Frameless Linear Accelerator (LINAC) Based Radiosurgery (SRS) vs. Framed Gamma Knife SRS for Idiopathic Trigeminal Neuralgia (TN)

PURPOSE/OBJECTIVE(S)

Stereotactic radiosurgery (SRS) is an effective treatment for idiopathic trigeminal neuralgia (TN). Conventional treatment is done through frame-based solution due to small target and high radiation dose. More recently, LINAC based frameless SRS technique has been established as a patient friendly alternative. Herein we compared our single institution experience of LINAC based frameless SRS vs frame-based gamma knife SRS for TN. The hypothesis is LINAC based frameless SRS can provide equivalent dosimetric and clinical outcome as compared frame-based gamma knife treatment.

MATERIALS/METHODS

Patients with idiopathic TN who received SRS treatment (LINAC based frameless treatment or Gamma knife framed treatment) at our institution from 2015-2022 were included. A minimum follow up of 1 year was required. Patient data was extracted from electronic medical records and radiation treatment planning system. Pain intensity was evaluated utilizing a modified 0-4 Barrow Neurological Institute (BNI) pain intensity score, and then dichotomized where BNI score 0-2 represented response to treatment and BNI score 3-4 represented no response. Statistical analysis was conducted with a linear regression model accounting for race, gender, prior pain, pain distribution including laterality and branch involvement, medication regimen at time of treatment, previous radiation treatment, and prior procedures. Response was then compared between both modalities overall and within each sub-group with chi-square testing and linear regression.

RESULTS

A total of 81 patients were identified, 14 patients were excluded due to lack of adequate follow-up, leaving 67 for analysis. 12 (17.9%) were male and, 55 (82.1%) were female. All patients were managed with medication prior to SRS treatment. 5 (7.5%) had rhizotomy and 13 (19.4) had microvascular decompression, and 8 (11.9%) had previous gamma-knife radiosurgery prior to SRS treatment at our institution. Of the 67 patients, 23 (34.3%) received frame-based gamma knife SRS, 44(65.7%) received frameless LINAC treatment. 58 (86.6%) radiation naïve patients received 90 Gy in 1 fraction, while out of the 9 who had previously had intracranial radiation treatment 7 (10.4%) received 70 Gy and 2 (3%) received 80 Gy all prescribed to 100% isodose line. All patients were treated with 4 mm cone. There was no significant difference in brainstem dose between these two techniques. Between LINAC-based or Gamma Knife modalities rate of pain control (77.3 % vs 82.6 %, respectively, p = 0.61) as well as toxicity in facial numbness (31.8% vs 21.7%, respectively, p = 0.38) showed no statistical difference. There was no statistically significant signal (p > 0.05) detected within the subgroups analyzed. The linear regression model also showed no significant difference.

CONCLUSION

LINAC based frameless SRS provides comparable dosimetry and pain control for TN as compared to frame-based gamma knife treatment. It is a patient friendly solution for patients with TN.

The use of a multimodal enhanced recovery program for patients undergoing radical cystectomy

Objective:

Radical cystectomy is a major oncological procedure, which is associated with a morbidity rate of 30% and a hospital stay of approximately 15 days. The aim of this study was to examine the effect of a multimodal enhanced recovery program on the post-operative recovery period.

Patients:

Forty-six patients underwent radical cystectomy for invasive or high-grade bladder cancer with curative intent at a single urology unit between June 2005 and March 2009. All patients were placed on an enhanced recovery pathway, which included a change in the surgical technique and alterations in pre-, peri- and post-operative management. The main outcome measures were length of stay, time to full diet, transfusion requirement, complications and readmission rates.

Results:

The median length of stay in this unit was reduced from 17 to eight days (range 6–22). There were five major complications and a readmission rate of 10.6%. Transfusion rates were not affected and there were no deaths within three months of surgery.

Conclusions:

We have demonstrated that this multimodal pathway, which also utilises a modification in the surgical technique, is both feasible and effective in order to improve the post-operative recovery and shorten hospital stay.

A functional polymorphism of the stromelysin gene (MMP-3) influences susceptibility to primary sclerosing cholangitis

BACKGROUND AND AIMS

We have investigated the influence of a biallelic polymorphism of the promoter region of stromelysin (matrix metalloproteinase 3) on susceptibility to primary sclerosing cholangitis (PSC). The 5A allele is associated with increased transcription, compared with wild-type (6A).

METHODS

An allelic association study was performed: in stage 1, 52 PSC patients (43 with inflammatory bowel disease [IBD]) and 99 healthy subjects (HS) were genotyped. In stage 2, 59 PSC patients (49 IBD), 84 patients with uncomplicated ulcerative colitis, and 72 HS were genotyped.

RESULTS

In stage 1, 5A carriage rate (90.4% vs. 72.7%; P = 0.012) and 5A allelic frequency (65.4% vs. 48.5%; P = 0.005) were increased, and 6A homozygosity was reduced in PSC (9.6% vs. 27.3%; P = 0.012). In stage 2, 5A allelic carriage was increased in PSC (93.2% vs. 76.4% in HS; P = 0.0092) and 6A homozygosity was reduced (6.8% vs. 23.8% in HS; P = 0.0092). Portal hypertension was associated with 5A homozygosity in PSC (P = 0.035; odds ratio [OR], 3.88). In the combined data set, 5A allelic frequencies (63.5% vs. 49.4%; P = 0.001; OR, 1.78) and 5A carriage rates (91.9% vs. 74.2%; P = 0.0002; OR, 3.92) were increased, and 6A homozygosity was reduced in PSC (8.1% vs. 25.7%; P = 0.0002; OR, 0.25). Overall, portal hypertension was associated with 5A homozygosity (P = 0.0192; OR, 3.12).

CONCLUSIONS

Stromelysin polymorphism may influence susceptibility and disease progression in PSC.

How reliable is a vasectomy? Long-term follow-up of vasectomised men

Around 42 million couples worldwide rely on vasectomy as a method of family planning. It is well recognised that a vasectomy can fall at any stage, and therefore warning couples of risk of failure forms an important part of the consent procedure.

Liver span--a comparative appraisal of various methods

BACKGROUND

Alterations in the size and shape of liver occur in a wide variety of conditions. Liver span can be estimated by using clinical, radiological or radioisotopic methods. Chest dimensions may alter the liver span.

METHOD

We evaluated the liver span in 51 healthy individuals by clinical, radiological and radioisotopic methods and its relation with chest dimensions.

RESULTS

The liver span by clinical, radiological and radioisotopic methods was 10.8 +/- 1.1 cm, 12.6 +/- 1.5 cm and 13.6 +/- 1.7 cm, respectively. Liver span varied with clinical and radiological or radioisotopic method and it correlated with height of chest cage and subcostal angle in these individuals.

CONCLUSION

The liver span varies with the method used and it is correlated with chest dimensions.

Phrenic neuropathy in arsenic poisoning

A patient presented with acute arsenic neuropathy with asymmetric bilateral phrenic nerve involvement. The clinical and roentgenographic observations of phrenic nerve dysfunction were confirmed by prolonged phrenic nerve conduction time. The patient made a significant recovery with d-penicillamine therapy.