1st Author (year)

 

# Patients Treated

 

Max GK Dose (Gy)

 

Period of Follow-Up

 

Tremor Improvement Rate

 

Patient Complications

 

Complication Rate

 

Kondziolka [5] (2008)

 

31

 

130-140

 

Median: 36 months

 

92%

 

hemiparesis, dysphagia, dysarthria

 

7.7%

 

Young [6] (2010)

 

161

 

141-152

 

Mean: 44 ± 33 months

 

Drawing: 81%
Writing: 77%

 

sensory loss, motor impairments, dysarthria

 

8.4%

 

Duma [7] (1999)

 

38

 

120-160

 

Median: 30 months

 

90%

 

dysarthria

 

2.6%

 

Young [8] (2000)

 

PD: 102
ET: 52

 

120-160

 

<12-96 months

 

PD: 88.3%
ET: 92.1%

 

balance disturbance, paresthesias, weakness, dysphagia

 

1.3%

 

Ohye [9] 2011

 

53

 

130

 

24 months

 

81.1%

 

transient slight motor weakness

 

1.9%

 

Mathieu [10] (2007)

 

6

 

130-150

 

Median: 27.5 months

 

100%

 

hemiparesis

 

16.7%

 

Niranjan [11] (2000)

 

11

 

130-150

 

Median: 6 months

 

100%

 

dysarthria, weakness

 

9.1%

 

Niranjan [12] (1999)

 

12

 

130-150

 

Median: 24 months

 

100%

 

dysarthria, weakness

 

8.3%

ET = essential tremor; PD = Parkinsonís disease
Table 1: Gamma Knife radiosurgery for disabling tremor.