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Table 1 Clinical, laboratory and cardiovascular magnetic resonance (CMR) parameters for the baseline, dehydration and hydration scan

From: Influence of hydration status on cardiovascular magnetic resonance myocardial T1 and T2 relaxation time assessment: an intraindividual study in healthy subjects

Variable Baseline scan (n = 12) Dehydration scan (n = 12) Hydration scan (n = 12) P value
Clinical parameters
 Systolic blood pressure (mmHg) 124 ± 12 122 ± 10 122 ± 9 0.520
 Diastolic blood pressure (mmHg) 69 ± 7 72 ± 9 67 ± 7 0.212
 Heart rate (bpm) 63 ± 6§ 59 ± 11* 64 ± 10 0.014
Laboratory parameters
 Sodium (mmol/l) 140 ± 2 141 ± 3 140 ± 3 0.210
 Potassium(mmol/l) 4.3 ± 0.5 4.1 ± 0.4 4.0 ± 0.5 0.125
 Calcium (mmol/l) 2.4 ± 0.1 2.4 ± 0.1 2.4 ± 0.1 0.175
 Chloride (mmol/l) 102 ± 2 102 ± 3 101 ± 3 0.147
 Magnesium (mmol/l) 0.8 ± 0.1§ 0.9 ± 0.1*‡ 0.8 ± 0.1§ 0.002
 Creatinine (mg/dl) 0.8 ± 0.1 0.8 ± 0.1 0.8 ± 0.1 0.226
 White blood cell count (G/l) 5.8 ± 0.7§ 7.4 ± 2.0* 6.9 ± 1.4 0.003
 Red blood cell count (G/l) 5.0 ± 0.4 5.1 ± 0.5 5.0 ± 0.5§ 0.021
 Hemoglobin (g/dl) 14.5 ± 1.1 14.7 ± 1.1 14.5 ± 1.2 0.184
 Hematocrit (%) 41.8 ± 3.0 43.0 ± 3.6 41.7 ± 3.8§ 0.021
 Platelet count (G/l) 238 ± 43§ 255 ± 56*‡ 241 ± 50§ 0.009
Cardiac MRI parameters
 Left ventricular ejection fraction (%) 64.8 ± 3.8 62.3 ± 3.7 66.9 ± 4.5 0.179
 Left ventricular end-diastolic volume (ml) 141.3 ± 28.7 142.9 ± 35.7 149.2 ± 35.7 0.076
 Left ventricular end-diastolic volume index (ml/m2) 78.5 ± 13.1 76.2 ± 12.8§ 80.3 ± 12.9 0.009
 End-diastolic wall mass (g) 82.3 ± 20.2 80.2 ± 24.3 88.91 ± 26.2 0.010
 Right ventricular ejection fraction (%) 63.0 ± 6.4 59.5 ± 5.9 62.4 ± 7.6 0.420
 Right ventricular end-diastolic volume (ml) 151.2 ± 36.7 144.9 ± 36.4 148.8 ± 38.0 0.558
 Right ventricular end-diastolic volume index (ml/m2) 81.5 ± 14.5 78.0 ± 14.2 80.2 ± 15.3 0.558
 Native T1 relaxation time (ms) 987 ± 27 968 ± 29 986 ± 28 0.006
 T2 relaxation time (ms) 52.9 ± 1.8 51.5 ± 2.1 52.2 ± 1.9 0.020
  1. Continuous variables are given as mean ± standard deviation
  2. * P < .05 versus baseline scan
  3. P < .05 versus dehydration scan
  4. § P < .05 versus hydration scan