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Table 2 Results of the spirometry outcomes for the anterior and posterior puncture approach comparing baseline (T0) and 30 min after the interscalene block (T30)

From: Phrenic nerve block caused by interscalene brachial plexus block: breathing effects of different sites of injection

  Anterior puncture approach Posterior puncture approach
Spirometry variable Time Median (Q1, Q3) Median differenceT0-T30 (95 % CI) p-value (two-sided) Median (Q1, Q3) Median difference T0-T30 (95 % CI) p-value (two-sided)
VC [l] T0 5.09 (3.98, 5.58) 0.95 (0.79, 1.11) <0.001 4.46 (3.90, 5.37) 0.96 (0.81, 1.14) <0.001
  T30 3.98 (3.31, 4.67)    3.46 (2.90, 4.34)   
FEV1 [l/s] T0 3.8 (3.34, 4.33) 0.75 (0.63, 0.87) <0.001 3.57 (3.01, 4.11) 0.83 (0.70, 0.99) <0.001
  T30 3.05 (2.41, 3.44)    2.58 (2.05, 3.22)   
Sniff PmaxPeak [kPa] T0 6.24 (4.84, 7.67) 1.10 (0.71, 1.56) <0.001 6.25 (5.09, 8.63) 1.07 (0.46, 1.74) <0.001
  T30 5.13 (4.21, 7.22)    5.70 (4.54, 6.83)