TY - JOUR
T1 - Holmium:yttrium-aluminum-garnet lithotripsy efficiency varies with stone composition
AU - Teichman, Joel M H
AU - Vassar, George J.
AU - Glickman, Randolph D.
N1 - Funding Information:
This study was supported in part by an unrestricted grant from Research to Prevent Blindness to the Department of Ophthalmology (R.D.G.). Adult Urology
PY - 1998/9
Y1 - 1998/9
N2 - Objectives. To test the hypothesis that holmium:yttrium-aluminum-garnet (YAG) lithotripsy efficiency varies with stone composition. Methods. Single pulses of holmium:YAG energy were delivered using 272-, 365-, 550-, and 940- μm optical fibers to human calculi composed of calcium oxalate monohydrate (COM), calcium hydrogen phosphate dihydrate (CHPD), cystine, magnesium ammonium phosphate hexohydrate (MAPH), and uric acid. Energy/pulse settings were 0.2, 0.5, 1.0, and 1.5 J. Stone crater width and depth were characterized with reflectance light microscopy. Results. For similar energies overall MAPH yielded the deepest and widest craters. CHPD, cystine, and uric acid yielded craters of intermediate width and depth. COM yielded the smallest craters. Within any given composition, increased pulse energy yielded craters of increased width and depth. Conclusions. Holmium:YAG lithotripsy efficiency varies with stone composition. The rank order of crater size appears to correlate with thermal threshold for each composition. Increased holmium:YAG energy produces larger craters for all compositions.
AB - Objectives. To test the hypothesis that holmium:yttrium-aluminum-garnet (YAG) lithotripsy efficiency varies with stone composition. Methods. Single pulses of holmium:YAG energy were delivered using 272-, 365-, 550-, and 940- μm optical fibers to human calculi composed of calcium oxalate monohydrate (COM), calcium hydrogen phosphate dihydrate (CHPD), cystine, magnesium ammonium phosphate hexohydrate (MAPH), and uric acid. Energy/pulse settings were 0.2, 0.5, 1.0, and 1.5 J. Stone crater width and depth were characterized with reflectance light microscopy. Results. For similar energies overall MAPH yielded the deepest and widest craters. CHPD, cystine, and uric acid yielded craters of intermediate width and depth. COM yielded the smallest craters. Within any given composition, increased pulse energy yielded craters of increased width and depth. Conclusions. Holmium:YAG lithotripsy efficiency varies with stone composition. The rank order of crater size appears to correlate with thermal threshold for each composition. Increased holmium:YAG energy produces larger craters for all compositions.
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U2 - 10.1016/S0090-4295(98)00239-8
DO - 10.1016/S0090-4295(98)00239-8
M3 - Article
C2 - 9730449
AN - SCOPUS:0032167834
SN - 0090-4295
VL - 52
SP - 392
EP - 397
JO - Urology
JF - Urology
IS - 3
ER -