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. 2001 Feb;85(2):185–190. doi: 10.1136/heart.85.2.185

Short term effect of continuous positive airway pressure on muscle sympathetic nerve activity in patients with chronic heart failure

S Heindl 1, C Dodt 1, M Krahwinkel 1, G Hasenfuss 1, S Andreas 1
PMCID: PMC1729615  PMID: 11156670

Abstract

OBJECTIVE—To test the hypothesis that the short term application of continuous positive airways pressure (CPAP) increases muscle sympathetic nerve activity in patients with congestive heart failure.
SETTING—University hospital and tertiary referral centre.
PATIENTS—10 patients with congestive heart failure (New York Heart Association functional class III; mean (SEM) left ventricular ejection fraction 22 (1)%) and 10 healthy subjects matched for age, sex, and weight.
MAIN OUTCOME MEASUREMENTS—Muscle sympathetic nerve activity, assessed by microneurography of the peroneal nerve, blood pressure, heart rate, minute ventilation, transcutaneous oxygen saturation, and end tidal PCO2 were measured during normal breathing, mask breathing, and CPAP at 5 and 10 cm H2O.
RESULTS—CPAP induced an increase in muscle sympathetic nerve activity and blood pressure in both the patients and the control subjects. In the patients, sympathetic nerve activity increased from 43 (14) bursts/min during mask breathing to 47 (13) bursts/min at CPAP 10 cm H20 (p = 0.03); mean blood pressure increased from 80 (3) mm Hg to 86 (4) mm Hg (p < 0.001). Oxygen saturation improved during CPAP in the patients, from 95.7 (0.6)% to 96.6 (0.7)% (p = 0.004) and remained stable in the control group. There was no effect of CPAP on minute ventilation or heart rate.
CONCLUSIONS—In patients with congestive heart failure, short term CPAP elicits sympathetic activation, probably because of unloading of the aortic or cardiopulmonary baroreceptors.


Keywords: heart failure; sympathetic activation; continuous positive airways pressure

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Figure 1  .

Figure 1  

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Individual changes of muscle sympathetic nerve activity (MSNA) at baseline, during mask breathing (CPAP 0 cm H2O), during CPAP 5 and 10 cm H2O, and during the recovery period in the patients.

Figure 2  .

Figure 2  

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Individual changes of muscle sympathetic nerve activity (MSNA) at baseline, during mask breathing (CPAP 0 cm H2O), during CPAP 5 and 10 cm H2O, and during the recovery period in the control subjects.

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