LOS
Franck, 2016 [40]GermanyNoncardiac (38% abdominal or thoracic, 29% orthopaedic)NP test7, 9032.9%, Day 0–7, DSM IV-TR69.6850Mortality (90 days), LOS
Borges, 2017 [33]PortugalNoncardiac (49% abdominal, 15% plastic)MoCA90NA63.741Function (90-day SF-36)
Deiner, 2021 [7]USANoncardiac (43% spine, 29% general)NP test9025.3%, NM, CAM-ICU70167Function (90-day ADCS-ADL-MCI), LOS
Mixed cardiac and noncardiac surgeries
Suraarunsumrit, 2022 [8]ThailandCardiac (on-pump CABG and cardiac valve replacement)MoCA720.4%, Day 1–7, DSM-569.9119Function (90-day Lawton–Brody-IADL), mortality (90 days), LOS
Noncardiac (42% orthopaedic, 27.3% abdominal)MoCA76.6%, Day 1–7, DSM-575.788Function (90-day Lawton–Brody-IADL), mortality (90 days), LOS

All are prospective cohort studies; ADCS-ADL-MCI, Alzheimer’s disease cooperative study/activities of daily living scale, adapted for patients with mild cognitive impairment; CABG, coronary artery bypass graft; CAM, Confusion Assessment Method; CAM-ICU, Confusion Assessment Method for the intensive care unit; DSM IV, Diagnostic and Statistical Manual of Mental Disorders, fourth edition; DSM IV-TR, Diagnostic and Statistical Manual of Mental Disorders, fourth edition, text revision; DSM-5, Diagnostic and Statistical Manual of Mental Disorders, fifth edition; IADL, Instrumental activities of daily living; LOS, length of hospital stay; MMSE, Mini-Mental State Examination score; MoCA, Montreal Cognitive Assessment Test; NA, not available data; NM, not mentioned postoperative day; NP test, neuropsychological test battery; POCD, postoperative cognitive dysfunction; RCI, reliable change index methods; SD, standard deviation; SF-36, 36-Item Short Form Survey; TAVI, transcatheter aortic valve implantation; THA, total hip arthroplasty; TKA, total knee arthroplasty.

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