Early pregnancy rupture has been documented, and the fetus(es) have been known to continue growing in the mother’s abdominal cavity after the burst. Although it is uncommon for such fetuses to mature to full term and, of course, impossible for them to be delivered without an abdominal procedure, in some situations the placenta attaches to one of the abdominal organs.
Problems of the second stage
After a long second-stage labor, secondary inertia develops. It may be accompanied by obstructive dystocia, muscle exhaustion, or excruciating pain. Numerous factors can contribute to obstructive dystocia, but the most frequent ones are likely maternal pelvic malformation following a pelvic fracture and fetal malpresentation, malposition, and male posture.
As previously mentioned, interrupted labor is most definitely not inertia because the cat is clearly normal, labor resumes normally, and healthy, live kittens are delivered. A key distinction between the two is that secondary inertia results from earlier difficulties or delays, and the cat is frequently restless and worn out.
Dystocia can be caused by fetal malpresentation, malpositions, or male postures. The presentation of the fetus indicates which way around it is coming (head or tail first), position indicates which way up it is (rotated or unrotated), and posture indicates where the head and limbs are placed (ie, extended or flexed). Some people believe that in cats, fetal malpresentation rarely causes dystocia unless it is combined with other issues such as poor cervical relaxation or relative fetal oversize.
Others, however, have found that fetal malpresentation is the most common cause of fetal dystocia, with relative fetal oversize being extremely rare.