Given an abstract of a paper, generate a title for this paper such that conveys the key focus of the paper.

Input: Consider Input: Abstract: Our results suggest that ethylene oxide retention after sterilization is increased in cuprammonium cellulose plate dialyzers containing potting compound. In contrast, cuprammonium cellulose plate dialyzers without potting compound were characterized by a rapid disappearance of retained ethylene oxide after sterilization. Whether these findings explain the low incidence of SARD with cuprammonium cellulose plate dialyzers that do not contain potting material is a matter for continued study and experimentation.

Output: Extractable ethylene oxide from cuprammonium cellulose plate dialyzers: importance of potting compound.

Input: Consider Input: Abstract: To test the hypothesis that occlusive apneas result from sleep-induced periodic breathing in association with some degree of upper airway compromise, periodic breathing was induced during non-rapid-eye-movement (NREM) sleep by administering hypoxic gas mixtures with and without applied external inspiratory resistance (9 cmH2O X l-1 X s) in five normal male volunteers. In addition to standard polysomnography for sleep staging and respiratory pattern monitoring, esophageal pressure, tidal volume (VT), and airflow were measured via an esophageal catheter and pneumotachograph, respectively, with the latter attached to a tight-fitting face mask, allowing calculation of total pulmonary system resistance (Rp). During stage I/II NREM sleep minimal period breathing was evident in two of the subjects; however, in four subjects during hypoxia and/or relief from hypoxia, with and without added resistance, pronounced periodic breathing developed with waxing and waning of VT, sometimes with apneic phases. Resistive loading without hypoxia did not cause periodicity. At the nadir of periodic changes in VT, Rp was usually at its highest and there was a significant linear relationship between Rp and 1/VT, indicating the development of obstructive hypopneas. In one subject without added resistance and in the same subject and in another during resistive loading, upper airway obstruction at the nadir of the periodic fluctuations in VT was observed. We conclude that periodic breathing resulting in periodic diminution of upper airway muscle activity is associated with increased upper airway resistance that predisposes upper airways to collapse.

Output: Induction of periodic breathing during sleep causes upper airway obstruction in humans.

Input: Consider Input: Abstract: A new optimization model for explaining the observed left ventricular ejection patterns is presented. In the system model, arterial load is described by a modified windkessel load. The ejection pattern for a given cardiac output with fixed stroke volume and duration of ejection is predicted by minimizing a criterion that describes the total ventricular O2 consumption. The ejection patterns of the model closely resemble the observed ejection patterns. Also, the model predictions for changes in the values of the system parameters are qualitatively correct. The results strongly suggest that the control of ejection pattern satisfies the principle of energy cost minimization.
Output: Energy cost minimization in left ventricular ejection: an optimal control model.