Given an abstract, indicate which of the provided candidate titles (Option1 and Option2) best describes it (respond with the text of the title, not option1/2).

[Q]: Abstract: Progression of coronary artery stenosis was measured using a quantitative, computer-assisted cinevideodensitometric method in 144 arterial segments in 44 subjects undergoing coronary arteriography on two separate occasions at least 6 months apart. Projected coronary arteriograms were digitized into 512 X 512 pixel mode and percent stenosis was calculated by comparing background-corrected videodensitometric values over stenotic and normal segments. Subjects underwent repeat coronary arteriography because of worsening symptoms of angina or heart failure; subjects with renal failure, coronary artery bypass grafts or cardiac transplant were excluded. Clinical variables determined at the time of the first arteriogram included age, sex, serum cholesterol, systolic blood pressure and presence or absence of cigarette smoking, diabetes mellitus and left ventricular hypertrophy. The mean interval between arteriograms was 29.3 months. Overall progression of coronary stenosis was observed in 40 of the 44 subjects; the mean progression at 24 months was 39% (90% confidence interval, 33 to 45%) and at 36 months was 48% (40 to 56%). The degree of overall progression was related to the length of time between arteriograms (F = 5.81, p less than 0.05) and to serum cholesterol level (F = 4.37, p less than 0.05). These data indicate that using an accurate, quantitative method, it is possible to measure progression of coronary artery atherosclerosis within 2 to 3 years of the initial arteriogram. Serum cholesterol appears to be an important determinant of disease progression.
Which is the apt title for the abstract? option1: Progression of coronary atherosclerotic disease assessed by cinevideodensitometry: relation to clinical risk factors. option2: Fluosol-DA as a red-cell substitute in acute anemia [letter]
[A]: Progression of coronary atherosclerotic disease assessed by cinevideodensitometry: relation to clinical risk factors.

[Q]: Abstract: We have characterized binding and several actions of the somatomedins [insulin-like growth factors I and II (IGF-I and IGF-II)] on L6 myoblasts. Both IGF-I and IGF-II are potent stimulators of amino acid uptake, cell proliferation, and differentiation; they also suppress protein degradation in these cells. In all measurements, the relative potencies are IGF-I greater than IGF-II greater than insulin. Two recombinant DNA-produced analogs of IGF-I, (Thr59)IGF-I and (N-Met)IGF-I, were as active as native IGF-I in all four assays. However, when 125I-labeled hormones were used for studies of binding to IGF receptors, there was a striking difference between the native and recombinant IGF-I molecules. Both were bound significantly by the type I receptor (a 350K molecule that is dissociated upon sulfhydryl reduction), but the recombinant analogs exhibited little cross-reactivity with the type II receptor (a 220K molecule that is not dissociated by reduction). Thus, the equal activity of native IGF-I and its recombinant DNA-produced analogs coupled with the higher potency of IGF-I (compared to IGF-II) suggest that the type II receptor plays little or no role in the four actions of the somatomedins studied in L6 myoblasts.
Which is the apt title for the abstract? option1: The type II insulin-like growth factor (IGF) receptor has low affinity for IGF-I analogs: pleiotypic actions of IGFs on myoblasts are apparently mediated by the type I receptor. option2: Craniotomy flap osteomyelitis: a diagnostic approach.
[A]: The type II insulin-like growth factor (IGF) receptor has low affinity for IGF-I analogs: pleiotypic actions of IGFs on myoblasts are apparently mediated by the type I receptor.

[Q]: Abstract: Ninety-four cases of percutaneous tracheostomy and six cases of percutaneous cricothyroidotomy are reported in this study. There was one death attributable to the use of the device. A complication rate of 14% is reported. Clinical use for the adult and pediatric patient is reported. The procedure is compared to the standard dissection tracheostomy method of Chevalier Jackson. This procedure has several advantages over the standard dissection method, the most significant of which appears to be the speed with which it can be performed. It can be done in 30 seconds, as opposed to the dissection procedure which requires 3 minutes or more for a surgeon to complete it. Autopsies on 14 of these patients are discussed. Long-term followup, that is for 1 year and more, is reported in 19 cases. Advantages of the percutaneous technique over the standard dissection technique are detailed.
Which is the apt title for the abstract? option1: Clinical experience with percutaneous tracheostomy and cricothyroidotomy in 100 patients. option2: Foot deformities in infants and children.
[A]:
Clinical experience with percutaneous tracheostomy and cricothyroidotomy in 100 patients.