Objective Assessment of Cough Suppressants under Clinical Conditions Using a Tape Recorder System

Woolf, C. R.; Rosenberg, Anna G W

doi:10.1136/thx.19.2.125

Cited by 47 publications

(28 citation statements)

References 5 publications

(5 reference statements)

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“…The sensitivity of the trigger for recording was set for each subject and was the minimum threshold trigger for the EMG recording. Because EMG signals were used to trigger the recorder, this produced less extraneous signals to be recorded compared to previous recorder systems triggered by sound [15,16]. The magnitude of the signals was not affected whilst in the prone position, and does not explain the lower frequency of coughs whilst lying supine in bed.…”

Section: Discussionmentioning

confidence: 99%

“…The major advantages of our recording system include portability, which interferes to a minimum with the subject's mobility, and a relatively rapid and dependable counting of the cough frequency during the 24 h cycle. Although microphones connected to a tape-recorder have been used in the past to record cough frequency [15,16], counting of the cough numbers could only be performed in real time. In our recording system, the coughing events can be rapidly scanned and counts of individual coughs be made.…”

Section: Discussionmentioning

confidence: 99%

“…Recording of the pneumogram onto a kymograph has also been used to examine the intensity and duration of cough [14]. Cough was later recorded on a tape-recorder, using microphones either fixed on the wall of the patient's room or placed in close contact with the patient's throat [15,16]. In these studies, the effects of antitussive agents were investigated under conditions where the mobility of the patient was restricted to the room.…”

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confidence: 99%

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Coughing frequency in patients with persistent cough: assessment using a 24 hour ambulatory recorder

Hsu¹,

Stone²,

et al. 1994

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C Co ou ug gh hi in ng g f fr re eq qu ue en nc cy y i in n p pa at ti ie en nt ts s w wi it th h p pe er rs si is st te en nt t c co ou ug gh h: : a as ss se es ss sm me en nt t u us si in ng g a a 2 24 4 h ho ou ur r a am mb bu ul la at to or ry y r re ec co or rd de er r ABSTRACT: Cough is an important symptom of many respiratory disorders. We determined the frequency and diurnal variation of cough in normal subjects and in patients with asthma or with persistent cough of unknown cause. We used a portable, solid-state, multiple-channel recorder to record cough sounds over a 24 h period. The audio-signal was recorded from a unidirectional microphone strapped over the chest wall, and electromyographic (EMG) signals from the lower respiratory muscles were simultaneously registered with surface electrodes. The recorded digital data were examined on an IBM-compatible computer, and the typical signals induced by cough (as assessed by voluntary or experimentally-induced cough) were counted.In 12 normal subjects, only 0-16 coughs were recorded over 24 h. In 21 stable asthmatics with a history of chronic cough ("asthma") the median number was 282 (ranges: 45-1,577), and in 14 patients with the predominant symptom of daily dry coughs ("chronic coughers") the median number was 794 (64-3,639). In both groups of patients, there was a diurnal variation of coughs, such that the least numbers occurred between 2 and 5 a.m. (<3% of total). In the asthma group, there was no significant correlation between forced expiratory volume in one second (FEV 1 ) (% predicted) or diurnal variation of peak expiratory flow and cough frequency. In the chronic coughers, there was a significant correlation between daytime cough numbers and daytime cough symptom scores but not for the night-time values.Our data show that cough frequency is not determined by the severity of asthma in relatively stable asthmatics on inhaled steroids, and is reduced during sleep in both asthmatics and chronic cough patients. This portable cough recorder may be useful in the assessment of drug therapy for chronic cough.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 99%

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Coughing frequency in patients with persistent cough: assessment using a 24 hour ambulatory recorder

Hsu¹,

Stone²,

et al. 1994

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“…The very first cough monitoring systems to be developed were nonambulatory; mains-supplied tape recorders with free-field microphones were used to measure cough in hospital inpatients or study subjects overnight [67,70]. Similar systems can be used for documenting coughing in cough challenge studies.…”

Section: Nonambulatory Methods Of Cough Recordingmentioning

confidence: 99%

ERS guidelines on the assessment of cough

Morice¹,

Fontana²,

Belvisi³

et al. 2007

Eur Respir J

613

619

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“…Manual cough counts from sound recordings (cough events counted by a human listener) have been used since the 1950s (7)(8)(9). Modern sound-based cough monitors make use of compact digital recording devices that are now available.…”

Section: Introductionmentioning

confidence: 99%

Cough frequency monitors: can they discriminate patient from environmental coughs?

et al. 2016

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Background: Objective cough frequency measurements are increasingly applied in clinical research.Technological advances enable automated detection and counting of cough events from sound recordings of many hours' duration. A possible limitation of sound-based cough frequency measurement is the contamination of recordings by environmental coughs (coughs from persons other than the patient). This study aimed to investigate the accuracy of a sound-based cough monitor for detecting and discriminating patient cough from environmental cough. Methods: As part of a stroke trial (ISRCTN40298220), patients on a hospital ward underwent 15-minute recordings using the Leicester Cough Monitor (LCM), a sound-based cough monitor ('semi-automated counts'). Participants and other persons in the environment were prompted to cough. An observer present in the room recorded the number of patient and environmental coughs ('live counts'). LCM counts were also compared against a manual cough count, the most commonly used gold standard to determine accuracy ('manual sound counts' from listening to recordings), by a blinded assessor who cross-referenced timed cough events from the respective methods. Data for automated, manual and live cough counts were analyzed using agreement statistics. Results: On sound recordings from five patients, there were 65 patient coughs and 78 environmental coughs (manual counts). Absolute agreement for patient cough count between all three measurement methods (LCM automated, live, and manual sound counts) was high, with intra-class correlation coefficient

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Objective Assessment of Cough Suppressants under Clinical Conditions Using a Tape Recorder System

Cited by 47 publications

References 5 publications

Coughing frequency in patients with persistent cough: assessment using a 24 hour ambulatory recorder

Coughing frequency in patients with persistent cough: assessment using a 24 hour ambulatory recorder

ERS guidelines on the assessment of cough

Cough frequency monitors: can they discriminate patient from environmental coughs?

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