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Cardiac arrest due to pneumothorax

…Pneumothorax is characterized by the presence of free air in the thoracic cavity. While this can occasionally be benign and manifest even in healthy individuals…

Acute exacerbation of COPD: quick reference

…ventilation–perfusion matching, increased physiological dead space and the Haldane effect. It is therefore misleading to explain the whole phenomenon as abolition of the patie

Doppler effect and Doppler echocardiography

…Doppler effect. When the sound source moves towards the observer, the sound waves are compressed, which leads to a shortening of the wavelength and thus…

Reduction of dislocations

…longer a joint remains dislocated, the harder the reduction becomes and the greater the risk of chondral and neurovascular injury. Aim for reduction within a…

Overview of atrioventricular (AV) blocks

…AV) blocks , subdivided according to the degree of block. First , second and third degree AV block may all be diagnosed using the ECG. First degree…

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

…tracer uptake plateaus. This saturation effect can lead to an underestimation of blood flow in regions affected by significant coronary artery disease, potentially resulting in…

Management and treatment of AV block (atrioventricular blocks)

…bradycardia is caused by beta blockers. Adrenaline (Epinephrine) α and β agonist Infusion of 2–10 μg/min (titrate as needed). T½ 5 min…

ECG changes caused by antiarrhythmic drugs, beta blockers & calcium channel blockers

…pronounced symptoms and other therapies have failed. Patients with structural heart disease or reduced left ventricular function are not eligible. Effects of propafenone and flecainide…

Hemodynamic principles and calculations

…catheterization. This section discusses hemodynamic principles and how these can be leveraged to calculate stroke volume, cardiac output, pressure conditions, severity of stenoses and regurgitations…

Exercise stress test on cycle ergometer

…before revascularisation. Evaluation of treatment effect in stable angina. Exercise induced arrhythmia or exercise induced syncope. Assessment of chronotropic function and pacemaker settings. Preoperative functional…

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