Table 2

Average peak velocity and coronary flow velocity reserve according to the presence or absence of collaterals

VariablePatient groupBefore angioplastyAfter angioplastyp Value
Mean blood pressure (mm Hg)All patients (n = 31)98 (16)95 (16)NS
Patients with visible collaterals (n = 11)96 (14)95 (15)NS
Patients without visible collaterals (n = 20)99 (19)96 (18)NS
Heart rate (beats/min)All patients (n = 31)74 (6)75 (10)NS
Patients with visible collaterals (n = 11)71 (6)74 (7)NS
Patients without visible collaterals (n = 20)75 (6)76 (11)NS
Contralateral baseline APV (cm/s)All patients (n = 31)21 (9)12 (6)0.000000
Patients with visible collaterals (n = 11)20 (6)11 (4)0.0008
Patients without visible collaterals (n = 20)22 (10)13 (7)0.00007
Contralateral hyperaemic APV (cm/s)All patients (n = 31)47 (19)34 (15)0.00004
Patients with visible collaterals (n = 11)42 (11)30 (10)0.03
Patients without visible collaterals (n = 20)50 (23)36 (17)0.0006
Contralateral coronary flow reserveAll patients (n = 31)2.4 (0.7)2.9 (0.6)0.0003
Patients with visible collaterals (n = 11)2.2 (0.8)3.0 (0.8)0.00006
Patients without visible collaterals (n = 20)2.5 (0.6)2.8 (0.4)NS
Ipsilateral baseline APV (cm/s)All patients (n = 31)14 (6)
Patients with visible collaterals (n = 11)17 (7)
Patients without visible collaterals (n = 20)12 (5)
Ipsilateral hyperaemic APV (cm/s)All patients (n = 31)30 (17)
Patients with visible collaterals (n = 11)36 (23)
Patients without visible collaterals (n = 20)26 (12)
Ipsilateral coronary flow reserveAll patients (n = 31)2.2 (0.4)
Patients with visible collaterals (n = 11)2.1 (0.7)
Patients without visible collaterals (n = 20)2.2 (0.3)
  • Values are mean (SD).

  • The variables studied were not statistically different in the two subgroups. APV, average peak velocity.