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What is coronavirus ? Coronavirus is a type of virus. it is a largest category for an RNA virus. there are many different kinds, and some cause disease. a coronavirus disease COVID-19 as an infection disease identified in December 2019, caused by SARS-CoV-2 virus, a pandemic of respiratory illness, called COVID-19. SARS-CoV-2 stands for Severe Acute Respiratory Syndrome.   COVID-19 stands for :-  'CO' stands for corona,  ' VI' stands for virus ' D' stands for disease. This disease was referred to as '2019' novel 'coronavirus' or '2019-nCoV'. The coronavirus is a new virus linked to the same family of viruses as SARS and some types of common cold.  Where was COVID-19 first discovered ? The first known infection from SARS-CoV-2 were discovered in Wuhan, China. Who issued the official name of COVID-19 ? The official names of COVID-19 and SARS-CoV-2 were issued by the WHO on 11 February 2020. How does COVID-19 spread between people ? We known

 Cardiac Axis  The average direction of spread of the Depolarization wave through the Ventricles as seen from the front is called "cardiac Axis".                                    Or  Cardiac axis describe the overall direction of electrical spread within the heart. NOTE -   It is usual to decide whether this axis is in a normal direction or not. Lead aVR and lead II look at the heart from opposite directions. when seen from the front, The depolarization wave normally spreads through the ventricles from 11 O 'clock' to 5 O 'clock', so the deflection in lead aVR are normally mainly downward -ve and in lead II mainly upward +ve.  Normal Axis A normal 11 O 'clock - 5 O' clock axis means that the Depolarizing wave is spreading towards lead I, II and III,                  and is therefore associated with a predominantly upward deflection in all these leads. NOTE -   The deflection will be greater in lead II than in lead I and than in lead III.  Right Axis

  ECG INTERPRETATION BASIC  An ECG complex represents the electrical events occurring in one cardiac cycle. A complex consists of five waveforms labelled with the letters P, Q, R, S, and T. The middle three letters —Q, R, and S—are referred to as a unit, the QRS complex. ECG tracings represent the conduction of electrical impulses from the atria to the ventricles.    P WAVE  Small, Positive and smooth wave. Always +ve in lead II during sinus rhythm. P wave is virtually always +ve in leads aVL, aVF, I, V4, V5, and V6 and -ve in aVR lead. Frequently biphasic in V1 ( occasionally in V2)  the -ve deflection is normally <1mm. P wave duration should be < 0.12 sec. P wave amplitude should be <2.5 mm. Pathological P wave  Tall Tented  :-  Right Atrial Enlargement Bifid (looks like an M) :- Left Atrial Enlargement  PR INTERVAL Normal PR Interval :-  3-5 small squares                                                     or                                          120 - 200 milliseconds  

HEART CIRCULATORY SYSTEM OR  BLOOD VASCULAR SYSTEM The study of blood vascular system or circulatory system is called angiology    The vascular system is made up of the vessels that carry blood and lymph fluid through the body. It's also called the circulatory system. The arteries and veins carry blood all over the body. They send oxygen and nutrients to the body tissues.   BLOOD VESSELS 1  Arteries  2  Veins 3  Capillaries Differentiate between arteries and vein  CAPILLARIES They have only one layer i.e. simple squamous endothelium layer.  ANATOMY OF HEART Heart  is a coned shaped hollow structure equal to the size of puzzle fit. It is a mesodermally derived organ, is situated in the thoracic cavity, in between the two lungs (mediastinum), slightly tilled to the left. The heart weight between 200 to 425g.  The lower portion is apex and upper portion is base. Wall of heart  1.  Pericardium 2.  Myocardium 3.  Endocardium Pericardium--  It is a outermost layer of the heart. Heart is