In later month of pregnancy due to development of the fetus the uterus also enlarged .
Due to. Enlargement uterus the diaphragm also elevate by 4 cm above .
Due to elevation of diaphragm Total lung capacity also reduced 5 percent
Diaphragmatic excursion is increased by 1-2 cm during pregnancy.( But What is Diaphragmatic excursion? ,Let me explain
When you inhale or breath in diaphragm moves down .
When you exhale or breath out diaphragm moves up
This movement of the diaphragm up and down
Progesterone relaxes lungs blood vessels so that blood can flow more easily and pulmonary resistance decreases .
Subcostal angle increases from 68 degree to 103 degree .( What is subcostal angle ? And How it is increase during pregnancy let me explain
Subcostal angle is formed between the right and left lower ribs below the chest .this angle increases because due to development of the fetus uterus enlarged and push diaphragm upward ,and due to diaphragm ribs moves outward and subcostal angle increases.
Chest circumference increases by 5 to 7 cm in pregnancy during Respiratory system physiological changes during pregnancy.
The mucosa oxf nasopharynx becomes red and swollen congested.this may cause nasal stiffness or block
Increase tidal volume in pregnancy (Tidal volume means amount of air you breathe in and breath out during one normal breath .
Normal tidal volume – 500 ml
In pregnancy tidal volume increases by about 30 to 40 Percent
