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).

Input: Consider Input: Abstract: Therapy of elevated ventricular filling pressures in patients with dilated heart failure may be limited by concern that cardiac output will be further compromised. Twenty-five patients with severe symptoms and ejection fractions of 25% or less were studied to determine the lowest ventricular filling pressures that could be achieved with vasodilator and diuretic therapy while maintaining cardiac output. In 20 of 25 patients normal pulmonary capillary wedge pressures (PCWs) were achieved (mean 10 mm Hg compared with 30 mm Hg at baseline). Stroke volume was 60 vs 39 ml at baseline. Stroke work index was 30 vs 19 g-m/m2. For each patient, over the range of PCWs, stroke volume and stroke work index were maintained and were often maximal at the lowest PCW achieved. The upright position was well tolerated in patients with normal supine PCW. Normal filling pressures can be achieved in patients with congestive heart failure without compromise of cardiac output. While congestive symptoms should be improved, the feasibility and benefit of maintaining normal filling pressures over a long term must be established.
Which is the apt title for the abstract? option1: Maintenance of cardiac output with normal filling pressures in patients with dilated heart failure. option2: Cowden disease. A hereditary polyposis syndrome diagnosable by mucocutaneous inspection.

Output: Maintenance of cardiac output with normal filling pressures in patients with dilated heart failure.

Input: Consider Input: Abstract: Identifying the parathyroid glands is of fundamental importance in thyroid and parathyroid surgery. We found that intravenous infusion of methylene blue was beneficial in intraoperative identification of the parathyroid glands in patients undergoing surgery for hyperparathyroidism as well as total and bilateral subtotal thyroidectomy. The technique is safe and easy to use, and it clearly reduces the operative time. We suggest that it be used routinely in thyroid and parathyroid surgery.
Which is the apt title for the abstract? option1: Methylene blue infusion for intraoperative identification of the parathyroid glands. option2: MR-guided aspiration biopsy: needle design and clinical trials.

Output: Methylene blue infusion for intraoperative identification of the parathyroid glands.

Input: Consider Input: Abstract: This study demonstrates that 20 to 30 microns porous, Replamineform silicone rubber prostheses remain isocompliant with adjacent arterial segments up to 8 months following implantation. This finding contrasts with the results of currently available prostheses, including autologous vein, which rapidly become minimally compliant. We conclude that this vascular construction is stable over the long-term following implantation and may improve the success of small internal diameter arterial reconstruction by eliminating failures caused by intimal hyperplasia.
Which is the apt title for the abstract? option1: Maintenance of compliance in a small diameter arterial prosthesis. option2: Severe chronic photosensitivity in association with acquired immunodeficiency syndrome [letter]
Output: Maintenance of compliance in a small diameter arterial prosthesis.