The hands-on guide to data interpretation by Sasha Abraham; et al

By Sasha Abraham; et al

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G. g. g. antihypertensives). ■ There are two predominant types of positive responses during tilt-table testing. • Cardioinhibitory response: development of significant bradycardia or asystole with subsequent hypotension. These patients may benefit from permanent pacemaker implantation to prevent symptoms/syncope. • Vasodepressor response: development of significant hypotension with relative preservation of heart rate leading to symptoms/syncope. These patients are unlikely to benefit from permanent pacing.

Adenosine or dobutamine myocardial perfusion imaging using radioactive isotopes such as thallium. Cardiopulmonary exercise testing (CPET) ■ Cardiopulmonary exercise testing is an increasingly used, non-invasive and objective method of evaluating both cardiac and pulmonary function. ■ During exercise, a mouthpiece (pressure differential pneumotachygraph) samples the inspired and expired gas, allowing both the oxygen uptake and carbon dioxide elimination to be computed. ■ ECG treadmill studies focus on detection of ischaemia, whereas CPET allows measurement of ventricular, respiratory and cellular function via the measurement of gas exchange.

Definition This is a simple investigation for estimating the degree of airway obstruction, ■ The marker on the peak-flow meter should be reset to 0, and a clean mouthpiece attached. ■ PEFR is then measured by asking larly useful when trends are compared; asking patients to keep a diary of PEFR readings over a period of time is therefore important. patients to first ‘breathe all the way out’, then ‘breathe all the way in’, then place their mouth in a tight seal around the inlet of a peak-flow meter and ‘blow out as hard as they can’.

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