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).

[EX Q]: Abstract: To investigate the mechanism of ventricular arrhythmias induced by epinephrine in dogs with hypokalemia, 30 adult mongrel dogs were separated into a control group (n = 13) and a hypokalemia group (n = 17). In the hypokalemia group, sodium polystyrene sulfonate (5 g/kg body weight) was infused into the colon. In both groups, the serum concentrations of sodium, potassium and calcium were measured every 15 minutes for 60 minutes. The mean (+/- standard deviation) serum potassium level of the hypokalemia group decreased significantly from 3.81 +/- 0.21 to 2.92 +/- 0.36 mEq/liter; there were no significant changes in other electrolytes. After 60 minutes, epinephrine (10 micrograms/kg) was injected intravenously in the hypokalemia and control groups, and the arrhythmia ratio (the number of ventricular ectopic beats divided by the total heart rate) was calculated for 5 minutes. Each group was further classified into subgroups of dogs with an arrhythmia ratio higher or lower than 10%. An arrhythmia ratio over 10% was observed in 7.7% of the control group and 53% of the hypokalemia group. Immediately after 5 minutes of epinephrine injection, myocardial mitochondria and plasma membrane fraction were prepared from each group. Mitochondrial calcium content and phospholipase activity of plasma membrane fraction were determined. Significant increases in both mitochondrial calcium content and phospholipase activity were observed in the dogs with hypokalemia and an arrhythmia ratio greater than 10%.(ABSTRACT TRUNCATED AT 250 WORDS)
Which is the apt title for the abstract? option1: Mechanism of cardiac arrhythmias induced by epinephrine in dogs with hypokalemia. option2: Auricular fibrillation: an unusual experience [letter]
[EX A]: Mechanism of cardiac arrhythmias induced by epinephrine in dogs with hypokalemia.

[EX Q]: Abstract: The incidence of air under the diaphragm in CAPD patients is very low, and causes directly attributable to standard CAPD techniques are even lower. Bowel perforation generally causes a larger volume of air collection under the diaphragm.
Which is the apt title for the abstract? option1: Is air under the diaphragm a significant finding in CAPD patients? option2: Contribution of topical tar oil to ultraviolet B phototherapy for psoriasis [letter]
[EX A]: Is air under the diaphragm a significant finding in CAPD patients?

[EX Q]: Abstract: Cannulation of the fimbriated end of the fallopian tube during gamete intrafallopian tube transfer (GIFT) may be at times extremely difficult and even require minilaparotomy. An ideal laparoscopic GIFT catheter should be flexible and stirrable, have a small diameter, and yet be sturdy enough to enable its manipulation. Such a catheter was developed in collaboration with Cook Ob/Gyne, a Division of Cook Inc., Indiana, with primary emphasis on easy laparoscopic manipulation. Its use in eight attempts of GIFT resulted in three pregnancies (37%).
Which is the apt title for the abstract? option1: A new stirrable catheter for gamete intrafallopian tube transfer (GIFT). option2: Complete volar metacarpophalangeal joint dislocation of a finger.
[EX A]:
A new stirrable catheter for gamete intrafallopian tube transfer (GIFT).