Resident-performed laser peripheral iridotomy in primary angle closure, primary angle closure suspects, and primary angle closure glaucoma

Figures & data

Table 1 Baseline characteristics of subjects

Characteristics	Subjects
Total procedures, n	196
Total patients, n	103
Total eyes, n (%)	196 (100)
Right eye, n (%)	110 (56)
Left eye, n (%)	86 (34)
Bilateral, n (%)	43 (42)
Age (years), mean ± SD	60.45±11.2
Sex
Male, n (%)	39 (37.8)
Female, n (%)	64 (62.1)
Race
Caucasian, n (%)	41 (39.8)
African American/African, n (%)	22 (21.4)
Hispanic/Latino, n (%)	20 (19.4)
Asian/Native Americans, n (%)	20 (19.4)
Mean baseline IOP (mmHg)	19.48±11.1
Mean post-laser IOP (mmHg)	18.30±7.8
Diagnosis
Primary angle closure suspect, n (%)	130 (66.3)
Primary angle closure, n (%)	30 (15.3)
Primary angle closure glaucoma, n (%)	28 (14.2)
Uveitic glaucoma, n (%)	8 (4.0)
Resident
First-year, n (%)	48 (24.5)
Second-year, n (%)	65 (33.2)
Third-year, n (%)	83 (42.3)

Abbreviations: IOP, intraocular pressure; SD, standard deviation.

Table 2 Mean power use by year of training

Subgroups	Total	First-year	Second-year	Third-year	p-value*
Mean power used in all subjects (mJ)	78.2±68.7 (n=196)	103.5±75.5 (n=48)	73.7±73.8 (n=65)	67.2±56.4 (n=83)	0.011
Mean power used in Caucasians (mJ)	68.7±64.4 (n=68)	106.1±88.5 (n=17)	71.2±60.1 (n=22)	45.0±40.0 (n=29)	0.006
Mean power used in non-Caucasians (mJ)	83.2±70.6 (n=128)	102.0±69.0 (n=31)	75.0±80.6 (n=43)	79.0±61.8 (n=54)	0.23
Mean power used in primary angle closure suspect (mJ)	70.7±62.4 (n=130)	77.0±57.9 (n=25)	71.3±68.2 (n=52)	72.2±58.6 (n=53)	0.93
Mean power used in primary angle closure (mJ)	90.5±65.7 (n=30)	142.5±72.5 (n=10)	86.9±41.1 (n=6)	60.0±38.5 (n=14)	0.0031
Mean power used in primary angle closure glaucoma (mJ)	107.11±89.1 (n=28)	135.6±86.4 (n=10)	130±126.8 (n=5)	76.12±62.5 (n=13)	0.22

Note:

* p-value based on analysis of variance comparison of mean power used by year of training.

Table 3 Complication rates by year of training

Complications	Total (n=196)	First-year (n=48)	Second-year (n=65)	Third-year (n=83)	p-value*
Elevated IOP	10/196 (5.1%)	0/48 (0.0%)	4/65 (6.2%)	6/83 (7.2%)	0.053
Aborted LPI procedure	3/196 (1.5%)	0/48 (0.0%)	2/65 (3.1%)	1/83 (1.2%)	0.31
Injury to cornea	1/196 (0.5%)	0/48 (0.0%)	1/65 (1.5%)	0/83 (0.0%)	0.33
Hyphema/microhyphema	35/196 (17.9%)	7/48 (14.6%)	12/65 (18.5%)	16/83 (19.3%)	0.78
Total	49/196 (25.0%)	7/48 (14.6%)	19/65 (29.2%)	23/83 (27.7%)	0.16

Note:

* p-value based on analysis of variance comparison of complication rates by year of training.

Abbreviations: IOP, intraocular pressure; LPI, laser peripheral iridotomy.

Table 4 Comparison of mean power use and complication rates among different diagnoses

Complication	Primary angle closure suspect (n=130)	Primary angle closure (n=30)	Primary angle closure glaucoma (n=28)	p-value*
Mean power ± SD (mJ)	70.7±62.4	90.5±65.7	107.11±89.1	0.023
Elevated IOP	8/130 (6.2%)	2/30 (6.7%)	0	0.919
Failed or incomplete LPI	3/130 (0.02%)	0	0	–
Hit cornea	1/130 (0.01%)	0	0	–
Hyphema	21/130 (16.2%)	6/30 (20.0%)	5/28 (17.9%)	0.784
Total	33/130 (25.4%)	8/30 (26.7%)	5/28 (17.9%)	0.670
Repeat	35/130 (26.9%)	3/30 (10.0%)	4/28 (14.3%)	0.072

Note:

* p-value based on analysis of variance comparison among the different diagnoses.

Abbreviations: IOP, intraocular pressure; LPI, laser peripheral iridotomy; SD, standard deviation.

Table 5 Comparison of mean power use and complication rates among Caucasians versus non-Caucasians

Complication	Caucasians (n=68)	Non-Caucasians (n=128)	p-value*
Mean power ± SD (mJ)	68.74±64.4	83.23±70.6	0.16
IOP spikes	1/68 (1.5%)	9/128 (7.0%)	0.17
Hyphema	13/68 (19.1%)	22/128 (17.2%)	0.845
Total complications	14/68 (20.6%)	35/128 (27.3%)	0.40
Total repeats	9/68 (13.2%)	44/128 (34.4%)	0.02

Note:

* p-value based on ANOVA comparison of mean power and complications between 2 groups.

Abbreviation: IOP, intraocular pressure.