The Science Journal of the American Association for Respiratory Care

2001 OPEN FORUM Abstracts

Evaluation of Noise Levels Generated by Mechanical Ventilators on Conventional Adult Settings

Frank Miller, RRT,Eric Davis, RRT. Respiratory Department, Mayo Clinic Hospital, Scottsdale, AZ.

Many studies have evaluated thenoise generated by high frequency ventilators or environmental conditions inthe ICU setting. However, little information on noise generated by ventilatorson conventional adult settings is available. We questioned what the differencein noise levels generated by different ventilators on conventional adult settingswas and how it differed by location to the patient. We evaluated the noise generatedby eight different ventilators from each side of a patient?s bed.

Methods: The Puritan Bennett760, 760 (with modified expiratory device), 840 and 7200, Bear 3, Siemens 900Cand 300A, and Versamed I-Vent were evaluated using two Puritan Bennett 500ccheavy-duty test lungs. Each ventilator was placed on conventional adult settings(FIO2 0.50, VT 750ml, Rate 12, Peep 5.0, Flow 60 l/m) and evaluatedfrom equal distances of 33 inches from head center on both sides of an ICU bed.Noise levels were measured using a Simpson, model 884, sound level meter, calibratedusing a Simpson B90 sound level calibrator at 114 dBA.

Results: measured in dBA

RightSidePeak Insp.Peak Exp.Mean Insp.Mean Exp.Mean Noise
PB 84050 (+0.4)57 (+0.4)49 (+0.5) 53 (+0.6)51 (+1.9)
PB 76054 (+0.4)71 (+0.4) 54 (+0.7) 60 (+0.6) 57 (+3.4)
PB 760(modified)53 (+0.4) 67 (+0.3) 53 (+0.3) 59 (+0.4) 56 (+2.9)
PB 720056 (+0.6) 56 (+0.2)56 (+0.4) 56 (+0.4) 56 (+0.4)

Bear 3

58 (+0.6) 55 (+0.3) 56 (+0.5) 55 (+0.3) 56 (+0.6)
Servo 900C 59 (+0.5) 61 (+0.7) 57 (+0.6) 59 (+0.8) 58 (+1.3)
Servo300 52 (+0.3) 61 (+0.5) 51 (+0.7) 57 (+0.5) 54 (+3.1)
VersamedI-Vent 57 (+0.6) 66 (+0.4) 57 (+0.5) 62 (+0.7) 59 (+2.6)
Left Side
PB 840 51 (+0.2) 57 (+0.2) 49 (+0.2)53 (+0.4) 51 (+2.0)
PB 760 53 (+0.3) 64 (+0.3) 52 (+0.4) 56 (+0.3) 54 (+2.1)
PB 760(modified) 51 (+0.2) 61 (+0.3) 51 (+0.3) 55 (+0.4) 53 (+2.1)
PB 720058 (+0.7) 58 (+0.3) 58 (+0.4) 58 (+0.6) 58 (+0.5)
Bear 3 57 (+0.5) 59 (+0.7)56 (+0.4) 58 (+0.3) 57 (+1.0)
Servo900C 56 (+0.6) 65 (+0.3) 56 (+0.4) 61 (+0.5)57 (+0.9)
Servo300 54 (+0.5) 61 (+0.7) 50 (+0.5) 56 (+0.4) 53 (+2.8)
VersamedI-Vent 61 (+0.6) 69 (+0.5) 59 (+0.5) 65 (+0.5) 62 (+3.0)

Conclusions: Noise levelsnot only vary from ventilator to ventilator, but several ventilators vary innoise based on their location to the patient, which may impact patient comfortand care. The PB 840 appears to generate the lowest noise levels of all ventilatorsevaluated and modifications to the PB 760 expiratory system have reduced bothpeak and mean noise levels. The PB 760 generates the greatest peak noise onthe patient?s right side, while the Versamed I-Vent generates the greatest peaknoise on the patients left side. The Versamed I-Vent appears to generate thehighest overall mean noise levels.

Ventilators were supplied by MayoClinic, Universal Hospital Inc. and MEDIQ PRN.

OF-01-159

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