{
  "api_version": "1",
  "request": {
    "url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=observational+study&page=33",
    "query": {
      "intervention": "observational study",
      "page": 33
    },
    "page_size": 10
  },
  "pagination": {
    "page": 33,
    "page_size": 10,
    "total_count": 4385,
    "total_pages": 439,
    "next_page_url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=observational+study&page=34&page_size=10",
    "previous_page_url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=observational+study&page=32&page_size=10"
  },
  "source": "remote",
  "last_synced_at": "2026-10-20T08:39:02.077Z",
  "attribution": "Data derived from public ClinicalTrials.gov records. The official record at https://clinicaltrials.gov/ remains the source of truth for current availability, contacts, and full study details.",
  "notes": [
    "This endpoint exposes only public summary fields — no participant contact emails, phone numbers, or scraped investigator contact details.",
    "For contact information and full protocol detail, follow each trial's `official_url` to the ClinicalTrials.gov record.",
    "This API is a navigational aid. It does not provide medical advice, eligibility determinations, or compensation guarantees."
  ],
  "trials": [
    {
      "nct_id": "NCT04478890",
      "title": "Hemodynamic Assessment of the Right Ventricle Using Pressure-volume Loop Catheter and Pulmonary Artery Catheter in Patients Undergoing Left Ventricular Assist Device Placement",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Right Ventricular Dysfunction"
      ],
      "interventions": [
        {
          "name": "Hemodynamic assessment",
          "type": "DIAGNOSTIC_TEST"
        }
      ],
      "intervention_types": [
        "DIAGNOSTIC_TEST"
      ],
      "sponsor": "University of Minnesota",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 4,
      "start_date": "2021-08-01",
      "completion_date": "2024-12-31",
      "has_results": false,
      "last_update_posted_date": "2025-02-04",
      "last_synced_at": "2026-10-20T08:39:02.077Z",
      "location_count": 1,
      "location_summary": "Minneapolis, Minnesota",
      "locations": [
        {
          "city": "Minneapolis",
          "state": "Minnesota"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT04478890"
    },
    {
      "nct_id": "NCT00709397",
      "title": "HIV-1 Viral Dynamics in Subjects Initiating Raltegravir Therapy",
      "overall_status": "TERMINATED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "HIV-1 Infection"
      ],
      "interventions": [
        {
          "name": "blood drawing",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER"
      ],
      "sponsor": "Brigham and Women's Hospital",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 3,
      "start_date": "2008-06",
      "completion_date": "2009-12",
      "has_results": false,
      "last_update_posted_date": "2010-08-02",
      "last_synced_at": "2026-10-20T08:39:02.077Z",
      "location_count": 2,
      "location_summary": "Boston, Massachusetts",
      "locations": [
        {
          "city": "Boston",
          "state": "Massachusetts"
        },
        {
          "city": "Boston",
          "state": "Massachusetts"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00709397"
    },
    {
      "nct_id": "NCT03423160",
      "title": "A Novel Framework for Impaired Imitation in ASD",
      "overall_status": "ACTIVE_NOT_RECRUITING",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Autism Spectrum Disorder"
      ],
      "interventions": [
        {
          "name": "None--observational",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER"
      ],
      "sponsor": "Hugo W. Moser Research Institute at Kennedy Krieger, Inc.",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "8 Years",
        "maximum_age": "12 Years",
        "sex": "ALL",
        "summary": "8 Years to 12 Years"
      },
      "enrollment_count": 201,
      "start_date": "2018-04-24",
      "completion_date": "2028-12-31",
      "has_results": false,
      "last_update_posted_date": "2026-04-27",
      "last_synced_at": "2026-10-20T08:39:02.077Z",
      "location_count": 1,
      "location_summary": "Baltimore, Maryland",
      "locations": [
        {
          "city": "Baltimore",
          "state": "Maryland"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT03423160"
    },
    {
      "nct_id": "NCT07664579",
      "title": "Investigating the Feasibility and Acceptability of an Innovative Interdisciplinary Supportive Care Program: Couples Coping Together Against Cancer",
      "overall_status": "RECRUITING",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Anatomic Stage IV Breast Cancer AJCC v8",
        "Glioblastoma",
        "Lung Carcinoma",
        "Malignant Solid Neoplasm",
        "Metastatic Breast Carcinoma"
      ],
      "interventions": [
        {
          "name": "Non-Interventional Study",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER"
      ],
      "sponsor": "City of Hope Medical Center",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 160,
      "start_date": "2024-07-05",
      "completion_date": "2026-11-16",
      "has_results": false,
      "last_update_posted_date": "2026-06-24",
      "last_synced_at": "2026-10-20T08:39:02.077Z",
      "location_count": 1,
      "location_summary": "Duarte, California",
      "locations": [
        {
          "city": "Duarte",
          "state": "California"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT07664579"
    },
    {
      "nct_id": "NCT01993862",
      "title": "Same Day Discharge (SDD) After Implantable Cardioverter Defibrillator (ICD) Implant",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Heart Failure",
        "Coronary Artery Disease"
      ],
      "interventions": [
        {
          "name": "Same Day Discharge",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER"
      ],
      "sponsor": "Abbott Medical Devices",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 266,
      "start_date": "2014-03-17",
      "completion_date": "2016-08-12",
      "has_results": false,
      "last_update_posted_date": "2019-02-04",
      "last_synced_at": "2026-10-20T08:39:02.077Z",
      "location_count": 28,
      "location_summary": "Huntsville, Alabama • Mobile, Alabama • Phoenix, Arizona + 23 more",
      "locations": [
        {
          "city": "Huntsville",
          "state": "Alabama"
