Multilevel Organization of Ambulatory Monitoring Units

This study monitored high-amplitude propagated contractions (HAPCs) in ambulating subjects over a 24-h period using a new ambulatory recording system. Twelve healthy volunteers aged 34 +/- 5.96 yr participated. Approximately 12 h after a Colyte bowel prep, a small catheter (OD less than 3 mm), containing three solid-state pressure transducers spaced 5 cm apart, was positioned by flexible sigmoidoscope at 40-50 cm from the anal verge. A battery-operated data recorder sampled the pressure at each port at 1 Hz and stored the values on all ports if any port exceeded 75 mmHg. At the conclusion of the 24-h period, an X-ray was taken to confirm the location of the catheter. Fifty-four percent of all HAPCs preceded a bowel movement by less than or equal to 1 h. Forty-nine percent of all HAPCs occurred within 1 h after a high-fat meal, and 33% occurred within 1 h of morning awakening. Reverse propagated waves, not previously described in the colon, were observed in three individuals. Spontaneous high-amplitude caudally propagated contractions occur 6.9 +/- 1.5 times/24 h in the sigmoid colon in ambulating asymptomatic individuals and are temporally related to defecation and meals. Peristaltic activity is decreased during sleep. This recording technique was reliable and well tolerated in all participants.

Download Full-text

DIAGNOSTIC RELIABILITY OF MEASUREMENT OF PREMATURE VENTRICULAR COMPLEX FREQUENCY RELATED TO DURATION OF AMBULATORY MONITORING

Journal of the American College of Cardiology ◽

10.1016/s0735-1097(21)01720-4 ◽

2021 ◽

Vol 77 (18) ◽

pp. 361

Author(s):

Linda Johnson ◽

Natan Napiorkowski ◽

Alexandra Måneheim ◽

Anders P. Persson ◽

Gunnar Engström ◽

...

Keyword(s):

Ambulatory Monitoring ◽

Premature Ventricular Complex ◽

Complex Frequency ◽

Diagnostic Reliability

Download Full-text

Diurnal Blood Pressure Variation in Quadriplegic Chronic Spinal Cord Injury Patients

Clinical Science ◽

10.1042/cs0800271 ◽

1991 ◽

Vol 80 (3) ◽

pp. 271-276 ◽

Cited By ~ 30

Author(s):

Henry Krum ◽

William J. Louis ◽

Douglas J. Brown ◽

Graham P. Jackman ◽

Laurence G. Howes

Keyword(s):

Blood Pressure ◽

Spinal Cord ◽

Heart Rate ◽

Spinal Cord Injury ◽

Ambulatory Monitoring ◽

Pressure Variation ◽

Night Time ◽

Cord Injury ◽

Blood Pressure Variation ◽

Neurologically Intact

1. Measurement of blood pressure and heart rate over a 24 h period was peformed in 10 quadriplegic spinal cord injury patients and 10 immobilized, neurologically intact orthopaedic subjects by using the Spacelabs 90207 automated ambulatory monitoring system. 2. Systolic and diastolic blood pressure fell significantly at night in orthopaedic subjects but not in quadriplegic patients, and night-time blood pressures were similar in both groups. 3. Cumulative summation of differences from a reference value (cusum analysis) confirmed a markedly diminished diurnal blood pressure variation in the quadriplegic patients. 4. These findings could not be accounted for on the basis of blood pressure variations during chronic postural change. 5. Heart rate fell significantly at night in both groups. 6. The findings suggest that the increase in blood pressure during waking hours in neurologically intact subjects is a consequence of a diurnal variation in sympathetic activity (absent in quadriplegic patients with sympathetic decentralization) which is independent of changes in physical activity.

Download Full-text