Preoperative parameters (signalment, digital radiography, urinalysis, urine microbiological culture) and novel algorithm improve prediction of canine urocystolith composition.

Objective: To determine the accuracy of 4 preoperative parameters (signalment, urinalysis, urine microbiological culture, and digital radiography) in predicting urocystolith composition, compare accuracy between evaluators of varying clinical experience and a mobile application, and propose a novel algorithm to improve accuracy.

Animals: 175 client-owned dogs with quantitative analyses of urocystoliths between January 1, 2012, and July 31, 2020.

Methods: Prospective experimental study.

A recurrent nova super-remnant in the Andromeda galaxy.

The accretion of hydrogen onto a white dwarf star ignites a classical nova eruption-a thermonuclear runaway in the accumulated envelope of gas, leading to luminosities up to a million times that of the Sun and a high-velocity mass ejection that produces a remnant shell (mainly consisting of insterstellar medium). Close to the upper mass limit of a white dwarf (1.4 solar masses), rapid accretion of hydrogen (about 10 solar masses per year) from a stellar companion leads to frequent eruptions on timescales of years to decades.

Comparison of regional myocardial blood flow and metabolism distal to a critical coronary stenosis in the fibrillating heart during alternate periods of pulsatile and nonpulsatile perfusion.

The effect of pulsatile cardiopulmonary bypass on intramyocardial gas tensions and regional myocardial blood flow was studied in 10 mongrel dogs. Following application of a critical stenosis to the circumflex coronary artery (CIRC), animals were placed on total bypass with vented, fibrillating hearts. During three 45 minute periods of perfusion, animals alternately received pulsatile or linear flow with perfusion pressure carefully maintained at 80 mm.

Regional ischemia distal to a critical coronary stenosis during prolonged fibrillation--improvement with pulsatile perfusion.

In a previous study from this laboratory, regional myocardial ischemia developed distal to a critical coronary stenosis in the fibrillating heart on cardiopulmonary bypass when myocardial perfusion was non-pulsatile. To assess the effect of pulsatile perfusion on the development of the fibrillation-induced ischemia, 10 dogs were placed on total cardiopulmonary bypass with the heart in the vented fibrillating state. A critical stenosis was applied to the left anterior descending artery (LAD).