TASK DEFINITION: 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).
PROBLEM: Abstract: The key determinants of alveolar capillary perfusion are transit times and the extent of recruitment. Capillaries are known to be heavily recruited in the dependent lung, but there are no direct data that bear on how capillary transit times might be affected by gravity. We directly determined mean capillary transit times on the surface of the upper, middle, and lower lung by measuring the passage of fluorescent dye through the capillaries using in vivo television microscopy. In anesthetized dogs, mean capillary transit times averaged 12.3 s in the upper lung, 3.1 s in the midlung, and 1.6 s in the lower lung. This near order of magnitude variation in speed of blood transit establishes that there is a vertical gradient of capillary transit times in the lung. As expected, dependent capillary networks were nearly fully recruited, whereas relatively few capillaries were perfused in the upper lung. The lengthy transit times and sparsely perfused capillary beds in the upper lung combine to provide a substantial part of pulmonary gas exchange reserve.
Which is the apt title for the abstract? option1: Vertical gradient of pulmonary capillary transit times. option2: Female frosh fare fine [letter]

SOLUTION: Vertical gradient of pulmonary capillary transit times.

PROBLEM: Abstract: The urine urea nitrogen/urine creatinine excretion ratio (UUN/UCr) of a "spot" urine specimen obtained approximately 5 hours after the last meal of the day can be used to accurately calculate the urinary urea excretion for the previous 24-hour period. Because UUN excretion is largely determined by dietary intake of protein nitrogen, this method can be used to estimate dietary protein intake for the previous 24-hour period. Strategies for using this simple method for inexpensively and continuously monitoring dietary protein intake are discussed.
Which is the apt title for the abstract? option1: Simple method for monitoring 24-hour urinary urea nitrogen excretion. option2: Impact of myelography on the radiotherapeutic management of malignant spinal cord compression.

SOLUTION: Simple method for monitoring 24-hour urinary urea nitrogen excretion.

PROBLEM: Abstract: Reductions in left ventricular (LV) mass have been reported after antihypertensive therapy with certain sympatholytic agents and converting enzyme inhibitors, but little or no improvement has been noted after vasodilator therapy. In this study we evaluated the effect of the calcium channel blocker nitrendipine on echocardiographic LV mass. During a 12-month period, nitrendipine was used as monotherapy in 30 patients and in combination with propranolol or a diuretic in an additional 28 patients. Nitrendipine monotherapy lowered supine blood pressure from 148/97 to 136/83 mm Hg, but LV mass did not change significantly. Supine blood pressure decreased from 155/103 to 134/86 mm Hg in patients receiving combination therapy but, again, changes in LV mass were not significant. These data suggest that nitrendipine is effective in lowering blood pressure, but this is not associated with a significant decrease in LV mass in patients with mild hypertension.
Which is the apt title for the abstract? option1: Effect of the calcium channel blocker nitrendipine on left ventricular mass in patients with hypertension. option2: A program for family medicine in an era of cost constraints.

SOLUTION:
Effect of the calcium channel blocker nitrendipine on left ventricular mass in patients with hypertension.