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Table 3 Full-Field ERGs. Amplitude of a- and b-Waves for the SRR, MSR, OP, Flicker 30 Hz and SFCR

From: Long-term visual pathway alterations after elemental mercury poisoning: report of a series of 29 cases

Full-field ERGs

All patients

Control

group

p-values

95%CI

Group 1a

Control

group

p-values

95%CI

SRR

a-wave (μV)

RE

−14.74 ± 18.6

− 11.39 ± 13.56

0.5322

–

− 10.25 ± 4.23

−11.39 ± 13.56

0.7923

–

LE

−8.0 ± 9.06

− 6.81 ± 7.36

0.6595

–

− 9.90 ± 4.53

−6.81 ± 7.36

0.2278

–

 

b-wave (μV)

RE

264.42 ± 76.3

210.6 ± 80.49

0.0329

[− 103,0 to − 4,6]

188.0 ± 55.09

210.6 ± 80.49

0.4268

–

LE

262.03 ± 76.7

203.3 ± 77.83

0.0194

[−107,5 to − 9,9]

182.3 ± 49.46

203.3 ± 77.83

0.4373

–

MSR

a-wave (μV)

RE

−160.21 ± 58.8

− 196.9 ± 55.01

0.0480

[−73,0 to − 0,33]

−103.7 ± 31.6

−196.9 ± 55.01

< 0.0001

[−131.2 to − 55.2]

LE

−159.37 ± 63.6

− 187.2 ± 48.16

0.1369

–

− 102.1 ± 28.1

− 187.2 ± 48.16

< 0.0001

[− 118.4, to − 51.7]

 

b-wave (μV)

RE

414.67 ± 86.4

413.3 ± 102,7

0.9626

–

331.3 ± 82.24

413.3 ± 102,7

0.037

[53.29 to 158.7]

LE

403.92 ± 92.6

421.8 ± 96.90

0.5478

–

319.3 ± 83.02

421.8 ± 96.90

0.0085

[28.61, to 176.4]

OP

amplitude (μV)

RE

235.9 ± 106.5

570.02 ± 254.9

< 0.0001

[198,7 to 469,5]

309.5 ± 71.32

570.02 ± 254.9

0.003

–

LE

252.5 ± 175.8

525.93 ± 239.4

0.0003

[135,0 to 411,8]

292.0 ± 73.8

525.93 ± 239.4

0.004

–

Flicker

30 Hz

b-wave (μV)

RE

90.40 ± 28.5

85.46 ± 19.17

0.5408

–

64.75 ± 9.87

85.46 ± 19.17

0.0030

[7.716 to 33.70]

LE

90.13 ± 32.8

80.69 ± 17.49

0.2798

–

61.02 ± 7.56

80.69 ± 17.49

0.0018

[8.081 to 31.26]

SFCR

a-wave (μV)

RE

−13.19 ± 5.72

− 13.30 ± 13.43

0.9699

–

−9.85 ± 2.38

−13.30 ± 13.43

0.4100

–

LE

−13.62 ± 6.15

− 14.28 ± 14.72

0.8356

–

− 9.92 ± 3.55

− 14.28 ± 14.72

0.3473

–

b-wave (μV)

RE

65.09 ± 22.6

91.08 ± 11.5

0.2555

–

44.50 ± 14.08

91.08 ± 11.5

< 0.0001

[36.42 to 56.74]

LE

64.04 ± 24.7

56,89 ± 15.07

0.3003

–

44.65 ± 14.65

56,89 ± 15.07

0.0463

[0.217 to 24.2]

  1. Data are presented as mean ± SD or as numbers. SRR scotopic rod response, MSR maximal scotopic response, OP oscillatory potential, Flicker 30 Hz flicker 30 Hz, SFCR single flash cone response, μV microvolts; RE right eye, LE left eye, CI confidence interval, Amp amplitude
  2. aGroup 1 (n = 11): constituted by a subgroup of patients with evident visual disturbances in their VF. Patients with concentric constriction (17 eyes) and hemi-field defects (5 eyes) patterns
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Journal of Occupational Medicine and Toxicology

ISSN: 1745-6673