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Heart disease is the most common underlying cause of arterial thromboembolism. It leads to the formation of blood clots in the heart, which leave it with the bloodstream and obstruct larger blood vessels, in cats mainly the aorta at the outlet of the two external iliac arteries. Arterial thromboembolism occurs suddenly and is very painful.
The head is directed to the right in the image. The heart is discerned in the center of the embryo. A hand is visible slightly above. Even before the fetal stage begins, a six-week-old human embryo can arch its back and neck. [6] By seven weeks, movement in the arms and legs can be detected by ultrasound. [6]
Another factor is due to the shortage of food stocks during winter as the insects are being driven away and as the result, bat hibernate in pregnant condition. [24] In pinnipeds, the purpose of delayed implantation is in order to increase survival chance of the young animals as the mother ensure that the neonates are born at an optimal season. [25]
The heart rate increases, but generally not above 100 beats/ minute. Total systematic vascular resistance decreases by 20% secondary to the vasodilatory effect of progesterone. Overall, the systolic and diastolic blood pressure drops 10–15 mm Hg in the first trimester and then returns to baseline in the second half of pregnancy. [ 6 ]
Cardiac activity is visible beginning at approximately 5 weeks of pregnancy. The human heart begins beating at a rate near the mother's, about 75-80 beats per minute (BPM). The embryonic heart rate (EHR) then accelerates linearly for the first month of beating, peaking at 165-185 BPM during the early 7th week, (early 9th week after the LMP).
Kittens reach puberty at the age of 9–10 months. [152] Cats are ready to go to new homes at about 12 weeks of age, when they are ready to leave their mother. [160] They can be surgically sterilized (spayed or castrated) as early as seven weeks to limit unwanted reproduction. [161]
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A major advantage of being able to record and share the recording is that it can be emailed to a healthcare professional to be checked if there are any concerns about whether or not it is the fetus's heart rate and whether or not is normal. Typically, they work from about 12 weeks. [2]