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Table 1 Selected ECG and echocardiogram parameters recorded prior to race and within 30–60 min after the race start time are listed

From: Prospective pre- and post-race evaluation of biochemical, electrophysiologic, and echocardiographic indices in 30 racing thoroughbred horses that received furosemide

  Pre-race (T0) RI (pre-race) Post-race (T1) RI (post-race) P value
ECG
 PR interval (sec) 0.279 (+/−0.049) 0.211–0.381 0.193 (+/−0.035) 0.146–0.259 <0.0001
 QRS duration (sec) 0.098 (+/−0.013) 0.075–0.118 0.093 (+/−0.012) 0.073–0.113 .0789
 QT interval (sec) 0.445 (+/− 0.053) 0.355–0.567 0.353 (+/− 0.047) 0.271–0.436 <0.0001
 QTc interval (sec) 0.507 (+/− 0.051) 0.438–0.591 0.417 (+/− 0.024) 0.371–0.454 <0.0001
 ST segment (mV) 1.3 (0.6,2.3) 0.2–2.9 1.8 (+/−1.0) 0.4–3.6 0.1115
 HR (bpm) 39 (32,45) 26–63 86 (69,100) 58–126 <0.0001
Echocardiogram
 LAD Sax (cm) 10.9 (+/−0.7) 9.8–12.2 10.1 (+/−0.9) 8.4–11.4 <0.0001
 LAD Lax (cm) 13.0 (+/−0.7) 11.8–14.7 11.8 (+/− 1.1) 10.1–13.5 <0.0001
 Ao (cm) 7.5 (+/−0.6) 6.6–8.6 7.3 (+/−0.5) 7.4–8.4 0.1547
 IVSd (cm) 3.3 (+/−0.4) 2.7–4.0 3.5 (+/−0.4) 2.8–4.2 0.0117
 LVIDd (cm) 12.1 (+/−1.0) 10.5–13.7 10.9 (+/−1.2) 8.5–13.0 <0.0001
 LVIDs (cm) 6.9 (+/− 1.1) 5.0–8.7 5.5 (+/−1.2) 3.3–7.4 <0.0001
 LVFWd (cm) 2.8 (+/−0.3) 2.2–3.4 2.8 (+/−0.5) 2.2–3.7 0.7321
 FS (%) 42.2 (+/−7.6) 30.8–58.0 50.0 (+/−8.2) 38.4–67.1 <0.0001
  1. Pre- (T0) and post-race values (T1) were compared and the P value is reported. The P value is bolded when a significant difference between T0 and T1 was present. The QT interval was corrected for HR (QTc) using Bazett’s formula. Normally distributed data is reported in mean +/− standard deviation. Non-parametric data is reported in median with interquartile range in parenthesis. Reported with reference intervals (RI) computed using a non-parametric approach (ie. without any distributional assumptions) using percentiles 0.025 and 0.975 to report 95% reference range