The relative expressed estrogenicity of the newer low-dose oral contraceptives.
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The administration of two oral contraceptives to female dogs for 5 years did not produce ocular lesions. Corneal and lenticular opacities occurred with equal frequency in control and treated groups, and fundic lesions, including papilledema, venous dilatation, and venous or arterial retinal thrombosis, were not produced by doses of Enovid-E or Ovulen 1, 10, and 25 times the human dose.
Oral contraceptives were administered cyclically to 96 female rhesus monkeys for 5 years. Forty-eight animals received Enovid-E and 48 were treated with Ovulen at doses 1, 10, and 50 times the human dose. Ophthalmic lesions did not occur at any of the dose levels employed. Significant fundic lesions, including papilledema, venous dilatation, venous retinal thrombosis, or arterial retinal thrombosis, did not develop in any of the treated animals.
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A possible causal relationship between oral contraceptives and liver cell adenomas has been postulated in the recent literature. In this presentation three additional cases are reported to support the existence of such an association. The possible etiologic causes for this newly described condition and specific diagnostic procedures for its accurate diagnosis are presented.
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The effect synthetic progestins found in current oral contraceptives may exert on respiratory function has not been thoroughly investigated. This study monitored potential changes in respiratory parameters 3 and 6 months subsequent to beginning administration. Static and timed spirometric maneuvers showed significant increases in only tidal volume (P = 0.01). Ventilatory response to treadmill exercise monitored the oxygen uptake, CO2 elimination (VCO2), minute ventilation (VE), and respiratory exchange ratio at each of four workloads. An analysis of the covariance (ANCOVA) for the slopes revealed no significant variation between test periods. The ANCOVA for the means showed increases in VE and VCO2. These results suggest a stimulatory role for synthetic progestins, although ventilatory performance in response to moderate exercise does not appear compromised.
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