Why the study?
Does hyperventilation provoke S-T and T depressions on ECG in patients with circulatory disturbances compared to healthy controls?
Does hyperventilation provoke S-T and T depressions on ECG in patients with circulatory disturbances compared to healthy controls?
Hyperventilation can provoke functional S-T and T depressions on ECG, particularly in patients with vasoregulatory asthenia, highlighting the need to account for hyperventilation during diagnostic ECG evaluations.
Hyperventilation may confound ECG interpretation in vasoregulatory asthenia; leaves open whether standardized breathing maneuvers improve diagnostic specificity.
The ECG has been recorded in patients with vasoregulatory asthenia, coronary insufficiency and arterial hypertension, as well as in healthy controls at rest, after hyperventilation, during an orthostatic test and a work test. S‐T and T depressions, usually of sympathicotonic type, appeared or were accentuated after hyperventilation, particularly in patients with vasoregulatory asthenia, who also showed similar changes during an orthostatic test. Such ECG changes were uncommon in the other groups. The results sustain the concept that an increased sympathetic autonomic nervous tone provoked by hyperventilation causes the S‐T and T depressions, particularly in patients with vasoregulatory asthenia. The diagnostic value of the hyperventilation ECG for analysing functional S‐T and T depressions is emphasized, as well as the diagnostic difficulties in the evaluation of ECG changes in patients who hyperventilate, for instance during a hypoxia test.
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Furberg et al. (1969) studied this question.
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