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Table 2 Description of variables

From: Clinical characteristics, outcomes and regional variations of acquired valvular heart disease patients undergoing cardiac surgery in China

Variables

Description

Age

Female

BMI

Body mass index

BSA(m2)

Body surface area

Diabetes mellitus

Documented past history or fulfilled the criteria of WHO 1999

Hypertension

Documented past history or SBP > 140 mmHg and/or DBP > 90 mmHg

eGFR

Estimated glomerular filtration rate

CKD

Documented past history or fulfilled the criteria of KDIGO 2012

Dialysis

Documented past history

COPD

Long-term use of bronchodilators or steroids for lung disease

Previous stroke

Documented past history of coma ≥ 24 h or central nervous system dysfunction ≥ 72 h

Extracardiac arteriopathy

Any one or more of the following: claudication, carotid occlusion or > 50% stenosis, previous or planned intervention on the abdominal aorta, and limb arteries or carotids

NYHA III or IV

NYHA classification

Arrhythmia

Atrial fibrillation, flutter or atrioventricular block within 2 weeks before operation

Critical status

Any one or more of the following occurring preoperatively: ventricular tachycardia or fibrillation or aborted sudden death; cardiac massage; ventilation before arrival in the anaesthetic room; inotropes; intra-aortic balloon counterpulsation or ventricular-assist device before arrival in the anaesthetic room; acute renal failure (anuria or oliguria < 10 ml/h)

Previous myocardial infarction

Documented past history

Previous cardiac surgery

One or more previous major cardiac operation involving opening the pericardium

LVEF

Assessed by echocardiography (measured before surgery)

Left main stenosis

Left main coronary artery stenosis > 50%

AS

Assessed by echocardiography (measured before surgery)

Severe AI

Assessed by echocardiography (measured before surgery)

MS

Assessed by echocardiography (measured before surgery)

Severe MI

Assessed by echocardiography (measured before surgery)

Severe TI

Assessed by echocardiography (measured before surgery)

RHD

Documented past history

Endocarditis

Documented past history

Non-elective surgery

Not routine admission for operation

Aortic aneurysm operation

Combined with aortic aneurysm (or dissecting aneurysm) operation

CABG

Combined with CABG operation

  1. BMI: body mass index; BSA: body surface area; WHO: world health organization; SBP: systolic blood pressure; DBP: diastolic blood pressure; eGFR: estimated glomerular filtration rate; CKD: chronic kidney disease; KDIGO: Kidney Disease Improving Global Outcomes; COPD: chronic obstructive pulmonary disease; NYHA: New York heart association; LVEF: left ventricular ejection fraction; AS: aortic valvular stenosis; AI: aortic valvular insufficiency; MS: mitral valvular stenosis; MI: mitral valvular insufficiency; TI: tricuspid insufficiency; RHD: rheumatic heart disease; CABG: coronary artery bypass grafting