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P-wave, PR interval, PR segment: physiology, criteria & ECG findings

…first half of the P wave is therefore a reflection of right atrial depolarization and the second half is a reflection of left atrial depolarization…

NSTEMI (Non-ST Elevation Myocardial Infarction) & Unstable Angina: Diagnosis, Criteria, ECG, Management

…in a reduction of coronary blood flow and this causes subendocardial ischemia (i.e ischemia that only affects the subendocardium). STEMI, on the other hand…

Cardiac Tamponade: Recognition and Pericardiocentesis

…atrial pressure. The haemodynamic consequences are progressive impairment of right and left sided filling, reduced stroke volume, diminished cardiac output, falling arterial pressure, and, if…

Injection technique — intramuscular, subcutaneous and intradermal

…Preparation and equipment Hand disinfection; gloves where there is a risk of blood contact. An alcohol or chlorhexidine swab. Let the skin dry completely before…

Eye examination and corneal foreign body

…band and the chin in the rest. Support your working hand against the patient's zygoma or the bridge of the nose. 4. Approach tangentially…

Myocardial Mechanics: Structure and Function of Myocardial Fibers

Echocardiography Structure and contractile function of myocardial fibers The left ventricular wall can be subdivided into several layers. These layers are similar to those seen…

Physics of myocardial perfusion imaging (SPECT, PET): Radiotracers, perfusion, blood flow and viability

…radiotracers emit gamma photons directly. These gamma rays are detected by gamma cameras to create tomographic images of the left ventricle. In PET (Positron Emission…

Left Main Coronary Artery Disease: Revascularisation Strategy

…defined as a diameter reduction of at least 50%. Severe proximal disease of both the proximal left anterior descending and proximal left circumflex arteries may…

Left atrial enlargement (P mitrale) & right atrial enlargement (P pulmonale) on ECG

…first half of the P wave is therefore a reflection of right atrial activation and the second half is a reflection of left atrial activation…

Myocardial ischemia and infarction: lack of oxygen or imbalance between supply/demand

…to describe a reduction of blood flow to tissues and organs. A few decades later Cohnheim demonstrated that ligation of the left anterior descending artery…

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