在持續(xù)應(yīng)用了6年之后，以項研究證實了Spacelabs醫(yī)療公司的動態(tài)血壓監(jiān)測器（ABP）的精確性。

研究人員使用了模擬器來常規(guī)檢查15臺Spacelabs公司ABP設(shè)備的精確性（大多數(shù)型號是90207），這些設(shè)備是從1998~2004年在英國愛丁堡的西部總醫(yī)院心血管風(fēng)險診所中使用的。研究方案設(shè)計用于測試設(shè)備在低血壓、正常血壓和高血壓條件下的狀態(tài)。檢查記錄的數(shù)據(jù)評估設(shè)備的遠(yuǎn)期的協(xié)調(diào)性和可靠性。

在被檢測的1920套設(shè)備中，只有1套超出了Spacelabs使用模擬波形記錄所預(yù)期的通常認(rèn)可的壓力范圍，而且這套設(shè)備超出界限只有1mmHg。協(xié)調(diào)性標(biāo)準(zhǔn)要求設(shè)備記錄的收縮壓、舒張壓、和平均動脈壓的標(biāo)準(zhǔn)差在2mmHg以內(nèi)，至少2/3在2mmHg以內(nèi)。在測試中，設(shè)備記錄到的平均壓力有幾乎90%的數(shù)值，在連續(xù)檢測間隙都在2mmHg之內(nèi)，絕大多數(shù)都小于1mmHg。

心血管風(fēng)險診所的內(nèi)科醫(yī)生Sister Gough解釋說：“在西部總醫(yī)院，在第一次臨床咨詢之前，每1位在心血管風(fēng)險診所的患者都接受了24小時動態(tài)血壓監(jiān)測。Spacelabs的動態(tài)血壓監(jiān)測在我們診所得到了很好使用。監(jiān)測器被計劃在24小時的時間內(nèi)，按照30分鐘的循環(huán)記錄血壓，而且鼓勵患者在日常活動中繼續(xù)佩帶監(jiān)測器監(jiān)測血壓。我們的監(jiān)測成功率超過了95%。”

西部總醫(yī)院的維護(hù)記錄顯示，大多數(shù)血壓監(jiān)測設(shè)備需要中斷維持的機會，每3年不到1次，沒有設(shè)備需要維修的次數(shù)超過每年以一次。

Valdidating Blood Pressure Monitors
 
Following six years of continuous use, a study has validated the accuracy of the ambulatory blood pressure (ABP) monitors of Spacelabs Medical (Issaquah, WA, USA).

The researchers used a simulator to routinely check the accuracy of 15 Spacelabs ABP devices (most were model 90207) in use at the Cardiovascular Risk Clinic at the Western General Hospital in Edinburgh (UK) from 1998-2004. The protocol was designed to test the devices over a range of low, normal, and high pressures. The records were examined to assess the long-term consistency and reliability of the devices.

Out of the 1,920 sets measured, only one was outside the generally accepted limits of the pressure expected from the Spacelabs records with the simulated waveforms, and that one exceeded the limits by only 1 mmHg. The criteria for consistency call for the standard deviation of the systolic, diastolic, and mean arterial pressures recorded to be within 3 mmHg, with at least two-thirds within 2 mmHg. In the test, nearly 90% of the average pressures recorded by any device remained within 2 mmHg of their recordings at successive test intervals. Most differences were less than 1 mmHg.

“At the Western General Hospital each patient referred to the Cardiovascular Risk Clinic has 24-hour ambulatory blood pressure monitoring prior to their first clinical consultation,” explained Sister Gough, a physician at the Cardiovascular Risk Clinic. “Spacelabs ambulatory blood pressure monitors are used exclusively at our clinic. The monitors are programmed to record blood pressure measurements at 30-minute cycles over a 24-hour period and patients are encouraged to continue with their normal daily activities while wearing the monitor. We achieve a monitoring success rate in excess of 95%.”

Maintenance records at the Western General Hospital showed that most blood pressure monitoring devices required breakdown maintenance less than once every three years, with no devices requiring repair more than once a year.