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AzTrials

HypertensionHIGHCARE-LAPSNCT04751292

HIGH Altitude CArdiovascular REsearch Latin America Population Study

An observational study of Hypertension and Cardiovascular Risk Factor, run by Istituto Auxologico Italiano at 1 site in Peru.

Completed

Finished. The study has ended and is not enrolling. Results may be posted on the official record.

Official record
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Trial summary

High blood pressure (BP) is one of the principal cardiovascular risk factors. While BP levels and hypertension prevalence are well characterized in many populations, information on BP and on cardiovascular risk profile in high altitude inhabitants is limited and frequently contradictory, especially in the large… Read more about this study

Who is it for?
Ages 18 years and olderHealthy volunteers can take part
What is being tested?
Exposure to high altitude
How many people
937 participants
Where
1 sitePeru
Study dates
26 Jan 2021to 30 Dec 2023
Phase
Observational
Are there results?
None posted in the registry

Key requirements

Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.

  • Ages 18 years and older
  • All sexes
  • Healthy volunteers accepted
  • Adult, Older adult

Study population: Study participants will be recruited by random sampling from the general population residing permanently in urban areas at: 1. Sea level (lowlanders): <500m altitude (the city of Lima and surroundings, population 7.605.742) 2. High altitude (highlanders): * 2500-3500 m (Cajamarca, 2,720 m, population 283.767; Cuzco, 3,399 m, pop. 420.137; Huancayo, 3.287m, pop. 501.384) * 3500-4000 m Juliaca, 3,824 m, pop. 216.716, * >4000 m (Ananea, 4.616m, pop. 20.572; La Rinconada 5.100m, pop. 50.000; Cerro de Pasco, 4.300-4.700 m, pop. 70.000)

Who may be able to join

  • Adult (>18 years) male and female subjects;
  • Highlanders: permanence at high (>2500 m) altitude;
  • Lowlanders: permanence at low (<1500 m) altitude;
  • Written informed consent to participate in the study

Who cannot join

  • Lowlanders who over 3 months preceding inclusion in the study spent considerable (> 7 consecutive days) amount of time at altitudes above 1500 m;
  • Highlanders who over 3 months preceding inclusion in the study spent considerable (>7 consecutive days) amount of time at altitudes below 2500 m;
  • Subjects cognitively incapable of providing informed consent or responding to a questionnaire
  • Physical disability that would prevent study assessments from being performed
  • Active pulmonary tuberculosis
  • Pregnancy

Trial locations and contacts

1 site in 1 country.

Peru1 site
  • Universidad Peruana Cayetano Heredia

    Lima

Other trials in Peru

About this study

High blood pressure (BP) is one of the principal cardiovascular risk factors. While BP levels and hypertension prevalence are well characterized in many populations, information on BP and on cardiovascular risk profile in high altitude inhabitants is limited and frequently contradictory, especially in the large highland populations of South America. The information on the effects of permanent high altitude exposure on cardiovascular variables including BP may be relevant in the light of the known BP-increasing effect of acute exposure to high altitude hypoxia. This information may have practical implications for millions of people living at elevated altitudes in Asia, South America and Africa.

The inconclusive epidemiological evidence on BP and cardiovascular risk in high altitude dwellers may be the result of several factors, among them: 1) confounding by genetic and socio-economic factors; 2) imperfect methods of BP evaluation, in particular lack of data on ambulatory and home BP (both methods considered superior to conventional clinic BP in the assessment of exposure to high BP).

On this background, the general aim of the study is to compare blood pressure levels and cardiovascular risk profile among population-based samples of subjects residing in Peruvian communities living at different altitudes.

Being tested
Exposure to high altitude
Keywords
ambulatory blood pressure monitoring, echocardiography
Medical subject headings
Hypertension, Altitude Sickness, Polycythemia

What participants receive

What participants receive. In a randomised study each person is assigned to one group by chance.

  • Exposure to high altitudeOther

    permanence at high (>2500 m) altitude; permanence is defined as being born and living at high altitude with the total time spent at lower altitudes not exceeding 2 years in the past 10 years

Study groups in NCT04751292
Study groupRoleWhat they receive
LowlandersPeople living at low (<1500 m) altitude
HighlandersPeople living at high (>2500 m) altitude
Receives: Other: Exposure to high altitude

What is being measured

The primary outcome is the main question the study is designed to answer.

