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

…the left atrium ( Figure 2 , left hand side). Lead V1 might therefore display a biphasic (diphasic) P wave , meaning that the greater portion of the…

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

…occurs when intrapericardial pressure equals or exceeds right atrial pressure. The haemodynamic consequences are progressive impairment of right and left sided filling, reduced stroke volume…

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

…the rest. Support your working hand against the patient's zygoma or the bridge of the nose. 4. Approach tangentially from the periphery , never through…

Myocardial Mechanics: Structure and Function of Myocardial Fibers

…tunica adventitia , respectively. Figure 1. Layers of the left ventricular wall, pericardium and ventricular cavity. The endocardium The endocardium lines the atria, ventricles and the…

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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