Doctors are smart people but lots of them hated math in school and though that after becoming doctors, they would never have to solve an equation again!
Well think again, while reading the 10 formulas a Doctor should know and use.
In respiratory physiology, airway resistance is the resistance of the respiratory tract to airflow during inspiration and expiration. It is markedly affected by changes in the diameter of the airways, therefore diseases affecting the respiratory tract can increase airway resistance. Airway Conductance is the mathematical inverse of airway resistance.
Blood pressure is related to the wall tension of the artery or vein, according to the Young–Laplace equation (assuming that the thickness of the vessel wall is very small as compared to the diameter of the lumen). For the thin-walled assumption to be valid the vessel must have a wall thickness of no more than about one-tenth (often cited as one twentieth) of its radius.
The body mass index (BMI), or Quetelet index, is a heuristic proxy for human body fat based on an individual’s weight and height. BMI provides a simple numeric measure of a person’s thickness or thinness, allowing health professionals to discuss overweight and underweight problems more objectively with their patients.
Cardiac index (CI) is a vasodynamic parameter that relates the cardiac output (CO) to body surface area (BSA), thus relating heart performance to the size of the individual. CI stands for Cardiac Index, CO for Cardiac Output and BSA for Body Surface Area.
Cardiac output (Q or or CO as you read at the above equation ) is the volume of blood being pumped by the heart, in particular by a left or right ventricle in the time interval of one minute. SV stands for Stroke Volume and HR stands for heart ratebit*min.
In cardiovascular physiology, stroke volume (SV) is the volume of blood pumped from one ventricle of the heart with each beat. SV is calculated using measurements of ventricle volumes from an echocardiogram and subtracting the volume of the blood in the ventricle at the end of a beat (called end-systolic volume) from the volume of blood just prior to the beat (called end-diastolic volume).
Renal function, in nephrology, is an indication of the state of the kidney and its role in renal physiology. Glomerular filtration rate (GFR) describes the flow rate of filtered fluid through the kidney. Creatinine clearance rate (CCr or CrCl) is the volume of blood plasma that is cleared of creatinine per unit time and is a useful measure for approximating the GFR.
Ejection fraction (EF) is the fraction of blood in the left and right ventricles pumped out with each heartbeat. EF is applied to both the right ventricle, which ejects blood via the pulmonary valve into the pulmonary circulation, and the left ventricle, which ejects blood via the aortic valve into the cerebral and systemic circulation. the volume of blood within a ventricle immediately before a contraction is the end-diastolic volume (EDV).
Blood alcohol content (BAC), also called blood alcohol concentration, blood ethanol concentration, or blood alcohol level is most commonly used as a metric of alcohol intoxication for legal or medical purposes.
Blood alcohol content is usually expressed as a percentage of alcohol (generally in the sense of ethanol) in the blood in units of mass of alcohol per volume of blood or mass of alcohol per mass of blood, depending on the country. For instance, in North America a BAC of 0.10 (0.10% or one tenth of one percent) means that there are 0.10 g of alcohol for every dL of blood.
Low-density lipoprotein (LDL) is one of the five major groups of lipoproteins. These groups, from least dense to most dense, are: chylomicrons , very low-density lipoprotein (VLDL), intermediate-density lipoprotein (IDL), LDL, and High Density Lipoprotein (HDL), all of them, particles far smaller than human cells.
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