  1. Difference in 24 h ambulatory systolic BP between lowlanders and highlanders.

    Measured: baseline

Secondary outcomes (8)
  1. Differences in 24 h DBP, daytime and night-time systolic and diastolic BP between lowlanders and highlanders

    Measured: baseline

  2. Difference in conventional systolic and diastolic BP between lowlanders and highlanders

    Measured: baseline

  3. Difference in home systolic and diastolic BP between lowlanders and highlanders

    Measured: baseline

  4. Difference in sleep quality between lowlanders and highlanders

    Pittsburgh questionnaire (score)

    Measured: baseline

  5. Difference in sleep duration between lowlanders and highlanders

    self reported sleep duration (hours)

    Measured: baseline

  6. Difference in estimated cardiovascular risk

    Measured: baseline

  7. Difference between lowlanders and highlanders in hypertension prevalence

    Measured: baseline

  8. Difference in a number of BP variables between highlanders living at three high altitude levels

    Measured: baseline

Timeline

From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.

  1. First posted12 Feb 2021
  2. Study start26 Jan 2021
  3. Primary completion30 Dec 2023
  4. Study completion30 Dec 2023

Resources

More details

For doctors and researchers: how the study is designed, who runs it, and its registry IDs.

Study design
Study type
Observational
Observational model
Ecologic or community
Time perspective
Cross-sectional
Enrolment
937 participants (actual)
IDs, dates and publications
ClinicalTrials.gov ID
NCT04751292
Sponsor's protocol ID
09A921
Acronym
HIGHCARE-LAPS
Status last verified
Feb 2024
First submitted
2 Feb 2021
Last updated
1 Mar 2024
Results posted
No
FDA-regulated drug
No
FDA-regulated device
No
Individual data sharing
Yes: The data will be placed in a public repository and available upon reasonable request after study completion

Publications

  • Bilo G, Acone L, Anza-Ramirez C, Macarlupu JL, Soranna D, Zambon A, Vizcardo-Galindo G, Pengo MF, Villafuerte FC, Parati G; HIGHCARE-ANDES Highlanders Study Investigators. Office and Ambulatory Arterial Hypertension in Highlanders: HIGHCARE-ANDES Highlanders Study. Hypertension. 2020 Dec;76(6):1962-1970. doi: 10.1161/HYPERTENSIONAHA.120.16010. Epub 2020 Nov 11.

    PubMed 33175629
  • Torlasco C, Bilo G, Giuliano A, Soranna D, Ravaro S, Oliverio G, Faini A, Zambon A, Lombardi C, Parati G. Effects of acute exposure to moderate altitude on blood pressure and sleep breathing patterns. Int J Cardiol. 2020 Feb 15;301:173-179. doi: 10.1016/j.ijcard.2019.09.034. Epub 2019 Oct 30.

    PubMed 31780104
  • Bilo G, Caravita S, Torlasco C, Parati G. Blood pressure at high altitude: physiology and clinical implications. Kardiol Pol. 2019 Jun 25;77(6):596-603. doi: 10.33963/KP.14832. Epub 2019 May 17.

    PubMed 31099758
  • Hainsworth R, Drinkhill MJ. Cardiovascular adjustments for life at high altitude. Respir Physiol Neurobiol. 2007 Sep 30;158(2-3):204-11. doi: 10.1016/j.resp.2007.05.006. Epub 2007 May 18.

    PubMed 17597013
  • Parati G, Agostoni P, Basnyat B, Bilo G, Brugger H, Coca A, Festi L, Giardini G, Lironcurti A, Luks AM, Maggiorini M, Modesti PA, Swenson ER, Williams B, Bartsch P, Torlasco C. Clinical recommendations for high altitude exposure of individuals with pre-existing cardiovascular conditions: A joint statement by the European Society of Cardiology, the Council on Hypertension of the European Society of Cardiology, the European Society of Hypertension, the International Society of Mountain Medicine, the Italian Society of Hypertension and the Italian Society of Mountain Medicine. Eur Heart J. 2018 May 1;39(17):1546-1554. doi: 10.1093/eurheartj/ehx720.

    PubMed 29340578
  • Duplain H, Vollenweider L, Delabays A, Nicod P, Bartsch P, Scherrer U. Augmented sympathetic activation during short-term hypoxia and high-altitude exposure in subjects susceptible to high-altitude pulmonary edema. Circulation. 1999 Apr 6;99(13):1713-8. doi: 10.1161/01.cir.99.13.1713.

