Exercise-induced desaturation and electrocardiogram changes in people with severe lung disease: an exploratory investigation of 25 serial cases.
BACKGROUND
Arterial desaturation is a commonly accepted clinical basis for discontinuing physical activity in people with chronic obstructive pulmonary disease.


OBJECTIVE
The purpose of this exploratory study was to examine the electrocardiograms of people with severe chronic obstructive pulmonary disease recovering from exercise-induced arterial desaturation.


METHODS
Subjects (n = 25) walked for 6 minutes while oxygen saturation was monitored.


METHODS
When the Spo2 decreased below 90%, subjects were asked to sit and rest while the electrocardiograms were recorded. For all patients, Spo2 decreased 11.6% on average below baseline during walking. Four patients developed dysrhythmias during desaturation, with a mean lowest Spo2 of 85%. The Spo2 in six other patients continued to decrease below 80% despite rest, yet these patients did not develop new dysrhythmias.


CONCLUSIONS
Our findings suggest that a decrease in Spo2 during exercise does not necessarily correlate with cardiac rhythm.
Jones
Alice Y M
AY
Department of Rehabilitation Sciences, The Hong Kong Polytechnic University, Hong Kong.
Yu
Wai-Cho
WC
Mok
Ngai-Shing
NS
Yeung
Olivia Y Y
OY
Cheng
Henry C W
HC
Dean
Elizabeth
E
D000368:Aged; D004562:Electrocardiography; D015444:Exercise / Q000502:physiology*; D005260:Female; D006339:Heart Rate / Q000502:physiology; D006801:Humans; D008297:Male; D010092:Oximetry; D010100:Oxygen / Q000097:blood*; D011379:Prognosis; D029424:Pulmonary Disease, Chronic Obstructive / Q000097:blood* / Q000503:physiopathology*; D012720:Severity of Illness Index
D010100:Oxygen