Given an abstract of a paper, generate a title for this paper such that conveys the key focus of the paper.
Example: Abstract: Some patients converted from ventricular fibrillation to organized rhythms by defibrillation-trained ambulance technicians (EMT-Ds) will refibrillate before hospital arrival. The authors analyzed 271 cases of ventricular fibrillation managed by EMT-Ds working without paramedic back-up. Of 111 patients initially converted to organized rhythms, 19 (17%) refibrillated, 11 (58%) of whom were reconverted to perfusing rhythms, including nine of 11 (82%) who had spontaneous pulses prior to refibrillation. Among patients initially converted to organized rhythms, hospital admission rates were lower for patients who refibrillated than for patients who did not(53% versus 76%, P = NS), although discharge rates were virtually identical (37% and 35%, respectively). Scene-to-hospital transport times were not predictively associated with either the frequency of refibrillation or patient outcome. Defibrillation-trained EMTs can effectively manage refibrillation with additional shocks and are not at a significant disadvantage when paramedic back-up is not available.
Example solution: Refibrillation managed by EMT-Ds
Example explanation: The abstract is about refibrillation and it is also mentioned in the abstract that it is managed by EMT-Ds. So it is an apt title.

Problem: Abstract: Radiographic techniques used to quantify coronary blood flow all require bolus injection of contrast material, which markedly alters the flow being measured. Newer nonionic contrast agents have been shown to have fewer adverse hemodynamic, inotropic, and rheologic effects compared with ionic media and it has been suggested that they might not substantially affect coronary blood flow. Six dogs were instrumented with electromagnetic flow probes and subendocardial ultrasonic crystals. Intracoronary injections of iohexol (300 mg/ml iodine) were administered to establish a relationship between the dose and rate of contrast injection and the effect on flow and regional myocardial function. Two and 4 ml volumes of iohexol were injected at 3 ml/sec; 4 ml volumes were administered at 1 and 4 ml/sec. The 2 and 4 ml volumes decreased coronary flow by a mean of 31% (p less than .01) and 77% (p less than .001). The 4 ml injection at 1 and 4 ml/sec 77% (p less than .001) and 69% (p less than .001). The magnitude of the fall in flow was directly related to the dose, and the rate at which the flow nadir was attained was directly related to the rate of injection. Decrements in fractional shortening were temporally delayed by several beats compared with the flow changes and showed mean decrements of 19% to 29%. The effects on regional myocardial function were independent of contrast volume. However, the degree of dysfunction was more profound with slower infusion rates, suggesting that prolongation of contrast-induced ischemia was a major modulating factor.(ABSTRACT TRUNCATED AT 250 WORDS)
Solution: The immediate effects of iohexol on coronary blood flow and myocardial function in vivo.