    PubMed 10190881
  • Hansen J, Sander M. Sympathetic neural overactivity in healthy humans after prolonged exposure to hypobaric hypoxia. J Physiol. 2003 Feb 1;546(Pt 3):921-9. doi: 10.1113/jphysiol.2002.031765.

    PubMed 12563015
  • Bartsch P, Gibbs JS. Effect of altitude on the heart and the lungs. Circulation. 2007 Nov 6;116(19):2191-202. doi: 10.1161/CIRCULATIONAHA.106.650796. No abstract available.

    PubMed 17984389
  • Higgins JP, Tuttle T, Higgins JA. Altitude and the heart: is going high safe for your cardiac patient? Am Heart J. 2010 Jan;159(1):25-32. doi: 10.1016/j.ahj.2009.10.028.

    PubMed 20102863
  • Bilo G, Caldara G, Styczkiewicz K, Revera M, Lombardi C, Giglio A, Zambon A, Corrao G, Faini A, Valentini M, Mancia G, Parati G. Effects of selective and nonselective beta-blockade on 24-h ambulatory blood pressure under hypobaric hypoxia at altitude. J Hypertens. 2011 Feb;29(2):380-7. doi: 10.1097/HJH.0b013e3283409014.

    PubMed 21045724
  • Parati G, Bilo G, Faini A, Bilo B, Revera M, Giuliano A, Lombardi C, Caldara G, Gregorini F, Styczkiewicz K, Zambon A, Piperno A, Modesti PA, Agostoni P, Mancia G. Changes in 24 h ambulatory blood pressure and effects of angiotensin II receptor blockade during acute and prolonged high-altitude exposure: a randomized clinical trial. Eur Heart J. 2014 Nov 21;35(44):3113-22. doi: 10.1093/eurheartj/ehu275. Epub 2014 Aug 26.

    PubMed 25161182
  • Bilo G, Villafuerte FC, Faini A, Anza-Ramirez C, Revera M, Giuliano A, Caravita S, Gregorini F, Lombardi C, Salvioni E, Macarlupu JL, Ossoli D, Landaveri L, Lang M, Agostoni P, Sosa JM, Mancia G, Parati G. Ambulatory blood pressure in untreated and treated hypertensive patients at high altitude: the High Altitude Cardiovascular Research-Andes study. Hypertension. 2015 Jun;65(6):1266-72. doi: 10.1161/HYPERTENSIONAHA.114.05003. Epub 2015 Apr 20.

    PubMed 25895588
  • Savla JJ, Levine BD, Sadek HA. The Effect of Hypoxia on Cardiovascular Disease: Friend or Foe? High Alt Med Biol. 2018 Jun;19(2):124-130. doi: 10.1089/ham.2018.0044.

    PubMed 29939783
  • Aryal N, Weatherall M, Bhatta YK, Mann S. Blood Pressure and Hypertension in Adults Permanently Living at High Altitude: A Systematic Review and Meta-Analysis. High Alt Med Biol. 2016 Sep;17(3):185-193. doi: 10.1089/ham.2015.0118. Epub 2016 Aug 30.

    PubMed 27575245
  • Beall CM. Andean, Tibetan, and Ethiopian patterns of adaptation to high-altitude hypoxia. Integr Comp Biol. 2006 Feb;46(1):18-24. doi: 10.1093/icb/icj004. Epub 2006 Jan 6.

    PubMed 21672719

Questions about this trial

What is this clinical trial studying?

An observational study of Hypertension and Cardiovascular Risk Factor, run by Istituto Auxologico Italiano at 1 site in Peru.

The full registered description is in the About this study section and the official record.

Who may be eligible to take part?

The sponsor lists 4 inclusion and 6 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.

Is this clinical trial currently recruiting?

The record says: finished, as of the sponsor's last update on 1 Mar 2024. Status can change between updates, so confirm with the study contact before making plans.

Where is the study taking place?

The record lists 1 site in Peru. Whether a site is taking part right now should be confirmed with that site. See every site.

What are the possible benefits and risks?

They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.

Are results available for this study?

The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.

How can a doctor refer a patient or contact the research team?

The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.

What does the primary outcome measure?

Difference in 24 h ambulatory systolic BP between lowlanders and highlanders. (time frame: baseline). It is what the study was designed to measure, not a finding.

Where can I read the original study information?

On the ClinicalTrials.gov record for NCT04751292, which also lists 20 linked publications.

Does a listing mean the treatment is approved or proven to work?

No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.

How often is this information updated?

AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 1 Mar 2024.

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