anal fistula (fistula in aÂ´no) one opening on the cutaneous surface near the anus, which may or may not communicate with the rectum. arteriovenous fistula one between an artery and a vein, either pathologic (such as a varicose aneurysm) or surgically created to ensure an access site for hemodialysis.
1 millibar (or hectopascal/hPa), is equivalent to 0.02953 inches of mercury (Hg). It is therefore only necessary to multiply a reading in millibars by the latter figure, to achieve the required conversion. E.g. for 1023 mbar, multiply by 0.02953=30.21 inches.
Rises and falls in atmospheric pressure provide a reliable indication of approaching changes in the weather within the next 24 to 48 hours. The most used unit of measurement for atmospheric pressure today is the hekto-Pascal, abbreviate hPa, which can be compared to millibar (mb). One inch of mercury is approximately 33.86388 hecto pascals (hPa).