End-tidal carbon dioxide variation after a 100- and a 500-ml fluid challenge to assess fluid responsiveness

Annals of Intensive Care

Table 1 Characteristics of the population studied

Characteristics	N = 40
Age (years)	75 [57–92]
Male sex	17 (43)
Weight (kg)	69 [51–86]
Height (cm)	166 [156–177]
BMI (kg m⁻²)	25 [20–30]
Surgery
Orthopaedic surgery	26 (65)
General surgery	14 (35)
Sepsis	12 (30)
Antecedent
ASA score	2.0 [1.6–2.8]
Atrial fibrillation	5 (13)
Cardiac failure	9 (23)
COPD	4 (10)
Treatment prior surgery
Beta blockers	12 (30)
Other antiarrhythmic agents	5 (13)
Ventilation
Tidal volume (ml kg⁻¹)	6.6 [4.9–8.4]
PEEP (cmH₂0)	5 [4–7]
FiO₂ (%)	58 [50–70]
EtCO₂ (mmHg)	31 [28–34]
SpO₂ (%)	99 [97–100]
Anaesthesia protocol
Sufentanil	39 (98)
Propofol TIVA	5 (13)
Halogenated	35 (88)
Curare	16 (40)
Regional anaesthesia	14 (35)
Vasoconstrictors
Vasoconstritor use	11 (28)
Phenylephrine (µg kg⁻¹ min⁻¹)	0.2 [0.0–0.3]

Data are expressed as median and [25th–75th] or as number and proportion of patients (n = 40). Body mass index (BMI), chronic obstructive pulmonary disease (COPD), positive end-expiratory pressure (PEEP), fraction of inspired oxygen (FiO₂), end-tidal carbon dioxide (EtCO₂), arterial oxygen partial pressure (PaO₂), arterial carbon dioxide partial pressure (PaCO₂), pulse oxygen saturation (SpO₂), total intravenous anaesthesia (TIVA), vasoconstrictor (VC)