在健康的人群中,长达4天的高空暴露会延长QTc
Koa Gudelunas1,2, Gregory A Chinn1, Odmara L Barreto-Chang1
1Department of Anesthesia and Perioperative Care, University of California, San Francisco, San Francisco, CA.
Wilderness & environmental medicine
|February 24, 2025
概括
高空暴露显著延长健康成年人的QTc间隔,增加超过20毫秒. 这种高度诱导的QTc延长发生在不依赖于氧和或电解质水平的情况下.
科学领域:
- 心脏病学 心脏病学
- 高度生理学 高度生理学
- 环境医学 环境医学
背景情况:
- 长QTc综合征是致命腹腔失常的危险因素.
- 了解对心脏电生理学的环境影响对于患者安全至关重要.
研究的目的:
- 为了研究快速上升和长时间在高空停留对QTc间隔的影响.
- 为了确定高空暴露是否会改变健康成年人的心脏再极化.
主要方法:
- 107名健康成年人的心电图 (ECG) 被记录在海平面上,16小时后和86小时后在3800米处.
- 使用弗里德里西亚公式 (QTcF) 计算QTc间隔.
- 多变量分析评估了高度,SpO2和电解质对QTc间隔的影响.
主要成果:
- 平均QTcF从海平面上的404±17毫秒增加到高海拔86小时后的427±24毫秒.
- 61%的参与者表现出比基线超过20毫秒的QTc延长.
- 12名参与者在海拔高度达到延长QTc综合征 (>450毫秒男性,>470毫秒女性) 的标准.
- 这种QTc延长独立于血清电解质和SpO2.2的变化.
结论:
- 快速上升和在高海拔处停留多天可以显著延长健康成人的QTc间隔.
- 观察到的QTc延长是高空暴露的直接影响,不能归因于低氧症或电解质转移.
- 需要进一步的研究来确定这种高度诱导的QTc延长是否会增加易感个体的torsades de pointes的风险.
相关概念视频
01:15Chronopharmacokinetics: Circadian Rhythms and Influence on Drug Response
40
Circadian rhythms are cyclic changes that are crucial in plasma drug concentrations. Various standard circadian parameters, including core body temperature, heart rate, and other cardiovascular factors, directly impact disease states and the therapeutic response to drug therapy.
The time of drug administration is an important factor to consider, as it can influence the toxic dose of a drug. For example, a study conducted by Prins et al. in 1997 examined the effects of the timing of...
The time of drug administration is an important factor to consider, as it can influence the toxic dose of a drug. For example, a study conducted by Prins et al. in 1997 examined the effects of the timing of...
40
01:26Exercise Stress Test
152
Introduction
Exercise stress testing, commonly known as a treadmill test, is a noninvasive procedure used to evaluate cardiovascular function and diagnose heart conditions.
Definition
An exercise stress test measures the heart's response to exertion using a treadmill or stationary bicycle. Chest electrodes record the heart's electrical activity through an ECG, and blood pressure is monitored regularly.
Purposes
Exercise stress testing, commonly known as a treadmill test, is a noninvasive procedure used to evaluate cardiovascular function and diagnose heart conditions.
Definition
An exercise stress test measures the heart's response to exertion using a treadmill or stationary bicycle. Chest electrodes record the heart's electrical activity through an ECG, and blood pressure is monitored regularly.
Purposes
152
01:29Electrocardiogram
2.1K
An electrocardiogram (ECG or EKG) is a critical diagnostic tool that records the electrical signals produced by the heart during each heartbeat. This recording is achieved through electrodes placed strategically on the arms, legs, and chest. The electrocardiograph amplifies these signals and produces 12 distinct tracings, offering a comprehensive understanding of the heart's electrical activity.
Three major waveforms are present in a typical ECG recording: the P wave, the QRS complex, and...
Three major waveforms are present in a typical ECG recording: the P wave, the QRS complex, and...
2.1K