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extensions/default/src/hooks/usePatientInfo.tsx

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+import { useState, useEffect } from 'react';
+import { utils } from '@ohif/core';
+
+const { formatPN, formatDate } = utils;
+
+function usePatientInfo(servicesManager: AppTypes.ServicesManager) {
+  const { displaySetService } = servicesManager.services;
+
+  const [patientInfo, setPatientInfo] = useState({
+    PatientName: '',
+    PatientID: '',
+    PatientSex: '',
+    PatientDOB: '',
+  });
+  const [isMixedPatients, setIsMixedPatients] = useState(false);
+  const displaySets = displaySetService.getActiveDisplaySets();
+
+  const checkMixedPatients = PatientID => {
+    const displaySets = displaySetService.getActiveDisplaySets();
+    let isMixedPatients = false;
+    displaySets.forEach(displaySet => {
+      const instance = displaySet?.instances?.[0] || displaySet?.instance;
+      if (!instance) {
+        return;
+      }
+      if (instance.PatientID !== PatientID) {
+        isMixedPatients = true;
+      }
+    });
+    setIsMixedPatients(isMixedPatients);
+  };
+
+  const updatePatientInfo = () => {
+    const displaySet = displaySets[0];
+    const instance = displaySet?.instances?.[0] || displaySet?.instance;
+    if (!instance) {
+      return;
+    }
+    setPatientInfo({
+      PatientID: instance.PatientID || null,
+      PatientName: instance.PatientName ? formatPN(instance.PatientName.Alphabetic) : null,
+      PatientSex: instance.PatientSex || null,
+      PatientDOB: formatDate(instance.PatientBirthDate) || null,
+    });
+    checkMixedPatients(instance.PatientID || null);
+  };
+
+  useEffect(() => {
+    const subscription = displaySetService.subscribe(
+      displaySetService.EVENTS.DISPLAY_SETS_ADDED,
+      () => updatePatientInfo()
+    );
+    return () => subscription.unsubscribe();
+  }, []);
+
+  useEffect(() => {
+    updatePatientInfo();
+  }, [displaySets]);
+
+  return { patientInfo, isMixedPatients };
+}
+
+export default usePatientInfo;