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Table 1 Study characteristics

From: Risks and benefits of hypotensive resuscitation in patients with traumatic hemorrhagic shock: a meta-analysis

Study

Country

Study design

Jadad Quality score/Newcastle-Ottawa scale (NOS)

Participants

Intervention

Control

Bickell 1994

USA

Single-center, prospective RCT

Three out of five

-No double blind

Gunshot or stab wounds to the torso who had SBP<90 mmHg

Delayed resuscitation with RLS 10ml/hr until definitive treatment

Immediate resuscitation to maintain SBP at least 100 mmHg

Dutton 2002

USA

Single-center, prospective RCT

Three out of five

-No double blind

Traumatic hemorrhagic shock with SBP <90 mmHg and evidence of ongoing bleeding

Low SBP of 70 mmHg

Conventional SBP > 100 mmHg

WANG Mei-tang 2007

China

Single-center, prospective cohort study

Selection: 3

Comparability: 2

Outcome: 2

Traumatic hemorrhagic shock

Preoperative SBP approximately 70-80 mmHg

Preoperative SBP >90 mmHg

ZHENG Wei-hua 2007

China

Single-center, prospective, RCT

Two out of five

-No method of randomization

-No double blind

Traumatic hemorrhagic shock patients

Limited fluid resuscitation (MAP 50-60 mmHg)

Aggressive fluid resuscitation (MAP 70 mmHg)

HUA Li-dain 2010

China

Prospective, RCT

Two out of five

-No method of randomization

-No double blind

Severe multiple hemorrhagic shock

Limited fluid resuscitation (SBP 70 mmHg)

Observational with MAP at least 90/60 mmHg

WANG Aitian 2010

China

Prospective, RCT

Two out of five

-No method of randomization

-No double blind

Traumatic hemorrhagic shock

Limited fluid resuscitation to maintain SBP 70 mmHg

Conventional resuscitation to maintain SBP 100 mmHg

Fan Hai-Peng 2011

China

Prospective, RCT

Two out of five

-No method of randomization

-No double blind

Pelvic fracture with hemorrhagic shock

Low MAP 50-60 mmHg or SBP 70-90 mmHg

Conventional MAP 60-80 mmHg or SBP >100 mmHg

Morrison 2011

China

Single-center, prospective, two-arm, intention to treat, RCT

Three out of five

-No double blind

Patients undergoing laparotomy or thoracotomy for blunt and penetrating trauma who had SBP < 9o mmHg

Experimental group with MAP 50 mmHg

Control group with MAP 65 mmHg

Fan Hai-Peng 2012

China

Single-center, RCT

Two out of five

-No method of randomization

-No double blind

Hepatic and splenic injury with hemorrhagic shock

Limited fluid resuscitation (MAP 50-60 mmHg)

Conventional resuscitation (SBP 100 mmHg or MAP 60-80 mmHg)

LI Wenhao 2012

China

Prospective, RCT

Two out of five

-No method of randomization

-No double blind

Traumatic hemorrhagic shock without controlling bleeding

Limited fluid resuscitation (MAP 55 mmHg)

Adequate fluid resuscitation (MAP 75mm Hg)

Chen Mu-hu 2013

China

Prospective, RCT

Two out of five

-No method of randomization

-No double blind

Traumatic hemorrhagic shock patients

Limited fluid resuscitation (SBP 70 mmHg)

Aggressive fluid resuscitation (SBP 90 mmHg)

ZHAO yong-gang 2013

China

Retrospective cohort study

Selection: 4

Comparability: 2

Outcome: 2

Traumatic hemorrhagic shock patients

Objective group (SBP 85 mmHg, limited fluid)

Control group (SBP >90 mmHg, rapid and full replenishment of fluid

WANG Xiao-guo 2014

China

Prospective, RCT

Two out of five

-No method of randomization

-No double blind

Traumatic liver and splenic injury

Limited fluid resuscitation (MAP 50-70 mmHg)

Conventional resuscitation (MAP 70-90 mmH)

ZENG Fan-yuan 2014

China

Single-center, cohort study

Selection: 4

Comparability: 2

Outcome: 2

Uncontrolled traumatic hemorrhagic shock patients

Experimental group (MAP 50 mmHg)

Control group (MAP 70 mmHg)

Chen Mianzhan 2015

China

Prospective, RCT

Two out of five

-No method of randomization

-No double blind

Traumatic hemorrhagic shock patients

Limited resuscitation (SBP at least 80 mmHg)

Conventional resuscitation (SBP at least 90 mmHg)

Chen Yuan-bing, 2015

China

Prospective, RCT

Two out of five

-No method of randomization

-No double blind

Traumatic hemorrhagic shock patients

Limited resuscitation (SBP 70 mmHg)

Conventional resuscitation (SBP >90 mmHg)

Huang Ting 2015

China

Prospective, RCT

Two out of five

-No method of randomization

-No double blind

Traumatic hemorrhagic shock

Control group with MAP 40-60 mmHg

Observation group with MAP 60-90 mmHg

Schreiber 2015

USA

Multi-center, RCT

Three out of five

-No double blind

Blunt or penetrating trauma patients with SBP <90 mmHg

Administer 250 ml of fluid if SBP <70 mmHg or absent radial pulse

Administer 2 liters initially and additional fluid as needed to maintain SBP > 110 mmHg

Wen Zhen-jie 2015

China

Multi-center, prospective cohort studies

Selection: 4

Comparability: 2

Outcome: 2

Traumatic hemorrhagic shock

Limited fluid resuscitation (SBP 75 mmHg)

Conventional fluid resuscitation (SBP > 100 mmHg)

XU Guoping 2015

China

Single center, prospective RCT

Two out of five

-No method of randomization

-No double blind

Traumatic hemorrhagic shock patients

Limited fluid resuscitation (MAP 40-60 mmHg or SBP 70 mmHg)

Conventional resuscitation (MAP 60-80 mmHg or SBP > 90 mmHg)

YAO Jian-hui 2015

China

Single center, prospective, RCT

Two out of five

-No method of randomization

-No double blind

Multiple traumatic hemorrhagic shock patients

Limited fluid resuscitation (MAP 40-50 mmHg)

Active fluid resuscitation (MAP 60-80 mmHg)

Carrick 2016

USA

Single-center, prospective, two-arm, intention-to-treat, RCT

Three out of five

-No double blind

Penetrating trauma patients with SBP < 90 mmHg who were brought emergently to OR for bleeding control

Keep low MAP (MAP 50 mmHg)

Keep normotension (MAP at least 65 mmHg)

Dai Yulong, 2016

China

Prospective, RCT

Two out of five

-No method of randomization

-No double blind

Traumatic hemorrhagic shock patients

Limited fluid resuscitation (SBP 65 mmHg)

Conventional resuscitation (SBP 90 mmHg)

Wang Fengyong 2016

China

Single center, prospective RCT

Two out of five

-No method of randomization

-No double blind

Active hemorrhagic shock

Limited fluid resuscitation (maintain MAP 40-60 mmHg)

Conventional resuscitation (maintain MAP 60-90 mmHg)