Objectives: To compare and establish the relevance of the relative stage of sympathetic nervous system activity (SNSA) in assemblages of patients with congestive heart failure (CHF) and obstructive lie in the grave apnea (OSA).

Objectives: To compare and establish the relevance of the relative stage of sympathetic nervous system activity (SNSA) in assemblages of patients with congestive heart failure (CHF) and obstructive lie in the grave apnea (OSA), and in a dominion government group.

Background: Elevated SNSA is a characteristic feature of CHF as well as of OSA and nonhypercapnic central lie in the grave apnea (CSA). OSA and CSA commonly come about with CHF; however, the relative contribution of apnea-related hypoxemia and drowse fragmentation to the SNSA of patients with CHF is not known.

Methods: This was a prospective, controll observational trial in which the overnight urinary norepinephrine (UNE) flat which is a measure of integrated overnight SNSA while asleep, was measured in 15 healthy male offers 15 male OSA patients who did not have CHF and 90 CHF patients (77 men) CHF patients also had right heart constraining force measurements and then were collectioned by the presence of repose apnea.

Results: Compared with healthy individuals, the mean ([+ or -] SD) UNE even was significantly elevated in the OSA arrange and was even further elevated in the CHF assemblage (13.4 [+ or -] 56 v 197 [+ or -] 123 v 322 [+ or -] 202 nmol/mmol creatinine, respectively; p < 0001 [by analysis of variance]). Within the CHF cluster the mean UNE levels were greatest in the CHF-CSA assign places to compared with the CHF-OSA assign places to and the CHF nonapnea arrange (43.9 [+ or -] 241 v 240 [+ or -] 108 v 224 [+ or -] 89 nmol/mmol creatinine, respectively; p < 0001) Using a multivariate regression mould the variance of the UNE of the same height in the CHF group was predicted, in descending order, through pulmonary capillary wedge pressure (14% variance), rapid estimate movement sleep (8%), and the mean rest pulse oximetry level (7%).

Conclusions: Overnight SNSA is significantly greater in CHF patients than in OSA patients. Moreover, the hemodynamic severity of CHF contributes to the elevation of SNSA in CHF patients to a greater grade than apnea-related hypoxemia.

first note of the scale words: apnea; heart failure; sympathetic activity; urinary norepinephrine

Abbreviations: AHI = apnea-hypopnea index; BMI = material part mass index; CAHI = central apnea-hypopnea index; CHF = congestive heart failure; CSA = central nap apnea; EMG = electromyogram; LVEF = left ventricular ejection fraction; OSA = obstructive lie in the grave apnea; PAP = pulmonary artery hurry PCWP = pulmonary capillary wedge pressure; PNE = plasma norepinephrine; REM = rapid judgment movement; SNSA = sympathetic nervous a whole activity; Sp[O.sub.2] = pulse oximetric saturation; TST = total repose time; UNE = overnight urinary norepinephrine

**********

Elevated sympathetic nervous theory activity (SNSA) is associated with a detrimental result in healthy individuals (1) and in patients with congestive heart failure (CHF) (2) In the early stages of CHF an elevated SNSA compensates for a reduc cardiac output (3) Thereafter, reduc sympathoinhibitory baroreceptor function, and increased sympathoexcitatory input from arterial chemoreceptors and skeletal muscle metaboreceptors have been considered to be responsible for the increased evens of SNSA. (3) More newly OSA and CSA have been observ to commonly coexist with CHF and, accordingly, are considered to be further contributors to the elevated SNSA in CHF patients, (4-15) however, these studies have not controll for the severity of CHF

Obstructive be still apnea (OSA) is characterized at recurrent transient upper airway closure and asphyxia despite futile respiratory efforts. The rise in SNSA seen in OSA patients is reflection to be due to hypoxemia and hypercapnia during apnea, and to arousals at apnea termination. (45) Moreover, SNSA evens fall with treatment. (4) OSA, which happens in approximately 25% of CHF patients, (16-18) may worsen CHF via elevations in the left ventricular afterload, proper either to negative intrathoracic constraining forces or elevated systemic BPs that coincide with the arousal from repose (19) Pulmonary capillary wedge constraining forces (PCWPs) and pulmonary artery constraining forces (PAPs) are known to rise in OSA patients who are clear of heart disease during repose compared with wakefulness. (20) During wakefulness, CHF-OSA patients have a significantly lower PCWP compared with CHF-central rest apnea (CSA) patients. (17) Taken together, it is likely that the negative issues that OSA might have upon CHF are largely confined to repose rather than during wakefulness.

Nonhypercapnic CSA also flash on the minds commonly (approximately 40%) in CHF (16-18) Also known as Cheyne-Stokes respiration, it is characterized by means of a crescendo-decrescendo ventilatory pattern during non-rapid notice movement (REM) sleep followed at a central apnea associated with mild hypoxemia. An arousal from rest may occur at the peak of ventilation. Characteristically, patients with CHF-CSA hyperventilate and are hypocapnic the one and the other awake and asleep, suggesting that the determining pathophysiologic proces come to one's minds during both sleep and wakefulness. (21) In contrast to OSA, elevations of PCWP (17) plasma norepinephrine (PNE) flushs (18) and skeletal muscle microneurography (14) during wakefulness, in addition to elevated overnight urinary norepinephrine (UNE) flushs (6) suggest that CSA is associated with more inexorable CHF during both sleep and wakefulness.

...