        },
        {
          "city": "Mobile",
          "state": "Alabama"
        },
        {
          "city": "Phoenix",
          "state": "Arizona"
        },
        {
          "city": "Chula Vista",
          "state": "California"
        },
        {
          "city": "Fresno",
          "state": "California"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01993862"
    },
    {
      "nct_id": "NCT05893459",
      "title": "Beneficial or Fostering Future Struggles (B.F.F.s)? Characterizing the Role of Friends in the Development of 13- to 17-Year-Old Adolescents",
      "overall_status": "UNKNOWN",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Child Maltreatment",
        "Interpersonal Relations",
        "Victimisation",
        "Psychopathology",
        "Electrocardiography"
      ],
      "interventions": [
        {
          "name": "Debrief",
          "type": "BEHAVIORAL"
        }
      ],
      "intervention_types": [
        "BEHAVIORAL"
      ],
      "sponsor": "University of South Carolina",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "13 Years",
        "maximum_age": "17 Years",
        "sex": "ALL",
        "summary": "13 Years to 17 Years"
      },
      "enrollment_count": 120,
      "start_date": "2023-12-02",
      "completion_date": "2025-03-01",
      "has_results": false,
      "last_update_posted_date": "2024-07-16",
      "last_synced_at": "2026-10-20T08:39:02.077Z",
      "location_count": 1,
      "location_summary": "Columbia, South Carolina",
      "locations": [
        {
          "city": "Columbia",
          "state": "South Carolina"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT05893459"
    },
    {
      "nct_id": "NCT07444580",
      "title": "PrP-targeting siRNA Safety & Mechanism Study",
      "overall_status": "RECRUITING",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE1"
      ],
      "conditions": [
        "Prion Disease"
      ],
      "interventions": [
        {
          "name": "PrP-siRNA",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Broad Institute of MIT and Harvard",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 45,
      "start_date": "2026-05-15",
      "completion_date": "2029-08-14",
      "has_results": false,
      "last_update_posted_date": "2026-10-16",
      "last_synced_at": "2026-10-20T08:39:02.077Z",
      "location_count": 5,
      "location_summary": "Boston, Massachusetts • Rochester, Minnesota • New York, New York + 2 more",
      "locations": [
        {
          "city": "Boston",
          "state": "Massachusetts"
        },
        {
          "city": "Rochester",
          "state": "Minnesota"
        },
        {
          "city": "New York",
          "state": "New York"
        },
        {
          "city": "Cleveland",
          "state": "Ohio"
        },
        {
          "city": "Nashville",
          "state": "Tennessee"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT07444580"
    },
    {
      "nct_id": "NCT05986279",
      "title": "Improving Psychological and Vestibular Health: MINDGAPS",
      "overall_status": "RECRUITING",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Vestibular Hypofunction"
      ],
      "interventions": [
        {
          "name": "Rehab",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER"
      ],
      "sponsor": "University of Montana",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 500,
      "start_date": "2023-08-30",
      "completion_date": "2027-09-29",
      "has_results": false,
      "last_update_posted_date": "2024-12-06",
      "last_synced_at": "2026-10-20T08:39:02.077Z",
      "location_count": 2,
      "location_summary": "San Diego, California • Missoula, Montana",
      "locations": [
        {
          "city": "San Diego",
          "state": "California"
        },
        {
          "city": "Missoula",
          "state": "Montana"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT05986279"
    },
    {
      "nct_id": "NCT01818518",
      "title": "Neonatal Outcome by Reason for Delivery",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Preterm Delivery"
      ],
      "interventions": [],
      "intervention_types": [],
      "sponsor": "Obstetrix Medical Group",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "65 Years",
        "sex": "FEMALE",
        "summary": "18 Years to 65 Years · Female only"
      },
      "enrollment_count": 995,
      "start_date": "2013-07",
      "completion_date": "2016-07-25",
      "has_results": true,
      "last_update_posted_date": "2019-06-18",
      "last_synced_at": "2026-10-20T08:39:02.077Z",
      "location_count": 10,
      "location_summary": "Mesa, Arizona • Phoenix, Arizona • Scottsdale, Arizona + 7 more",
      "locations": [
        {
          "city": "Mesa",
          "state": "Arizona"
        },
        {
          "city": "Phoenix",
          "state": "Arizona"
        },
        {
          "city": "Scottsdale",
          "state": "Arizona"
        },
        {
          "city": "Laguna Hills",
          "state": "California"
        },
        {
          "city": "San Jose",
          "state": "California"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01818518"
    },
    {
      "nct_id": "NCT04661982",
      "title": "Long Term Follow-Up in Patients With Stage 0-IIIC Breast Cancer",
      "overall_status": "ACTIVE_NOT_RECRUITING",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Breast Cancer"
      ],
      "interventions": [
        {
          "name": "Long-term Follow-up",
          "type": "OTHER"
        },
        {
          "name": "Questionnaire Administration",
          "type": "OTHER"
        },
        {
          "name": "Quality-of-Life Assessment",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER"
      ],
      "sponsor": "City of Hope Medical Center",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": null,
        "maximum_age": null,
        "sex": "ALL",
        "summary": "Not listed"
      },
      "enrollment_count": 500,
      "start_date": "2010-07-06",
      "completion_date": "2026-11-24",
      "has_results": false,
      "last_update_posted_date": "2025-12-05",
      "last_synced_at": "2026-10-20T08:39:02.077Z",
      "location_count": 1,
      "location_summary": "Duarte, California",
      "locations": [
        {
          "city": "Duarte",
          "state": "California"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT04661982"
    }
  ]
}